Abstract：
A novel nanocomposite consisting of Fe3O4-loaded tin oxyhydroxy-chloride is demonstrated as an efficient adsorbent for the removal of hexavalent chromium in compliance to the new drinking water regulation. This study introduces a continuous-flow production of the nanocomposite through the separate synthesis of (i) 40 nm Fe3O4 nanoparticles and (ii) multilayered spherical arrangements of a tin hydroxy-chloride identified as abhurite, before the application of a wet-blending process. The homogeneous distribution of Fe3O4 nanoparticles on the abhurite\'s morphology, features nanocomposite with magnetic response whereas the 10 % loaded nanocomposite preserves a Cr(VI) uptake capacity of 7.2 mg/g for residual concentrations below 25 μg/L. Kinetic and thermodynamic examination of the uptake evolution indicates a relative rapid Cr(VI) capture dominated by interparticle diffusion and a spontaneous endothermic process mediated by reduction to Cr(III). The efficiency of the optimized nanocomposite was validated in a pilot unit operating in a sequence of a stirring reactor and a rotary magnetic separator showing an alternative and competitive application path than typical fixed-bed filtration, which is supported by the absence of any acute cellular toxicity according to human kidney cell viability tests.
摘要：
一种由负载Fe3O4的氯氧化锡组成的新型纳米复合材料被证明是一种有效的吸附剂，可根据新的饮用水法规去除六价铬。这项研究通过单独合成（i）40nmFe3O4纳米颗粒和（ii）羟基氯化锡的多层球形排列，介绍了纳米复合材料的连续流生产。在应用湿法混合工艺之前。Fe3O4纳米粒子在abhurite形态上的均匀分布，特征是具有磁响应的纳米复合材料，而10％负载的纳米复合材料在低于25μg/L的残留浓度下保留了7.2mg/g的Cr（VI）吸收能力。吸收演化的动力学和热力学检查表明，颗粒间扩散占主导地位的Cr（VI）捕获相对较快，并且还原为Cr（III）介导的自发吸热过程。在一系列搅拌反应器和旋转磁选机中运行的中试单元中验证了优化的纳米复合材料的效率，显示出比典型的固定床过滤具有替代和竞争性的应用路径。根据人肾细胞活力测试，没有任何急性细胞毒性支持。
