Journal
RSC ADVANCES
Volume 9, Issue 57, Pages 33486-33496Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra06978j
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Funding
- Zhaoqing Science and Technology Project [2018N006]
- Key Project of the Joint Fund Between the State Fund Committee and Shandong Province [U1806210]
- National Key R&D Program of China [2017YFB0310801]
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In this study, a granular red mud supported zero-valent iron (ZVI@GRM) was successfully prepared and was used to remove Pb(ii) and Cr(vi) from aqueous solution. Zero-valent iron (ZVI) was synthesized by direct reduction of iron oxide in red mud by maize straw as a reductant at 900 degrees C in an anoxic atmosphere. The technical characterization (SEM, EDS, XRD, FTIR and BET) revealed that ZVI@GRM was loaded with zero-valent iron and contained different size pores. The factors of adsorption experiments include initial concentration, contact time, pH and temperature. The Pb(ii) and Cr(vi) removal by ZVI@GRM well fitted the pseudo-second-order kinetics model and the removal of heavy metals was an endothermic process. Essentially, Pb(ii) was transformed to precipitate forms (Pb-0, Pb (OH)(2), or 2PbCO(3).Pb (OH)(2)) and Cr(vi) was converted to Cr (OH)(3) or Cr3+/Fe3+ hydroxides. The maximum removal capacity for Pb(ii) and Cr(vi) by ZVI@GRM was 149.42 and 37.14 mg g(-1). ZVI@GRM was a low-cost material and had outstanding performance and great potential in wastewater treatment.
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