应用响应面方法优化使用预处理锯屑去除水溶液中的铬(VI)的效果

IF 2.1 4区 环境科学与生态学 Q3 ENGINEERING, CHEMICAL
Samin Sirusbakht, Leila Vafajoo, Gordon McKay, Prakash Parthasarathy
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引用次数: 0

摘要

在工业应用中,铬作为三价铬和六价铬的用量不断增加,包括金属电镀、钢合金、皮革加工、医疗应用和铬染色操作,这导致了六(Cr)离子对水的污染,而六(Cr)离子具有毒性和致癌性,已发展成严重的环境和健康问题。这项研究的目的是利用改性锯屑这种廉价的吸附剂去除合成废水中的六(Cr)离子。我们制作了两种改性锯屑样品,一种使用氢氧化钠,另一种使用硫酸。实验基于多个批处理系统,在 25-65°C 温度下进行,锯屑用量为 0.5-1.5 克/升。这些条件适用于去除浓度为 1-6 ppm、pH 值为 3-10 的 Cr (VI) 离子。结果表明,对于经过处理和未经处理的锯木屑,其在锯木屑上的吸附遵循颗粒内扩散机制,速率参数从 0.65 到 5.24 mg g-1 min 不等。通过一系列温度研究确定了分布系数 k c、焓 Δ H、热力学标准自由能 Δ G 和熵Δ S。动力学研究表明,伪二阶模型与实验结果具有最佳相关性。Freundlich 和 Langmuir 等温线用于分析实验平衡结果。使用 D-optimal 设计方法得出了吸附过程的优化条件,并确定在 pH = 3、T = 25°C、吸附剂用量 = 1.5 g/L、初始 Cr (VI) 浓度 = 5.72 ppm 时,最大去除率为 100%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of response surface methodology to optimize chromium (VI) removal from aqueous solution using pre-treated sawdust

Increased chromium usage in industrial applications as chromium III and chromium VI, include metal plating, steel alloys, leather processing, medical applications, and chromium dyeing operations, has resulted in water pollution by Cr (VI) ions, which being toxic and carcinogenic has developed into significant environmental and health problems. The purpose of this research is to remove Cr (VI) ions from synthetic wastewater utilising modified sawdust as an inexpensive adsorbent. Two modified sawdust samples were produced, one using sodium hydroxide and one using sulfuric acid. The experimentation, based on several batch systems, has been undertaken at 25–65°C with 0.5–1.5 g/L sawdust dosage. These conditions were applied to remove Cr (VI) ions at concentrations of 1–6 ppm at pH values from 3 to 10. The results have shown that adsorption onto sawdust followed an intraparticle diffusion mechanism with various rate parameters from 0.65 to 5.24 mg g−1 min, for treated and untreated sawdust. The distribution coefficient k c , enthalpy Δ H , thermodynamic standard free energy Δ G , and entropy Δ S were determined from a number of temperature studies. Kinetic studies showed that the pseudo-second order model gave the optimum correlation to the experimental results. The Freundlich and Langmuir isotherms were applied to analyse the experimental equilibrium results. The optimised conditions for the adsorption process were obtained using the D-optimal design method, and the maximum removal percentage of 100%, was determined at pH = 3, T = 25°C, adsorbent dosage = 1.5 g/L, and an initial Cr (VI) concentration = 5.72 ppm.

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来源期刊
Environmental Progress & Sustainable Energy
Environmental Progress & Sustainable Energy 环境科学-工程:化工
CiteScore
5.00
自引率
3.60%
发文量
231
审稿时长
4.3 months
期刊介绍: Environmental Progress , a quarterly publication of the American Institute of Chemical Engineers, reports on critical issues like remediation and treatment of solid or aqueous wastes, air pollution, sustainability, and sustainable energy. Each issue helps chemical engineers (and those in related fields) stay on top of technological advances in all areas associated with the environment through feature articles, updates, book and software reviews, and editorials.
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