CAJ | 학술논문

为了探明氧化石墨烯吸附重金属离子的特性,采用改进的Hummers法,制备了氧化石墨烯(GO),采用FTIR、 Raman、 XRD、 XPS和AFM对其进行了表征。对比了不同溶液初始pH值、 Cu2+初始浓度、吸附时间、反应温度和离子强度下, GO对Cu2+的吸附效果。结果表明,氧化处理后, GO含有羧基、羟基和环氧基等含氧官能团, C、 O质量比达到2.0,厚度约为1.0 nm,层间距约为0.97 nm。 GO对Cu2+的吸附在90 min内达到平衡,其吸附容量在pH值小于6.0时随pH值的升高而升高,随温度的升高而升高,随Cu2+初始浓度的增大而增大。在298 K, pH值为5.5, Cu2+初始质量浓度为50 mg/L时, GO对Cu2+的平衡吸附容量为91.6 mg/g。 GO对Cu2+的吸附过程符合Langmuir等温吸附模型和准二级动力学模型,是均匀的单分子层吸附且由化学反应控制, GO对Cu2+的吸附是自发的吸热过程。
위료탐명양화석묵희흡부중금속리자적특성,채용개진적Hummers법,제비료양화석묵희(GO),채용FTIR、 Raman、 XRD、 XPS화AFM대기진행료표정。대비료불동용액초시pH치、 Cu2+초시농도、흡부시간、반응온도화리자강도하, GO대Cu2+적흡부효과。결과표명,양화처리후, GO함유최기、간기화배양기등함양관능단, C、 O질량비체도2.0,후도약위1.0 nm,층간거약위0.97 nm。 GO대Cu2+적흡부재90 min내체도평형,기흡부용량재pH치소우6.0시수pH치적승고이승고,수온도적승고이승고,수Cu2+초시농도적증대이증대。재298 K, pH치위5.5, Cu2+초시질량농도위50 mg/L시, GO대Cu2+적평형흡부용량위91.6 mg/g。 GO대Cu2+적흡부과정부합Langmuir등온흡부모형화준이급동역학모형,시균균적단분자층흡부차유화학반응공제, GO대Cu2+적흡부시자발적흡열과정。
In order to study the adsorption performance of graphene oxide(GO) on heavy metal ions, it was prepared by modified Hummers method and characterized by FTIR, Raman, XRD, XPS and AFM. The adsorption capability of GO on Cu2+under different pH values, initial Cu2+concentrations, adsorption time, reaction tempera-ture and ionic strength conditions was investigated. The results showed that, oxygen-containing groups (i.e., e-poxy, hydroxyl and carboxyl) were generated following oxidation. The C/O mass ratio was 2.0; the interlayer spacing and the thickness of GO were 0.97 and 1.0 nm respectively. The adsorption equilibrium of GO on Cu2+was obtained in 90 min, under the condition that the pH value was lower than 6.0, the adsorption capacity in-creased with the increasing pH value, temperature and initial Cu2+concentration. When the reaction temperature was 298 K, the pH value was 5.5, the initial mass concentration of Cu2+was 50 mg/L, the equilibrium adsorption capacity of GO on Cu2+ was 91.6 mg/g. The process of GO adsorbing Cu2+ fit Langmuir isothermal adsorption model and pseudo-second-order kinetic model. It was indicated that, the adsorption of GO on Cu2+was a homo-geneous monolayer chemisorption, which was also an endothermic and spontaneous process.