title: Application of annealed red mud to Mn(2+) ion adsorption from aqueous solution.
abstract: Physicochemical characteristics and Mn(2+) adsorption of annealed red mud were investigated in this study. The annealing temperature (105-900 °C) changed the mineralogical components and the point of zero charge of red mud. By comparison, annealed red mud at 700 °C (ARM700) had a better adsorption effect than other annealed samples, associated with the activated components of available Fe2O3, Al2O3, SiO2 and Na5Al3(SiO4)3CO3 (natrodavyne). The removal efficiency of Mn(2+) by ARM700 was dependent on initial pH, contact time, and initial Mn(2+) concentration of aqueous solution and was ∼56.5% with initial Mn(2+) concentration 385 mg/L at initial pH > 5. The kinetics process was predicted better by the pseudo-second-order model. The Langmuir isotherm displayed a better fitting model than the Freundlich isotherm and the Mn(2+) maximum adsorption capacity of ARM700 was 88.3 mg/g. The competing effects of Cu(2+) and Zn(2+) on Mn(2+) removal were most obvious. There was efficient Mn(2+) removal at the application of ARM700 to the leachate of electrolytic manganese residue.
authors.affiliation: College of Chemistry and Chemical Engineering, Anshun University, No. 25 Xueyuan Road, Anshun Xixiu Zone, Guizhou Province 561000, China E-mail: 278631830@qq.com.
authors.forename: Hongliang
authors.initials: H
authors.lastname: Chen
authors.affiliation: College of Chemistry and Chemical Engineering, Anshun University, No. 25 Xueyuan Road, Anshun Xixiu Zone, Guizhou Province 561000, China E-mail: 278631830@qq.com.
authors.forename: Juan
authors.initials: J
authors.lastname: Zheng
authors.affiliation: College of Chemistry and Chemical Engineering, Anshun University, No. 25 Xueyuan Road, Anshun Xixiu Zone, Guizhou Province 561000, China E-mail: 278631830@qq.com.
authors.forename: Zhongqiong
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Anshun University, No. 25 Xueyuan Road, Anshun Xixiu Zone, Guizhou Province 561000, China E-mail: 278631830@qq.com.
authors.forename: Qian
authors.initials: Q
authors.lastname: Long
authors.affiliation: College of Chemistry and Chemical Engineering, Anshun University, No. 25 Xueyuan Road, Anshun Xixiu Zone, Guizhou Province 561000, China E-mail: 278631830@qq.com.
authors.forename: Qiuyun
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D008345:Manganese / Q000302:isolation & purification*; D059027:Recycling; D012822:Silicon Dioxide; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D005290:Ferric Compounds; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D008345:Manganese; D012822:Silicon Dioxide