College of Natural Resources and Environment, Northwest A＆F University, Yangling, 712100, China.
College of Natural Resources and Environment, Northwest A＆F University, Yangling, 712100, China; Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China.
Chemosphere. 2022 Jul;299:134414. doi: 10.1016/j.chemosphere.2022.134414. Epub 2022 Mar 25.
Various bentonite-sludge biochar composites were fabricated by a sequence of loading and pyrolysis for the simultaneous removal of norfloxacin (NOR) and copper (Cu) from an aqueous solution. The morphology and characteristics of obtained composites were reflected through cation exchange capacity (CEC), BET specific surface area (S), SEM, XRD, FTIR and XPS. The isothermal adsorption results showed that Sips adsorption model fitted better for the adsorption of NOR and Cu during co-adsorption. The theoretical maximum adsorption capacity of BT:2 SB (the mass ratio of bentonite to sludge is 1:2) for NOR and Cu was 89.36 mg g and 104.10 mg g at 25 °C in the co-adsorption system. The thermodynamic results showed the capture of NOR and Cu was spontaneous, accompanied by an endothermic reaction with different randomness. In the co-adsorption system, the two were antagonistic to each other due to competition for the adsorption sites of hydroxyl, carboxylic acid and negatively charged provided by bentonite-sludge biochar. This study suggests that using natural mineral as a pyrolysis improver for sludge biochar can product the value-enhanced biochar for simultaneous removal of antibiotic and metal contaminants.
各种膨润土-污泥生物炭复合材料通过一系列加载和热解制备，用于从水溶液中同时去除诺氟沙星（NOR）和铜（Cu）。通过阳离子交换容量（CEC）、BET 比表面积（S）、SEM、XRD、FTIR 和 XPS 反映了获得的复合材料的形态和特性。等温吸附结果表明，Sips 吸附模型更适合于共吸附过程中 NOR 和 Cu 的吸附。在 25°C 的共吸附体系中，BT:2SB（膨润土与污泥的质量比为 1:2）对 NOR 和 Cu 的理论最大吸附容量分别为 89.36mg/g 和 104.10mg/g。热力学结果表明，NOR 和 Cu 的捕获是自发的，伴随着不同随机性的吸热反应。在共吸附体系中，由于竞争膨润土-污泥生物炭提供的羟基、羧酸和带负电荷的吸附位点，两者相互拮抗。本研究表明，利用天然矿物作为热解改良剂对污泥生物炭进行改性，可以生产出具有附加值的生物炭，用于同时去除抗生素和金属污染物。
