College of Resources and Environmental Engineering, Guizhou University, Guiyang 50025, China.
College of Resources and Environmental Engineering, Guizhou University, Guiyang 50025, China.
J Environ Sci (China). 2023 Aug;130:174-186. doi: 10.1016/j.jes.2022.10.023. Epub 2022 Oct 25.
Antibiotic pollution has become a global eco-environmental issue. To reduce sulfonamide antibiotics in water and improve resource utilization of solid wastes, phosphogypsum modified biochar composite (PMBC) was prepared via facile one-step from distillers grains, wood chips, and phosphogypsum. The physicochemical properties of PMBC were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), Zeta potential, X-ray diffraction (XRD), etc. The influencing factors, adsorption behaviors, and mechanisms of sulfadiazine (SD) and sulfamethazine (SMT) onto PMBC were studied by batch and fixed bed column adsorption experiments. The results showed that the removal rates of SD and SMT increased with the increase of phosphogypsum proportion, while decreased with the increase of solution pH. The maximum adsorption capacities of modified distillers grain and wood chips biochars for SD were 2.98 and 4.18 mg/g, and for SMT were 4.40 and 8.91 mg/g, respectively, which was 9.0-22.3 times that of pristine biochar. Fixed bed column results demonstrated that PMBC had good adsorption capacities for SD and SMT. When the solution flow rate was 2.0 mL/min and the dosage of PMBC was 5.0 g, the removal rates of SD and SMT by modified wood chips biochar were both higher than 50% in 4 hr. The main mechanisms of SD and SMT removal by PMBC are hydrogen bonding, π-π donor-acceptor, electrostatic interaction, and hydrophobic interaction. This study provides an effective method for the removal of antibiotics in water and the resource utilization of phosphogypsum.
抗生素污染已成为全球性的生态环境问题。为了降低水中磺胺类抗生素的浓度并提高固体废弃物的资源利用率，通过简便的一步法，以酒糟、木屑和磷石膏为原料制备了磷石膏改性生物炭复合材料（PMBC）。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、Zeta 电位、X 射线衍射（XRD）等对 PMBC 的理化性质进行了表征。通过批量和固定床柱吸附实验研究了磺胺嘧啶（SD）和磺胺甲噁唑（SMT）在 PMBC 上的吸附行为和机理。结果表明，SD 和 SMT 的去除率随磷石膏比例的增加而增加，随溶液 pH 值的升高而降低。改性酒糟和木屑生物炭对 SD 的最大吸附容量分别为 2.98 和 4.18 mg/g，对 SMT 的最大吸附容量分别为 4.40 和 8.91 mg/g，分别是原生物炭的 9.0-22.3 倍。固定床柱实验结果表明，PMBC 对 SD 和 SMT 具有良好的吸附能力。当溶液流速为 2.0 mL/min，PMBC 用量为 5.0 g 时，改性木屑生物炭在 4 h 内对 SD 和 SMT 的去除率均高于 50%。PMBC 去除 SD 和 SMT 的主要机制是氢键、π-π供体-受体、静电相互作用和疏水相互作用。该研究为水中抗生素的去除和磷石膏的资源化利用提供了一种有效方法。
