Co-reporter:Yingqiao Xiang;Yingying Li;Xintong Zhang;Annan Zhou;Nan Jing
RSC Advances (2011-Present) 2017 vol. 7(Issue 50) pp:31619-31627
Publication Date(Web):2017/06/16
DOI:10.1039/C7RA05281B
A series of CuxO–TiO2 hollow nanospherical composites with different mass percents of copper were prepared by an impregnation method, and the TiO2 hollow nanospheres were prepared by hydrolysis of tetraethoxy titanium on the surface of spherical SiO2 nanoparticles and corrosion of SiO2 in NaOH solution. CuxO–TiO2 hollow nanospheres displayed higher photocatalytic activities towards acetaldehyde degradation to CO2 than TiO2@SiO2 nanospheres and TiO2 hollow nanospheres under UV and visible-light irradiation due to the narrowed band gap of TiO2 and enhanced charge separation after copper was introduced. In particular, the CuxO–TiO2 hollow nanospheres show high catalytic activities in degradation under visible-light irradiation.
Co-reporter:Annan Zhou;Yuejuan Zhang;Yasai Shi
RSC Advances (2011-Present) 2017 vol. 7(Issue 88) pp:55866-55873
Publication Date(Web):2017/12/07
DOI:10.1039/C7RA11089H
Three new kinds of composite metallocene catalyst, Cp2Zr@Gly, Cp2Zr@ZrGp and Cp2Zr@EXZrGP, for ethylene polymerization were synthesized based on matrixes of glyphosate (Gly), layered zirconium glyphosate (ZrGP) and exfoliated zirconium glyphosate (EXZrGP), and their catalytic activity in ethylene polymerization was studied. The catalytic activities of Cp2Zr@Gly, Cp2Zr@ZrGp and Cp2Zr@EXZrGP are 3.8 × 105, 3.3 × 105 and 4.8 × 105 gPE per molZr per h per bar at a temperature of 60 °C and after a time of 1.0 h, higher than that of the catalyst Cp2ZrCl2@SiO2 (2.3 × 105 gPE per molZr per h per bar), which is now used in industry. The catalytic activities of the three new catalysts are also higher than that of the catalyst Cp2ZrCl2 (3.0 × 105 gPE per molZr per h per bar) under the same conditions. Exfoliation of the activity centers from the support and reactor fouling phenomena were all found to be avoided during the course of the polymerization.
Co-reporter:Yasai Shi, Yuan Yuan, Qinghong Xu, Jianjun Yi
Applied Surface Science 2016 Volume 383() pp:126-132
Publication Date(Web):15 October 2016
DOI:10.1016/j.apsusc.2016.04.123
Highlights
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A series of heterogeneous catalysts were synthesized by loading metallocenes on surface of α-Ti(HPO4)2.
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Composite catalysts were found to have high catalytic activities in ethylene and propylene polymerizations.
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Polymers produced have higher molecular weights and narrow distributions.
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Research offers an important method to synthesized high activity catalyst.
Co-reporter:Tiantian Li;Yuan Yuan;Yingqiao Xiang
Chemical Research in Chinese Universities 2016 Volume 32( Issue 3) pp:334-337
Publication Date(Web):2016 June
DOI:10.1007/s40242-016-5398-x
A novel hybrid material with microporous structure was fabricated from SBA-15 with mesopores via silane modification and hydrolysis. Two kinds of pores with diameters of 6.5 and 1.9 nm were found in the hybrid material. Compared to that of SBA-15, the surface area of the hybrid material increased from 395.9 m2/g to 667.4 m2/g while its porous volume decreased. The new hybrid material was found to have high efficiency in removing NaCl from solution, and the maximum adsorption capacity of it was ca. 517.5 mg/g.
Co-reporter:Lotfia El Majdoub, Yasai Shi, Yuan Yuan, Annan Zhou, Abubaker Abutartour, Qinghong Xu
Applied Surface Science 2015 Volume 353() pp:376-381
Publication Date(Web):30 October 2015
DOI:10.1016/j.apsusc.2015.06.091
Highlights
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Metallocene was bridged on surface of silica gel.
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Composite catalyst was found to have high catalytic activities.
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Polymers produced have higher molecular weight.
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Research offers an important method to synthesized high activity catalyst.
Co-reporter:Abubaker Abutartour, Yunjie Jia, Lotfia El Majdoub, Qinghong Xu
Microporous and Mesoporous Materials 2014 Volume 196() pp:1-7
Publication Date(Web):15 September 2014
DOI:10.1016/j.micromeso.2014.04.054
•A new hierarchical porous zirconium phosphate membrane was prepared.•The porous structures were found to be bridged and limited by edge of (–Si–O–)n.•The porous membrane has a high adsorption efficiency on Cu2+ ions.A hierarchical porous zirconium phosphate membrane was prepared from bis(hexamethylenetriaminepenta(methylenephosphonic acid)), ZrOCl2·8H2O, SiF4 and hexadecyl trimethyl ammonium bromide. The membrane contains macropores of 200 nm in diameter, and mesopores of 19.2 nm in diameter. The membranes pores were bridged and limited by (–Si–O–)n edges. The porous membrane exhibited high efficiency in removing Pb2+ and Cu2+ from wastewater.Graphical abstract
Co-reporter:Lijun Dong, Chunling Ge, Peiyong Qin, Yan Chen, Qinghong Xu
Solid State Sciences 2014 Volume 31() pp:8-15
Publication Date(Web):May 2014
DOI:10.1016/j.solidstatesciences.2014.02.006
•Organic part in LDHs improves immobilization efficiency and activity of lipase.•Positive charge in LDHs is found to be beneficial to enzyme immobilization.•The immobilized enzyme has a wider pH range and a better thermostability in reaction.In this study, MgAl-LDHs (layered double hydroxides) intercalated with sodium dodecyl sulfate and outside surface modified with (3-aminopropyl)triethoxysilane (KH550) were prepared. The existence of organic part in LDHs improved immobilization efficiency and activity recovery of candida lipolytic lipase loaded. Also the positive charge in framework of LDHs was found to be beneficial to the enzyme immobilization. An immobilization efficiency of 56.4% and an activity recovery over 69.2% of the enzyme were obtained after it was loaded on the intercalated and modified LDHs, and catalytic activity of the immobilization can be kept at least five times. Moreover, the immobilized enzyme was found to have higher temperature resistance, wider pH value and better thermostability in reactive activity.
Co-reporter:Yan Chen, Nili Li, Shijing Mo, and Qinghong Xu
Industrial & Engineering Chemistry Research 2013 Volume 52(Issue 46) pp:16190-16196
Publication Date(Web):October 25, 2013
DOI:10.1021/ie402106a
In this paper, a new layered material zirconium[(3-ethylsulfanyl)–propyl]–phosphonate (noted as ZEPP) was synthesized via the reaction between [(3-ethylsulfanyl)–propyl]–phosphonate and ZrOCl2. The synthesized material was found to have spherical morphology with cavity and folded blades composited the spheres. Existence of nonpolar organic group (−CH2CH2CH2SCH2CH3) in framework of the material and surface roughness make the material, without modification by any low-surface-energy reagent, has super hydrophobicity property. Water contact angle (CA) on pressing plate of the sample is about 152°, larger than other zirconium phosphonates reported.
Co-reporter:Shijing Mo, Xiuqiao Zhao, Yan Chen, Liang Liu, Ruiwei Wang, Qinghong Xu
Materials Chemistry and Physics 2013 Volume 140(Issue 1) pp:228-235
Publication Date(Web):15 June 2013
DOI:10.1016/j.matchemphys.2013.03.026
•A new organic–inorganic hybrid zirconium phosphonate with window type porous structure.•Coordination groups exist in the wall of the pores.•The material can be used as catalyst to oxidation of formaldehyde after Fe3+ intercalated.An organic–inorganic hybrid zirconium phosphonate (noted as ZrNCP) with window type porous structure was synthesized by using β–alanine–N,N-dimethylidenephosphonic acid and zirconium dichloride oxide octahydrate. The sample possesses regular flake morphology, and these flakes have porous framework structure, which were characterized by SEM, HRTEM, N2 sorption, XRD, TGA–DSC, elemental analysis, XPS, and FT-IR spectroscopy techniques. The as-prepared ZrNCP can be used as catalyst to oxidation of formaldehyde after Fe3+ was intercalated and coordinated with nitrogen and carbonyl groups inside the porous walls of ZrNCP. 90.1% of oxidized efficiency was obtained when the catalyst was added into formaldehyde solution (40% water solution) at 80 °C.A new inorganic–organic hybrid zirconium phosphonate (noted as ZrNCP) with window type porous structure was synthesized. The material possesses regular flake morphology, and these flakes have porous framework structure. Research results indicate that the product can be used as catalyst to formaldehyde's oxidation after Fe3+ intercalated and coordinated with nitrogen and carbonyl groups in the pores.
Co-reporter:Yunjie Jia, Yuejuan Zhang, Ruiwei Wang, Jianjun Yi, Xu Feng, and Qinghong Xu
Industrial & Engineering Chemistry Research 2012 Volume 51(Issue 38) pp:12266-12273
Publication Date(Web):September 1, 2012
DOI:10.1021/ie300253z
A new kind of inorganic–organic hybrid zirconium phosphonate material (NTAZP) with mesoporous structure was synthesized using nitrilotris(methylene)-triphosphonic acid (ATMP) and zirconium dichloride oxide octahydrate. The sample possesses a spherical morphology, and the spheres are composed of lobular lamellae. The lobular lamellae have the structure of a worm-like mesoporous (about 2.7 nm) framework and a high surface area (about 160.4 m2/g), which were characterized by SEM, TEM, N2 sorption, XRD, TG-DTA, elemental analysis, TOC (total organic carbon), XPS, and FT-IR spectroscopy techniques. The as-prepared NTAZP was used as adsorbent for the efficient removal of heavy metal ions (e.g., Pb2+, Cu2+, and Cd2+). Our results indicate that the material has good prospects for application as an adsorbent in wastewater processing.
Co-reporter:Yunjie Jia, Yuejuan Zhang, Runwei Wang, Faying Fan, Qinghong Xu
Applied Surface Science 2012 Volume 258(Issue 7) pp:2551-2561
Publication Date(Web):15 January 2012
DOI:10.1016/j.apsusc.2011.10.091
Abstract
A new adsorbent named zirconium glyphosate [Zr(O3PCH2NHCH2COOH)2·0.5H2O, denoted as ZrGP] and its selective adsorptions to Pb2+, Cd2+, Mg2+ and Ca2+ ions in water were reported in this paper. Compared to other zirconium adsorbents, such as zirconium phosphate [Zr(HPO4)2], ZrGP exhibited highly selective adsorption to Pb2+ in solution which contained Pb2+, Cd2+, Mg2+ and Ca2+ ions. The loaded ZrGP with metallic ions can be efficaciously regenerated by aqueous solution of HCl (1.0 M) without any noticeable capacity loss, and almost all of it can be reused and recycled. The memory effect on structural regeneration of ZrGP was also found when Mg2+ and Ca2+ were adsorbed. To be specific, the structure of ZrGP was destroyed due to adsorbing these two ions, but it could be regenerated after the loaded materials were dipped in HCl solution (1.0 M) for several minutes to remove metallic ions.
Co-reporter:Yuejuan Zhang, Jianjun Yi, Qinghong Xu
Solid State Sciences 2011 Volume 13(Issue 1) pp:54-58
Publication Date(Web):January 2011
DOI:10.1016/j.solidstatesciences.2010.10.008
In our previous work [22], a kind of layered compound of zirconium phosphate–glyphosate (ZrGP) was synthesized. Its large surface area (445 m2/g) indicates this compound has possible application in adsorptions. In this paper, adsorption to formaldehyde in ZrGP and mechanisms of the adsorption were studied carefully. Balance time of adsorption (about 6 h) and largest adsorbed amount (7.8%) were found when adsorption temperature was at 40 °C and pH value of adsorption environment was about 3.0. H-bonds were found existing between molecules of formaldehyde and ZrGP, and formaldehyde molecules could exist in ZrGP stably.
Co-reporter:Xuemei Ji, Yao Liu, Minglei Li, David G. Evans, Qinghong Xu
Solid State Sciences 2011 Volume 13(Issue 2) pp:404-408
Publication Date(Web):February 2011
DOI:10.1016/j.solidstatesciences.2010.12.001
A new method to synthesize mesoporous Co-spinel ferrites is reported. Co2+Fe2+Fe3+-CO32−-layered double hydroxides (LDHs) were synthesized by coprecipitation in the presence of porous degreased popped corn and became adsorbed on the pore walls of the popped corn via hydrogen bonding. Mesoporous Co-spinel ferrites with pore sizes ranging from 2.7 nm to 4.2 nm were obtained by calcination of the Co2+Fe2+Fe3+-CO32−-LDH/popped corn assembly at 900 °C. Transmission electron microscopy (TEM) images showed that the formation of pores is related to diffusion and egress of CO2 which was formed during the calcination process. The product is composed of a large number of nanoparticles, and has good soft magnetic properties. This new method is expected to be applicable to the synthesis of other porous materials.
Co-reporter:Yaqing Zhang, Minglei Li, Xuemei Ji, Qinghong Xu
Solid State Sciences 2010 Volume 12(Issue 3) pp:361-366
Publication Date(Web):March 2010
DOI:10.1016/j.solidstatesciences.2009.11.014
A series of new organic-modified zirconium glyphosate compounds were synthesized based on the reactions between esterified glyphosates and ZrOCl2. FT-IR spectra, solid-state 31P MAS NMR and elementary analysis proved the formation of these new compounds. Powder X-ray diffraction (PXRD) patterns and transmission electron microscope (TEM) images proved these compounds had lamellar structures. Scanning electronic microscope (SEM) images showed that solvents used in synthesis had great influence on the morphologies of products. Water contact angle measurements showed that the hydrophobic property of the products was a function of the number of carbon in esterified glyphosates, increased from 0° of zirconium glyphosate to 133° of dodecyl zirconium glyphosate. The present study offered a new route to synthesize organic-modified α-Zr(HPO4)2·H2O (α-ZrP) materials with various morphology and controllable hydrophobic property.Series of new organic-modified zirconium glyphosate compounds were synthesized. Research results proved that these compounds had lamellar structures and solvents used in synthesis had great influence on morphologies of the products. Water contact angle measurements showed that hydrophobic property of the products was a function of the number of carbon in esterified glyphosates.
Co-reporter:Qinghong Xu, Yaqing Zhang, Jianjun Yi, Yuan Yuan, Samawar Mansur
Microporous and Mesoporous Materials 2009 Volume 119(1–3) pp:68-74
Publication Date(Web):1 March 2009
DOI:10.1016/j.micromeso.2008.09.043
A series of layered compounds of zirconium glyphosate and zirconium phosphate–glyphosates were synthesized with ZrOCl2, N-(phosphonomethyl)glycine and H3PO4 for the first time. It was found that the morphologies of zirconium phosphate–glyphosates had a strong variational rule from hexagon to sphere and sphere to lamella when nH3PO4/nGlyphosatenH3PO4/nGlyphosate changed from ∞ to 0, and also it was found that the product of zirconium glyphosate could be decomposed gradually in basic condition with pH value of lye increased. A monochromatic body of ZrGPEu under illumination of UV light was obtained by Eu3+ exchanged and coordinated with imido and carbonyl groups in the gallery of the layers.
Co-reporter:Xuemei Ji, Minglei Li, Yuxue Zhao, Yabo Wei, Qinghong Xu
Solid State Sciences 2009 Volume 11(Issue 6) pp:1170-1175
Publication Date(Web):June 2009
DOI:10.1016/j.solidstatesciences.2009.02.020
A composite electrode of Ni-ferrite/TiOx/Si(111) was synthesized by grafting Ni2+Fe2+Fe3+–LDH–TiCl3 (LDH: Layered Double Hydroxides) on n-Si(111) surface and calcined under 1100 °C. Photoelectric research results indicated that the electrode had good photovoltaic effects in an electrolyte solution containing 7.6 M HI and 0.05 M I2, while platinum plate was used as counter-electrode. The observed photo-voltages (Upv) and photocurrent densities (jpc) of the electrode were at −0.75 V and 5.35 mA/cm2, respectively. Compared with electrodes of oxidized n-Si(111) crystal and n-Si(111) wafer covered by Ni-ferrites, jpc of the electrode Ni-ferrite/TiOx/Si(111) was increased greatly.Ni2+Fe2+Fe3+–LDH–TiCl3 was grafted on n-Si(111) surface in bond-bridge of –(TiO)x–, and a composite electrode of Ni-ferrite/Si was obtained by calcinations of the corresponding LDH/Si assembly. Research results show that the composite electrode has good photovoltaic effects in 7.6 M HI/0.05 M I2 solution.
Co-reporter:Qinghong Xu, Yabo Wei, Yao Liu, Xuemei Ji, Lan Yang, Mingguang Gu
Solid State Sciences 2009 Volume 11(Issue 2) pp:472-478
Publication Date(Web):February 2009
DOI:10.1016/j.solidstatesciences.2008.07.004
Mg/Fe spinel ferrite nanoparticles were prepared by aging Mg2+/Fe2+/Fe3+-LDH (layered double hydroxides) suspension at temperature below 100 °C. The yield of Mg/Fe spinel ferrite nanoparticles was dependent on the aging temperature and the molar ratio of ferrous ions in the LDH precursors. It was found that the majority of iron atoms was assembled into the lattice of spinel ferrite when the LDH precursors were aged at 95 °C for 18 h, and the formation of Mg/Fe spinel ferrite was favored with a higher molar ratio of ferrous ion in the LDH precursors. To the best knowledge of us, it is the first report on preparation of spinel ferrite under such a mild condition of below 100 °C from Mg2+/Fe2+/Fe3+-LDH microcrystallites.Mg/Fe spinel ferrite nanoparticle was synthesized from LDH microcrystallites under 100 °C in open air. Results indicated that Mg/Fe spinel ferrite was formed with the aged temperature going up and the content of spinel ferrite in the product was increased with the Fe2+ increase in the original reactive mixtures.
Co-reporter:Qinghong Xu, Yuxue Zhao, Yabo Wei, Wensheng Yang, Feng Li, Mingguang Gu
Solid State Sciences 2008 Volume 10(Issue 3) pp:337-345
Publication Date(Web):March 2008
DOI:10.1016/j.solidstatesciences.2007.09.024
A series of Ni/Fe spinel ferrite overlays with different contents of spinel ferrite were prepared on n-silicon (111) wafers by calcination of Ni2+/Fe2+/Fe3+-LDHs carbonate precursors assembled on n-Si (111) wafers at 900 °C. The spinel ferrite overlay was found to improve the photoelectric properties of the silicon crystalline in terms of photovoltage and photocurrent in an electrolyte solution containing 7.6 M HI and 0.05 M I2. The observed photovoltages (Upv) and photocurrent densities (jpc) of the composite electrodes were enhanced with an increase of the content of spinel ferrite in the overlay.A series of n-Si (111) electrodes covered by spinel ferrites with different mole ratios of Ni/Fe and deposited by platinum cluster particles are synthesized. Results show that the photovoltage (Upv) and photocurrent density (jpc) of the composite electrodes (in 7.6 M HI/0.05 M I2 solutions as electrolyte) have strong changeable rules with different contents of spinel ferrites and the existent state of spinel ferrites.
Co-reporter:Qinghong Xu, Yuan Yuan, Jianjun Yi, Chenglin Ma
Solid State Sciences 2007 Volume 9(Issue 8) pp:732-736
Publication Date(Web):August 2007
DOI:10.1016/j.solidstatesciences.2007.05.005
A kind of macroscopic fiber of α-Zr(C6H5PO3)2 with diameter in millimeter scale and length in centimeter is synthesized by the method of infiltration–diffusion in this paper. Compared to the routine method [Q.H. Xu, L.S. Fu, L.S. Li, H.J. Zhang, R.R. Xu, J. Mater. Chem. 10 (2000) 2532], no HF was used in the synthesis and the SEM (scanning electronic microscopy) image indicates that these fibers have tubular structures which composed of flakes overlapped with each other vertically to the growth direction of the fiber. Powder X-ray diffraction (PXRD) proves that the walls of the tubes are composed of α-Zr(C6H5PO3)2 (α-ZrBP). As we know, it is the first report on synthesis of fiber-tube to α-ZrBP. A kind of macroscopic fiber of α-ZrBP with diameter in micrometer scale and length in centimeter is first synthesized by the method of infiltration–diffusion in this paper. SEM image indicates that the fibers have tube structures and the walls of the tubes are composed of the flakes of α-ZrBP overlapped with each other vertically to the growth direction of the fiber.
Co-reporter:Q.H. Xu, Y.X. Zhao, F. Huang, Z.Q. Zhang, Y.B. Wei
Surface Science 2007 Volume 601(Issue 7) pp:1709-1715
Publication Date(Web):1 April 2007
DOI:10.1016/j.susc.2007.01.043
