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Heavy metal removal from aqueous systems using hydroxyapatite nanocrystals derived from clam shells

机译:使用衍生自蛤壳的羟基磷灰石纳米晶体中的含水体系中的重金属去除

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摘要

Hydroxyapatite (HA) was synthesized by wet chemical precipitation, using clam shell (CS) waste as feedstock. SEM and TEM observation of the produced hydroxyapatite revealed the presence of rod-shaped nanocrystals, while XRD and EDS analyses confirmed the characteristic patterns of hydroxyapatite molecules. This material was subsequently employed as a sorbent for heavy metal removal from aqueous solutions, both in batch and column equilibrium procedures. In batch studies, higher sorption efficiencies were obtained at pH 5, with the highest adsorption capacities of 265, 64, and 55 mg g(-1) for Pb(ii), Cd(ii), and Cu(ii), respectively. In addition, an adsorption capacity of 42.5 mg g(-1) was determined using a CS-HA packed bed column fed with a solution of Pb(ii). Finally, the breakthrough curve was fitted with Thomas model in order to predict column behavior and scaling up.
机译:通过湿化学沉淀合成羟基磷灰石(HA),使用蛤壳(CS)废物作为原料。 所生产的羟基磷灰石的SEM和TEM观察显示出棒状纳米晶体的存在,而XRD和EDS分析证实了羟基磷灰石分子的特征模式。 随后使用该材料作为吸附剂,其用于分批和柱平衡程序的水溶液中的重金属去除。 在分批研究中,在pH 5处获得更高的吸附效率,PB(II),CD(II)和Cu(II)的最高吸附容量为265,64和55mg(-1)。 另外,使用用Pb(II)溶液供给的Cs-HA填充床柱测定42.5mg g(-1)的吸附容量。 最后,突破曲线配有托马斯模型,以预测列行为和缩放。

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