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首页> 外文期刊>Arabian Journal for Science and Engineering >A New Highly Efficient Algerian Clay for the Removal of HeavyMetals of Cu(Ⅱ) and Pb(Ⅱ) from Aqueous Solutions: Characterization, Fractal, Kinetics, and Isotherm Analysis
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A New Highly Efficient Algerian Clay for the Removal of HeavyMetals of Cu(Ⅱ) and Pb(Ⅱ) from Aqueous Solutions: Characterization, Fractal, Kinetics, and Isotherm Analysis

机译：一种从水溶液中去除重金属Cu（Ⅱ）和Pb（Ⅱ）的新型高效阿尔及利亚粘土：表征，分形，动力学和等温线分析

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摘要

Aphysicochemical characterization, the irregularity of the surface quantified by the fractal dimension (D_S), and the adsorptionof copper (Cu(Ⅱ)) and lead (Pb(Ⅱ)) of a kaolin clay from aqueous solutions were studied. In addition, the effects of temperature,contact time, pH of solution, and clay mass on copper Cu(Ⅱ) and Pb(Ⅱ) adsorption were investigated. In this work, X-rayfluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy were applied to study the composition andstructure of the clay studied. The Brunauer–Emmett–Teller theory and the t-plot method were used to calculate the specificsurface and porosity, respectively. The fractal analysis showed that the material has an irregular surface, with a very complexpore structure. This material has a very high adsorption capacity, which exceeds 97.5% and 99.95% for Cu(Ⅱ) an Pb(Ⅱ),respectively, for all concentrations under normal conditions of pHand temperature (pH7, T 25 ℃). Themaximum adsorptioncapacity calculated by the Langmuir model was 52.63 mg g~(−1) for copper (Cu). For lead (Pb) ions, the maximum capacity was57.30 mg g~(−1). The adsorption process was rapid, as equilibrium was achieved within 10 min for copper at 25 and 50 mg L~(−1)and within 30 min at 100 mg L~(−1). For lead (Pb) ions, equilibrium was achieved within the first minute at all concentrations.The kaolin clay has a better affinity for Pb(Ⅱ) than Cu(Ⅱ). The Temkin model showed better correlation with the experimentaldata for this material. The kinetic study demonstrated that Pb(Ⅱ) and Cu(Ⅱ) adsorption on kaolin was in a good accordancewith the pseudo-second-order kinetic model.
机译：研究了分形维数（D_S）量化表面的不规则性，以及高岭土在水溶液中对铜（Cu（Ⅱ））和铅（Pb（Ⅱ））的吸附。此外，研究了温度，接触时间，溶液的pH值和黏土质量对Cu（Ⅱ）和Pb（Ⅱ）铜吸附的影响。在这项工作中，X射线荧光，X射线衍射和傅里叶变换红外光谱被用来研究所研究的粘土的组成和结构。 Brunauer-Emmett-Teller理论和t绘图方法分别用于计算比表面积和孔隙率。分形分析表明该材料具有不规则表面，具有非常复杂的孔结构。该材料具有很高的吸附容量，在正常pH和温度（pH7，T 25℃）下，所有浓度的Cu（Ⅱ）和Pb（Ⅱ）的吸附量分别超过97.5％和99.95％。由Langmuir模型计算得出的最大吸附容量为52.63 mg g〜（-1）对铜（Cu）。对于铅（Pb）离子，最大容量为57.30 mg g〜（-1）。吸附过程很快，因为铜在25和50 mg L〜（-1）下在10分钟内达到平衡，而在100 mg L〜（-1）下在30分钟内达到平衡。对于铅（Pb）离子，所有浓度在第一分钟内就达到了平衡。高岭土对Pb（Ⅱ）的亲和力比Cu（Ⅱ）好。 Temkin模型显示出与该材料的实验数据更好的相关性。动力学研究表明，Pb（Ⅱ）和Cu（Ⅱ）在高岭土上的吸附符合拟二级动力学模型。

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