Núñez Dariela, Serrano Jon Ander, Mancisidor Aritz, Elgueta Elizabeth, Varaprasad Kokkarachedu, Oyarzún Patricio, Cáceres Rodrigo, Ide Walther, Rivas Bernabé L
Centro de Investigación de Polímeros Avanzados, CIPA Avenida Collao 1202, Edificio de Laboratorios Concepción Chile
Facultad de Ingeniería y Tecnología, Universidad San Sebastián Lientur 1457 Concepción 4080871 Chile.
RSC Adv. 2019 Jul 24;9(40):22883-22890. doi: 10.1039/c9ra04198b. eCollection 2019 Jul 23.
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 for Pb(ii), Cd(ii), and Cu(ii), respectively. In addition, an adsorption capacity of 42.5 mg g 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.
采用湿化学沉淀法，以蛤壳（CS）废料为原料合成了羟基磷灰石（HA）。对制备的羟基磷灰石进行扫描电子显微镜（SEM）和透射电子显微镜（TEM）观察，发现存在棒状纳米晶体，而X射线衍射（XRD）和能谱分析（EDS）证实了羟基磷灰石分子的特征图谱。随后，将该材料用作吸附剂，通过分批和柱平衡程序从水溶液中去除重金属。在分批研究中，在pH值为5时获得了更高的吸附效率，对Pb（II）、Cd（II）和Cu（II）的最高吸附容量分别为265、64和55 mg/g。此外，使用填充有CS-HA的固定床柱，以Pb（II）溶液为进料，测定吸附容量为42.5 mg/g。最后，用托马斯模型拟合穿透曲线，以预测柱行为并进行放大。
