Metallic nanoparticles decorated chitosan hydrogel wrapped pencil graphite: Effective catalyst for reduction of water pollutants and hydrogen production

催化作用 材料科学 亚甲蓝 核化学 纳米颗粒 甲基橙 金属 壳聚糖 纳米技术 无机化学 光催化 冶金 有机化学 化学
作者
Sher Bahadar Khan,Mohammad Sherjeel Javed Khan,Esraa M. Bakhsh,Kalsoom Akhtar,Abdullah M. Asiri
出处
期刊:Surfaces and Interfaces [Elsevier]
卷期号:31: 102004-102004 被引量:12
标识
DOI:10.1016/j.surfin.2022.102004
摘要

Chitosan hydrogel entrapped pencil graphite composite (CH/PG) was prepared with the strategy to confine metal nanoparticles (M0) in hydrogel. CH/PG could robustly anchor and remarkably disperse M0 on the surface and inside hydrogel. M0 like copper (Cu0@CH/PG), silver (Ag0@CH/PG), nickel (Ni0@CH/PG), cobalt (Co0@CH/PG) and iron (Fe0@CH/PG) were anchored in CH/PG hydrogel. All the prepared hydrogels were tested and displayed outstanding performance in reduction of water pollutants and hydrogen (H2) generation. The catalytic reduction of 4-nitrophenol (4-NP), 2-nitrophenol (2-NP), 2,6-dinitrophenol (2,6-DNP), methylene blue (MB), congo red (CR), methyl orange (MO), acridine orange (ArO), and potassium ferricynide (K3[Fe(CN)6]) were investigated using CH/PG and M0@CH/PG in the presence of NaBH4. In addition, CH/PG and M0@CH/PG were examined in hydrogen generation by methanolysis and hydrolysis of NaBH4. Among all the catalysts, CH/PG was more efficient in catalytic H2 generation (HGR = 2050 mLg–1min–1) while Ag0@CH/PG was more efficient in catalytic reduction of water contaminants. The reduction rate of Ag0@CH/PG was fast for 4-NP and reduced completely within 6.0 min with rate constant of 0.845 min–1. The impacts of different parameters like NaBH4 concentration, catalyst dosage, pollutant concentration, and temperature were precisely examined. Moreover, the recyclability of the catalyst was investigated up to three times, where slight decrease in reduction time was noted.
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