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Adsorption/Ion Exchange of Metal ions on Clay Mineral Surfaces

机译：金属离子在粘土矿物表面的吸附/离子交换

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This research aimed to investigate the removal of metal ions,such as Al3+,Ca2+,Mn2+,eb2+ and Zn2+,by adsorption or ionexchange on clay minerals.Refined natural bentonite (Raw-bentonite),Ca2+ and Na+ ion exchanged bentonite (Ca-and Na-bentonite)and Commercial montmorillonite KSF and K10 from Sigma Aldrich,were used.The component of five inorganic clays was analyzedby XRF.And the concentration of metal ions was measured by ICP.Also,the cation exchange capacity (CEC) and the particlecharge of clay minerals were measured.The initial concentration range of metal ions was 10～100ppm.From the experimental results,it was shown that the adsorption equilibrium was obtained within 1～2hours.The maximum percentage removals of Al3+,Ca2+,Pb2+and Zn2+ on Na-bentonite was more than 98％ and that of Mn2+ was 66％.Al3+ was leached out from KSF because of increasedhydrogen ion concentration.In general,the percentage removal of metal ions was decreased with increasing of the initialconcentration of metal ions.The adsorption capacity of metal ions was in the order of Na-bentonite 》 Raw-bentonite K10 ＞ Ca-bentonite ＞ KSF.The Freundlich constant (K) of Na-bentonite was the largest for metal ions.The order K ofNa-Bentonite on metal ions was Al3+＞ Cu2+ ＞ Pb2+ ＞ Zn2+ ＞ Mn2+,and the adsorption intensity (l) was determined to be 0.2～0.39.
机译：这项研究旨在研究通过吸附或离子交换在粘土矿物上去除金属离子，如Al3 +，Ca2 +，Mn2 +，eb2 +和Zn2 +。精制天然膨润土（未加工膨润土），Ca2 +和Na +离子交换的膨润土（Ca-和分别使用Sigma Aldrich生产的钠膨润土，商业蒙脱土KSF和K10.XRF分析五种无机粘土的成分，ICP测定金属离子的浓度，以及阳离子交换容量（CEC）和颗粒电荷测量了粘土矿物的含量，金属离子的初始浓度范围为10〜100ppm。从实验结果表明，在1〜2小时内达到了吸附平衡。Al3+，Ca2 +，Pb2 +和Zn2 +的最大去除百分率。钠基膨润土的含量大于98％，Mn2 +的含量为66％。由于氢离子浓度的增加，Al3 +从KSF中析出。总体上，金属离子的去除率随着金属离子初始浓度的增加而降低。金属离子的吸附能力依次为钠膨润土》原膨润土K10＞钙膨润土＞ KSF。钠膨润土的Freundlich常数（K）对金属离子最大。在金属离子上，Al3 +＞ Cu2 +＞ Pb2 +＞ Zn2 +＞ Mn2 +，其吸附强度（l / n）为0.2〜0.39。

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