title: Insights into the equilibrium, kinetic and thermodynamics of nickel removal by environmental friendly Lansium domesticum peel biosorbent.
abstract: Lansium domesticum peel (LDP), a waste material generated from the fruit consumption, was evaluated as a biosorbent for nickel removal from aqueous media. The effects of dosage, contact time, initial pH, initial concentration and temperature on the biosorption process were investigated in batch experiments. Equilibrium data were fitted by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models using nonlinear regression method with the best-fit model evaluated based on coefficient of determination (R(2)) and Chi-square (χ(2)). The best-fit isotherm was found to be the Langmuir model exhibiting R(2) very close to unity (0.997-0.999), smallest χ(2) (0.0138-0.0562) and largest biosorption capacity (10.1mg/g) at 30°C. Kinetic studies showed that the initial nickel removal was rapid with the equilibrium state established within 30min. Pseudo-second-order model was the best-fit kinetic model indicating the chemisorption nature of the biosorption process. Further data analysis by the intraparticle diffusion model revealed the involvement of several rate-controlling steps such as boundary layer and intraparticle diffusion. Thermodynamically, the process was exothermic, spontaneous and feasible. Regeneration studies indicated that LDP biosorbent could be regenerated using hydrochloric acid solution with up to 85% efficiency. The present investigation proved that LDP having no economic value can be used as an alternative eco-friendly biosorbent for remediation of nickel contaminated water.
authors.affiliation: Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Malaysia.
authors.forename: Yun Fung
authors.initials: YF
authors.lastname: Lam
authors.affiliation: Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Malaysia. Electronic address: lai-yee.lee@nottingham.edu.my.
authors.forename: Lai Yee
authors.initials: LY
authors.lastname: Lee
authors.affiliation: Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Malaysia.
authors.forename: Song Jun
authors.initials: SJ
authors.lastname: Chua
authors.affiliation: Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Malaysia.
authors.forename: Siew Shee
authors.initials: SS
authors.lastname: Lim
authors.affiliation: Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Malaysia.
authors.forename: Suyin
authors.initials: S
authors.lastname: Gan
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D006863:Hydrogen-Ion Concentration; D007221:Industry; D007700:Kinetics; D029582:Meliaceae / Q000378:metabolism*; D008956:Models, Chemical; D009532:Nickel / Q000378:metabolism / Q000493:pharmacokinetics*; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000493:pharmacokinetics*
chemical_list: D014874:Water Pollutants, Chemical; D009532:Nickel
keywords: Biosorption; Equilibrium; Kinetics; Lansium domesticum; Nickel; Thermodynamics