title: A novel solid digestate-derived biochar-Cu NP composite activating H2O2system for simultaneous adsorption and degradation of tetracycline.
abstract: Solid digestate, a by-product of anaerobic digestion systems, has led to a range of environmental issues. In the present study, a novel composite based on a solid digestate-biochar-Cu NP composite was synthesized for tetracycline removal from an aqueous medium. The removal efficiency values for tetracycline (200 mg L-1) were 31.5% and 97.8%, respectively, by the biochar-Cu NP composite (0.5 g L-1) in the absence and presence of hydrogen peroxide (H2O2, 20 mM) within 6 h of reaction time. The possible degradation pathway of tetracycline was investigated using liquid chromatography-mass spectrometry. The desorption experiment results suggested that no significant concentration of tetracycline was detected on the composite after the reaction, but a small amount of intermediates in terms of total organic carbon (TOC) accounting for 3.1%, and 23.3% of the end-product NH4+was adsorbed onto the biochar sheets. The dispersive Cu NPs on the biochar resulted in an increase in the surface area and pore volume of the biochar-Cu NP composite, which enhanced tetracycline adsorption as well as the degradation efficiency. Relative tetracycline removal mechanisms were dominantly ascribed to ·OH generation from the Cu(II)/Cu(I) redox reaction with H2O2and the electron-transfer process of free radicals (FRs) in biochar. The proposed approach serves dual purposes of waste digestate reuse and treatment of antibiotic pollutants. This study highlights the activation of H2O2by the dispersive Cu NPs coupling with biochar derived from a waste solid digestate for tetracycline treatment.
authors.affiliation: Department of Environmental Science and Engineering, College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China; Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005, PR China.
authors.forename: Dun
authors.initials: D
authors.lastname: Fu
authors.affiliation: Department of Environmental Science and Engineering, College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China; Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005, PR China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Xia
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Shen
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005, PR China.
authors.forename: Yuanpeng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Environmental Science and Engineering, College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China; Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen 361005, PR China; College of Chemistry and Life Science, Quanzhou Normal University, Quanzhou 362000, PR China. Electronic address: kelqb@xmu.edu.cn.
authors.forename: Qingbiao
authors.initials: Q
authors.lastname: Li
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D005609:Free Radicals; D006861:Hydrogen Peroxide / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D013752:Tetracycline / Q000737:chemistry*
chemical_list: D005609:Free Radicals; C540010:biochar; D002606:Charcoal; D003300:Copper; D006861:Hydrogen Peroxide; D013752:Tetracycline
keywords: Adsorption-degradation process; Biochar-Cu NP composite; Free radicals; Hydroxyl radical; Tetracycline