Elevated efficiency in tartrazine removal from wastewater through boron-doped biochar:enhanced adsorption and persulfate activation  

作　　者：Xiaojuan Chen Yu Zhou Juhua He Suresh CPillai Ning Li Song Xu Jiesen Li Xin Chen Hailong Wang 

机构地区：[1]School of Environmental and Chemical Engineering,Foshan University,Foshan 528225,China. [2]School of Food Science and Engineering,Foshan University,Foshan 528225,China. [3]Nanotechnology Research Group,Department of Environmental Science,Faculty of Science,Institute of Technology Sligo,Ash Lane,Sligo F91 YW50,Ireland. [4]Guangdong Provincial Key Laboratory of Integrated Agro-Environmental Pollution Control and Management,Institute of Eco-Environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou 510650,China.

出　　处：《Biochar》2024年第1期1408-1429,共22页生物炭(英文)

基　　金：supported by the Natural Science Foundation of Guangdong Province,China(2023A1515030162,2022A1515010333);the Guangdong Basic and Applied Basic Research Foundation(2022A1515140122);the National Natural Science Foundation of China(42377245);Guangdong Foundation for Program of Science and Technology Research,China(2023B1212060044).

摘　　要：Boron-doped biochar(B-BC)was synthesized by pyrolysis using solid waste of sorghum straw as raw material.The specific surface area of B-BC increased significantly by 2.38 times compared to that of pure BC.This enhancement allowed B-BC(0.3 g L^(−1))to achieve complete adsorption of 10 mg L^(−1)tartrazine(TTZ)within 40 min.Moreover,acidic conditions were more favorable for TTZ adsorption,achieving complete removal of TTZ in only 15 min at a pH of 3.0.Interestingly,the adsorption rate of TTZ by B-BC in the presence of 0.05 M Cl^(-)was approximately 2.12 times higher than that in the absence of Cl^(-).When other background electrolytes were present,excluding PO_(4)^(3−),complete adsorption of TTZ could also be achieved within 60 min.Thermodynamic analysis and DFT calculations described the parameters of B-BC for TTZ adsorption,includingG(<0 kJ mol^(−1)),H(−2.199 kJ mol^(−1)),S(−6.068 J mol^(−1)K^(−1)),and the adsorption energy(E_(ads)=−0.6919 eV),indicating a tendency towards a spontaneous adsorption process.Moreover,the strong electron transfer ability of B-BC and the oxygen-containing groups promoted the activation of PDS and generation of active substances such as^(1)O_(2),O_(2)^(•−),and SO_(4)^(•−),thereby degrading TTZ into products with lower biological toxicity.When the added PDS was only 0.1 mM,the degradation rate constant of TTZ could reach 0.1481 min−1.Furthermore,boron doping enhanced the stability of biochar,enabling the complete removal of 10 mg L^(−1)TTZ even after recycling and regeneration.In summary,this study offers a practical solution for the resource utilization of solid waste sorghum straw and the treatment of TTZ-polluted wastewater.

关 键 词：Sorghum straw Boron doping DFT Degradation Wastewater treatment PEROXYDISULFATE 

分 类 号：O64[理学—物理化学]