Advanced Powder Technology ( IF 5.2 ) Pub Date : 2021-09-04 , DOI: 10.1016/j.apt.2021.08.032 Yaozong Chen 1 , Min Gan 1 , Peng He 1 , Ke Zhang 1 , Xu Wang 1 , Jinglei Zhu 1 , Mengfei Liu 1 , Fang Chen 1 , Jianyu Zhu 1 , Nengwen Xiao 2
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 long-term 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.
中文翻译:
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
在这项工作中,系统地研究和评估了由天然黄铁矿和菱锰矿合成的黄铁矿/菱锰矿 (Py x Rh y ) 复合材料,用于修复含 Cr(VI) 的废水。结果表明,黄铁矿/菱锰矿 (1:1) 表现出最佳的 Cr(VI) 去除性能。XRD 表明,MnS 和磁黄铁矿的出现有助于显着提高 Cr(VI) 还原率。在 pH 值为 6、温度为 303.15 k 时,估计的最大吸附容量为 95.58 mg/g,比其他铁和锰基材料大。此外,热力学研究表明 Py 1 Rh 1去除 Cr(VI)是一个自发的吸热过程。Taffel 曲线和EIS 结果分别显示出更高的腐蚀电流和更低的Py 1 Rh 1电阻,这对电子转移更有利。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。我们的研究结果证明了天然黄铁矿和菱锰矿合成材料在修复 Cr(VI) 污染水体方面的巨大潜力。