title: Performance, kinetics, and equilibrium of methylene blue adsorption on biochar derived from eucalyptus saw dust modified with citric, tartaric, and acetic acids.
abstract: Biochar derived from eucalyptus saw dust modified with citric, tartaric, and acetic acids at low temperatures was utilized as adsorbent to remove methylene blue (MB) from aqueous solutions. Fourier transform infrared spectroscopy analysis showed that the carboxyl group was introduced on the biochar surface. Adsorption experiment data indicated that eucalyptus saw dust modified with citric acid showed higher MB adsorption efficiency than that modified with tartaric and acetic acids. Pseudo-second-order kinetics was the most suitable model for describing MB adsorption on biochar compared with pseudo-first-order, Elovich, and intraparticle diffusion models. The calculated values of ΔG(0) and ΔH(0) indicated the spontaneous and endothermic nature of the adsorption process. MB adsorption on biochar followed the Langmuir isotherm. The maximum adsorption capacities for eucalyptus saw dust modified with citric, tartaric, and acetic acids were 178.57, 99.01, and 29.94 mg g(-1), respectively, at 35°C.
authors.affiliation: School of Environment, Guangxi University, Nanning 530004, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.affiliation: School of Environment, Guangxi University, Nanning 530004, PR China.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Chen
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China. Electronic address: shungang0620@163.com.
authors.forename: Shungang
authors.initials: S
authors.lastname: Wan
authors.affiliation: School of Environment, Guangxi University, Nanning 530004, PR China.
authors.forename: Zebin
authors.initials: Z
authors.lastname: Yu
mesh_terms: D000085:Acetates; D000327:Adsorption; D002606:Charcoal; D019343:Citric Acid; D004058:Diffusion; D004391:Dust; D005052:Eucalyptus; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013644:Tartrates
chemical_list: D000085:Acetates; D004391:Dust; D013644:Tartrates; C540010:biochar; D002606:Charcoal; D019343:Citric Acid; D008751:Methylene Blue; C029768:tartaric acid
keywords: Adsorption; Biochar; Eucalyptus saw dust; Modification; Organic acid