Copper is toxic and is considered as the hazardous pollutant due to his stability in the environment. Current technologies used for its removal involve materials which can be difficult to synthesize, are expensive or are themselves potentially toxic. Natural clays are abundant worldwide, relatively cheap, possess sorption and ion exchange properties, are candidates as adsorbents. While the Cu(II) sorption capacity of raw bentonite is relatively low, modified bentonites represent a new class of sorbents for effective Cu(II) removal from wastewater. The present study investigates the influence of Algerian clay modification on the capacity of copper removal from water. This montmorillonite, which is a clay mineral of the smectite group, possesses silica tetrahedral sheets layered between alumina octahedral sheets. Several adsorbents were prepared from this bentonite by saturation with sodium, calcium and treatment with sulphuric acid to produce three adsorbents, ARS, ARC and ARH, respectively. The three materials obtained were tested for the Cu(II) adsorption from aqueous solutions. The adsorbents and metal interactions were studied under different conditions of interaction time, pH, concentration of metal ions and amount of clay. It was found that the interactions were dependent on pH, the uptake of pollutant was controlled by the amount of clay and the initial copper concentration. Langmuir and Freundlich models were fitted to experimental isotherms. The Langmuir model shows a better fit to the Cu ions adsorption isotherm for all systems. The largest adsorption capacity is observed for sodium homoionic clay. The Langmuir maximum sorption capacity of Cu(II) ions on ARH, ARC and ARS was found to be 17.241, 18.181 and 24.390 mg/g, respectively. The three adsorbents also showed a high efficiency in the Cu(II) adsorption from much diluted solutions. This work suggested that the modified clays can be promising candidates for the removal of copper ions from aqueous solutions.

中文翻译：

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经济环保型改性粘土的制备及其在除铜中的应用

铜具有毒性，由于其在环境中的稳定性而被认为是有害污染物。用于去除它的当前技术涉及可能难以合成，昂贵或本身具有潜在毒性的材料。天然粘土在世界范围内是丰富的，相对便宜，具有吸附和离子交换特性，是候选的吸附剂。尽管原始膨润土对Cu（II）的吸附能力相对较低，但改性膨润土代表了一类新型的吸附剂，可有效地去除废水中的Cu（II）。本研究调查了阿尔及利亚粘土改性对水中铜去除能力的影响。该蒙脱石是蒙脱石族的粘土矿物，具有在氧化铝八面体片之间层叠的二氧化硅四面体片。通过用钠，钙饱和并用硫酸处理从该膨润土制备几种吸附剂，以分别生产三种吸附剂，ARS，ARC和ARH。测试了获得的三种材料对水溶液中Cu（II）的吸附。在不同的相互作用时间，pH，金属离子浓度和黏土用量条件下研究了吸附剂和金属的相互作用。发现相互作用取决于pH，污染物的吸收受粘土量和初始铜浓度的控制。Langmuir和Freundlich模型适合实验等温线。Langmuir模型显示出对所有系统的Cu离子吸附等温线的更好拟合。对于钠均离子粘土观察到最大的吸附容量。兰格缪尔对Cu（II）离子在ARH，ARC和ARS上的最大吸附能力分别为17.241、18.181和24.390 mg / g。三种吸附剂还显示出从大量稀释溶液中吸附Cu（II）的高效率。这项工作表明，改性粘土可能是从水溶液中去除铜离子的有前途的候选者。