School of Biology, Food, and Environment, Hefei University, No. 99 Jinxiu Road, Hefei, 230601, China.
International (Sino-German) Joint Research Center for Biomass of Anhui Province, Hefei, 230601, China.
Environ Sci Pollut Res Int. 2022 Oct;29(46):70192-70201. doi: 10.1007/s11356-022-20828-4. Epub 2022 May 18.
To develop high-efficiency antibiotic adsorbents, β-cyclodextrin and dopamine hydrochloride were used to modify graphene oxide to prepare a new type of ternary composite material (β-cyclodextrin/dopamine hydrochloride-graphene oxide, CD-DGO). The material was characterized using scanning electron microscopy, Fourier infrared spectrometry, transmission electron microscopy, and specific surface area optical analysis. Two typical sulfonamides antibiotics (sulfamethoxazole, sulfadiazine) adsorption capacity were evaluated in terms of the dosage of composite materials, the ratio of each component, and the pH of the solution. We analyzed the adsorption characteristics via adsorption kinetics and adsorption isotherms, and then investigated the stability of the adsorbent through desorption and regeneration of the adsorbent. The results show that the adsorption effect of sulfonamides antibiotics is best at pH = 2; the adsorption kinetics conform to the pseudo-second-order kinetic model, and the adsorption equilibrium follows the Langmuir adsorption isotherm; the maximum adsorption capacity of CD-DGO for sulfamethoxazole and sulfadiazine is 144 mg·g and 152 mg·g, respectively. The material has good reusability, and the dominant force in the adsorption process is the π-π electron conjugation effect with hydrogen bonding. This offers a theoretical basis for the treatment of sulfonamides antibiotics water pollution.
为了开发高效的抗生素吸附剂，使用β-环糊精和盐酸多巴胺对氧化石墨烯进行改性，制备了一种新型三元复合材料（β-环糊精/盐酸多巴胺-氧化石墨烯，CD-DGO）。采用扫描电子显微镜、傅里叶红外光谱、透射电子显微镜和比表面积光学分析对材料进行了表征。通过复合材料用量、各组分比例和溶液 pH 值等方面评价了两种典型的磺胺类抗生素（磺胺甲恶唑、磺胺嘧啶）的吸附容量。通过吸附动力学和吸附等温线分析了吸附特性，然后通过吸附剂的解吸和再生研究了吸附剂的稳定性。结果表明，磺胺类抗生素的吸附效果在 pH = 2 时最佳；吸附动力学符合拟二级动力学模型，吸附平衡遵循朗缪尔吸附等温线；CD-DGO 对磺胺甲恶唑和磺胺嘧啶的最大吸附容量分别为 144 mg·g 和 152 mg·g。该材料具有良好的可重复使用性，吸附过程中的主要作用力是π-π电子共轭作用和氢键。这为处理磺胺类抗生素水污染提供了理论依据。
