Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Rep. 2016 Dec 15;6:39108. doi: 10.1038/srep39108.
In this account, a one-step green hydrothermal method for zirconium-loaded reduced graphene oxide (RGO-Zr) adsorbent was developed in pure water. It is based on the formation of initially strong-coupling RGO-Zr nanocomposites followed by in situ reduction of GO to RGO during the hydrothermal treatment. The phosphate adsorption performance of the as-prepared nanocomposites was investigated in aqueous environment under various conditions. The characterization results of RGO-Zr nanocomposites showed that ZrO was successfully integrated onto the RGO sheets in amorphous. The data from equilibrium phosphate adsorption on RGO-Zr revealed that the adsorption kinetics followed a pseudo-second-order kinetic model, where the adsorption isotherm fitted the Langmuir isotherm model with a maximum adsorption capacity of 27.71 mg P/g at pH 5 and 298 K. The improved phosphate adsorption on RGO-Zr was caused by the dispersion of ZrO on the RGO surface. Furthermore, the phosphate adsorption was found insensitive to the increase in pH while it was sensitive to the increase in temperature. The coexisting anions of SO, F, Cl, NO and CO affected the phosphate adsorption in a different way. Results suggest that the present RGO-Zr adsorbent has the potential for controlling phosphorus pollution in water.
在本研究中，我们开发了一种在纯水中一步法制备负载锆的还原氧化石墨烯（RGO-Zr）吸附剂的绿色水热法。该方法基于在水热过程中GO 原位还原形成初始强耦合的 RGO-Zr 纳米复合材料。在各种条件下，我们在水溶液中研究了所制备的纳米复合材料对磷酸盐的吸附性能。RGO-Zr 纳米复合材料的表征结果表明，ZrO 成功地以非晶态形式负载在 RGO 片层上。RGO-Zr 对磷酸盐的吸附平衡数据表明，吸附动力学符合准二级动力学模型，吸附等温线符合 Langmuir 等温模型，在 pH 5 和 298 K 时最大吸附容量为 27.71mg P/g。RGO-Zr 对磷酸盐吸附性能的提高是由于 ZrO 在 RGO 表面的分散。此外，磷酸盐的吸附对 pH 的升高不敏感，而对温度的升高敏感。共存的阴离子 SO、F、Cl、NO 和 CO 以不同的方式影响磷酸盐的吸附。结果表明，本研究制备的 RGO-Zr 吸附剂具有控制水中磷污染的潜力。
