改性生物炭去除地下水中2,4-二氯苯酚的效能研究

Efficiency research on removal of 2,4-dichlorophenol from groundwater by modified biochar

针对地下水环境中的2,4-二氯苯酚(2,4-DCP)污染,制备了具有高效吸附和催化能力的氮硫共掺杂生物炭(S,N-BC)材料。相比于原始BC催化剂,S,N-BC催化剂具有丰富且均匀的孔隙结构、较高的比表面(比表面积可达980.824 m^(2)/g)、较大的I_(D)/I_(G)(0.84)值和丰富的表面官能团。吸附实验和降解实验表明S,N-BC具有良好的吸附能力与较好的活化过一硫酸盐的能力,在10 min内,2,4-DCP去除效率为94.19%,其降解过程符合一级动力学模型,条件实验证明S,N-BC/PMS体系具有良好的抗干扰能力。淬灭实验表明,2,4-DCP的降解过程遵循以超氧为主导的非自由基氧化途径,为氮硫掺杂的生物炭在吸附和催化PMS去除地下水中有机物提供理论依据。

Aiming at the pollution of 2,4 dichlorophenol(2,4-DCP)in groundwater environment,nitrogen sulfur co-doped biochar(S,N-BC)materials with high adsorption and catalytic capacity were prepared in this study.Compared with the original BC catalyst,the S,N-BC catalyst has rich and uniform pore structure,higher specific surface(up to 980.824 m^(2)/g),larger I_(D)/I_(G)(0.84),and abundant surface functional groups.Adsorption and degradation experiments show that the S,N-BC has good adsorption capacity and better ability to activate peroxymonosulfate.Within 10 minutes,the removal efficiency of 2,4-DCP is 94.19%.Its degradation process conforms to the first-order kinetic model.Conditional experiments show that the S,N-BC/PMS system has good anti-interference ability.Quenching experiments show that the degradation process of 2,4-DCP follows a non free radical oxidation pathway dominated by superoxide.It provides a theoretical basis for the adsorption and catalytic removal of organic matter in groundwater by nitrogen sulfur doped biochar.