摘要
采用改进的Hummers法制备氧化石墨烯,采用超声-搅拌-共沉淀法制备出氢氧化锆/石墨烯(Zr(OH)4/rGO)复合材料,并利用氢氧化锆/石墨烯前驱体采用水热法制备氧化锆/石墨烯(ZrO_2/rGO)复合材料.通过Zr(OH)4/rGO、ZrO_2/rGO对磷酸根的吸附性能研究表明:两种吸附剂材料对PO_4^(3-)的吸附容量均随着pH值的升高而降低,吸附容量均随PO_4^(3-)浓度与溶液温度升高而升高.当pH值为2时,Zr(OH)4/rGO、ZrO_2/rGO对PO_4^(3-)最大吸附容量分别为81.84 mg/g、63.58 mg/g.Zr(OH)4/rGO与ZrO_2/rGO样品对PO_4^(3-)吸附过程均符合准二级动力学方程,等温吸附过程均满足Langmuir吸附等温方程.Zr(OH)4/rGO的再利用吸附PO_4^(3-)容量有所下降,而ZrO_2/rGO再生后吸附PO_4^(3-)容量与初次吸附性能相当.
In this work, graphene oxide （GO） was prepared by an improved Hummers method. Zirconia/gra- phene composites （ZrO2/rGO） were rapidly synthesized by hydrothermal method with Zr（ OH）4/rGO as pre- cursor prepared by ultrasound-stirred-coprecipitation. The adsorption capacity of Zr（ OH）4/rGO and ZrO2/ rGO composites decreased with the increase of pH value and increased with the increase of phosphate concen- tration and the solution temperature. The maximum adsorption capacities of Zr （OH）4/rGO and ZrO2/rGO composites were 81.84 mg/g and 63.58 mg/g respectively at pH 2.0. The adsorption kinetics of these two ad- sorbents accorded with the pseudo-second-order model and isothermal adsorption complied with the Langmuir isotherm equation. The results of its recycling properties showed the adsorption capacity decreased for the Zr （OH）4/rGO samples, while ZrO2/rGO samples were almost the same as the initial adsorption performance.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2017年第4期23-28,共6页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金青年基金资助项目(51602287)
