Release of vanadium(V)from industry has threatened the environment and human health.In this paper,a removal method of vanadium(V)is proposed using a by-product of the yellow phosphorus industry(phosphorus-iron)as a re...Release of vanadium(V)from industry has threatened the environment and human health.In this paper,a removal method of vanadium(V)is proposed using a by-product of the yellow phosphorus industry(phosphorus-iron)as a reducing agent.The thermodynamics analysis shows that the Gibbs free energy is always negative from 0 to 100℃,indicating a spontaneous process.Effect of the phosphorus-iron slag/sulfuric acid dosage and temperature on the removal efficiency is comprehensively studied,and the kinetics parameters are calculated based on a quasi-first order reaction kinetics model.Results indicate that vanadium(V)can be entirely reduced by using phosphorus-iron slag,the frequency factor and apparent activation energy are 3.23×10^(9)min^(-1)and 64.50 kJ.mol^(-1) for vanadium(V)reduction.Based on above results,a lab-scale reactor is constructed and achieves a removal efficiency of~100%and a treatment capacity of 200 ml vanadium(V)solution(2 g.L^(-1))within 3 h.This work demonstrates the feasibility of vanadium(V)reduction using phosphorus-iron slag as a reducing agent in applications.展开更多
基金supported by the National Natural Science Foundation for Young Scientists of China(22108185,51906168,52276208).
文摘Release of vanadium(V)from industry has threatened the environment and human health.In this paper,a removal method of vanadium(V)is proposed using a by-product of the yellow phosphorus industry(phosphorus-iron)as a reducing agent.The thermodynamics analysis shows that the Gibbs free energy is always negative from 0 to 100℃,indicating a spontaneous process.Effect of the phosphorus-iron slag/sulfuric acid dosage and temperature on the removal efficiency is comprehensively studied,and the kinetics parameters are calculated based on a quasi-first order reaction kinetics model.Results indicate that vanadium(V)can be entirely reduced by using phosphorus-iron slag,the frequency factor and apparent activation energy are 3.23×10^(9)min^(-1)and 64.50 kJ.mol^(-1) for vanadium(V)reduction.Based on above results,a lab-scale reactor is constructed and achieves a removal efficiency of~100%and a treatment capacity of 200 ml vanadium(V)solution(2 g.L^(-1))within 3 h.This work demonstrates the feasibility of vanadium(V)reduction using phosphorus-iron slag as a reducing agent in applications.
