Surface modification of fly ash spheroidal particles and their application in the adsorption of phosphorus and chromium(VI) from single and competitive solute systems

IF 0.5 4区 环境科学与生态学 Q4 ENGINEERING, ENVIRONMENTAL Environment Protection Engineering Pub Date : 2020-01-01 DOI:10.37190/EPE200303
Chen Chen, T. Cheng, Xiao Zhang, Min-te Zhang, Rui Lv
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Abstract

This work focuses on the surface modification of fly ash spheroidal particles and their application in phosphorus and chromium(VI) adsorption. The results show that through surface modification, amorphous silica-alumina gels precipitated on the spheroidal particle surface (by which the microsurface area of the reaction products is effectively enlarged) and the surface zeta potential was changed to fit for adsorbing anions. During the adsorption experiment (single and competitive solute systems), chromium(VI) was easier to adsorb. The surface zeta potential and the existence of competitive ions should be recognized as two important factors affecting adsorption efficiency. A higher temperature could improve the adsorption efficiencies of the two solute systems. The fitting results of the pseudosecond-order model (single and competitive solute systems) show better agreement than those of the pseudo-first-order model at every temperature. The Langmuir adsorption isotherm equation can better simulate the adsorption process in single solute sy039stems, but only the chromium(VI) adsorption process can be fitted by the competitive Langmuir adsorption isotherm in competitive solute systems.
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粉煤灰球形颗粒的表面改性及其在单一和竞争溶质体系中吸附磷和铬(VI)的应用
本文主要研究了粉煤灰球形颗粒的表面改性及其在磷、铬吸附中的应用。结果表明,通过表面改性,非晶态硅铝凝胶在球形颗粒表面沉淀(有效地扩大了反应产物的微表面积),改变了表面zeta电位,使其适合吸附阴离子。在吸附实验中(单一溶质体系和竞争溶质体系),铬(VI)更容易吸附。表面zeta电位和竞争离子的存在是影响吸附效率的两个重要因素。较高的温度可以提高两种溶质体系的吸附效率。在各温度下,拟二阶溶质体系的拟合结果均优于拟一阶溶质体系的拟合结果。Langmuir吸附等温线方程能较好地模拟单一溶质体系中的吸附过程,但在竞争溶质体系中,竞争Langmuir吸附等温线只能拟合铬(VI)的吸附过程。
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来源期刊
Environment Protection Engineering
Environment Protection Engineering 环境科学-工程:环境
CiteScore
0.80
自引率
0.00%
发文量
9
审稿时长
12 months
期刊介绍: Water purification, wastewater treatment, water reuse, solid waste disposal, gas emission abatement, systems of water and air pollution control, soil remediation.
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