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Sorption of Cd(II) and Pb(II) ions by nanolimestone from underground water samples from Tehama region of Saudi Arabia
Indian Journal of Chemistry, Section A ( IF 0.412 ) Pub Date : 2020-03-20
Ahmed H Ragab, Inas A Ahmed, Dina D Bader

Powdered nano limestone (NLS) has been investigated as an in-expensive adsorbent for removal of heavy toxic metals such as cadmium and lead from aqueous solutions. Batch experiments has been carried out, the favorable pH for maximum metals adsorption is found to be 6.8 for both. The surface area has increased in case of NLS up to 6.2 m2/g. The adsorption capacity calculated by Langmuir equation is found to be 75.1 mg/g for Cd (II) and 68.4 for Pb (II) ions at pH 6.8. The adsorption capacity has increased with temperature and the kinetics followed a First-order rate equation for both. The enthalpy change (ΔH0) is 25.4 J mol−1 for Cd (II) and 20.8 J mol−1 for Pb (II), while entropy change (ΔS0) is 41.6 J K−1 mol−1 for Cd (II) and 38.7 J K−1 mol−1 Pb (II), which indicate that adsorption process is endothermic and spontaneous in nature. About 25 collected samples of groundwater has been tested and found to be contaminated with cadmium and lead elements with different rates, with using NLS as adsorbent able to remove both metals from the samples. All of the results suggested that the NLS is excellent nano-adsorbents for cadmium and lead contaminated water samples.

中文翻译:

纳米石灰石从沙特阿拉伯Tehama地区的地下水样品中吸附Cd(II)和Pb(II)离子

粉末状纳米石灰石(NLS)已作为廉价的吸附剂进行了研究,用于从水溶液中去除重金属如镉和铅。已经进行了分批实验,发现两种金属的最大吸附的有利pH均为6.8。在NLS的情况下表面积增加至6.2m 2 / g。通过Langmuir方程计算得出的吸附容量在pH 6.8时对Cd(II)为75.1 mg / g,对Pb(II)离子为68.4。吸附容量随温度的升高而增加,动力学均遵循一阶速率方程。焓变(ΔH 0)是25.4Ĵ摩尔-1镉(II)和20.8Ĵ摩尔-1对Pb(II),而熵变(ΔS 0)为41.6 JK-1摩尔-1镉(II)和38.7 JK -1摩尔-1的Pb(II),这表明吸附过程是吸热的,并在本质上自发的。测试了大约25个收集的地下水样品,发现它们以不同的比率被镉和铅元素污染,使用NLS作为吸附剂能够从样品中去除两种金属。所有结果表明,NLS是镉和铅污染的水样品的优良纳米吸附剂。
更新日期:2020-03-20
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