School of Geography and Environmental Science, Guizhou Normal University, Guiyang, 550025, China.
Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China.
Environ Sci Pollut Res Int. 2020 Jul;27(19):23871-23879. doi: 10.1007/s11356-020-08819-9. Epub 2020 Apr 16.
Manganese sulfate residue (MSR) is a by-product derived from the manganese sulfate production process. In this study, an iron hydroxide adsorbent was prepared from MSR using the hydrothermal conversion method. The adsorbent was characterized and used to remove copper(II) ions from aqueous solution. Batch experiments were performed to investigate the adsorption efficiency of copper ions at different contact times, initial concentrations, solution pH levels, and reaction temperatures. Adsorption equilibrium was observed in 3 h, and the best pH was under natural conditions (pH ∼ 5.5). Increasing the initial Cu concentration and reaction temperature can increase the adsorption quantity. The adsorption capacity of iron hydroxide at an initial concentration of 50 mg L was 14.515 mg g Cu(II) under the conditions of a nature pH and room temperature. According to the adsorption data, the pseudo-second-order model can describe the adsorption kinetics of copper ions well, and the Freundlich model provides an excellent fit to the adsorption isotherm. XRD and FTIR were applied to characterize the raw materials and adsorbents to reveal the adsorption mechanism. The results suggest that the adsorbent converted from MSR is a promising material for the removal of Cu(II) in aqueous solutions.
硫酸锰残渣（MSR）是由硫酸锰生产过程产生的一种副产品。在本研究中，采用水热转化法从 MSR 中制备了一种氢氧化铁吸附剂。对吸附剂进行了表征，并用于从水溶液中去除铜（II）离子。通过批次实验研究了不同接触时间、初始浓度、溶液 pH 值和反应温度下铜离子的吸附效率。吸附平衡在 3 小时内观察到，最佳 pH 值在自然条件下（pH∼5.5）。增加初始 Cu 浓度和反应温度可以提高吸附量。在初始浓度为 50mg/L 的条件下，铁氢氧化物在自然 pH 值和室温下对铜（II）的吸附量为 14.515mg/g。根据吸附数据，准二级动力学模型可以很好地描述铜离子的吸附动力学，而 Freundlich 模型对吸附等温线提供了很好的拟合。XRD 和 FTIR 被应用于对原材料和吸附剂进行表征，以揭示吸附机理。结果表明，由 MSR 转化的吸附剂是一种很有前途的用于去除水溶液中 Cu(II)的材料。
