Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 2, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.107140
Keywords
Nano-iron-carbon composites; Carbothermal synthesis; High arsenic-containing strongly acidic wastewater; Two-stage treatment; Multiple mechanisms
Categories
Funding
- Natural Science Foundation of Science and Technology Department of Anhui Province [2008085QE242]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [ES201917]
- Engineering Research Center of biomembrane water purification and utilization technology [BWPU2020KF08]
- Key project of Natural Science Foundation of Anhui Provincial department of education [KJ2019A0056]
- National Natural Science Foundation of China [52000156]
- natural science foundation youth program of Anhui University Of Technology [QZ201813]
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In this study, nano-iron-carbon composites (CB-nZVI) were synthesized efficiently and in large quantities, demonstrating rapid and efficient removal of As(V) from high-arsenic acid wastewater. CB-nZVI showed great potential for the disposal of strongly acidic wastewater in the smelting industry.
The current carbothermal method involves impregnation and reduction of ferric salt with the problems of low product activity and high cost, limiting the large-scale production and application of nano-zero-valent iron (nZVI). In this work, the nano-iron-carbon composites (CB-nZVI) were successfully synthesized at a high efficiency, low consumption and batch production process and showed a rapid and efficient As(V) removal from high-arsenic acid wastewater (pH 2 and As(V) 5 g/L). More than 99.77% As(V) was removed by CB-nZVI under optimum reaction conditions of pH 1.7, initial As(V) concentration 5 g/L and nZVI dosage 11 g/L at 40 celcius with approximately 11 mg/L As(V) still remained in the filtrate. A novel continuous two-stage treatment process was proposed with only 0.12 mg/L As(V) remained in the filtrate, which met the demands specified in Emission Standard of Pollutants for the Sulfuric Acid Industry issued by Ministry of Environmental Protection of China (GB26132-2010), and solid wastes were greatly reduced at the same time. The iron species distributed on the CB-nZVI core-shell structure possessed a high chemical reduction potential gradient driving force which resulted in the adsorbed As(V) would further be reduced to As(III) and As(0) and then diffusing across the thin oxide layer, leading to accumulating or immobilizing the arsenic at the CB-nZVI. Moreover, strongly acidic condition and Fe/C micro-electrolysis could accelerate the corrosion of CB-nZVI and generate iron oxides for As (V) adsorption. These results suggested that CB-nZVI has great potential for the disposal of strongly acidic wastewater with high concentration in the smelting industry.
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