title: Lotus seedpod as a low-cost biomass for potential methylene blue adsorption.
abstract: The adsorption of methylene blue (MB) by low cost biomass lotus seedpod (LSP) was optimized by a central composite design combined with response surface methodology in aqueous solution. Solution pH, initial dye concentration and adsorbent dosage were studied as independent variables at five levels each, respectively. Analysis of variance suggested the validity of the regression model. LSP was characterized by Fourier transform infrared spectra and energy dispersive spectroscopy. The kinetics revealed that the adsorption behavior followed the pseudo-second-order model. Langmuir and Freundlich isotherm models were used to evaluate the adsorption, and the experimental data were better fitted by the Langmuir isotherm than the Freundlich isotherm. The maximum monolayer adsorption capacity of the LSP was 157.98 mg g-1at 30 °C for MB adsorption. In addition, 0.2 M HCl solution could be used for reusability of LSP via desorption tests. LSP was proven to be an available and effective biosorbent for MB removal from aqueous solution.
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywang96@126.com.
authors.forename: Qiulai
authors.initials: Q
authors.lastname: He
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywang96@126.com.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywang96@126.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywang96@126.com.
authors.forename: Zhuocheng
authors.initials: Z
authors.lastname: Zou
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywang96@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: hywang96@126.com.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.affiliation: Central and Southern China Municipal Engineering Design & Research Institute Co. Ltd, Wuhan 430072, China.
authors.forename: Lian
authors.initials: L
authors.lastname: Zheng
mesh_terms: D000327:Adsorption; D018533:Biomass; D003365:Costs and Cost Analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D000070116:Lotus; D008751:Methylene Blue / Q000737:chemistry*; D059027:Recycling / Q000191:economics / Q000379:methods; D012639:Seeds; D012996:Solutions; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D014865:Waste Disposal, Fluid / Q000191:economics / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; D008751:Methylene Blue