Uptake of phosphate and Cr(VI) by amine-functionalized Chinese reed: Considering the computations and characteristics analysis

作者：Ren, Zhongfei; Xu, Xing^*; Qi, Shutao; Li, Yanwei; Gao, Baoyu; Song, Wen; Jiang, Peng

来源：Journal of the Taiwan Institute of Chemical Engineers, 2017, 72: 85-94.

DOI：10.1016/j.jtice.2017.01.007

• Chinese reed
• Phosphate
• Cr(VI)
• DFT calculations
• XPS

The Chinese reed that was introduced with quaternization structure [(N+)(CH2CH3)(3)Cl-] was used for removing Cr(VI) and phosphate from liquids. The adsorption isotherms and column adsorption were executed to measure the adsorption property. Raman spectra and XPS analysis were also applied to evaluate the clean and Cr(VI)/phosphate samples. Theoretical computation of adsorption energies between phosphate/Cr(VI) and CH2CH3)(3)N+ indicated that the binding between the [CrO4](2-) and (CH2CH3)(3)N+ was more stable and more [CrO4](2-) could be adsorbed by the (CH2CH3)(3)N+. This result corresponded well to the adsorption data that the Q(max) (4.93-5.75 mmol/g) of Cr(VI) by modified reed was about 3 times higher than that (1.71-1.95 mmol/g) of phosphate. The results of column adsorption showed that the Thomas model fitted well with phosphate adsorption process. Raman spectra analysis shows that phosphate adsorbed on the AFCR was based on the electrostatic pull, and the reduction of Cr(VI) changed the surface functional groups. The Atomic percentage of 0 detected in XPS increased sharply (20.67-29.12%) by the Cr(VI) adsorption; this indicated the adsorption process of Cr(VI) contained redox reaction that oxidized some surface functional groups.

• 出版日期2017-3
• 单位山东大学