氧化石墨烯-聚合羟基铝复合材料的合成及其对Cd(Ⅱ)的去除效果
Synthesis of graphite oxide-polymeric aluminum hydroxyl composites and their removal effects for Cd(Ⅱ)

为制备高效Cd(Ⅱ)吸附剂,首先,采用正向滴定法将聚合羟基铝(Al13)加入到氧化石墨烯(GO)的悬浮液中,以GO为基体制备了氧化石墨烯-聚合羟基铝复合材料(GO-Al13);然后,利用XRD、FTIR和SEM等分析技术对GO-Al13进行表征,并将10 mg GO-Al13添加至50 mL初始浓度为10 mg/L的Cd(Ⅱ)废水中进行吸附实验,研究了GO-Al13对Cd(Ⅱ)的去除效果。结果表明:[Al13]7+离子会与GO的含氧官能团发生作用,产生Al-O基团;将[Al13]7+离子加入到GO中后, GO-Al13的表面形貌与GO相比会发生较大改变,出现不规则的凹凸结构,且粗糙程度也大幅度增加;当废水中Cd(Ⅱ)的初始浓度为10 mg/L、初始pH为6.0时,去除率可达98.92%。所得结论显示GO-Al13对Cd(Ⅱ)的去除效果较好。 In order to prepare efficient absorbent for Cd(Ⅱ), polymeric aluminum hydroxyl (Al13) was added into the dispersion of graphite oxide (GO) by direct titration method firstly, and graphite oxide-polymeric aluminum hydroxyl composites (GO-Al13) were synthesized using GO as the matrix. Then, analysis technology such as XRD, FTIR, SEM and so on were used to characterize GO-Al13, and 10 mg GO-Al13 was added into 50 mL Cd(Ⅱ) waste water whose initial concentration was 10 mg/L to conduct the adsorption experiments, thus the removal effects of GO-Al13 on Cd(Ⅱ) were investigated. The results show that [Al13]7+ ions will react with oxygen-containing functional groups of GO to form Al-O groups. After adding [Al13]7+ ions into GO, the surface morphologies of GO-Al13 will change a lot comparing with GO, irregular concave-convex structures emerge and roughness increases significantly. When the initial concentration of Cd(Ⅱ) in waste water is 10 mg/L and initial pH is 6.0, the removal rate can reach 98.92%. The conclusions obtained indicate that the removal effects of GO-Al13 for Cd(Ⅱ) is preferable. 江苏大学高级人才基金(10JDG114)