title: Adsorption of arsenic, phosphorus and chromium by bismuth impregnated biochar: Adsorption mechanism and depleted adsorbent utilization.
abstract: Bismuth impregnated biochar were synthesized to deal with wastewater pollution. Nitrogen adsorption-desorption isotherms, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to determine the characteristics of adsorbents and explore the main adsorption mechanism. Results showed that bismuth particle was carried successfully within the biochar matrix, making contributions to creating micropore and boost specific surface area. The loaded bismuth, served as the adsorption site, rather than the specific surface area played an important role in arsenic and phosphorus adsorption. Batch adsorption experiments demonstrated a fit Langmuir model for arsenic (As) and phosphorus (P) and a suitable Freundlich model for chromium (Cr). Thermodynamic parameters depicted the endothermic nature and the spontaneous process for phosphate and arsenic adsorption. Besides, this contaminant-loaded carbon adsorbent was further applied for the removal of methylene blue from aqueous solution.
authors: Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing 210008, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China.
authors: Ningyuan
authors: N
authors: Zhu
authors: Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing 210008, China. Electronic address: tmyan@issas.ac.cn.
authors: Tingmei
authors: T
authors: Yan
authors: Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing 210008, China.
authors: Jun
authors: J
authors: Qiao
authors: Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing 210008, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China.
authors: Honglei
authors: H
authors: Cao
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000032:analysis / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D010710:Phosphates / Q000032:analysis; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013816:Thermodynamics; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D001151:Arsenic; D001729:Bismuth; D002606:Charcoal; D002857:Chromium; D008751:Methylene Blue; D010710:Phosphates; D010758:Phosphorus; D062065:Wastewater; D014874:Water Pollutants, Chemical; C540010:biochar
keywords: Activated carbon; Adsorption mechanism; Bismuth; Depleted adsorbents