Dongyun Chen

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Name: 陈冬赟; DongYun Chen

Organization: Soochow University , China

Department: College of Chemistry

Title: Lecturer(PhD)

TOPICS

Material Chemistry

Inorganic Chemistry

Metal Organic Frameworks

Chemicals
References

Urchin-Inspired TiO2@MIL-101 Double-Shell Hollow Particles: Adsorption and Highly Efficient Photocatalytic Degradation of Hydrogen Sulfide

Co-reporter:Haibo Sheng, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, and Jianmei Lu

Chemistry of Materials July 11, 2017 Volume 29(Issue 13) pp:5612-5612

Publication Date(Web):June 12, 2017

DOI:10.1021/acs.chemmater.7b01243

Titanium dioxide (TiO2) is a commonly used photocatalysis for the oxidation of hydrogen sulfide (H2S). However, the low surface area and adsorption ability of TiO2 limit the photocatalytic decomposition rate. Here, a tunable metal–organic framework (MOF) coating is applied to hollow TiO2 nanoparticles using a versatile step-by-step self-assembly strategy. The hollow structure provides a high surface area, and the selected MIL-101 (Cr) MOF has a high and regenerable adsorption ability for H2S. The TiO2@MIL-101 double-shell hollow particles enable a catalytic cycle involving simultaneous adsorption and degradation of H2S, with considerably enhanced photocatalytic reaction rate. This work provides a method for improving photocatalytic performance through the design of hollow MOF-based materials that rationally combine the power of MOF and TiO2.

A novel strategy to immobilize bacteria on polymer particles for efficient adsorption and biodegradation of soluble organics

Co-reporter:Yahui Cai;Shun Yang;Najun Li;Qingfeng Xu;Hua Li;Jinghui He;Jianmei Lu

Nanoscale (2009-Present) 2017 vol. 9(Issue 32) pp:11530-11536

Publication Date(Web):2017/08/17

DOI:10.1039/C7NR02610B

A novel strategy was used to immobilize bacterial cells on the surface of functional polymer particles for the efficient adsorption and biodegradation of organics in wastewater. First, the bacterial cells were aggregated using a vinyl-containing pre-polymer, and the obtained bacteria–pre-polymer complex was then used as a particle stabilizer to construct a stable Pickering emulsion of functional cross-linking monomers and hydrophobic superparamagnetic iron oxide nanoparticles (the oil phase) in water. After polymerization, the bacteria–pre-polymer complex was covalently fixed to the surface of the polymer particles. Two species of bacterial cells (Pseudomonas putida andParacoccus denitrificans) were used as models to study their removal capacity for phenol and DMF, respectively. Batch experiments showed that the as-prepared magnetic bacteria–polymer (MPB) composites could efficiently remove organics from the aqueous solutions, and the encapsulated iron oxide nanoparticles enabled the MPB composites to be magnetically separated.

Nanofibrous metal–organic framework composite membrane for selective efficient oil/water emulsion separation

Co-reporter:Yahui Cai, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu

Journal of Membrane Science 2017 Volume 543(Volume 543) pp:

Publication Date(Web):1 December 2017

DOI:10.1016/j.memsci.2017.08.047

•Superoleophobicity under water and superhydrophobicity under oil membrane was developed for oil-water emulsion separation.•PAN@ZIF-8 composite membrane exhibits high gravity-driven water and oil flux and high separation efficiency.•The composite membrane is simple to apply, durable and suitable for large scale applications.•The preparation processes were simple and low-cost.Among the various environmental problems, that of water pollution is undoubtedly one of the most severe that mankind faces; this global challenge requires efficient separation of surfactant-stabilized oil/water emulsions to be solved. Here, a separation membrane with unique wettability is prepared by integrating polyacrylonitrile nanofibers with nanocrystalline zeolite imidazole framework (ZIF-8). The membrane shows prewetting-induced superoleophobicity under water and superhydrophobicity under oil. Surfactant-stabilized oil/water emulsions are effectively separated by the hierarchically nanostructured composite membrane. The hybrid membrane displays a high oil contact angle under water (159°) and high water contact angle under oil (155°), resulting in fast separation dynamics and high separation efficiency. This membrane represents a new approach to exploit multifunctional materials for water remediation.

Coral-inspired nanoscale design of porous SnS2 for photocatalytic reduction and removal of aqueous Cr (VI)

Co-reporter:Jiafu Qu, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu

Applied Catalysis B: Environmental 2017 Volume 207(Volume 207) pp:

Publication Date(Web):15 June 2017

DOI:10.1016/j.apcatb.2017.02.050

•A unique porous corallite-like nanocomposite was fabricated for catalytic reduction and removing water-soluble Cr ions.•The “corallite” exhibited high visible-light catalytic activity and high adsorption capacity under UV light irradiation.•The compounds on the surface of “corallite” can selectively chelate aqueous Cr (III) by exposing to ultraviolet light.•The nanocomposite can effectively reduce and remove aqueous Cr (VI) (less than 50 mg/L) with an efficiency of nearly 100%.Frequent industrial discharge of various contaminants such as heavy metals into water resources has caused severe environmental damage. In this study, a unique porous corallite-like nanocomposite (SPNH-MOSF@SnS2) was successfully fabricated via surface modification of visible-light-driven photocatalyst (SnS2) and chelating ligand (spirobenzopyran derivative, SPNH) on macroporous ordered siliceous foam (MOSF). In our approach, SnS2 was selected as the photocatalyst due to its high visible light induced photocatalytic activity. SPNH was modified because it could selectively chelate soluble Cr (III) when exposed to ultraviolet light. This unique nanocomposite could be used for highly efficient reduction and removal of hexavalent chromium [Cr (VI)] from wastewater, especially under the mildly acidic condition. The results indicate encouraging applications of this as-prepared new nanocomposite for treating Cr (VI) containing wastewater.Download high-res image (168KB)Download full-size imageSnS2 nanocrystals were successfully encapsulated in macroporous ordered siliceous foam decorated with spirobenzopyran derivative and employed for highly efficient photocatalytic reduction and removal of hexavalent chromium from water.

In situ fabrication of Bi2O2CO3/MoS2 on carbon nanofibers for efficient photocatalytic removal of NO under visible-light irradiation

Co-reporter:Jundie Hu, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu

Applied Catalysis B: Environmental 2017 Volume 217(Volume 217) pp:

Publication Date(Web):15 November 2017

DOI:10.1016/j.apcatb.2017.05.088

•A new nanocomposite photocatalyst Bi2O2CO3-MoS2-CNFs was fabricated successfully by an efficient method.•This new photocatalyst demonstrated highly efficient in NO removal at low concentration (600 ppb) under visible-light irradiation, and its maximum efficiency up to 68%.•The photocatalyst is good to recycling and multiple runs, and has potential value for industrial applications.A novel nanocomposite photocatalyst for NO removal, Bi2O2CO3-MoS2-CNFs, was fabricated by an efficient method. This new photocatalyst performed impressively in the removal of NO at low concentration (600 ppb), with a maximum efficiency of 68% under visible-light irradiation, superior to most other visible-light photocatalysts. Its high performance was ascribed to the introduction of carbon nanofibers as carriers, and MoS2, which enhanced the absorption of visible light and accelerated the separation and transfer of electrons and holes. Photocurrent tests and electrochemical impedance spectroscopy also demonstrated that Bi2O2CO3-MoS2-CNFs had a high efficiency of interfacial charge separation, which is critical to improving the photocatalytic activity. Moreover, the membrane of the photocatalyst was stable and recyclable after multiple runs. All of these factors demonstrate its potential application in the removal of NO from air.Download high-res image (143KB)Download full-size image

Dual-layer copper mesh for integrated oil-Water separation and water purification

Co-reporter:Haiguang Zhu, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu

Applied Catalysis B: Environmental 2017 Volume 200(Volume 200) pp:

Publication Date(Web):1 January 2017

DOI:10.1016/j.apcatb.2016.07.028

•Bifunctional mesh with both superhydrophobicity and photocatalytic ability was successfully prepared.•Separation of insoluble oil from the oil-water mixture.•Photodegradation of soluble organic pollutants for further water purification.One of the major environmental issues is water quality deterioration caused by the discharge of both insoluble and soluble organic pollutants, which affect human beings’ health enormously. Therefore, it is of great importance to develop a versatile material to remove the organic pollutants from water. However, such materials capable of both efficiently separating insoluble oil and organic solvent from water and photodegrading soluble organic pollutions are rare on the market. Here, we report a facile method to fabricate a dual-layer copper mesh (DCM) by overlaying a graphene oxide (GO)/AgBr-coated mesh onto an Ag-coated mesh. The key point in this study is to integrate the superhydrophobic Ag-coated mesh and photocatalytic GO/AgBr-coated mesh, resulting in the bifunctional DCM with both excellent oil/water separation performance and efficient photodegradation of soluble organic pollutants under visible light illumination. Meanwhile, it is worth mentioning that the fabrication process is simple and cost-effective without using any sophisticated equipment, which permits a scale-up of DCM for water purification. Hence, the bifunctional and easily prepared properties make it an ideal candidate for encouraging application in oil/water separation and water pollutants photodegradation.A dual-layer copper mesh consists of a superhydrophobic Ag-coated mesh and a photocatalytic GO/AgBr-coated mesh was fabricated for water purification via separation of insoluble oil from water and successively photodegradation of soluble organic dyes.Download high-res image (219KB)Download full-size image

Highly efficient simultaneous adsorption and biodegradation of a highly-concentrated anionic dye by a high-surface-area carbon-based biocomposite

Co-reporter:Yuan Zheng, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu

Chemosphere 2017 Volume 179(Volume 179) pp:

Publication Date(Web):1 July 2017

DOI:10.1016/j.chemosphere.2017.03.096

•Agricultural waste as an eco-friendly strategy for dye removal from wastewater.•Simultaneous chemical-physical activation technique promoted surface area.•MHSA-AC could adsorb AO10 effectively to protect bacteria from harm.•High-concentrated AO10 could be removed completely by SAB process.Mesoporous high-surface-area activated carbon (MHSA-AC), which has a honeycomb structure, was produced from coconut shells by simultaneous chemical and physical activation and used for the rapid adsorption of an anionic dye, namely acid orange 10 (AO10), from water. Owing to its porosity and high Brunauer–Emmett–Teller surface area (2283.91 m2g−1), MHSA-AC is a highly efficient adsorbent. It also has good biocompatibility and is a good immobilization carrier; the grooves on the MHSA-AC surface facilitate immobilization. Here, a new, highly efficient, and environmentally friendly simultaneous adsorption and biodegradation (SAB) process was developed. Highly concentrated AO10 (6000 mg L-1, 20 mL) was removed with an efficiency of 100% (pH = 7, 35 °C) by SAB using cells immobilized on MHSA-AC (500 mg). The immobilized cells were used directly, without pretreatment; the SAB process is therefore simple and has good potential for application in the treatment of dyes in industrial wastewater.Download high-res image (310KB)Download full-size image

Surface-Nanoengineered Bacteria for Efficient Local Enrichment and Biodegradation of Aqueous Organic Wastes: Using Phenol as a Model Compound

Co-reporter:Shun Yang;Najun Li;Qingfeng Xu;Hua Li;Jinghui He ;Jianmei Lu

Advanced Materials 2016 Volume 28( Issue 15) pp:2916-2922

Publication Date(Web):

DOI:10.1002/adma.201505493

Flexible Electrospun Carbon Nanofiber/Tin(IV) Sulfide Core/Sheath Membranes for Photocatalytically Treating Chromium(VI)-Containing Wastewater

Co-reporter:Yunlei Zhong, Xun Qiu, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, and Jianmei Lu

ACS Applied Materials & Interfaces 2016 Volume 8(Issue 42) pp:28671

Publication Date(Web):October 10, 2016

DOI:10.1021/acsami.6b10241

We report an efficient method for fabricating flexible membranes of electrospun carbon nanofiber/tin(IV) sulfide (CNF@SnS2) core/sheath fibers. CNF@SnS2 is a new photocatalytic material that can be used to treat wastewater containing high concentrations of hexavalent chromium (Cr(VI)). The hierarchical CNF@SnS2 core/sheath membranes have a three-dimensional macroporous architecture. This provides continuous channels for the rapid diffusion of photoelectrons generated by SnS2 nanoparticles under visible light irradiation. The visible light (λ > 400 nm) driven photocatalytic properties of CNF@SnS2 are evaluated by the reduction of water-soluble Cr(VI). CNF@SnS2 exhibits high visible light-driven photocatalytic activity because of its low band gap of 2.34 eV. Moreover, CNF@SnS2 exhibits good photocatalytic stability and excellent cycling stability. Under visible light irradiation, the optimized CNF@SnS2 membranes exhibit a high rate of degradation of 250 mg/L of aqueous Cr(VI) and can completely degrade the Cr(VI) within 90 min.Keywords: CNF@SnS2; electrospun carbon nanofiber; hexavalent chromium wastewater; nanofiber membrane; visible light-driven photocatalyst

A Robust Absorbent Material Based on Light-Responsive Superhydrophobic Melamine Sponge for Oil Recovery

Co-reporter:Haiguang Zhu;Shun Yang;Najun Li;Qingfeng Xu;Hua Li;Jinghui He ;Jianmei Lu

Advanced Materials Interfaces 2016 Volume 3( Issue 5) pp:

Publication Date(Web):

DOI:10.1002/admi.201500683

Advanced materials with intelligent switchable surfaces that can respond to external stimuli have encouraging application in oil/water separation and oil clean-up. Herein, a facile method has been demonstrated to prepare a robust and superhydrophobic sponge by integrating the melamine-formaldehyde (MF) sponge with light-responsive spiropyran derivative via a radical copolymerization process, which shows the light-controllable oil absorption and desorption property under light illumination. The key chemistry is that the MF sponge is first modified with vinyl for the copolymerization via a facile solution-immersion process. Afterward, light-responsive spiropyran methacrylate monomers are copolymerized with vinyl-modified MF sponges to fabricate polymer-MF sponge composites (denoted as SP-MF sponge), resulting in the wettability conversion from amphiphilic to superhydrophobic with a water contact angle of 155.5°. The superhydrophobic MF sponge shows excellent selectivity and high absorption capacity for a range of oils and organic solvents from 70 to 154 times its own weight. More importantly, since the hydrophobic polymer of the SP-MF sponge can be converted to hydrophilic under UV illumination, the wettability of SP-MF sponge will change to hydrophilic, resulting in the light-controlled oil desorption process. These findings offer a new responsive absorbent material and a new approach for oil recovery.

Graphene Foam with Switchable Oil Wettability for Oil and Organic Solvents Recovery

Co-reporter:Haiguang Zhu;Najun Li;Qingfeng Xu;Hua Li;Jinghui He ;Jianmei Lu

Advanced Functional Materials 2015 Volume 25( Issue 4) pp:597-605

Publication Date(Web):

DOI:10.1002/adfm.201403864

One of the most pervasive environmental issues is water contaminated with oil or organic solvents; this global challenge calls for emerging materials that could effectively separate oil or organic solvents from water. Here, such a material is presented by integrating 3D porous graphene foam (GF) with a smart pH-responsive surface, showing switchable superoleophilic and superoleophobic properties in response to the medium pH. The key chemistry applied in this study is to modify the 3D porous GF with an amphiphilic copolymer containing a block of poly(2-vinylpyridine) and polyhexadecyl acrylate (P2VP-b-PHA), resulting in a smart GF (ss-GF) with an either superoleophilic or superoleophobic surface at different medium pH. The as-designed ss-GF can effectively absorb oil or organic solvents from the aqueous media by using its superoleophilic surface at pH of 7.0, and it can also completely release the adsorbates when the pH is switched to 3.0 (and the surface of ss-GF is therefore shifted to superoleophobic); with a continuous operation of many cycles (e.g., >10). Furthermore, the as-designed ss-GF shows superior absorption capacity for oil and organic solvent, with a high capacity of ≈196 times of the weight relative to that of the pristine ss-GF. The present work suggests encouraging applications of the ss-GF to water–oil and water–organic solvent separation.