柠檬渣吸附污水中Hg<sup>2+</sup>的动力学研究

由于农业废弃物价格低廉, 改性后吸附性能优越等优点, 目前利用农业废弃物制作吸附剂吸附污水中的重金属逐渐成为研究热点。为了研究柠檬渣对污水中Hg2+的吸附动力学, 利用15%硫酸对柠檬渣进行了改性, 测试了吸附剂的孔容与孔径等性能, 并利用差热分析、红外光谱、电镜和能谱对样品进行了表征。结果表明改性柠檬渣吸附Hg2+的吸附速率由膜扩散控制, 符合膜扩散中Lagergren一级动力学方程, 该吸附过程主要为物理吸附。改性后的柠檬渣吸附性能有较大改善, 孔径分布主要是中孔; 有三个失重过程, 在66 ℃左右有一个吸热峰, 在316和494 ℃左右有两个放热峰。吸附前后并柠檬渣的基本框架没改变; 样品属于无定型结构。改性柠檬渣表面疏松、多孔, 能有效吸附Hg2+。

Abstract

With low price and its superior adsorption performance after modification, currently agricultural waste is used as adsorbent of heavy metals in wastewater, which has become a hot research topic. To study on Hg2+ from wastewater absorbed by lemon residues that has been modified by 15% concentration of sulphuric acid. The pore volume, pore size and other properties of the adsorbent were test. The samples were characterized by differential thermal analysis, IR, electron microscopy and spectroscopy. The result showed that the adsorption rate was controlled by membrane diffusion kinetics that was viewed as the first order kinetics equation of the Lagergren, which was physically absorbed. The adsorption properties of modified lemon residues were improved greatly, and the pore size distribution mainly was medium. There were three losses-weight process. There was a endothermic peak around 66 ℃ and two exotherm near 316 ℃ and 494 ℃. Basic framework of Lemon residues was not changed and structure of Lemon residues was amorphous; the surface of modified lemon residues loosen and many pores formed, and Hg2+ have been adsorbed effectively.

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沈王庆, 王淼, 杨婷. 柠檬渣吸附污水中Hg²⁺的动力学研究[J]. 光谱学与光谱分析, 2016, 36(3): 788. SHEN Wang-qing, WANG Miao, YANG Ting. Study on Kinetic of Hg²⁺ from Wastewater Absorbed by Lemon Residues[J]. Spectroscopy and Spectral Analysis, 2016, 36(3): 788.

柠檬渣吸附污水中Hg²⁺的动力学研究

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