Esmaeili Abbas, Eslami Hadi
Occupational Environment Research Center, Department of Environmental Health Engineering, School of Health, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
Department of Environmental Health Engineering, School of Health, Rafsanjan University of Medical Science, Rafsanjan, Iran.
MethodsX. 2020 Jan 23;7:100804. doi: 10.1016/j.mex.2020.100804. eCollection 2020.
This study was carried out to investigate Pb (II) and Zn (II) removal from aqueous solutions by Red Earth (RE) as a new local natural adsorbent in using the batch method. The chemical structure of RE adsorbent was characterized by XRF. Giles, Langmuir, and Freundlich isotherms were used to describe the adsorption data. The effect of metals concentration, initial pH, adsorbent dosage, and agitation time were studied. The results showed that RE contains of SiO (58 %) and AlO (15.2 %) as major compounds. The equilibrium time was reached following 30 min and the maximum adsorption capacities (mg/g), based on Langmuir equation were 10.31 and 8.74 for Pb (II) and Zn (II), respectively. By increasing the initial metal ions concentration, the adsorption efficiencies were decreased and adsorption capacity of RE increased with an increase in the initial pH.
本研究旨在采用分批法，以一种新型本地天然吸附剂红土（RE）从水溶液中去除铅（II）和锌（II）。通过XRF对RE吸附剂的化学结构进行了表征。采用吉尔斯等温线、朗缪尔等温线和弗伦德利希等温线来描述吸附数据。研究了金属浓度、初始pH值、吸附剂用量和搅拌时间的影响。结果表明，RE主要成分包含SiO（58%）和AlO（15.2%）。30分钟后达到平衡时间，基于朗缪尔方程，铅（II）和锌（II）的最大吸附容量（mg/g）分别为10.31和8.74。随着初始金属离子浓度的增加，吸附效率降低，RE的吸附容量随初始pH值的增加而增加。
