Enhancing dissolved inorganic phosphorous capture by gypsum-incorporated biochar: Synergic performance and mechanisms.
Enhancing dissolved inorganic phosphorous capture by gypsum-incorporated biochar: Synergic performance and mechanisms.
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通过掺入石膏的生物炭增强溶解的无机磷捕获：协同性能和机制。
DOI：
10.1002/jeq2.20505
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发表时间：
2023
影响因子：
2.4
通讯作者：
Wei Zheng
中科院分区：
文献类型：
--
作者：
Sarmila Katuwal;Sophie Circenis;Linduo Zhao;Wei Zheng
流域中磷等营养物过多会危害水质，并引发有害藻类大量繁殖。利用磷吸附材料（PSM）从废水和农业径流中捕集磷，可以帮助回收养分，防止其对水体的污染。在这项研究中，一种新的设计师生物炭产生的热解木质生物质预处理与烟气脱硫石膏。通过石膏结合的设计师生物炭的溶解无机磷（DIP）的去除比石膏更有效，这表明用石膏预处理生物质导致在增强DIP捕获的协同效应。设计者的生物炭的最大P吸附容量为200毫克g-1以上，这是一个数量级大于石膏。该结果清楚地表明，与石膏相比，设计的生物炭是从营养物污染的水中捕获DIP的更好的PSM。吸附后的表征表明，吸附DIP的石膏掺入生物炭涉及多个机制。Ca阳离子和P阴离子在生物炭高碱性表面上形成CaHPO 4和Ca 3（PO 4）2沉淀的沉淀反应被确定为主要机制。CaHPO 4·2 H2O是石膏吸附DIP的唯一沉淀产物。此外，初始溶液pH和共存的碳酸氢盐对生物炭去除DIP的影响小于石膏，这进一步证实了前者是从各种水介质中捕获DIP的优良PSM。本文受版权保护。All rights reserved.
Excess nutrients such as phosphorus (P) in watersheds jeopardize water quality and trigger harmful algal blooms. Using phosphorus sorption material (PSM) to capture P from wastewater and agricultural runoff can help recover nutrients and prevent their water pollution. In this study, a novel designer biochar was generated by pyrolyzing woody biomass pretreated with a flue gas desulfurization gypsum. The removal of dissolved inorganic phosphorus (DIP) by the gypsum-incorporated designer biochar was more efficient than the gypsum, suggesting the pretreatment of biomass with the gypsum results in a synergic effect on enhancing DIP capture. The maximum P adsorption capacity of the designer biochar was more than 200 mg g-1 , which is one order of magnitude greater than that of the gypsum. This result clearly showed that the designer biochar is a better PSM to capture DIP from nutrient-contaminated water compared to the gypsum. Post-sorption characterization indicated that the sorption of DIP by the gypsum-incorporated biochar involves multiple mechanisms. The precipitation reactions of Ca cations and P anions to form CaHPO4 and Ca3 (PO4 )2 precipitates on the highly alkaline surface of the designer biochar were identified as a main mechanism. By contrast, CaHPO4 ·2H2 O is the only precipitated product for DIP sorption by the gypsum. In addition, the initial solution pH and the coexisting bicarbonate had less effects on the DIP removal by the designer biochar in comparison with the gypsum, which further confirms the former is an excellent PSM to capture DIP from a variety of aquatic media. This article is protected by copyright. All rights reserved.