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Investigation on the efficient separation and recovery of Se(IV) and Se(VI) from wastewater using Fe–OOH–bent
Radiochimica Acta ( IF 1.4 ) Pub Date : 2021-05-01 , DOI: 10.1515/ract-2020-0087
Junqiang Yang 1 , Yawen Chen 1 , Juan Tong 1 , Yin Su 1 , Xiaoqing Gao 1, 2 , Jiangang He 1 , Keliang Shi 1, 3 , Xiaolin Hou 1, 4 , Wangsuo Wu 1, 3
Affiliation  

Decontamination of the toxic selenium compound, selenite (Se(IV)) and selenate (Se(VI)), from wastewater is imperative for environmental protection. Efficient approaches to remove Se(IV) and Se(VI) are in urgent needs. In this work, an accessible adsorbent Fe–OOH–bent was prepared and applied for the removal of Se(IV) and Se(VI) from wastewater. The batch experimental results demonstrate that Fe–OOH–bent exhibits high adsorption capacities of 5.01 × 10 −4 and 2.28 × 10 −4 mol/g for Se(IV) and Se(VI) respectively, which are higher than most of the reported bentonite based materials, especially in the case of Se(VI). Moreover, the Fe–OOH–bent displayed superior selectivity towards Se(IV) and Se(VI) even in the presence of excess competitive anions (Cl − , HCO 3 − , NO 3 − , SO 4 2− and PO 4 3− ) and HA with concentrations of 1000 times higher than Se(IV) and Se(VI). By evaluating the adsorption ratio of Se(IV) and Se(VI), the reusability of Fe–OOH–bent was great through five adsorption-desorption cycles. For practical application, the column experiments were performed with simulated wastewater samples. The breakthrough and eluting curves of Se(IV) and Se(VI) were investigated through the columns packed with Fe–OOH–bent, and the results show that Se(IV) and Se(VI) can be successfully separated and recovered using 0.1 mol/L Na 2 SO 4 (pH = 9.0) and 0.1 mol/L Na 3 PO 4 (pH = 9.0), respectively. Our work provides a new approach for fractional separation as well as the recovery of Se(IV) and Se(VI) from wastewater.

中文翻译:

Fe-OOH-bent从废水中有效分离和回收Se(IV)和Se(VI)的研究

为了保护环境,必须对废水中的有毒硒化合物亚硒酸盐(Se(IV))和硒酸盐(Se(VI))进行净化。迫切需要有效的去除硒(IV)和硒(VI)的方法。在这项工作中,制备了易接近的Fe-OOH吸附剂,并将其用于去除废水中的Se(IV)和Se(VI)。批量实验结果表明,Fe – OOH –弯曲物对Se(IV)和Se(VI)的吸附容量分别为5.01×10 -4和2.28×10 -4 mol / g,高于大多数报道的吸附量。膨润土基材料,尤其是在Se(VI)的情况下。而且,即使存在过量竞争性阴离子(Cl-,HCO 3-,NO 3-,SO 4 2-和PO 4 3-)和HA的浓度比Se(IV)和Se(VI)高1000倍。通过评估Se(IV)和Se(VI)的吸附比,经过五个吸附-解吸循环,Fe-OOH-弯曲的重用性很高。对于实际应用,使用模拟废水样品进行了柱实验。通过填充Fe-OOH-弯曲的色谱柱研究了Se(IV)和Se(VI)的穿透和洗脱曲线,结果表明,使用0.1可以成功分离和回收Se(IV)和Se(VI) mol / L Na 2 SO 4(pH = 9.0)和0.1 mol / L Na 3 PO 4(pH = 9.0)。我们的工作为分离分离以及从废水中回收Se(IV)和Se(VI)提供了一种新方法。通过五个吸附-解吸循环,Fe – OOH –弯曲的可重复使用性极高。对于实际应用,使用模拟废水样品进行了柱实验。通过填充Fe-OOH-弯曲的色谱柱研究了Se(IV)和Se(VI)的穿透和洗脱曲线,结果表明,使用0.1可以成功分离和回收Se(IV)和Se(VI) mol / L Na 2 SO 4(pH = 9.0)和0.1 mol / L Na 3 PO 4(pH = 9.0)。我们的工作为分离分离以及从废水中回收Se(IV)和Se(VI)提供了一种新方法。通过五个吸附-解吸循环,Fe – OOH –弯曲的可重复使用性极高。对于实际应用,使用模拟废水样品进行了柱实验。通过填充Fe-OOH-弯曲的色谱柱研究了Se(IV)和Se(VI)的穿透和洗脱曲线,结果表明,使用0.1可以成功分离和回收Se(IV)和Se(VI) mol / L Na 2 SO 4(pH = 9.0)和0.1 mol / L Na 3 PO 4(pH = 9.0)。我们的工作为分离分离以及从废水中回收Se(IV)和Se(VI)提供了一种新方法。通过填充Fe-OOH-弯曲的色谱柱研究了Se(IV)和Se(VI)的穿透和洗脱曲线,结果表明,使用0.1可以成功分离和回收Se(IV)和Se(VI) mol / L Na 2 SO 4(pH = 9.0)和0.1 mol / L Na 3 PO 4(pH = 9.0)。我们的工作为分离分离以及从废水中回收Se(IV)和Se(VI)提供了一种新方法。通过Fe-OOH-弯曲填充柱研究了Se(IV)和Se(VI)的穿透和洗脱曲线,结果表明,使用0.1可以成功分离和回收Se(IV)和Se(VI) mol / L Na 2 SO 4(pH = 9.0)和0.1 mol / L Na 3 PO 4(pH = 9.0)。我们的工作为分离分离以及从废水中回收Se(IV)和Se(VI)提供了一种新方法。
更新日期:2021-04-29
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