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首页> 外文期刊>Environmental Science and Pollution Research >Synthesis of novel sepiolite-iron oxide-manganese dioxide nanocomposite and application for lead(II) removal from aqueous solutions
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Synthesis of novel sepiolite-iron oxide-manganese dioxide nanocomposite and application for lead(II) removal from aqueous solutions

机译：新型海泡石 - 氧化铁 - 二氧化锰纳米复合材料的合成及铅（II）从水溶液中除去

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摘要

In this study, the sepiolite-iron oxide-manganese dioxide (Sep-Fe3O4-MnO2) nanocomposite was synthesized and applied as a magnetically separable adsorbent for removal of Pb(II) ions from water in a batch system. The effects of initial Pb(II) concentration, adsorbent dosage, contact time, pH value, and temperature were investigated to optimize the conditions for maximum adsorption. The equilibrium adsorption data were analyzed with the Langmuir, Freundlich, and Temkin models. The adsorption process closely agreed with the Langmuir adsorption isotherm, and the monolayer saturation adsorption value was achieved as 131.58 mg g(-1). The adsorption kinetics follow the pseudo-second-order (PSO) model that illustrated the rate controlling step might be chemisorption. Thermodynamic investigations for the removal process were conducted by determining the values of G degrees, H degrees, and S degrees. The adsorption behavior of Pb(II) on the Sep-Fe3O4-MnO2 was a spontaneous and endothermic process. Several consecutive adsorption-desorption cycles confirmed that the proposed Sep-Fe3O4-MnO2 nanocomposite could be reused after successive lead removal. Furthermore, the practical application of the adsorbent was successfully realized by the treatment of real Pb-contaminated water samples.
机译：在该研究中，合成了海硫醇盐 - 氧化铁 - 二氧化锰（SeP-Fe3O4-MnO 2）纳米复合材料，用作磁性可分离的吸附剂，用于在批量系中从水中除去Pb（II）离子。研究初始PB（II）浓度，吸附剂剂量，接触时间，pH值和温度的影响，优化最大吸附的条件。用Langmuir，Freundlich和Temkin模型分析了平衡吸附数据。吸附过程与Langmuir吸附等温线密切合法，并且单层饱和吸附值达到131.58mg g（-1）。吸附动力学遵循所示速率控制步骤的伪二阶（PSO）模型可能是化学吸取。通过确定G度，H度和S度值的值进行去除过程的热力学研究。 Pb（II）对Sep-Fe3O4-mnO2的吸附行为是自发性和吸热过程。几种连续的吸附 - 解吸循环证实，所提出的Sep-Fe 3 O 4 -mNO2纳米复合材料可以在连续的铅去除后重复使用。此外，通过治疗真实的PB污染的水样，成功地实现了吸附剂的实际应用。

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