Efficient removal of Cr(VI) from aqueous solution by natural pyrite/rhodochrosite derived materials: Performance,kinetic and mechanism |
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Affiliation: | 1. School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China;2. State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China |
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Abstract: | 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. |
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Keywords: | Cr(VI) removal Pyrite Rhodochrosite Thermodynamic study Electrochemical analysis |
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