Rationally designed functional macroporous materials as new adsorbents for efficient phosphorus removal
Rationally designed functional macroporous materials as new adsorbents for efficient phosphorus removal
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DOI：
10.1039/c2jm16681j
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发表时间：
2012-04
影响因子：
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通讯作者：
Junliang Yang;Pei Yuan;Hsin-yi Chen;J. Zou;Zhiguo Yuan;Chengzhong Yu
中科院分区：
文献类型：
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作者：
Junliang Yang;Pei Yuan;Hsin-yi Chen;J. Zou;Zhiguo Yuan;Chengzhong Yu
已成功开发出具有高吸附容量（高达2.272 mmol g-1）和在1 mg L-1的低磷浓度范围内具有优异吸附性能的新型磷（P）吸附剂。该材料在初始浓度为1 mg L−1的情况下，在30分钟内实现高达96%的磷去除。以大孔有序硅泡沫（MOSF）为基质制备吸附剂。在用镧物种（La-MOSF）改性后，二氧化硅层（厚度为约5 nm）的两侧被两层氧化镧覆盖，每层氧化镧的厚度为约2.3nm，形成独特的类镧壁结构。由于La-MOSF非常大的孔径（约100 nm），在P吸附之后，所形成的LaPO 4物质被限制在孔内而不引起孔堵塞，从而允许高负载的氧化镧和高吸附容量。此外，氧化镧的薄层性质促进氧化镧和磷酸根离子之间的反应，导致在低P浓度范围内的吸附性能增强。这些设计合理、性能优异的大孔材料在水质控制和保护方面具有很大的潜力。
Novel phosphorus (P) adsorbents with a high adsorption capacity (up to 2.272 mmol g−1) and excellent adsorption performance in a low P concentration range of 1 mg L−1 have been successfully developed. The material achieves up to 96% P removal within 30 min with an initial concentration of 1 mg L−1. The adsorbents are prepared using macroporous ordered silica foams (MOSF) as the host. After modification by lanthanum species (La–MOSF), the two sides of the silica layer (∼5 nm in thickness) are coated by two layers of lanthanum oxide each with a thickness of ∼2.3 nm, forming a unique sandwich-like wall structure. Due to the very large pore size of La–MOSF (∼100 nm), after P adsorption the formed LaPO4 species are confined inside the pores without causing pore blocking, allowing for a high loading of lanthanum oxide and a high adsorption capacity. Moreover, the thin layer nature of lanthanum oxide facilitates the reaction between lanthanum oxide and phosphate ions, leading to the enhanced performance for the adsorption in low P concentration ranges. These rationally designed macroporous materials with outstanding performance have great potentials in water quality control and protection.