Efficient removal of Cr(VI) from aqueous solution by natural pyrite/rhodochrosite derived materials: Performance, kinetic and mechanism
Efficient removal of Cr(VI) from aqueous solution by natural pyrite/rhodochrosite derived materials: Performance, kinetic and mechanism
复制标题
天然黄铁矿/菱锰矿衍生材料从水溶液中有效去除 Cr(VI)：性能、动力学和机理
DOI：
10.1016/j.apt.2021.08.032
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发表时间：
2021-09-30
影响因子：
5.2
通讯作者：
Xiao, Nengwen
中科院分区：
文献类型：
--
作者：
Chen, Yaozong;Gan, Min;Xiao, Nengwen
以天然黄铁矿和菱锰矿为原料合成了黄铁矿/菱锰矿（PyxRhy）复合材料，并对其处理含Cr（VI）废水进行了系统的研究和评价。结果表明，黄铁矿/菱锰矿（1：1）对Cr（VI）的去除效果最好。XRD分析表明，MnS和磁黄铁矿的出现有助于Cr（VI）还原率的显著提高。在pH值为6，温度为303.15 K时，该材料的最大吸附容量为95.58 mg/g，比其它铁锰基材料的吸附容量大。热力学研究表明，Py 1 Rh 1对Cr（VI）的去除是一个自发的吸热过程. Taffel曲线和EIS结果表明，Py 1 Rh 1的腐蚀电流较大，电阻较低，更有利于电子转移。=Fe（II）和=Mn（II）的表面循环再生为Cr（VI）还原提供了长期的电子转移。研究结果表明，天然黄铁矿和菱锰矿合成材料在修复Cr（VI）污染水体中具有巨大的潜力。(C)2021年日本粉末技术学会。由Elsevier B. V.和日本粉末技术协会出版。All rights reserved.
In this work, pyrite/rhodochrosite (PyxRhy) composite synthesized from natural pyrite and rhodochrosite to remediate Cr(VI) containing wastewater was systematically investigated and evaluated. Results show that pyrite/rhodochrosite (1:1) showed the best Cr(VI) removal performance. XRD showed that emergence of MnS and pyrrhotite contributed to a significant increasing Cr(VI) reduction rate. The estimated maximum adsorption capacity was 95.58 mg/g at pH value of 6, temperature of 303.15 k, which was larger than other iron and manganese-based materials. Additionally, thermodynamic study illuminated that Cr(VI) removal by Py1Rh1 was a spontaneous and endothermic process. Taffel curve and EIS result presented higher corrosion current and lower electrical resistance for Py1Rh1, respectively, which was more favorable for the electron transfer. The surface cyclic regeneration of =Fe(II) and =Mn(II) provided longterm electron transfer to the Cr(VI) reduction. Our results demonstrated the great potentials of natural pyrite and rhodochrosite synthetic materials in the remediation of Cr(VI) polluted water. (C) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.