Preparation of porous semi-IPN temperature-sensitive hydrogel-supported nZVI and its application in the reduction of nitrophenol

论文摘要

Nanoscale zero-valent iron（n ZVI） particles supported on a porous, semi-interpenetrating（semi-IPN）, temperature-sensitive composite hydrogel（PNIPAm-PHEMA）. n ZVI@PNIPAmPHEMA, was successfully synthesized and characterized by FT-IR, SEM, EDS, XRD and the weighing method. The loading of nZVI was 0.1548 ± 0.0015 g/g and the particle size was30–100 nm. NZVI was uniformly dispersed on the pore walls inside the PNIPAm-PHEMA.Because of the well-dispersed n ZVI, the highly porous structure, and the synergistic effect of PNIPAm-PHEMA, nZVI@PNIPAm-PHEMA showed excellent reductive activity and wide p H applicability. 95% of 4-NP in 100 m L of 400 mg/L 4-NP solution with initial p H 3.0–9.0 could be completely reduced into 4-AP by about 0.0548 g of fresh supported n ZVI at 18–25 °C under stirring（110 r/min） within 45 min reaction time. A greater than 99% 4-NP degradation ratio was obtained when the initial p H was 5.0–9.0. The reduction of 4-NP by nZVI@PNIPAm-PHEMA was in agreement with the pseudo-first-order kinetics model with Kobsvalues of 0.0885–0.101 min-1.NZVI@PNIPAm-PHEMA was able to be recycled, and about 85% degradation ratio of 4-NP was obtained after its sixth reuse cycle. According to the temperature sensitivity of PNIPAmPHEMA, n ZVI@PNIPAm-PHEMA exhibited very good storage stability, and about 88.9%degradation ratio of 4-NP was obtained after its storage for 30 days. The hybrid reducer was highly efficient for the reduction of 2-NP, 3-NP, 2-chloro-4-nitrophenol and 2-chloro-4-nitrophenol. Our results suggest that PNIPAm-PHEMA could be a good potential carrier, with n ZVI@PNIPAm-PHEMA having potential value in the application of reductive degradation of nitrophenol pollutants.

论文目录

文章来源

类型: 期刊论文

作者: Lixia Li,Ruiwei Wang,Xiaodong Xing,Wenqiang Qu,Shutong Chen,Yunlong Zhang

来源: Journal of Environmental Sciences 2019年08期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: School of Environment and safety engineering, Jiangsu University,School of Chemical Engineering, Nanjing University of Science and Technology

基金: supported by the National Natural Science Foundation of China(No.51508233),the Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment

分类号: X703

页码: 93-102

总页数: 10

文件大小: 957K

下载量: 43

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