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Waste Brick Dust as Potential Sorbent of Lead and Cesium from Contaminated Water

机译：废砖粉作为污水中铅和铯的潜在吸附剂

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Adsorption properties of waste brick dust (WBD) were studied by the removing of PbII and CsI from an aqueous system. For adsorption experiments, 0.1 M and 0.5 M aqueous solutions of Cs+ and Pb2+ and two WBD (Libochovice—LB, and Tyn nad Vltavou—TN) in the fraction below 125 µm were used. The structural and surface properties of WBD were characterized by X-ray diffraction (XRD) in combination with solid-state nuclear magnetic resonance (NMR), supplemented by scanning electron microscopy (SEM), specific surface area (SBET), total pore volume and zero point of charge (pHZPC). LB was a more amorphous material showing a better adsorption condition than that of TN. The adsorption process indicated better results for Pb2+, due to the inner-sphere surface complexation in all Pb2+ systems, supported by the formation of insoluble Pb(OH)2 precipitation on the sorbent surface. A weak adsorption of Cs+ on WBD corresponded to the non-Langmuir adsorption run followed by the outer-sphere surface complexation. The leachability of Pb2+ from saturated WBDs varied from 0.001% to 0.3%, while in the case of Cs+, 4% to 12% of the initial amount was leached. Both LB and TN met the standards for PbII adsorption, yet completely failed for any CsI removal from water systems.
机译：通过从水性体系中去除Pb II 和Cs I 来研究废砖粉尘（WBD）的吸附性能。为了进行吸附实验，在级分中分别加入0.1 M和0.5 M的Cs + 和Pb 2 + 水溶液和两个WBD（Libochovice-LB和Tyn nad Vltavou-TN）使用低于125 µm的材料。 WBD的结构和表面性能通过X射线衍射（XRD）结合固态核磁共振（NMR）进行表征，并辅以扫描电子显微镜（SEM），比表面积（SBET），总孔体积和零充电点（pHZPC）。 LB是一种较无定形的材料，显示出比TN更好的吸附条件。吸附过程表明Pb 2 + 的吸附效果更好，这是由于所有Pb 2 + 系统的内球表面络合以及不溶性Pb（OH）的形成2在吸附剂表面沉淀。 WBD上Cs + 的弱吸附对应于非朗格缪尔吸附运行，然后是外球面络合。从饱和WBD浸出的Pb 2 + 的可浸性在0.001％至0.3％之间，而在Cs + 的情况下，浸出量为初始量的4％至12％ 。 LB和TN都符合Pb II 的吸附标准，但是从水系统中去除Cs I 的方法完全失败。

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