摘要：

以果胶为稳定剂，制备果胶稳定的纳米级零价铁材料，进行试验，以期得到最佳反应条件，并进行动力学研究。结果表明，当果胶投加量为0.6 g/L，果胶-nZVI投加量为0.12 g/L，pH条件为5.5，环境温度为25℃时，反应60 min后Cr（Ⅵ）的去除率可达98.3%，反应可用伪一级反应动力学模型来描述。通过ln（C/C₀）对t作图进行曲线拟合，可以得到表观速率常数k_obs=0.013 2 min^-1和相关系数R²=0.835 1，证明ln（C/C₀）与t呈较为良好的线性关系。

关键词: 纳米零价铁, 果胶, 稳定剂, Cr(Ⅵ), 动力学模型

Abstract:

Using pectin as its stabilizer,the pectin-stabilized nanoscale zero-valent iron material has been prepared, and a batch of tests have been conducted,so as to obtain the optimum reaction conditions and carry out the kinetics research. The results show that when the dosage of pectin is 0.6 g/L,the pectin-nZVI dosage 0.12 g/L,pH 5.5,and environment temperature 25℃,the removing rate of Cr(Ⅵ) can reach 98.3% after reacted for 60 min. The pseudo-first-order reaction kinetics model can be used for describing this reaction. The apparent speed rate constant(k_obs=0.013 2 min^-1) and correlation coefficient(R²=0.835 1) can be obtained by making a curve fitting between ln(C/C₀) and reaction time,indicating that ln(C/C₀) and reaction time have a good linear relationship.

Key words: nanoscale zero-valent iron, pectin, stabilizer, hexa-valent chromium, kinetics model

中图分类号: 

• X703.1