孔雀绿
零价铁
化学
萃取(化学)
阳离子聚合
亚甲蓝
动力学
纳米颗粒
分散剂
表面改性
多酚
核化学
化学工程
催化作用
色散(光学)
色谱法
吸附
有机化学
物理化学
光催化
抗氧化剂
光学
物理
工程类
量子力学
作者
Xiangyu Wang,Anqi Wang,Jun Ma,Ming‐Lai Fu
出处
期刊:Chemosphere
[Elsevier]
日期:2016-09-29
卷期号:166: 80-88
被引量:82
标识
DOI:10.1016/j.chemosphere.2016.09.056
摘要
For the first time, an integrated green technology by coupling functional nanoscale zero-valent iron (NZVI) with ultrasound (US) was innovatively developed for the enhanced decolorization of malachite green (MG) and methylene blue (MB). The functional NZVI (TP-Fe) was successfully fabricated via a facile, one-step and environmentally-benign approach by directly introducing high pure tea polyphenol (TP), where TP contenting abundant epicatechin was employed as reductant, dispersant and capping agent. Note that neither additional extraction procedure nor protection gas was needed during the entire synthesis process. Affecting factors (including US frequency, initial pH, dye concentration, and reaction temperature) were investigated. Results show that TP-Fe exhibited enhanced activity, antioxidizability and stability over the reaction course, which could be attributed to the functionalization of TP on NZVI and the invigorating effect of US (i.e., improving the mass transfer rate, breaking up the aggregates of TP-Fe nanoparticles, and maintaining the TP-Fe surface activity). The kinetics for MG and MB decolorization by the TP-Fe/US system could be well described by a two-parameter pseudo-first-order decay model, and the activation energies of MG and MB decolorization in this new system were determined to be 21 kJ mol−1 and 24 kJ mol−1, respectively. In addition, according to the identified reaction products, a possible mechanism associated with MG and MB decolorization with the TP-Fe/US system was proposed.
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