Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners

吸附 吸附 弗伦德利希方程 朗缪尔 化学 环境化学 土壤水分 环境工程 污染 重金属 延迟因子 环境科学 土壤科学 色谱法 生态学 有机化学 生物 柱色谱法
作者
Daniela Lima Machado da Silva,Maria Eugênia Gimenez Boscov,M. Costa,Laércio Leal dos Santos,Márcio Camargo de Melo,Veruschka Escari�ão Dessoles Monteiro
出处
期刊:Adsorption Science & Technology [SAGE Publishing]
卷期号:2023 被引量:1
标识
DOI:10.1155/2023/5973552
摘要

Hazardous heavy metal ions such as copper, zinc, nickel, chromium, cadmium, and lead engender a potential risk to human health. Among the processes involved in the retention of these contaminants, adsorption is advantageous for removing toxic metals because of its environmentally friendly aspect, efficiency, and low-cost operation. Information on the adsorption of heavy metals in soils from the semiarid region of northeastern Brazil is still scarce. In this study, the adsorption of heavy metals (Cd, Cu, Zn, Ni, and Pb) by a semiarid Brazilian bentonitic soil is investigated. This soil has been used as a bottom liner in an experimental municipal solid waste (MSW) cell located in Campina Grande, State of Paraíba, Brazil. The experimental cell consists of a landfill unit on an experimental scale, with the same constructive elements of a sanitary landfill. Disturbed and undisturbed samples of the investigated soil were collected at a quarry in the rural zone of Boa Vista (state of Paraiba, Northeast Brazil). Sorption attributes were determined via batch tests with a soil-solution ratio of 1 : 12.5 (4 g of dry soil to 50 mL of solution). Linear, Freundlich, and Langmuir isotherms were fitted to the experimental data, using as fitting parameters Pearson correlation coefficient ([Formula: see text]) and [Formula: see text] value with a significance level [Formula: see text]. The ascending order of maximum adsorption capacity for heavy metals followed the series Ni < Cr < Zn < Cd < Cu < Pb. The maximum adsorbent capacities obtained were similar to those of other Brazilian soils and other adsorbents. Therefore, the studied soil has a high potential to be used in the retention of heavy metals.
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