title: Heterogeneous Fenton oxidation of Direct Black G in dye effluent using functional kaolin-supported nanoscale zero iron.
abstract: This study investigated kaolin-supported nanoscale zero-valent iron (nZVI/K) as a heterogeneous Fenton-like catalyst for the adsorption and oxidation of an azo dye, Direct Black G (DBG). New findings suggest that kaolin as a support material not only reduced the aggregation of nanoscale zero-valent iron (nZVI) but also improved the adsorption of DBG. It consequently improved Fenton oxidation by increasing the local concentration of DBG in the vicinity of nZVI. This was confirmed by scanning electron microscopy and X-ray diffraction for the surface morphology of nZVI/K before and after the Fenton-like reaction. Furthermore, nZVI/K proved to be a catalyst for the heterogeneous Fenton-like oxidation of the DBG process in the neutral pH range. More than 87.22 % of DBG was degraded, and 54.60 % of total organic carbon was removed in the optimal conditions: 0.6 g/L dosage of nZVI/K, 33 mM H2O2, 100 mg/L initial DBG concentration, temperature of 303 K and pH of 7.06. Finally, it was demonstrated that nZVI/K removed DBG from dye wastewater through the processes of adsorption and oxidation.
authors.affiliation: School of Environmental Science and Technology, Fujian Normal University, Fuzhou, 350007, Fujian Province, China.|Cooperative Research Centre for Contamination Assessment and Remediation of Environments, Mawson Lakes, Adelaide, SA, 5095, Australia.
authors.forename: Xinwen
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Environmental Science and Technology, Fujian Normal University, Fuzhou, 350007, Fujian Province, China.|Cooperative Research Centre for Contamination Assessment and Remediation of Environments, Mawson Lakes, Adelaide, SA, 5095, Australia.
authors.forename: Feifeng
authors.initials: F
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Technology, Fujian Normal University, Fuzhou, 350007, Fujian Province, China. zlchen@fjnu.edu.cn.|Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia. zlchen@fjnu.edu.cn.|Cooperative Research Centre for Contamination Assessment and Remediation of Environments, Mawson Lakes, Adelaide, SA, 5095, Australia. zlchen@fjnu.edu.cn.
authors.forename: Zuliang
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia.|Cooperative Research Centre for Contamination Assessment and Remediation of Environments, Mawson Lakes, Adelaide, SA, 5095, Australia.
authors.forename: Mallavarapu
authors.initials: M
authors.lastname: Megharaj
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia.|Cooperative Research Centre for Contamination Assessment and Remediation of Environments, Mawson Lakes, Adelaide, SA, 5095, Australia.
authors.forename: Ravendra
authors.initials: R
authors.lastname: Naidu
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000032:analysis / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007616:Kaolin / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D004396:Coloring Agents; D006861:Hydrogen Peroxide; D007501:Iron; D007616:Kaolin; D062065:Wastewater; D014874:Water Pollutants, Chemical