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GO/TiO2复合纳米材料对四环素的吸附作用及其再生效果研究
祝林,许子牧
0
(合肥工业大学资源与环境工程学院,合肥 230009)
摘要:
采用Hummers法制备的氧化石墨烯利用水热法获得氧化石墨烯(graphene oxide, GO)负载二氧化钛(titanium dioxide, TiO2)复合材料(GO-TiO2), 采用X射线衍射(X-ray diffraction,XRD)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)、扫描电子显微镜(scanning electron microscopy,SEM)、氮气吸附-脱附、Zeta电位等方法对材料进行表征。研究接触时间、温度、溶液pH值、初始TC浓度和离子强度等条件对GO-TiO2吸附四环素(Tetracycline,TC)性能的影响,并考察 DBD等离子降解处理后吸附剂的再生效率。结果表明,GO-TiO2复合材料对TC具有良好的吸附性能,并且该吸附过程受溶液pH和离子强度影响显著。此外,该吸附过程是一种单层的化学吸附和自发吸热过程。DBD等离子体对GO-TiO2和GO 表面的TC处理后,由于TiO2的催化作用使得GO-TiO2再生效果比GO更好,并且再生后的GO-TiO2在溶液中对TC仍有很高的吸附能力。
关键词:  氧化石墨烯  吸附  四环素  再生
DOI:10.13610/j.cnki.1672-352x.20200113.017
投稿时间:2019-03-19
基金项目:国家自然科学基金(51807046), 安徽省自然科学基金(1708085MB47)和医学物理与技术安徽省重点实验室开放基金项目(LMPT2017Y7BP0U1581)共同资助。
Adsorption performance of tetracycline by GO/TiO2 composites and their regeneration capacity
ZHU Lin,XU Zimu
(School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009)
Abstract:
In this research, Graphene oxide prepared by Hummers is used to loaded with titanium dioxide composites (GO-TiO2) by hydrothermal method. Material characterizations were carried out by using the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), BET and Zeta in details. The effects of contact time, temperature, solution pH, initial TC concentration and ionic strength on the adsorption of Tetracycline (TC) on GO-TiO2 were investigated, and investigated the regeneration efficiency of the adsorbent after DBD plasma degradation treatment. Experimental results showed that the GO-TiO2 composites have significantly high adsorption capacity on TC, and the adsorption process is significantly affected by the pH and ionic strength of the solution. In addition, the adsorption process is monolayer chemical adsorption with spontaneous nature and endothermic. After the treatment of GO-TiO2 and GO surface TC by DBD plasma, the regeneration effect of GO-TiO2 is better than that of GO due to the catalytic effect of TiO2, and the regenerated GO-TiO2 still showed a high adsorption affinity for TC in solution.
Key words:  graphene oxide  adsorption  tetracycline  regeneration

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