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Tailoring polymeric composite gel beads-encapsulated microorganism for efficient degradation of phenolic compounds

Chinese Journal of Chemical Engineering 2021年第4期34卷 301-306页

作者： Xueping Liu Ping Xue Feng Jia Dongya Qiu Keren Shi Weiwei Zhang State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

Phenol and its derivatives are highly toxic pollutants in industrial wastewater for the ecological environments,so there is essential attention to develop effective means of removing these harmful substances from *** this work,the microorganism was immobilized into polymeric composite gel beads prepared by the effective recombination of natural abundant chitosan(CS)and industrial polyvinyl alcohol(PVA)for treating phenolic *** degradation rate of 99.5%can be achieved to treat 100 mg·L^(1)of phenol at 30℃using the fresh resultant immobilized microorganism,where only 21.1%degradation rate was obtained by the free microorganism under the identical *** recycling experiments of repeated 90 times to treat 100 mg·L^(1)of phenol displayed that the degradation rate of phenol was stable to 99%with the appearance of beads unchanged significantly,indicating the immobilized microorganism possessed excellent operating ***,while the phenol derivatives of 100 mg·L^(1)were treated catalytically including pmethylphenol,catechol,and oaminophenol for 24 h by the immobilized microorganism,the degradation rates were all above 95%.The immobilized microorganism into PVACS polymeric composite with excellent operating stability and degradation activity would provide a feasible solution for treating phenolic compounds in water in industrial applications.

关键词： polymeric composite Immobilization Biocatalysis Phenolic compounds Degradation Reusability

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Dynamic Mechanical Behavior of a Novel polymeric composite Damping Material

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Chinese Chemical Letters 2005年第11期16卷 1527-1530页

作者： Cheng ZHANG Jiang Feng SHENG Chun An MA State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology Zhejiang University of Technology Hangzhou 310032

The dynamic mechanical behavior of a novel polymeric composite damping material has been investigated in this article. The composite consists of chlorinated polyethylene （CPE）, N,N-dicyclohexyl-2-benzothiazolylsufenamide （DZ）, 4,4＇-thio-bis（3-methyl-6-tert-buthylphenol）（BPSR） and vapor-grown carbon fiber （VGCF）. It is found that either the position or the intensity of damping peak can be controlled by changing the composition of CPE/DZ/BPSR composite. Within a certain composition region, damping peak maximum depends on CPE/DZ ratio, whereas damping peak position is controlled by BPSR content. Moreover, the improvement of storage modulus can be achieved by incorporation of VGCF. These results may imply that a damping material possessing both good damping properties and high strength can be designed and obtained.

关键词： Dynamic mechanical behavior polymeric composite damping material.

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Adhesion Characteristics of a Novel Synthetic Polydimethylsiloxane for Bionic Adhesive Pads

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Journal of Bionic Engineering 2014年第3期11卷 371-377页

作者： Qingsong He Min Yu Yang Li Xinlong Chen Hao Zhang Ling Gong Zhendong Dai Institute of Bioinspired Structure and Surface Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 P. R. China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 P. R. China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 P. R. China Department of Mechanical Engineering Carnegie Mellon University Pittsburgh 5000 USA

Materials with appropriate adhesive properties are suitable for the fabrication of bionic adhesive pads. In this study, a novel polydimethylsiloxane （PDMS） material enhanced with two types of crosslinkers, carbon nanotubes and graphene sheets, was fabricated. The Contact Angle （CA） and cross-sectional morphology of the new material were investigated and observed using a CA meter and Scanning Electron Microscopy （SEM）, respectively. CA measurements indicate that the surface energy of the novel material is twice that of the common PDMS material. SEM observations show that carbon nanotubes and graphene sheets are well dispersed in the polymer, a feature that improves the mechanical properties of the new material. The adhesive performance of this novel composite was tested on an in-house fabricated friction machine. Results show that at a preload of only 50 mN, the adhesion of the novel PDMS material is up to -3.7 times that of common PDMS. The maximum macroscale shear strength and normal adhesion reach 4 N·cm^-2 and 1 N·cm^-2, respectively. The adhesive capability of the material is maintained even after hundreds of times of repeated use. This novel material exhibits excellent adhesion, sufficiently high elastic modulus and high repeatability at low preloads.

关键词： polymeric composite adhesion carbon materials surface energy bionic

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Preparation and characterization of thermosensitive poly(NIPAM-co-MAH-β-CD)/(TiO_2-MWCNTs) composites by UV light photoinitiating method

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Chinese Chemical Letters 2012年第9期23卷 1071-1074页

作者： Hui Long Wang Li Pang Wen Feng Jiang Chao Yang Department of Chemistry Dalian University of TechnologyChina Dalian 116023 PetroChina Dalian Lubricating Oil R&D Institute China Dalian 116032

In this report, a novel thermosensitive poly（N-isopropylacrylamide-co-maleic anhydride-β-cyclodextrin）/（TiO2-multi-wal,led carbon nanotubes）（poly（NIPAM-co-MAH-β-CD）/（TiO2-MWCNTs）） composite was synthesized by UV light photoinitiating method. The results indicated that MAH modifiedβ-CD （MAH-β-CD） could polymerize to NIPAM by UV light irradiation in the presence of TiO2-MWCNTs composite nanoparticles. The characteristic results confirmed that the TiO2-MWCNTs composite nanoparticles were embedded evenly within the thermally responsive copolymer of NIPAM and MAH-β-CD. The effects of irradiation time and TiO2-MWCNTs concentration on the yield of the composites were investigated by keeping NIPAM to MAH-β- CD mass ratio constant. The optimal polymerization reaction conditions were a TiO2-MWCNTs concentration of 10 wt.% under UV light for the illumination of 3 h.

关键词： polymeric composite Thermosensitive Titania nanoparticles UV light

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