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Sorption of Cu(II), Zn(II) and Ni(II) from aqueous solution using activated carbon prepared from olive stone waste

机译:使用橄榄石废料制备的活性炭从水溶液中吸附Cu(II),Zn(II)和Ni(II)

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The performance of olive stone activated carbon (OSAC) for sorption of Cu2+, Zn2+ and Ni2+ ions was investigated via batch technique. OSAC materials were prepared under different physially activation conditions. Olive stone waste was physically activated with N2 gas and steam gas at 900oC at 3.5h hold time (OSAC-3) was choice as the best one for Cu2+, Zn2+ and Ni2+ removal. Characterization for OSAC-3 were performed under BET-surface area, SEM, density and FTIR-spectrum. Optimum adsorption conditions were specified as a function of agitation time, initial metal concentration, pH and temperature. Kinetic results were found to be fast and described well by the pseudo-second order model. The adsorption capacities are 25.38mg/g (Cu2+), 16.95mg/g (Zn2+) and 14.65mg/g (Ni2+) which followed the sequence Cu2+ > Zn2+ > Ni2+. Spontaneous adsorption for all the studied cations, endothermic nature for both Zn2+ and Ni2+ ions and exothermic nature for Cu2+ ions were obtained. The results showed that OSAC-3 is a good economical material for Cu2+, Zn2+ and Ni2+ remediation from weakly acidic contaminated effluents.
机译:通过分批技术研究了橄榄石活性炭(OSAC)吸附Cu2 +,Zn2 +和Ni2 +离子的性能。 OSAC材料是在不同的物理活化条件下制备的。橄榄石废料通过N2气体进行物理活化,并且在900oC的蒸汽中保持3.5h(OSAC-3)是去除Cu2 +,Zn2 +和Ni2 +的最佳方法。 OSAC-3的表征在BET表面积,SEM,密度和FTIR光谱下进行。根据搅拌时间,初始金属浓度,pH和温度确定最佳的吸附条件。发现动力学结果很快,并且通过伪二级模型可以很好地描述。吸附容量为25.38mg / g(Cu2 +),16.95mg / g(Zn2 +)和14.65mg / g(Ni2 +),其吸附顺序为Cu2 +> Zn2 +> Ni2 +。获得了所有所研究阳离子的自发吸附,Zn2 +和Ni2 +离子的吸热特性以及Cu2 +离子的放热特性。结果表明,OSAC-3是用于弱酸性污染废水中Cu2 +,Zn2 +和Ni2 +修复的一种经济的材料。

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