多种铁改性和未改性生物炭对模拟地下水中六价铬的去除

doi:10.13278/j.cnki.jjuese.20190207

摘要/Abstract

摘要： 为了研究不同类型的生物炭对模拟地下水中去除Cr（Ⅵ）的影响，选用杨木、柳木、桃木和松木为原料，分别在300℃和600℃热解温度下，制备不同粒径、经氯化铁改性的和未改性的20种生物炭，设计了一系列批实验，探究不同种类的生物炭对模拟地下水中Cr（Ⅵ）的去除效果；并采用傅里叶变换红外光谱（FTIR）和X射线近边吸收光谱（XANES）研究了生物炭去除Cr（Ⅵ）的机理。结果表明：在300℃下热解制成的改性生物炭，对Cr（Ⅵ）去除率均达到了99.0%以上；和粒径2 mm的生物炭相比，粒径<0.5 mm的生物炭对Cr（Ⅵ）有更好的去除效果；拟一级动力学方程较好地描述了300℃热解温度下杨木铁改性生物炭（FeCl3BC300Y）对Cr（Ⅵ）的去除过程。XANES分析结果表明，FeCl3BC300Y中的铬以三价的形态（Cr（Ⅲ））存在，FTIR分析表明羟基和羧基参与了Cr（Ⅵ）的去除。生物炭通过氧化还原和络合作用去除Cr（Ⅵ）。铁改性生物炭有望作为可渗透反应墙的填充材料，成为修复Cr（Ⅵ）污染地下水的新型材料。

关键词: 生物炭, 铁改性, 六价铬去除

Abstract: Biochar is usually used in Cr(Ⅵ) removal due to its micro porous structure and huge specific surface area, but different biochar has different removal efficiency. Choosing poplar, willow, peach,and pine as feedstocks, twenty types of biochar were prepared through pyrolysis of the FeCl₃-modified and unmodified biomass with different particle sizes at 300 ℃ or 600 ℃, respectively. A batch of experiments were performed to evaluate the efficiency of different biochar in removing hexavalent chromium from the simulated groundwater. The mechanism of Cr(Ⅵ) removal by biochar was investigated using Fourier transform infrared (FTIR) spectroscopy and X-ray absorption near edge spectrum (XANES). The results showed that the removal efficiency of the modified biochar by pyrolysis at 300 ℃ was over 99.0% of Cr(Ⅵ); The biochar (<0.5 mm) showed better removal efficiency than the biochar with a particle size of 2 mm; The Cr (Ⅵ) removal process by FeCl3BC300Y could be well described by the pseudo-first-order equation; XANES analysis suggested that the chromium on FeCl3BC300Y was in a trivalent state, and FTIR analysis indicated that hydroxyl and carboxylate groups contributed to Cr(Ⅵ) removal. The mechanism of Cr(Ⅵ) removal by biochar included reduction and complexation. The biochar modified by iron is expected as a filler material of permeable reactive barriers, and will become a new material to repair groundwater contaminated by hexavalent chromium.

Key words: biochar, iron modified, removal of hexavalent chromium

中图分类号:

X523

王晟, 冯翔, 李兵, 郭林, 曹坤, 刘鹏. 多种铁改性和未改性生物炭对模拟地下水中六价铬的去除[J]. 吉林大学学报(地球科学版), 2021, 51(1): 247-255.

Wang Sheng, Feng Xiang, Li Bing, Guo Lin, Cao Kun, Liu Peng. Removal of Hexavalent Chromium from Simulated Groundwater by Variety of Iron-Modified and Unmodified Biochars[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(1): 247-255.

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