Citation: WANG Dong-Wei, SONG Yan-Xi, YE Xiao-Fan, QIAN Guo, WANG Shu-Yi, CHENG Zhen. Study on Adsorption of Two Sulfonamide Antibiotics by Graphene Oxide. Chinese Journal of Analytical Chemistry, 2018, 46(2): 211-216. doi: 10.11895/j.issn.0253-3820.171279 [复制]
Study on Adsorption of Two Sulfonamide Antibiotics by Graphene Oxide
采用改进的Hummers法制备得到氧化石墨烯（GO），以两种磺胺类抗生素—磺胺甲恶唑（SMZ）和磺胺甲基嘧啶（SMR）为探针分子，研究了氧化石墨烯的吸附特性。利用傅立叶变换红外光谱（FT-IR）和扫描电镜（SEM）对所制备的氧化石墨烯进行表征。考察了溶液pH值、吸附时间、初始浓度对氧化石墨烯吸附性能的影响，通过吸附动力学和吸附热力学对其吸附性能进行了研究。结果表明，酸性和碱性条件有利于氧化石墨烯对SMZ和SMR的吸附，当pH=1时吸附效果最佳；氧化石墨烯对SMZ和SMR吸附平衡时间分别为100和120 min，最大吸附容量分别为138.50和96.06 mg/g；吸附行为均符合准二级动力学方程，表明此吸附过程以化学吸附为主，与Langmuir等温方程式拟合度良好。氧化石墨烯作为富集分离材料用于湖水中SMZ和SMR的富集分离，获得了较好的结果。
Graphene oxide (GO) was prepared by modified Hummers method with graphite as raw materials and used as adsorbent for sulfamethoxazole (SMZ) and sulfamerazine (SMR) in aqueous solutions. The graphene oxide was characterized by fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). The effects of pH value, adsorption time, initial concentration and temperature on the adsorption property of GO to two sulfonamide antibiotics were investigated and combined with the physical and chemical properties of two kinds of antibiotics. The result showed the maximum adsorption capacity were 138.50 mg/g and 96.06 mg/g at pH=1, adsorbent dosage of 20 mg, 45℃, adsorption time of 100 min and 120 min for SMZ and SMR, respectively. The adsorption data of SMZ and SMR fitted well with the Pseudo-second-order kinetics model and the Langmuir isotherm model. The adsorption properties of GO were evaluated with lake water and tap water as real samples and good results were obtained. GO could be used as enrichment and separation materials for sample pretreatment and removing pollutant in wastewater.
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