10.26091/ESRNZ.9730277.v1 Lie Yang Lie Yang Liuyang He Liuyang He Jianming Xue Jianming Xue Yongfei Ma Yongfei Ma Hong Li Hong Li Pai Peng Pai Peng Ming Li Ming Li Zulin Zhang Zulin Zhang Highly efficient nickel (II) removal by sewage sludge biochar supported α-Fe2O3 and α-FeOOH: Sorption Characteristics and Mechanisms Institute of Environmental Science and Research 2019 Nickel (II) ion Ni (II) Ni Contamination Adsorption Kinetic Study Sewage Sludge Biochar Adsorption mechanism Soil contamination Modified sludge biochar Environmental Chemistry Inorganic Chemistry Environmental Management Environmental Monitoring Environmental Science 2019-08-27 21:21:17 Journal contribution https://research.esr.cri.nz/articles/journal_contribution/Highly_efficient_nickel_II_removal_by_sewage_sludge_biochar_supported_-Fe2O3_and_-FeOOH_Sorption_Characteristics_and_Mechanisms/9730277 A novel approach was employed to load α-Fe2O3 and α-FeOOH onto sewage sludge biochar (SBC) with the purpose of efficient nickel (Ni) removal. A high Ni(II) adsorption capacity of 35.50 mg·g-1 in 100 ppm Ni(II) solution with 10 mg modified sewage sludge biochar (MSBC) was achieved. The adsorption kinetic and isotherm were fitted well by the pseudo-second-order model and the Langmuir model, respectively. The optimal pH was found around a neutral pH of 7. The adsorption mechanisms of Ni(II) onto MSBC were described as the synergistic effects of electrostatic attraction, ion exchange, inner-sphere complexation and co-precipitation. The initial rapid adsorption phenomenon could be attributed to electrostatic attraction and ion exchange, and then inner-sphere complexation and co-precipitation acted as a crucial role in the following step. The remarkable performance of MSBC provides an effective waste utilization approach to simultaneous sewage sludge recycle and Ni removal from aqueous solution.