Preparation of Highly Uniform Polyurethane Microspheres by Precipitation Polymerization and Pd Immobilization on Their Surface and Their Catalytic Activity in 4-Nitrophenol Reduction and Dye Degradation

2020 ◽  
Vol 59 (7) ◽  
pp. 2998-3007 ◽  
Author(s):  
Xingjie Yang ◽  
Xubao Jiang ◽  
Muhammad Sohail Bashir ◽  
Xiang Zheng Kong
Keyword(s):  
Catalytic Activity ◽  
Dye Degradation ◽  
Precipitation Polymerization ◽  
Nitrophenol Reduction ◽  
Highly Uniform

scholarly journals Palladium-Supported Zirconia-Based Catalytic Degradation of Rhodamine-B Dye from Wastewater

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1522
Author(s):  
Salma Jabeen ◽  
Muhammad Sufaid Khan ◽  
Rozina Khattak ◽  
Ivar Zekker ◽  
Juris Burlakovs ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rhodamine B ◽  
Dye Degradation ◽  
Freundlich Isotherm ◽  
Impregnation Method ◽  
K Value ◽  
First Order Kinetics ◽  
Good Catalytic Activity ◽  
Rhodamine B Dye ◽  
Best Fit

The catalytic activity of Pd/ZrO2 was studied in terms of the degradation of rhodamine-B dye in the presence of hydrogen peroxide. Pd/ZrO2 was prepared by impregnation method, calcined at 750 °C and characterized by XRD, SEM and EDX. The catalyst showed good catalytic activity for dye degradation at 333 K, using 0.05 g of the catalyst during 5 h. The reaction kinetics followed the pseudo-first order kinetics. The Freundlich, Langmuir and Temkin isotherms were applied to the data and the best fit was obtained with Freundlich isotherm. Thermodynamic parameters, like ΔH, ΔG and ΔS were also calculated. The negative values of ΔH (−291.406 KJ/mol) and Gibbs free energy (ΔG) showed the exothermic and spontaneous nature of the process. The positive ΔS (0.04832 KJ/mol K) value showed suitable affinity of catalyst for dye degradation. The catalyst was very stable, active and was easily separated from the reaction mixture by filtration. It can be concluded from the results that the prepared catalyst could be effectively used in dyes degradation/removal from water subjected to further validation and use for various dyes.

A New 2D Layered Aluminophosphate |Hada|6[Al6(PO4)8](H2O)11 Supported Highly Uniform Ag Nanoparticles for 4-Nitrophenol Reduction

2021 ◽  
Author(s):  
Jiang-Zhen Qiu ◽  
Long-Fei Wang ◽  
Xugang Shu ◽  
Cuijin Li ◽  
Zhongke Yuan ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Two Dimensional ◽  
Nitrophenol Reduction ◽  
Highly Uniform

Aluminophosphate with |Hada|6[Al6(PO4)8](H2O)11 (denoted as ZHKU-1) of a new two-dimensional (2D) layer has been synthesized by adopting the template of alkylated memantine. The structure of ZHKU-1 was constructed from the...

scholarly journals Co3O4/TiO2 hetero-structure for methyl orange dye degradation

2018 ◽  
Vol 79 (5) ◽  
pp. 947-957 ◽  
Author(s):  
Mahabubur Chowdhury ◽  
Sarah Kapinga ◽  
Franscious Cummings ◽  
Veruscha Fester
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Environmental Remediation ◽  
Metal Ion ◽  
Dye Degradation ◽  
Lattice Structure ◽  
Host Lattice ◽  
Commercial Application ◽  
Potential Candidate ◽  
Methyl Orange Degradation

Abstract Advanced oxidation processes based on sulphate radical generated by peroxymonosulphate (PMS) activation is a promising area for environmental remediation. One of the biggest drawbacks of heterogeneous PMS activation is catalyst instability and metal ion leaching. In this study, a simple organic binder mediated route was explored to substitute Ti4+ ions into the Co3O4 host lattice structure to create a Co-O-Ti bond to minimise cobalt leaching during methyl orange degradation. The catalyst was characterised by X-ray diffraction, and scanning and transmission electron microscopy. The as-prepared catalysts with Co3O4:TiO2 ratio of 70:30 exhibited minimal leaching (0.9 mg/L) compared to other ratios studied. However, the pristine Co3O4 exhibited highest catalytic activity (rate constant = 0.41 min−1) and leaching (26.7 mg/L) compared to composite material (70:30 Co3O4:TiO2). Interestingly, the morphology of the composite and leaching of Co2+ ions were found to be temperature dependent, as an optimum temperature ensured strong Co-O-Ti bond for prevention of Co2+ leaching. The classical quenching test was utilised to determine the presence and role of radical species on methyl orange degradation. The fabricated catalyst also exhibited good catalytic activity in degrading mixed dyes and good recyclability, making it a potential candidate for commercial application.

Branched Ag nanoplates: synthesis dictated by suppressing surface diffusion and catalytic activity for nitrophenol reduction

CrystEngComm ◽  
2017 ◽  
Vol 19 (42) ◽  
pp. 6339-6346 ◽  
Author(s):  
Taixing Tan ◽  
Shun Zhang ◽  
Cheng Wang
Keyword(s):  
Catalytic Activity ◽  
Surface Diffusion ◽  
Diffusion Rate ◽  
Nitrophenol Reduction

Highly branched Ag nanoplates were achieved at extremely low Ag atoms surface diffusion rate, fulfilledviathe Cu under potential deposition.

Chitosan modified Cu2O nanoparticles with high catalytic activity for p-nitrophenol reduction

2019 ◽  
Vol 480 ◽  
pp. 601-610 ◽  
Author(s):  
Yan Guo ◽  
Mingming Dai ◽  
Zhixu Zhu ◽  
Yuqi Chen ◽  
Hui He ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Nitrophenol Reduction ◽  
Cu2o Nanoparticles

Bromine anion-induced synthesis of copper nanoplates and their recyclable catalytic activity towards 4-nitrophenol reduction

CrystEngComm ◽  
2020 ◽  
Vol 22 (45) ◽  
pp. 7786-7789
Author(s):  
Yao Li ◽  
Zhengyang Fan ◽  
Hongwei Yang ◽  
Ximin Yuan ◽  
Yunxiu Chao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Crystal Plane ◽  
Copper Nanowires ◽  
Nitrophenol Reduction ◽  
Strong Adsorption

Selective strong adsorption of bromine ions on the {111} crystal plane of copper blocked the growth along the {111} crystal plane and thereby promoted the formation of copper nanoplates instead of copper nanowires.

scholarly journals Facile Synthesis of Silver Nanoparticles Stabilized by Cationic Polynorbornenes and Their Catalytic Activity in 4-Nitrophenol Reduction

Langmuir ◽  
2013 ◽  
Vol 29 (13) ◽  
pp. 4225-4234 ◽  
Author(s):  
Bharat Baruah ◽  
Gregory J. Gabriel ◽  
Michelle J. Akbashev ◽  
Matthew E. Booher
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Facile Synthesis ◽  
Nitrophenol Reduction
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