title: Synthesis and characterization of a novel magnetic biochar from sewage sludge and its effectiveness in the removal of methyl orange from aqueous solution.
abstract: A novel magnetic biochar from sewage sludge (MSBC) using SrFe12O19as magnetic substrate was successfully synthesized under high-temperature and oxygen-free conditions. Several techniques and methodologies (X-ray diffraction, Fourier transform infrared spectroscopy and vibrating sample magnetometer) were used to determine the surface functional groups and physicochemical properties of MSBC, which showed that the MSBC combined the features of both SrFe12O19and sludge biochar (SBC). And then the adsorption behavior of methyl orange (MO) from aqueous solution onto the MSBC was investigated. And the influence of variables including pH, initial concentration of MO, adsorbent dosage and contact time was studied in detail. The optimal adsorption amount of MO (149.18 mg·g-1) was obtained with 600 MO mg·L-1, 2 MSBC g·L-1, at pH of 5 for 40 min. The equilibrium data were evaluated using Langmuir and Freundlich isotherms. The Langmuir model better described the absorption of MO. Besides, the kinetic data were analyzed using pseudo-first-order and pseudo-second-order equations, and the pseudo-second order exhibited the better fit for the kinetic studies (R2= 0.9982). This study showed that MSBC could be utilized as an efficient, magnetically separable adsorbent for the environmental cleanup.
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hongyuwang220@126.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hongyuwang220@126.com.
authors.forename: Mao
authors.initials: M
authors.lastname: Liu
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hongyuwang220@126.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hongyuwang220@126.com.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hongyuwang220@126.com.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D002606:Charcoal / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012722:Sewage / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D001391:Azo Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; C100258:methyl orange