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首页> 外文期刊>Science of the total environment >Fast and effective arsenic removal from aqueous solutions by a novel low-cost eggshell byproduct
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Fast and effective arsenic removal from aqueous solutions by a novel low-cost eggshell byproduct

机译：通过新型低成本蛋壳副产品从水溶液中去除快速有效的砷

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摘要

Developing alternative green solutions for local and correct recycling of eggshells waste (ES) are needed by the egg-processing industries. In this study, we proposed transforming ES into a novel low-cost chemical compound named hydroxyl-eggshell (ES-OH) and investigated its capacity for arsenic (As) removal from aqueous solutions. Laboratory experiments were conducted to investigate the effects of ES-OH doses, pH, kinetics, and isotherms on As removal efficiency. The kinetics study showed that ES-OH removed nearly all As from solution in less than 15 min. The pseudo-second-order model described the process, and the maximum As removal capacity predicted by the Langmuir isotherm model was 529 mg g~(-1). Using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray detector (SEM-EDS), and X-ray diffraction (XRD), we found that the As removal mechanism by ES-OH was due to vladimirite precipitation, followed by weak electrostatic interactions between the precipitate and arsenate ions. Finally, after an economic analysis, we conclude that besides being a novel and economical income source, egg-producing companies might implement the ES-OH production process as a local environmentally-friendly way of recycling eggshells and reducing water As contamination.
机译：鸡蛋加工行业需要开发用于局部和正确回收蛋壳废物的替代绿色解决方案。在该研究中，我们提出将ES转化为名为羟基蛋壳（ES-OH）的新型低成本化合物，并研究了其砷（AS）从水溶液中除去的能力。进行实验室实验以研究ES-OH剂量，pH，动力学和等温线作为去除效率的影响。动力学研究表明，ES-OH几乎从不到15分钟的溶液中取出。伪二阶模型描述了该过程，并且Langmuir等温模型预测的最大值是529mg g〜（-1）。使用傅里叶变换红外光谱（FTIR），扫描电子显微镜与能量分散X射线检测器（SEM-EDS）和X射线衍射（XRD），我们发现作为ES-OH的作为去除机制是由于vladimirite沉淀，随后沉淀物和砷酸酯离子之间的弱静电相互作用。最后，在经济分析之后，我们得出结论，除了是一种新颖的和经济的收入来源，鸡蛋生产公司可能会将ES-OH生产过程落实作为循环蛋壳和减少污染水的当地环保方式。

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