School of Civil Engineering, Shaoxing University, Shaoxing, 312000, Zhejiang, China.
School of Civil Engineering, College of Transportation Science & Engineering, Nanjing Tech University, Nanjing, 210009, China.
Environ Sci Pollut Res Int. 2023 Apr;30(16):47052-47064. doi: 10.1007/s11356-023-25473-z. Epub 2023 Feb 3.
The widespread production and application of graphene oxide (GO) may lead to its dispersion throughout natural water systems, with potential negative effects on living organisms and the ecological environment. This study used gypsum (G) as an adsorbent and examined different conditions (pH, adsorbent dosage, GO initial concentration) for the removal effect of GO by G. The results showed the best adsorption effect for a solution pH of 8.0, gypsum dosage of 60 mg, initial GO concentration of 80 mg·L, and temperature of 303 K; at this time, the maximum removal rate of graphene oxide by gypsum was 93.3%. It could be obtained by isotherm and thermodynamic analysis that the GO adsorption by gypsum conforms to the Langmuir isotherm model, it does not easily occur in high-temperature environments, and is a spontaneous exothermic process. In addition, experiments such as SEM, AFM, TGA, XRD, XPS, FTIR, Raman, and Zeta were used to adsorb graphene oxide by gypsum composites (G/GO), through which the mineral interactions with graphene oxides were microscopically characterized. The impact on the adsorption properties of contaminants provides new insights into contaminant removal by gypsum.
氧化石墨烯（GO）的广泛生产和应用可能导致其在自然水系中分散，对生物体和生态环境可能产生负面影响。本研究以石膏（G）为吸附剂，考察了不同条件（pH 值、吸附剂用量、GO 初始浓度）对 G 去除 GO 的效果。结果表明，溶液 pH 值为 8.0、石膏用量 60mg、GO 初始浓度 80mg·L 和温度 303K 时具有最佳的吸附效果；此时，石膏对氧化石墨烯的最大去除率为 93.3%。通过等温线和热力学分析可知，石膏对 GO 的吸附符合朗缪尔等温线模型，在高温环境下不易发生，是一个自发的放热过程。此外，还通过 SEM、AFM、TGA、XRD、XPS、FTIR、Raman 和 Zeta 等实验对石膏复合材料（G/GO）吸附氧化石墨烯进行了研究，通过这些实验从微观上表征了石膏与氧化石墨烯之间的相互作用。这为石膏去除污染物的吸附性能提供了新的见解。
