Activation of persulfate with carnallite-modified biochar for remediation of organic-contaminated soil
The development of efficient and environmentally friendly heterogeneous catalysts has been a challenging and hot topic in the research of persulfate(PS)oxidation technology,widely applied for the remediation of soil contaminated with organic pollutants.The natural mineral carnallite(CA)alone cannot effectively activate PS,but when loaded onto biochar to form the composite catalyst CA-CS,it significantly enhanced the catalytic performance of biochar.The research findings indicated that the optimal addition amount of CA-CS was equivalent to 0.5％of the soil mass,with the best PS concentration at 10 mmol·L-1 and reaction time for 12 h,resulting in a degradation rate of 94.1％for phenol in soil under these conditions.Quenching experiments and electrochemical characterization demonstrated that phenol,CA-CS,and PS formed a ternary complex system of electron donor-electron mediator-electron acceptor.Under the catalytic action of CA-CS,PS could more efficiently extract electrons from phenol and degrade it through an electron transfer pathway.Additionally,the particle size of the soil significantly decreased after oxidation,while the chemical composition of remained soil relatively unchanged.It aims to provide an efficient and environmentally friendly heterogeneous catalyst for the remediation of organic polluted soil in practical engineering applications.
organic-contaminated soilsoil column experimentpersulfatebiocharelectron transfer
万方数据
维普
