title: Removal of Cu²⁺ from aqueous solutions by the novel modified bagasse pulp cellulose: Kinetics, isotherm and mechanism.
abstract: This study designed and synthesized a novel cellulose-based heavy metal adsorption material. One kind of bagasse pulp cellulose was pretreated under microwave 200 W for 3 min before the epoxidation, amination and ultrasonic enhancement sulfonation reaction. Heavy metal adsorption groups N and S were grafted onto the bagasse pulp cellulose. Furthermore, the effects of solution pH, adsorption temperature, adsorbent dosage, Cu(2+) concentration, and adsorbent recycling on adsorption capacity were investigated. Under the optimum condition, the adsorption amount of Cu(2+) was 35.2mg/g adsorbent. Compared with other cellulose-based adsorbents, this kind of adsorbent could be easily prepared and effectively recycled. Except for the normal fitting of adsorption process with the Langmuir isotherm adsorption model, Freundlich isotherm adsorption model and secondary adsorption kinetics model, the solid-liquid phase adsorption mechanism was also introduced to explain the Cu(2+) adsorption process. Three consecutive stages were deeply discussed and verified, where the surface diffusion and particle internal diffusion process were the primary along with a quick adsorption of the adsorbate onto the in-hole surface of the cellulose-based adsorbent.
authors.affiliation: College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China.
authors.forename: Hong-Xiang
authors.initials: HX
authors.lastname: Zhu
authors.affiliation: College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China.
authors.forename: Xue-Juan
authors.initials: XJ
authors.lastname: Cao
authors.affiliation: College of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou 213164, PR China. Electronic address: yucaihe@cczu.edu.cn.
authors.forename: Yu-Cai
authors.initials: YC
authors.lastname: He
authors.affiliation: College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China.
authors.forename: Qiao-Ping
authors.initials: QP
authors.lastname: Kong
authors.affiliation: PCFM Lab, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: He
authors.affiliation: College of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, PR China.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D002482:Cellulose / Q000737:chemistry* / Q000648:ultrastructure; D003300:Copper / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D019216:Metals, Heavy / Q000302:isolation & purification; D012996:Solutions; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014961:X-Ray Diffraction
chemical_list: D019216:Metals, Heavy; D012996:Solutions; D014874:Water Pollutants, Chemical; D003300:Copper; D002482:Cellulose; C027433:bagasse
keywords: Adsorption kinetics; Cellulose-based; Heavy metal; Isotherm; Mechanism