高能GO/ TiO2制备及其光催化反渗透浓水性能

为高效率处理反渗透浓水，采用改良Hummers法、水热合成法制备具有良好的吸附以及光催化性能的氧化石墨烯/具有高能暴露面二氧化钛纳米复合材料（GO/TiO2），通过扫描电镜（SEM）、X射线衍射（XRD）表征其微观形貌和物相组成；并以模拟反渗透浓水探究其性能、较佳反应条件及具有协同效应。结果表明，纳米材料中二氧化钛粒子的高能暴露面增多，有助于有效地提高其光催化活性，粒子的晶化度有所增加且均匀附着在氧化石墨烯表面，不仅增大了粒子的比表面积，还降低了二氧化钛粒子的宽带隙能，有助于提高其光催化效率；同时，由于氧化石墨烯接收的二氧化钛受激发释放的光生电子的存在，氧化石墨烯对重金属离子的静电吸附能力显著增强，提高了氧化石墨烯去除重金属离子的效率；所制备的氧化石墨烯/具有高能暴露面二氧化钛纳米复合材料具有良好的处理反渗透浓水性能，氧化石墨烯含量为80 mg的纳米复合材料与pH调节至4的模拟反渗透浓水在室温下避光搅拌3 h、光催化反应1.5 h为较佳反应条件，该纳米复合材料的Pb2+、Cd2+、Cr6+去除率分别为32.2%、19.8%、11.7%，具有协同效应。

Preparation of High Energy GO/TiO2 and Study on Its Performance of Photocatalytic Reverse Osmosis Concentrated Water

In order to treat reverse osmosis concentrated water with high efficiency, the modified Hummers method and hydrothermal synthesis method were used to prepare graphene oxide/high-energy exposed surface titanium dioxide nanocomposite (GO/TiO2) with good adsorption and photocatalytic properties, and by scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the microstructure and phase composition. The performance, better reaction conditions and synergistic effects were investigated by simulating reverse osmosis concentrated water. The results show that the increase of the high energy exposure surface of the titanium dioxide particles in nanomaterials is helpful to improve the photocatalytic activity of the particles effectively. The crystallinity of the particles is increased and the particles are attached to the surface of graphene oxide evenly. It not only increases the specific surface area of the particles, but also reduces the band gap energy of the titanium dioxide particles, and helps to improve the particle size of the particles. At the same time, the ability of graphene oxide to adsorb heavy metal ions greatly enhanced the efficiency of the removal of heavy metal ions by graphene oxide because of the presence of photogenerated electrons stimulated by graphene oxide received by graphene oxide; The prepared GO/TiO2 has good treatment of reverse osmosis concentrated water performance and the content of graphene oxide was 80mg, the nanoscale composite materials and the simulated reverse osmosis water with pH to 4 are better to avoid light stirring at room temperature for 3h and the photocatalytic reaction for 1.5 h. The Pb2+, Cd2+ and Cr6+ removal rates of the nanocomposites are 32.2%, 19.8% and 11.7%. The high energy GO/TiO2 has synergistic effect.