Co-reporter:Nannan Wang, Christopher J. Miller, Peng Wang, T. David Waite
Analytica Chimica Acta 2017 Volume 963(Volume 963) pp:
Publication Date(Web):22 April 2017
DOI:10.1016/j.aca.2017.02.033
•The AR/HRP method for H2O2 analysis widely used but species such as S(−II) interfere.•Interference overcome by modelling S(−II) and AR competition for intermediate oxidant.•The approach is generally applicable to any reduced entity that scavenges the oxidant.The Amplex Red/horseradish peroxidase (AR/HRP) assay for H2O2 is one of the most sensitive and simple approaches for H2O2 quantification, which is effected by measuring the highly-fluorescent resorufin formed from oxidation of AR by the oxidizing intermediates generated by reaction of HRP and H2O2. The direct reactions of S(−II) with both H2O2 and resorufin are too slow to be of relevance on analytical timescales, however, the reaction between S(−II) and the HRP/H2O2 oxidizing intermediates is rapid enough to compete with the desired reaction of these oxidizing intermediates with AR, suppressing formation of the resorufin analyte. As this mode of interference can be considered simply a competition between the AR reagent and S(−II) for the intermediate oxidizing species, a simple equation is derived in this work enabling one to correct for this interference and obtain a good estimate of the true H2O2 concentration after measuring the apparent H2O2 concentration and the S(−II) concentration. This mode of interference is general to any compound that can act as a HRP substrate even if not directly reactive with H2O2. As such, the approach described is widely applicable to many potential reducing interferents and opens up the use of the AR/HRP assay to a much wider range of conditions, as well as demonstrating the utility of explicitly considering the mechanism of the analytical process.Download high-res image (269KB)Download full-size image
Co-reporter:Shili Qin, Liqiang Su, Peng Wang and Yuan Gao
Analytical Methods 2015 vol. 7(Issue 20) pp:8704-8713
Publication Date(Web):25 Aug 2015
DOI:10.1039/C5AY01499A
Highly selective magnetic molecularly imprinted polymers (MMIPs) for the adsorption of sulfonamides (SAs) were prepared by surface imprinted technology using active Fe3O4–chitosan (Fe3O4–CS) as the core and a mixture of sulfamethazine (SMZ) and sulfamethoxazole (SMX) as mixed template molecules. The optimum crosslinker types and contents were evaluated based on the analysis of adsorption parameters (Q, Kd and k) and regeneration of the MMIPs. The structure, morphology, magnetism, thermostability, adsorption and recognition properties of the MMIPs were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA) and re-binding experiments, respectively. The results showed that the superparamagnetic particles with a homogeneous polymer film exhibited the maximum adsorption capacity (Q(SMX) = 4.32 mg g−1; Q(SMZ) = 4.13 mg g−1), good selective recognition of SAs (k(SMX) = 3.52; k(SMZ) = 3.83) and a fast adsorption rate (t = 9 min). Furthermore, molecularly imprinted polymers-magnetic dispersive solid-phase extraction (MIPs-MDSPE) coupled with a HPLC method was developed for the enrichment and determination of seven SAs in five different water samples, with recoveries and relative deviations (RSD) ranging from 85.02 to 102.98% and from 2.77 to 6.47%, respectively. SMX was detected in influent and effluent sewage samples, at concentrations of 112 and 64 ng L−1, respectively.
Co-reporter:Shili Qin;Liqiang Su;Sheng Deng
Journal of Applied Polymer Science 2015 Volume 132( Issue 8) pp:
Publication Date(Web):
DOI:10.1002/app.41491
ABSTRACT
Highly selective molecularly imprinted polymers (MIPs) that absorb sulfonamides (SAs) are prepared using two types of SAs as mixed templates, 2-vinylpyridine as the functional monomer and ethylene glycol dimethacrylate as the crosslinker. The optimum combination of the mixed templates, their adsorption effect and the imprinting mechanism are evaluated based on SPE recoveries of a family of analytes, equilibrium binding, BET surface area analysis and UV. The results indicate that the mixed templates not only optimize the cavities of the MIPs but also improve the MIPs selectivity and adsorption capacity for the target analytes in aqueous solution. Therefore, MIPs are used for the quantitative analysis of SAs in fish farming water using off-line SPE coupled to HPLC/DAD. The recovery and RSD were 84.16–101.19 and 1.98–7.10%, respectively. Four SAs analytes were detected in four types of water samples in the range of 8.49–74.60 ng L−1. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41491.
Co-reporter:Shijie Chen, Yingjie Li, Renjiang Lü, Jiping Jiang, Guangshan Zhang, and Peng Wang
Industrial & Engineering Chemistry Research 2014 Volume 53(Issue 26) pp:10775-10783
Publication Date(Web):2017-2-22
DOI:10.1021/ie403406w
Photocatalytic degradation of norfloxacin (NOR) (10 mg/L) was studied using tungsten bismuth loaded carbon iron complexes (C/Fe–Bi2WO6) under simulated solar light (SSL) irradiation in a cylindrical reactor. Three experimental parameters were chosen as independent variables: pH, C/Fe–Bi2WO6 concentration, and H2O2 concentration. A central composite experimental design (CCD) was used to establish a quadratic model as a functional relationship between the removal efficiency of NOR and the three independent variables. The optimal values of operating parameters under the related constraint conditions were found at a pH of 7.10, a C/Fe–Bi2WO6 concentration of 0.78 g/L, and a H2O2 concentration of 227 mg/L. Under the optimal conditions, the removal efficiency of NOR reached 91.66%. Regression analysis with an R2 value of 0.9728 indicated a good correlation between the experimental results and the predicted values.
Co-reporter:Guangshan Zhang, Wen Zhang, Daisuke Minakata, Yongsheng Chen, John Crittenden, Peng Wang
International Journal of Hydrogen Energy 2013 Volume 38(Issue 27) pp:11727-11736
Publication Date(Web):10 September 2013
DOI:10.1016/j.ijhydene.2013.06.140
•The solution pH significantly impacted the H2 production rate and quantum yield.•The stability of the photocatalyst was significantly affected by the solution pH.•The overall reaction pathways showed the strong dependence on the solution pH.•The photocatalytic H2 evolution must be sustained by enough H+ and electron donor.Much progress has been made in the development of novel visible light photocatalysts that split water into hydrogen (H2) and oxygen (O2). In this study, we examine the impact of initial solution pH on H2 production using an Ru/(CuAg)0.15In0.3Zn1.4S2 photocatalyst under visible light irradiation. In addition, the reaction mechanism was analyzed by examining the oxidation products of the electron donor (I‾) at different solution pH values. The results show that the initial pH significantly influenced the rate of H2 production and quantum yield (QY). In particular, the photocatalyst yielded the highest apparent QY (∼12.8%) at 420 ± 5 nm and highest H2 production rate (∼525 μmol h−1) at pH 2; with increasing pH, the H2 production and QY decreased significantly. The oxidation product of I‾ at pH < 6 was mainly I3‾, whereas at pH > 6 water splitting did not occur at all, so no IO3‾ or I2 were observed.
Co-reporter:Shili Qin, Sheng Deng, Liqiang Su and Peng Wang
Analytical Methods 2012 vol. 4(Issue 12) pp:4278-4283
Publication Date(Web):11 Oct 2012
DOI:10.1039/C2AY26091C
Group-selective molecularly imprinted polymers (MIPs) were synthesized from three kinds of sulfonamides (SAs) and three different functional monomers, with those employing sulfamerazine (SMR) and 2-vinylpyridine (2-Vpy) found to be optimal. The BET test, static adsorption and solid-phase extraction (SPE) recovery indicate that the MIPs exhibit strong affinity toward SAs in aqueous solution. Therefore they were used for the quantitative analysis of five SAs in wastewater from treatment plants by off-line SPE coupled to reversed-phase HPLC/DAD. The recoveries and relative standard deviation (RSD) of the molecularly imprinted solid-phase extraction (MISPE) method are 84.1–98.6% and 1.5 to 7.4% in wastewater. The limit of detection (LOD) and the enrichment factor (EF) for SAs were 4.09–19.29 ng L−1 and 411–506 respectively. Five SAs analytes were detected in influents, with residues still remaining in effluents in the range of 29.30–1389.80 ng L−1.
Co-reporter:Liang Guo;Ying Zhao
Frontiers of Environmental Science & Engineering 2012 Volume 6( Issue 2) pp:238-245
Publication Date(Web):2012 April
DOI:10.1007/s11783-011-0382-7
In this paper, an artificial neural network model was built to predict the Chemical Oxygen Demand (CODMn) measured by permanganate index in Songhua River. To enhance the prediction accuracy, principal factors were determined through the analysis of the weight relation between influencing factors and forecasting object using cluster analysis method, which optimized the topological structure of the prediction model input items of the artificial neural network. It was shown that application of the principal factors in water quality prediction model can improve its forecasting skill significantly through the comparison between results of prediction by artificial neural network and the measurements of the CODMn. This methodology is also applicable to various water quality prediction targets of other water bodies and it is valuable for theoretical study and practical application.
Co-reporter:Hai Lei Cao;Yuan Li
Macromolecular Research 2010 Volume 18( Issue 11) pp:1129-1132
Publication Date(Web):2010 November
DOI:10.1007/s13233-010-1113-9
Co-reporter:Hai Lei Cao;Wei Bo Yuan
Macromolecular Chemistry and Physics 2009 Volume 210( Issue 23) pp:
Publication Date(Web):
DOI:10.1002/macp.200900231
Co-reporter:Ying Min Zhang;Hai Fen Lei;Ning Han
Macromolecular Rapid Communications 2007 Volume 28(Issue 4) pp:417-421
Publication Date(Web):21 FEB 2007
DOI:10.1002/marc.200600668
D,L-Lactide with a yield of about 36% was synthesized from D,L-lactic acid by the addition of SnCl2 and Cat-A as catalyst under continuous microwave irradiation in less than 1 h. In order to gain a higher yield, the viscosity-average molecular weight of the oligomer was preferably over 3 000 g · mol−1, and the microwave power in the depolymerization process was chosen for 200 W with 100 g of D,L-lactic acid. On comparison with conventional heating in the same experimental conditions, no non-thermal effect of microwave irradiation was revealed.
Co-reporter:P. Wang;X. Z. Li;B. X. Zhao
Photochemistry and Photobiology 2007 Volume 83(Issue 3) pp:642-646
Publication Date(Web):14 MAR 2007
DOI:10.1562/2006-09-05-RA-1030
A new reactor system was designed for an integrated process involving photoelectrocatalytic oxidation (PECO) and electro-Fenton (E-Fenton) oxidation. Its efficiency was evaluated in terms of 2,4-dichlorophenol (2,4-DCP) degradation in aqueous solution. In this process, a TiO2 electrode and an iron (Fe) electrode were used as anodes in parallel, while graphite felt (GF) was used as a cathode. When an electrical current is applied between the anodes and the cathode, the iron anode can release Fe2+ and the GF cathode can generate H2O2 continuously in the reaction solution. Under UV-A illumination, while a H2O2-assisted PECO reaction occurs on the surface of the TiO2 photo anode, an E-Fenton reaction takes place in the solution. The experimental results demonstrated that 2,4-DCP degradation in aqueous solution was greatly enhanced because of the interaction between the two types of reactions. Moreover, the effect of pH as an important factor was investigated. It was found that the combined reaction becomes less pH sensitive than the typical E-Fenton reaction and may be suitable for application in a wide pH range.
Co-reporter:Qing-Zhu Zheng, Peng Wang, Ya-Nan Yang, De-Jie Cui
Journal of Membrane Science 2006 Volume 286(1–2) pp:7-11
Publication Date(Web):15 December 2006
DOI:10.1016/j.memsci.2006.09.033
In order to clarify the relationship between the porosity of membrane and the kinetics parameter of membrane formation (Da) in polysulfone (PSF) ultrafiltration membrane, phase-inversion process was used in PSF membrane preparation from PSF casting solution with poly(ethylene glycol) (PEG) or poly(vinyl pyrrolidone) (PVP) introduction. A new method used to calculate Da was founded and an equation of Da = d2/t was established on the basis of the relationship between wet membrane thickness and coagulation time. It was found that there was substantial relationship between Da and porosity in PSF ultrafiltration membrane, and that the linear relationship between Da and porosity in PSF ultrafiltration membrane could be described as P(%) = a + bDa.
Co-reporter:Zhao Bao-Xiu;Wang Peng;Zheng Tong;Chen Chun-yun;Shu Jing
Journal of Applied Polymer Science 2006 Volume 99(Issue 6) pp:2951-2956
Publication Date(Web):11 JAN 2006
DOI:10.1002/app.22986
The adsorbent resin was prepared by grafting copolymerization of acrylic acid and acrylamide onto cellulose under microwave irradiation, and was applied to adsorb copper ions from wastewater. The influences of adsorption time, resin particle size, pH values, and temperature of solution on its adsorption performance were investigated. At the optimal adsorption conditions, adsorption ratio could get to 99.2% and the adsorption capability reached 49.6 mg/g. Furthermore, adsorption theory model was based and study showed that the physical adsorption was dominating and it accorded to Freundlich isotherm model. XPS of adsorbent resin complex was tested, which ensured the chelating groups onto adsorbent surface. Adsorbent resin could be regenerated using 8% NH3·H2O, which had good regeneration effect, and experiment showed that adsorption ratio could still keep over 90% when resin was regenerated seven times. So, heavy metal-ions could be reclaimed from gel resin and the circulation of resources could be realized. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci, 2006
Co-reporter:Shu Jing;Wang Peng;Zheng Tong;Zhao Baoxiu
Journal of Applied Polymer Science 2006 Volume 100(Issue 3) pp:2244-2247
Publication Date(Web):17 FEB 2006
DOI:10.1002/app.22527
Poly(D,L-lactide) (PDLLA) was synthesized by microwave-irradiated ring-opening polymerization catalyzed by stannous octoate (Sn(Oct)2) under atmosphere. The effects of heating medium, monomer purity, catalyst concentration, microwave irradiation time, and vacuum level were discussed. Under the appropriate conditions such as carborundum (SiC) as heating-medium, 0.15% catalyst, lactide with purity above 99.9%, 450 W microwave power, 30 min irradiation time, and atmosphere, PDLLA with a viscosity–average molecular weight (Mη) over 2.0 × 105 and a yield over 85% was obtained. The dismission of vacuum to ring-opening polymerization of D,L-lactide (DLLA) under microwave irradiation simplified the process greatly. The temperature under microwave irradiation and conventional heating was compared. The largely enhanced ring-opening polymerization rate of DLLA under microwave irradiation was the coeffect of thermal effects and microwave effects. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2244–2247, 2006
Co-reporter:Wang Peng;Mao Gui-Jie;Meng Xiang-Sheng;Zhang Xing;Zheng Tong
Journal of Applied Polymer Science 2006 Volume 102(Issue 6) pp:5854-5860
Publication Date(Web):28 SEP 2006
DOI:10.1002/app.24947
Corn starch was crosslinked with sodium trimetaphosphate (STMP) in solid state under microwave irradiation to improve the degree of substitution (DS) and decrease the reaction time. The effects of modification factors on the crosslinking of starch were systematically studied. It was found that the microwave irradiation provided a convenient and efficient method to prepare crosslinked starch with sufficient DS. The DS value of crosslinked starches obtained by microwave irradiation was significantly improved and the reaction time was also dramatically decreased to achieve an appropriate DS value by microwave irradiation, when compared with using traditional method. The high microwave power provided faster reaction kinetics to obtain the desired DS value at an identical reaction condition. If the reaction temperature is lower than the decomposition temperature of crosslinked starch, the higher DS value can be achieved at the higher microwave power. It was detected that the DS data obtained by reacting intermittently was higher than those by reacting continuously. It was also noticed that DS data varied drastically with the increasing of the amount of STMP and sodium carbonate. The swelling ratio of crosslinked starch in water was lower than that of native starch because of the nongelatinization of highly crosslinked starch. SEM analysis indicated that the crosslinking of corn starch by microwave irradiation caused no significant changes in the microstructure of starch granules. Light microscope analysis also showed the uniformity of so-prepared crosslinked corn starch applying microwave irradiation. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5854–5860, 2006
Co-reporter:Qi Hu, Peng Wang, Jiping Jiang, Hongyu Pan, Da-Wen Gao
Journal of Environmental Chemical Engineering (June 2016) Volume 4(Issue 2) pp:2243-2249
Publication Date(Web):1 June 2016
DOI:10.1016/j.jece.2016.03.022
Pyromellitic dianhydride (PMDA) modified jute fiber was prepared for aniline adsorption from aqueous solution in a fixed-bed column. A series of column tests were performed to determine the breakthrough characteristics, by varying bed depths (12–48 mm), influent flow rates (10–20 mL/min) and initial concentrations (50–200 mg/L). Results illustrated an encouraging performance for aniline adsorption, with an adsorption capacity of 91.5 mg/g, at an influent concentration of 200 mg/L and adsorbent bed depth of 24 mm. Dynamic adsorption behavior was satisfactory described by Thomas, Bed Depth Service Time (BDST) and Yoon-Nelson models. Dynamic modeling analysis revealed that the best predictions of breakthrough curves were obtained with the BDST model. The exhausted biosorbent could get an effective desorption with 0.5 M hydrochloric acid solution. After three regeneration cycles, above 95% adsorption capacity of the biosorbent was maintained. The findings reveal that the modified jute fiber is a potential adsorbent for aniline pollution remediation.
Co-reporter:Qiao Wang, Guang-shan Zhang, Zhan-shuang Li, Sheng Deng, Han Chen, Peng Wang
Desalination (3 November 2014) Volume 352() pp:38-44
Publication Date(Web):3 November 2014
DOI:10.1016/j.desal.2014.08.001
•We added TiO2 sol instead of TiO2 nano-particles to make PSF/TiO2 hybrid membrane.•The polymerization reaction happened on the surface of PSF/TiO2 hybrid membrane.•The addition of TiO2 sol changed the salt rejection slightly.•The water flux increased three times after adding proper TiO2 sol.The TiO2 sol was added in the polysulfone (PSF) casting membrane solution to prepare polysulfone/titania hybrid membrane in this work. Then the polypiperazine–amide composite nanofiltration (NF) membranes were prepared on PSF/TiO2 hybrid membranes by interfacial polymerization. Piperazine and trimesoyl chloride were used as monomers in aqueous phase and organic phase, respectively. Different preparation conditions affecting the separation performances of NF membrane were discussed, including TiO2 sol concentration, piperazine concentration, trimesoyl chloride concentration, and reaction time. The chemical structure characterizations of polyamide composite membrane were tested by attenuated total reflectance infrared (ATR-IR). The surface images and cross sections were observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The addition of TiO2 sol changed the salt rejection slightly, but the water flux was three times than that of the polyamide membrane on the PSF support membrane. The polyamide NF membrane prepared under the optimum condition exhibited Na2SO4 rejection of 96.94% and water flux of 12.84 L m− 2 h− 1. According to the intercepting experiments of polyethylene glycols, the molecular weight cut-off (MWCO) of the resulting membrane was under 600 Da.
Co-reporter:Bao-xiu ZHAO, Xiang-zhong LI, Peng WANG
Journal of Environmental Sciences (2007) Volume 19(Issue 8) pp:1020-1024
Publication Date(Web):1 January 2007
DOI:10.1016/S1001-0742(07)60165-X
AbstractDegradation of 2,4-dichlorophenol (2,4-DCP) was studied in a novel three-electrode photoelectrocatalytic (PEC) integrative oxidation process, and the factors influencing the degradation rate, such as applied current, flow speed of O2, pH, adscititious voltage and initial 2,4-DCP concentration were investigated and optimized. H2O2 was produced nearby cathode and Fe2+ continuously generated from Fe anode in solution when current and O2 were applied, so, main reactions, H2O2-assisted TiO2 PEC oxidation and E-Fenton reaction, occurred during degradation of 2,4-DCP in this integrative system. The degradation ratio of 2,4-DCP was 93% in this integrative oxidation process, while it was only 31% in E-Fenton process and 46% in H2O2-assisted TiO2 PEC process. So, it revealed that the degradation of 2,4-DCP was improved greatly by photoelectrical cooperation effect. By the investigation of pH, it showed that this integrative process could work well in a wide pH range from pH 3 to pH 9
Co-reporter:Shanshan Zhao, Peng Wang, Ce Wang, Xin Sun, Linhuan Zhang
Desalination (1 August 2012) Volume 299() pp:35-43
Publication Date(Web):1 August 2012
DOI:10.1016/j.desal.2012.05.013
Poly (phthalazine ether sulfone ketone) (PPESK)/TiO2 organic–inorganic composite ultrafiltration (UF) membranes with enhanced performance for high temperature condensed water treatment were prepared using a phase-inversion method. The effects of TiO2 concentration on the membrane morphologies, physic-chemical properties, membrane permeability and antifouling performance were investigated and discussed. The SEM result reveals that the penetrated finger-like structure in sublayer is suppressed, and sponge-like structure begins to be developed. The mechanical strength and thermal stability of composite membrane are improved due to the existence of hydrogen bond between TiO2 and polymer. The permeate flux is also enlarged due to the improved hydrophilicity and porosity. Compared with neat PPESK membrane, the composite membranes present improved antifouling properties, showing lower filtration resistances, MFI values and better flux recover property during high temperature condensed water treatment. The optimal addition amount of TiO2 is 2 wt.%. The high temperature condensed water with excess oil and iron can be treated efficiently using PPESK/TiO2 composite membrane. The turbidity of feed solution is almost removed. The oil and iron concentrations in permeate solution are 0.89 mg/L and 26.4 μg/L which meet the Quality Criterion of Water and Steam for Steam Power Equipment in China.Highlights► PPESK/TiO2 nanocomposite UF membranes were prepared by phase-inversion method. ► The mechanical strength, thermal stability and hydrophilicity were improved. ► The composite membranes showed better permeability and antifouling properties. ► The excess oil and iron in high temperature condensed water were removed efficiently. ► Reclaiming high temperature condensed water can save energy and realize water cycle.
Co-reporter:
Analytical Methods (2009-Present) 2015 - vol. 7(Issue 20) pp:NaN8713-8713
Publication Date(Web):2015/08/25
DOI:10.1039/C5AY01499A
Highly selective magnetic molecularly imprinted polymers (MMIPs) for the adsorption of sulfonamides (SAs) were prepared by surface imprinted technology using active Fe3O4–chitosan (Fe3O4–CS) as the core and a mixture of sulfamethazine (SMZ) and sulfamethoxazole (SMX) as mixed template molecules. The optimum crosslinker types and contents were evaluated based on the analysis of adsorption parameters (Q, Kd and k) and regeneration of the MMIPs. The structure, morphology, magnetism, thermostability, adsorption and recognition properties of the MMIPs were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA) and re-binding experiments, respectively. The results showed that the superparamagnetic particles with a homogeneous polymer film exhibited the maximum adsorption capacity (Q(SMX) = 4.32 mg g−1; Q(SMZ) = 4.13 mg g−1), good selective recognition of SAs (k(SMX) = 3.52; k(SMZ) = 3.83) and a fast adsorption rate (t = 9 min). Furthermore, molecularly imprinted polymers-magnetic dispersive solid-phase extraction (MIPs-MDSPE) coupled with a HPLC method was developed for the enrichment and determination of seven SAs in five different water samples, with recoveries and relative deviations (RSD) ranging from 85.02 to 102.98% and from 2.77 to 6.47%, respectively. SMX was detected in influent and effluent sewage samples, at concentrations of 112 and 64 ng L−1, respectively.
Co-reporter:Shili Qin, Sheng Deng, Liqiang Su and Peng Wang
Analytical Methods (2009-Present) 2012 - vol. 4(Issue 12) pp:
Publication Date(Web):
DOI:10.1039/C2AY26091C
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