Functionalizing biochar with Mg-Al and Mg-Fe layered double hydroxides for removal of phosphate from aqueous solutions

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• 作者：Stefan Wan^a ; Shengsen Wang^b ; Yuncong Li^c ; Bin Gao^b ; ^bg55@ufl.edu
• 关键词：Biochar modification ; Layered double hydroxides ; Phosphate adsorption ; Nanocomposites
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2017
• 出版时间：25 March 2017
• 年：2017
• 卷：47
• 期：Complete
• 页码：246-253
• 全文大小：1749 K
• 卷排序：47

文摘

This study examined phosphate adsorption of bamboo biochar functionalized with varying amount of Mg–Al and Mg–Fe (3:1) layered double hydroxides (LDH). Results indicated that the composite containing 40% Mg–Al LDH exhibited the highest phosphate adsorption with  >95% phosphate saturation achieved within 1 h, following the pseudo-second-order kinetics model. Characterization and adsorption isotherm of this composite revealed interlayer anion exchange and surface adsorption as the predominant adsorption mechanism at low phosphate concentrations and phosphate precipitation at high concentrations. A lettuce seedling bioassay further demonstrated that the spent LDH/biochar composite can be recycled as a slow-release fertilizer to enhance food production.