Hu Anqi, Jiang Yongcan, An Jiaqi, Huang Xiaodian, Elgarhy Abdelbaky Hossam, Cao Huafen, Liu Guanglong
PowerChina Huadong Engineering Corporation Ltd. Hangzhou 311122 Zhejiang Province China.
State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University Wuhan 430070 China
RSC Adv. 2024 Aug 27;14(37):27204-27214. doi: 10.1039/d4ra04795h. eCollection 2024 Aug 22.
Efficient elimination and recovery of phosphorus from agricultural return flows are crucial for effective eutrophication management and phosphorus reuse. In this study, a neutral Fe/Ca oxide co-embedded biochar (FCBC) was synthesized using calcium peroxide and ferrous chloride as precursors for phosphate recovery from agricultural return flows. FCBC possesses a highly intricate pore structure and an abundance of surface-active groups. Fe/Ca oxides were loaded onto the biochar in the form of CaFeO, FeO, and CaCO. FCBC demonstrated a broad pH tolerance range (pH = 6-12) in the aquatic environment. The maximum saturation adsorption capacity was 53.31 mg g. Phosphorus removal is influenced by Ca(PO) generation, intra-particle diffusion, and electrostatic attraction. The produced FCBC showed exceptional phosphorus removal efficiency in the presence of various anions, except for wastewater with high concentrations of SO , CO , HCO , and F (>500 mg L). FCBC can effectively remove phosphorus from agricultural return flows and reduce the risk of the water environment. Returning it to the field can also mitigate the depletion of phosphorus resources, effectively reduce carbon emissions from farmland, improve soil fertility, and realize multiple benefits.
从农业回流水中高效去除和回收磷对于有效管理富营养化和磷的再利用至关重要。在本研究中，以过氧化钙和氯化亚铁为前驱体合成了一种中性铁/钙氧化物共嵌入生物炭（FCBC），用于从农业回流水中回收磷。FCBC具有高度复杂的孔隙结构和丰富的表面活性基团。铁/钙氧化物以CaFeO、FeO和CaCO的形式负载在生物炭上。FCBC在水生环境中表现出较宽的pH耐受范围（pH = 6 - 12）。最大饱和吸附容量为53.31 mg g。磷的去除受Ca(PO)生成、颗粒内扩散和静电吸引的影响。所制备的FCBC在存在各种阴离子的情况下表现出优异的除磷效率，但高浓度SO、CO、HCO和F（>500 mg L）的废水除外。FCBC能有效去除农业回流水中的磷，降低水环境风险。将其返还田间还可缓解磷资源的枯竭，有效减少农田碳排放，提高土壤肥力，实现多重效益。
