A novel biochar-based 3D composite for ultrafast and selective Cr(VI)removal in electroplating wastewater  

作　　者：Zongzheng Yang Jinjin Wang Nan Zhao Runyi Pang Chuanfang Zhao Ying Deng Di Yang Haochen Jiang Zhiguo Wu Rongliang Qiu 

机构地区：[1]College of Oceanography and Environment,Tianjin University of Science and Technology,Tianjin 300457,China. [2]College of Chemical Engineering and Materials,Tianjin University of Science and Technology,Tianjin 300457,China. [3]National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China,Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management,Institute of Eco-Environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou 510650,China. [4]Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,School of Environmental Science and Engineering,Sun Yat-Sen University,Guangzhou 510275,China. [5]Guangdong Laboratory for Lingnan Modern Agriculture,College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China. [6]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China.

出　　处：《Biochar》2024年第1期818-834,共17页生物炭(英文)

摘　　要：In this study,a newly developed composite of biochar-poly(m-phenylenediamine)(BC-PmPD)exhibiting a distinct skeletal structure was synthesized for the purpose of extracting Cr(VI)from aqueous solutions.BC was employed as a supportive carrier onto which PmPD nanoparticles were uniformly affixed through in-situ polymerization and oxidation synthesis,both within and outside the layered configuration of BC.The structural stability and morphologies of BC-PmPD were assessed utilizing Fourier transform infrared(FTIR)spectroscopy,scanning electron microscopy,thermogravimetric analysis,analysis of specific surface area and pore size,X-ray photoelectron spectroscopy(XPS),and X-ray diffraction.In comparison to other modified BCs reported,BC-PmPD exhibited the highest Cr(VI)removal rate.Specifically,at 303 K,BC-PmPD achieved a maximum Cr(VI)removal capacity of 775 mg g−1,surpassing the capabilities of unmodified BC and PmPD by 10.4 and 2.13 times,respectively.Analyses involving XPS,FTIR,and density functional theory calculation confirmed that proton transfer happened between protonated amine(−NH2)functional group within the structure of BC-PmPD and HCrO4−before the formation of hydrogen bond.Subsequently,environmentally persistent free radicals facilitated the reduction of the adsorbed Cr(VI).Quantification of the functional groups indicated that the amino group was responsible for 93.0%of the Cr(VI)adsorption in BC-PmPD.BC-PmPD dis-played potent adsorption and reduction capabilities,alongside notable stability,repeatability,and promising potential for application in the remediation for high concentrations of Cr(VI)in electroplating wastewater scenarios.

关 键 词：BC-poly(m-phenylenediamine)composite Selective removal of Cr(VI) Electroplating wastewater Proton transfer H bond 

分 类 号：O64[理学—物理化学]