利用 LDHs 修饰生物炭从废水中高效回收和利用磷。
Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar.
机构信息
School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China.
College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421001, China.
出版信息
Int J Environ Res Public Health. 2023 Feb 9;20(4):3051. doi: 10.3390/ijerph20043051.
The excessive application of phosphate fertilizers easily causes water eutrophication. Phosphorus recovery by adsorption is regarded as an effective and simple intervention to control water bodies' eutrophication. In this work, a series of new adsorbents, layered double hydroxides (LDHs)-modified biochar (BC) with different molar ratios of Mg and Fe, were synthesized based on waste jute stalk and used for recycling phosphate from wastewater. The prepared LDHs-BC4 (the molar ratio of Mg/Fe is 4:1) has significantly high adsorption performance, and the recovery rate of phosphate is about 10 times higher than that of the pristine jute stalk BC. The maximum adsorption capacity of LDHs-BC4 for phosphate was 10.64 mg-P/g. The main mechanism of phosphate adsorption mainly includes electrostatic attraction, ion exchange, ligand exchange, and intragranular diffusion. Moreover, the phosphate-adsorbed LDHs-BC4 could promote mung bean growth, which indicated the recovery phosphate from wastewater could be used as a fertilizer.
过量施用磷肥容易导致水体富营养化。吸附法回收磷被认为是控制水体富营养化的一种有效而简单的干预措施。在这项工作中，基于废黄麻秸秆，合成了一系列具有不同镁铁摩尔比的层状双氢氧化物（LDHs）改性生物炭（BC）新型吸附剂，用于从废水中回收磷。所制备的 LDHs-BC4（Mg/Fe 摩尔比为 4:1）具有显著的高吸附性能，磷的回收率约比原始黄麻秸秆 BC 高 10 倍。LDHs-BC4 对磷的最大吸附容量为 10.64mg-P/g。磷吸附的主要机制主要包括静电吸引、离子交换、配体交换和颗粒内扩散。此外，吸附磷的 LDHs-BC4 可以促进绿豆的生长，这表明从废水中回收的磷可以用作肥料。
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