To efficiently control manganese pollution, two kinds of ceramsites with pH self-adjustment ability, being synthesized from lime mud and coal fly ash, were employed to remove Mn2+ from aqueous solutions. The influence of different parameters like contact time, concentration of Mn2+ and pH on adsorption performance was examined. Also, the mechanism of Mn2+ removal by the ceramsites was investigated thoroughly. The results showed that the maximum Mn2+ adsorption capacity of ceramsites was 2.54±0.03 mg/g and the time required to reach equilibrium was about 4h. The pseudo-second-order kinetic model and the Langmuir model could better describe the adsorption kinetic experimental data and isotherms process, respectively. During the adsorption process of Mn2+, pH self-adjustment ability of ceramsites played a leading role in creating an alkaline environment to form precipitation MnO(OH)2, which was subsequently adsorbed onto the surface of the ceramsites. This study suggests ceramsites with pH self-adjustment ability have enormous potential in the application for removing Mn2+ from wastewater.

中文翻译：

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白泥和粉煤灰简易合成陶粒对Mn2+的吸附性能及机理研究

为有效控制锰污染，采用白泥和粉煤灰合成两种具有pH自调节能力的陶粒去除水溶液中的Mn2+。考察了不同参数如接触时间、Mn2+ 浓度和 pH 值对吸附性能的影响。此外，陶粒去除Mn2+的机理也得到了彻底的研究。结果表明，陶粒对Mn2+的最大吸附量为2.54±0.03 mg/g，达到平衡所需的时间约为4h。拟二级动力学模型和朗缪尔模型分别能更好地描述吸附动力学实验数据和等温线过程。在Mn2+的吸附过程中，陶粒的pH自调节能力在创造碱性环境形成沉淀MnO(OH)2的过程中起主导作用，MnO(OH)2随后被吸附到陶粒表面。该研究表明，具有 pH 值自调节能力的陶粒在去除废水中的 Mn2+ 方面具有巨大的应用潜力。