Chitosan–silica nanoparticles catalyst (M@CS–SiO2) for the degradation of 1,1-dimethylhydrazine

Wang, Junru; Zhou, Yucheng; Shao, Yamin; He, Feng; Wu, Min; Ni, Henmei; Zheng, Yufeng; Sun, Yueming

doi:10.1007/s11164-018-3697-1

Cited by 16 publications

(2 citation statements)

References 45 publications

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“…Many techniques, such as chlorination [ 17 ], coagulation/sedimentation [ 18 , 19 ], ozonation [ 20 – 22 ], oxidation [ 23 – 26 ], biofiltration [ 27 – 29 ], adsorption [ 3 , 30 – 34 ], have been used for drug removal from aqueous media. Among these methods, adsorption and catalytic wet peroxidation (CWPO) have an important place with the advantages of easy application, economic and effective removal potential [ 35 – 37 ]. Hydrogen peroxide as an oxidation agent during the degradation of organic substances by CWPO method is an environmentally friendly oxidant that does not cause harmful by-product formation, and hydroxyl radicals are formed by the decomposition of hydrogen peroxide with the effect of catalyst and heat.…”

Section: Introductionmentioning

confidence: 99%

Removal of naproxen and diclofenac using magnetic nanoparticles/nanocomposites

2022

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Magnetic iron oxide and iron/copper nanoparticles were synthesized using Lathyrus brachypterus extract, and then magnetic Fe 3 O 4 –CS, Fe 3 O 4 –AT, Fe/Cu–CS and Fe/Cu–AT nanocomposite beads were synthesized using chitosan and alginate natural polymers. They were used for both adsorption and heterogeneous catalysts for the catalytic wet peroxidation (CWPO) of naproxen (NPX), diclofenac (DCF) and NPX + DCF drugs which are important micro-organic pollutants, separately and together (NPX + DCF) from aqueous media. In adsorption studies, the drugs were adsorbed very quickly in the first minutes and then, desorbed in between 8 and 10 min. In competitive adsorption, the adsorbents showed selective properties for DCF and NPX. In CWPO technique, drug removal was achieved in 9 min with a conversion capacity of 92% for DCF with Fe/Cu–CS and 84% for NPX with Fe/Cu–AT optimum experimental conditions, such as pH 5, 30% of H 2 O 2 , 100 mg catalyst and 298 K. Based on reusability of the catalysts, it was seen that there was a slight decrease in the removal efficiencies in the third cycle and the stable and active structure of the catalyst was preserved to the desired extent. Furthermore, the oxidation reaction was in good agreement with the pseudo-first-order kinetic model. Graphical abstract

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Section: Introductionmentioning

confidence: 99%

Removal of naproxen and diclofenac using magnetic nanoparticles/nanocomposites

2022

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“…In their study, under reaction conditions of 418 K and 0.8 MPa, the cyclohexane oxidation catalyzed by chitosan-supported iron (III) tetraphenylporphyrin had 10.48% cyclohexane conversion and 79.20% cyclohexanone and cyclohexanol selectivity. Wang et al 38 prepared the Cu-M@CS-SiO 2 degrading 1,1-dimethyl hydrazine (UDMH) wastewater. The COD removal of UDMH wastewater was 87.38% in half an hour.…”

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confidence: 99%

Optimization of catalytic wet oxidating fulvic acid with zero-valent copper chitosan activated carbon ball as the catalyst

Song

Qin

et al. 2021

Sci Rep

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The degradation efficiency of fulvic acid (FA) was investigated in the catalytic wet oxidation process (CWPO) by zero-valent copper chitosan activated carbon ball (ZVC/CTS-ACB). Characterization of ZVC/CTS-ACB shows that zero-valent copper was loaded successfully on the chitosan activated carbon. Plackett–Buiman (PB) design and response surface methodology (RSM) were employed to determine the influence factors and the optimum processing parameters. The model was well fitted to the actual data and the correlation coefficients of R2 and R2-adj were 0.9359 and 0.9039, respectively. Under the obtained optimum conditions for FA degradation: temperature = 94 °C and pH 3.8, the average FA removal by three replicate experiments was 93.02%, which has a high consistency to the RSM optimal target response of 93.86%. The comparison of catalytic performance showed that the addition of catalyst ZVC/CTS-ACS could increase the removal rate of FA, color number (CN) and TOC by 93.6%, 83.5% and 81.9% respectively. The high TOC removal rate indicated the good performance of the catalyst to FA mineralization. Additionally, the ICP analysis of copper ion leaching was only 0.08 mg/l after 5 repeated recycles of the catalyst, demonstrating the high stability of ZVC/CTS-ACB that is beneficial for the actual application.

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