Preparation and characterization of zirconia-loaded lignocellulosic butanol residue as a biosorbent for phosphate removal from aqueous solution

• Published in: Applied surface science Vol. 387; pp. 419 - 430
• Main Authors: Zong, Enmin, Liu, Xiaohuan, Jiang, Jinhua, Fu, Shenyuan, Chu, Fuxiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.11.2016
• Subjects: Adsorption; Adsorption isotherms; Aqueous solutions; Biosorbent; Butanol; Lignocellulose; Lignocellulosic butanol residue; Mechanism; Phosphate removal; Phosphates; Residues; Scanning electron microscopy; Surface chemistry; Zirconium; Lignocellulosic butanol residue; Phosphate removal; Biosorbent; Zirconium; Adsorption isotherms; Mechanism
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2016.06.107

[Display omitted] •LBR-Zr was evaluated as a novel biosorbent for phosphate removal.•Effects of process factors on phosphate adsorption were studied in detail.•LBR-Zr showed markedly enhanced phosphate adsorption compared to LBR.•The underlying mechanism for phosphate adsorption of LBR-Zr was fully investigated. Zirconium(IV) loaded lignocellulosic butanol residue (LBR-Zr) used for the adsorption of phosphate (P) ions from aqueous solution was synthesized and evaluated. The adsorption isotherms were fitted well with the Freundlich and Temkin modes. Thermodynamic analyses indicated that phosphate adsorption on the LBR-Zr increased with increasing temperature from 298 to 338K. The kinetic datas were described better by the pseudo-second-order adsorption kinetic rate model. Increasing pH suppressed phosphate adsorption. Coexisting anions study exhibited that the incorporation of CO32− anion had the largest influence on the phosphate adsorption capacity. The mechanism of adsorption process on LBR-Zr was analyzed by FTIR (Fourier transform infrared spectroscopy), scanning electron microscope (SEM) with an EDX (energy dispersive X-ray) and X-ray photoelectron spectroscopy (XPS) technologies, respectively. The above results confirmed that surface hydroxyl groups on biosorbent LBR-Zr were replaced by phosphate. The LBR-Zr with good specific affinity towards phosphate was a promising biosorbent for phosphate removal from aqueous solution. The research would be beneficial for developing a promising, eco-friendly phosphate biosorbent from plentiful lignocellulosic butanol residue.