Lime-Amended Semi-arid Soils in Retaining Copper, Lead, and Zinc from Aqueous Solutions
Lime-Amended Semi-arid Soils in Retaining Copper, Lead, and Zinc from Aqueous Solutions
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DOI：
10.1007/s11270-016-3054-1
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发表时间：
2016-09
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通讯作者：
A. Moghal;K. Reddy;S. A. S. Mohammed-S.-A.-S.-Mohammed-92228389;M. Al-Shamrani;W. M. Zahid
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作者：
A. Moghal;K. Reddy;S. A. S. Mohammed-S.-A.-S.-Mohammed-92228389;M. Al-Shamrani;W. M. Zahid
大多数含有来自人类活动的不可生物降解金属污染物的化学品在性质上具有高度移动的性。遏制或限制其移动的唯一方法是通过土壤基质中的吸附和捕获。在这项研究中，三个最常见的二价金属污染物，铜（Cu +2），铅（Pb +2），锌（Zn +2）的吸附反应，使用两个本地可用的半干旱土壤从沙特阿拉伯进行了研究。为了提高其保持能力，这些土壤用石灰进行改良。在不同的初始污染物浓度，pH值条件下，温度水平，和稀释比的吸附反应进行了研究。依靠经验模型（朗缪尔和Freundlich），吸附（单层或异质）的性质是确定的。此外，动力学模型用于验证发生的吸附的类型和性质（无论是伪一阶或二阶）。结果发现，实验结果与这些经验模型的铝-加特和铝-Qatif土壤时，用石灰和衰减铜，铅，锌到令人满意的水平。所有测试模型的R2值均接近1。土壤和土壤混合物对重金属的吸附顺序为Pb> Cu> Zn，土壤和土壤混合物对重金属的吸附顺序为：Al-Qatif +6%石灰土> Al-Ghat +6%石灰土> Al-Qatif> Al-Ghat。石灰处理的土壤吸附73，65，和60%以上，比未经处理的土壤铅，铜，锌，分别。
Most of the chemicals containing non-biodegradable metal pollutants from anthropogenic sources are highly mobile in nature. The only way to contain or limit their movement is through sorption and entrapment in the soil matrices. In this study, the sorptive response of the three most commonly found divalent metal contaminants, copper (Cu+2), lead (Pb+2), and zinc (Zn+2), are studied using two locally available semi-arid soils from Saudi Arabia. To enhance their retention capacity, these soils are amended with lime. The response to sorption at varying initial contaminant concentrations, pH conditions, temperature levels, and dilution ratios are investigated. Relying on empirical models (Langmuir and Freundlich), the nature of sorption (monolayer or heterogeneous) is ascertained. Further, kinetic models are employed to validate the type and nature of sorption that occurs (whether pseudo first-order or second-order). It is found that the experimental results correlate well with these empirical models for both the Al-Ghat and Al-Qatif soils when amended with lime and attenuate Cu, Pb, and Zn to satisfactory levels. TheR2values are close to 1 for all the tested models. The order of sorption was Pb > Cu > Zn for these heavy metals, and also for soils and soil mixtures that were considered: Al-Qatif soil amended with 6 % lime > Al-Ghat soil with 6 % lime > Al-Qatif > Al-Ghat. Lime-treated soils sorbed 73, 65, and 60 % more than the untreated soils for Pb, Cu, and Zn, respectively.