scholarly journals Synthesis of Chitosan-Functionalized Fibrous Membrane for Immobilization of Horseradish Peroxidase: Interfacial Property and Application for Catalytic Oxidation of P-Nitrophenol

2018 ◽  
Vol 13 (2) ◽  
pp. 155892501801300
Author(s):  
Cuie Wang ◽  
Xinhua Liu
Keyword(s):  
Catalytic Oxidation ◽  
Enzyme Catalysis ◽  
Fibrous Membrane ◽  
Interfacial Property ◽  
Mass Loading ◽  
Hydrophobic Polymer ◽  
Immobilization Of Enzymes ◽  
Wide Ph Range ◽  
Ph Range

A hydrophilic fibrous membrane consisting of a network of a non-crystalline hydrophobic polymer and an in situ crosslinked hydrophilic chitosan polymer is studied. This chitosan-functionalized membrane can be employed as a support for immobilization of horseradish peroxidases (HRPs). The immobilized HRPs (mass loading ~110 mg /g) show high stabilities over a wide pH range of 4~10 and temperature range of 25~60°C. In addition, the immobilized HRPs can function as a recyclable biocatalyst for catalytic oxidation of p-nitrophenol (PNP). After 10 cycles, the PNP removal efficiency is 70 percent. The results demonstrate that the chitosan-functionalized fibrous membrane is a promising support for immobilization of enzymes and has applications related to enzyme catalysis.

Enhanced electrocatalytic activity of in situ carbon encapsulated molybdenum phosphide derived from a hybrid POM for the HER over a wide pH range

2022 ◽  
Author(s):  
Balasingh Thangadurai Jebaslinhepzybai ◽  
Elavarasan Samaraj ◽  
Thangaian Kesavan ◽  
Manickam Sasidharan ◽  
J. Arockia Selvi
Keyword(s):  
Electrocatalytic Activity ◽  
Molybdenum Phosphide ◽  
Wide Ph Range ◽  
Ph Range

Hybrid polyoxometalate derived in situ carbon encapsulated molybdenum phosphide (HPOM-MoP/C) exhibits excellent HER activity in a wide pH range.

Effect of speciation transformation on the coagulation behavior of Al13 and Al13 aggregates

2009 ◽  
Vol 59 (4) ◽  
pp. 815-822 ◽  
Author(s):  
Xiaohong Wu ◽  
Changqing Ye ◽  
Dongsheng Wang ◽  
Xiaopeng Ge ◽  
Hongxiao Tang
Keyword(s):  
Dominant Species ◽  
Chemical Interaction ◽  
Surface Adsorption ◽  
Surface Precipitation ◽  
Floc Size ◽  
Species Transformation ◽  
Wide Ph Range ◽  
Ph Range

Flocculation of kaolin suspension with aluminium fractal polycations was investigated as a function of aluminium concentration and pH. Aluminium flocculants included Al13 and Al13 aggregates with OH/Al ratio of 2.6 and 2.8, respectively. The flocculation kinetics and floc size distribution were monitored by light scattering. The characterization of flocculants showed that the tridecatmer Al13 and bridged [Al13]n with out-sphere structure were the dominant species for all flocculants in a wide pH range. The coagulation results indicated that the pre and in situ-formed [Al13]n play a key role in removing particles. With the increasing concentration of [Al13]n, coagulation mechanisms were transformed from charge-neutralization, electro-patch coagulation to bridge-aggregation. Moreover, sweep-flocculation was involved at higher dosage besides other three mechanisms when amorphous aluminium oxides formed. Hence, chemical interaction between particles and flocculants evolved from surface adsorption to surface precipitation for aluminium polycations by virtue of species transformation.

Cartap wastewater treatment by a microwave-induced catalytic oxidation procedure over Ce/Co/γ-Al2O3

2021 ◽  
Vol 11 (11) ◽  
pp. 1856-1865
Author(s):  
Kaixuan Liu ◽  
Fang Lian ◽  
Guoqi Wang ◽  
Jiaru Dai ◽  
Xuepeng Tian ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Oxidative Degradation ◽  
Degradation Process ◽  
Reaction Rates ◽  
Catalyst Design ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Wide Ph Range ◽  
Ph Range ◽  
Novel Catalyst

Microwave-assisted catalytic technology is potentially promising in the application of water treatment due to its merits of high reaction rates, simple equipment and operations. In case of the cartap wastewater rarely studied, the easy transformation of cartap into metabolites could induce higher toxicity. This study aimed to develop a novel catalyst Ce/Co/γ-Al2O3 to dispose cartap effectively. The catalyst was prepared by loading Ce and Co on the surface of the support Al2O3, followed by characterization with X-ray diffraction, scanning and transmission electron microscopies. Based on the treatment results, the microwave-induced catalytic oxidation procedure over Ce/Co/γ-Al2O3 could decompose the contaminants efficiently and fast in the case of a low oxidant dosage and a wide pH range. Under the conditions of pH of 5, microwave power of 450 W, catalyst dosage of 0.7 g and hydrogen peroxide dosage of 0.2 mL, the activity of Ce/Co/γ-Al2O3 catalyst could reach up to 86.08%. Importantly, the Ce/Co/γ-Al2O3 catalyst displayed excellent stability after using for 6 times in the degradation process. This work paved a new way for the effective catalyst design for efficient microwave-induced oxidative degradation.

Catalytic oxidation of polymer used in oilfield by bentonite supported Cu(II) complexes in a wide pH range

2021 ◽  
Vol 229 ◽  
pp. 314-321
Author(s):  
Liwa Ma ◽  
◽  
Yuying Xue ◽  
Weichao Du ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Wide Ph Range ◽  
Ph Range

In situ exsolved Co components on wood ear-derived porous carbon for catalyzing oxygen reduction over a wide pH range

2021 ◽  
Author(s):  
Yu Xu ◽  
Haiyan Zhang ◽  
Ping Zhang ◽  
Min Lu ◽  
Xiaoji Xie ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Active Sites ◽  
Reduction Reaction ◽  
Great Promise ◽  
Wide Ph Range ◽  
Ph Range ◽  
Carbon Catalysts

Carbon-based catalysts with transition metal active sites hold great promise for electrochemically catalyzing oxygen reduction reaction (ORR). However, it is still challenging to fabricate carbon catalysts containing transition metal active...

A novel nonheme manganese(ii) complex for (electro) catalytic oxidation of water

2020 ◽  
Vol 4 (6) ◽  
pp. 2656-2660
Author(s):  
Dattaprasad D. Narulkar ◽  
Koteshwar Devulapally ◽  
Anil Kumar U. ◽  
Sunder N. Dhuri ◽  
Vishal M. Dhavale ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Water Oxidation ◽  
Metal Site ◽  
Wide Ph Range ◽  
Ph Range ◽  
Electro Catalytic Oxidation

A nonheme single-metal-site Mn-complex i.e. [Mn(N3Py2)H2O] (ClO4)2; where N3Py2 = N,N′-dimethyl-N-(2-(methyl(pyridin-2-ylmethyl)amino)-ethyl-N′-(pyridin-2-ylmethyl)ethane-1,2-diamine) displays electrochemical water oxidation ability in a wide pH range.

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