The aim of this study is to evaluate the effect of Fe3O4 nanoparticle, stabilized with polyacrylic acid on cadmium removal from the contaminated soils. To investigate the effect of important parameters, including nanoparticle concentration, pH, contact time, and the ratio of contaminated soil mass to nanofluid volume, several batch tests were performed. The maximum removal rate (100%) of cadmium was obtained in the following conditions: nanofluid concentration = 500 ppm, pH = 6.5, contact time = 24 hr and the ratio of contaminated soil mass (gr) to nanofluid volume (mL) = 1:150. Results of selective sequential extraction tests showed that the distribution of cadmium in different fractions of the soil was carbonates, oxides and hydroxides, residual fraction, exchangeable, and organic matter respectively. The tendency of nanoparticles for removal of Cd2+ from the soil fractions was in the order of: exchangeable > carbonates > oxides and hydroxides > organic matter > residual.

中文翻译：

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使用聚丙烯酸稳定的氧化铁 (III) 纳米颗粒去除污染土壤中的镉

本研究的目的是评估用聚丙烯酸稳定的 Fe3O4 纳米颗粒对从污染土壤中去除镉的影响。为了研究重要参数的影响，包括纳米颗粒浓度、pH 值、接触时间和受污染土壤质量与纳米流体体积的比率，进行了多次批量测试。镉的最大去除率 (100%) 在以下条件下获得：纳米流体浓度 = 500 ppm，pH = 6.5，接触时间 = 24 小时，污染土壤质量 (gr) 与纳米流体体积 (mL) 的比率 = 1 :150。选择性连续提取试验结果表明，镉在土壤不同组分中的分布分别为碳酸盐、氧化物和氢氧化物、残留组分、可交换物和有机质。