Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Main Campus, P.O. Box 1982, Dammam, 34212, Saudi Arabia.
Department of Chemical Engineering, An-Najah National University, Nablus, Palestine.
Environ Sci Pollut Res Int. 2023 Oct;30(50):109162-109180. doi: 10.1007/s11356-023-29954-z. Epub 2023 Sep 28.
Antibiotic-contaminated water is a crucial issue worldwide. Thus, in this study, the MgFeCa-layered double hydroxides were supported in date palm-derived biochar (B) using co-precipitation, hydrothermal, and co-pyrolysis methods. It closes gaps in composite design for pharmaceutical pollutant removal, advances eco-friendly adsorbents, and advances targeted water cleanup by investigating synthesis methodologies and gaining new insights into adsorption. The prepared B-MgFeCa composites were investigated for tetracycline (TC) adsorption from an aqueous solution. The B-MgFeCa composites synthesized through co-precipitation and hydrothermal methods exhibited better crystallinity, functional groups, and well-developed LDH structure within the biochar matrix. However, the co-pyrolysis method resulted in the LDH structure breakage, leading to the low crystalline composite material. The maximum adsorption of TC onto all B-MgFeCa was obtained at an acidic pH range (4-5). The B-MgFeCa composites produced via hydrothermal and co-pyrolysis methods showed higher and faster TC adsorption than the co-precipitation method. The kinetic results can be better described by Langmuir kinetic and mixed order models at low and high TC concentrations, indicating that the rate-limiting step is mainly associated with active binding sites adsorption. The Sip and Freundlich models showed better fitting with the equilibrium data. The TC removal by B-MgFeCa composites prepared via hydrothermal, the highest estimated uptake which is around 639.76 mg.g according to the Sips model at ambient conditions, and co-pyrolysis was mainly dominated by physical and chemical interactions. The composite obtained via the co-precipitation method adsorbed TC through chemical bonding between surface functional groups with anionic species of TC molecule. The B-MgFeCa composite showed excellent reusability performance for up to five cycles with only a 30% decrease in TC removal efficiency. The results demonstrated that B-MgFeCa composites could be used as promising adsorbent materials for effective wastewater treatment.
受抗生素污染的水是一个全球性的关键问题。因此，在这项研究中，采用共沉淀、水热和共热解的方法，将镁铁钙层状双氢氧化物负载在由椰枣衍生的生物炭（B）上。它通过研究合成方法，为药物污染物去除的复合设计填补空白，推进环保型吸附剂的发展，并为有针对性的水净化提供新的见解，从而为药物污染物去除的复合设计提供新的见解。从水溶液中吸附四环素（TC）来研究制备的 B-MgFeCa 复合材料。通过共沉淀和水热法合成的 B-MgFeCa 复合材料表现出更好的结晶度、官能团和在生物炭基质内发达的 LDH 结构。然而，共热解法导致 LDH 结构断裂，导致复合材料结晶度低。所有 B-MgFeCa 对 TC 的最大吸附均在酸性 pH 范围（4-5）内获得。水热法和共热解法制备的 B-MgFeCa 复合材料对 TC 的吸附速度更快、吸附量更高，而共沉淀法则较低。在低和高 TC 浓度下，动力学结果可以更好地用朗缪尔动力学和混合顺序模型描述，表明速率限制步骤主要与活性结合位点的吸附有关。Sip 和 Freundlich 模型与平衡数据拟合较好。在环境条件下，根据 Sips 模型，水热法和共热解法制备的 B-MgFeCa 复合材料对 TC 的去除率最高，约为 639.76mg·g-1，估计的摄取量最高，而共沉淀法主要受物理和化学相互作用的控制。通过共沉淀法制备的复合材料通过表面官能团与 TC 分子的阴离子物种之间的化学键合吸附 TC。B-MgFeCa 复合材料在多达五个循环中表现出出色的可重复使用性能，TC 去除效率仅降低 30%。结果表明，B-MgFeCa 复合材料可用作高效废水处理的有前途的吸附材料。
