Enhanced reduction of p-nitrophenol by zerovalent iron modified with carbon quantum dots

零价铁 碳量子点 还原(数学) 碳纤维 量子点 硝基苯酚 零(语言学) 化学 4-硝基苯酚 材料科学 化学工程 纳米技术 数学 纳米颗粒 复合材料 物理化学 有机化学 催化作用 复合数 吸附 哲学 工程类 语言学 几何学
作者
Peng Fan,Xuanjun Zhang,Huanhuan Deng,Xiaohong Guan
出处
期刊:Applied Catalysis B-environmental [Elsevier BV]
卷期号:285: 119829-119829 被引量:70
标识
DOI:10.1016/j.apcatb.2020.119829
摘要

The pollution of aromatic nitro compounds in water is a critical issue, and the reduction of p-nitrophenol (p-NP) by the combination of catalyst/reductant has been a hot topic in recent years. The methods reported previously bore several defects, such as high cost for material synthesis and secondary pollution to the environment. Herein, this study employed the non-toxic and inexpensive materials, carbon quantum dots (C-dots) as the catalyst and zerovalent iron (ZVI) as the reductant, to prepare the ZVI modified with C-dots ([email protected]) for p-NP removal in water under anaerobic condition. The results showed that the removal rate of p-NP, the capacity, and the selectivity of ZVI towards p-NP removal were greatly improved, due to the involvement of C-dots. The rate constant of p-NP removal by [email protected] was 1192.7 folds of that by ZVI. The capacity of p-NP removal by [email protected] at 24.0 h was 24.8 orders of magnitude higher than that of ZVI. At the end of 2.0 h reaction with p-NP, the utilization ratio and electron efficiency of [email protected] were increased by 3.7 times and 2.9 times, respectively, compared to those of ZVI. The enhancing effect of C-dots on p-NP sequestration by ZVI should be mainly associated with the promoted hydrophobicity of ZVI surface, the facilitated electron transfer, and the accelerated corrosion of ZVI. As an innovative catalyst/reductant system for p-NP reduction, [email protected] is effective, facile, low-cost, and environmental-friendly.
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