Fabrication of a Biomass-Based Hydrous Zirconium Oxide Nanocomposite for Preferable Phosphate Removal and Recovery

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• 作者：Hui Qiu ; Chen Liang ; Xiaolin Zhang ; Mindong Chen ; Yunxia Zhao ; Tao Tao ; Zhengwen Xu ; Gang Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：7
• 期：37
• 页码：20835-20844
• 全文大小：667K
• ISSN：1944-8252

文摘

Advanced removal of phosphate by low-cost adsorbents from municipal wastewater or industrial effluents is an effective and economic way to prevent the occurrence of eutrophication. Here, we proposed a novel method to immobilize hydrous zirconium oxide nanoparticle within quaternary-aminated wheat straw, and obtained an inexpensive, eco-friendly nanocomposite Ws鈥揘鈥揨r. The biomass-based Ws鈥揘鈥揨r exhibited higher preference toward phosphate than commercial anion exchanger IRA-900 when competing sulfate ions coexisted at relatively high levels. Such excellent performance of Ws鈥揘鈥揨r resulted from its specific hybrid structure, the quaternary ammonium groups bonded on the host favor the preconcentration of phosphate ions inside the wheat straw based on Donnan effect, and the encapsulated HZO nanoparticle exhibits preferable sequestration of phosphate ions through specific interaction, as further demonstrated by FTIR and X-ray photoelectron spectroscopy. Cycle adsorption and regeneration experiments demonstrated that Ws鈥揘鈥揨r could be employed for repeated use without significant capacity loss, when the binary NaOH鈥揘aCl solution was employed as the regenerant. The influence of solution pH and contact time was also examined. The results suggested that Ws鈥揘鈥揨r has a great potential in efficient removal of phosphate in contaminated waters.