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将壳聚糖(CTS)、氧化石墨烯(GO)、3-巯基丙基三甲氧基硅烷(MPTMS)交联制得巯基改性壳聚糖-氧化石墨复合材料(SFCG).采用傅里叶变换红外光谱仪、扫描电子显微镜、元素分析仪对改性前后和吸附前后的材料进行表征.研究吸附剂投加量、温度、时间、初始浓度对吸附效果的影响.实验结果表明,SFCG与CTS相比结构发生很大变化,呈现薄层状结构,表面有褶皱.SFCG能够在短时间内选择性高效吸附Ag(Ⅰ),最大吸附量为578.41 mg·g~(-1).通过吸附等温线、吸附动力学、吸附热力学的研究发现,其吸附等温线符合Langumir吸附模型,为单层吸附;吸附过程符合准二级动力学模型,以化学吸附为主,同时吸附过程是自发的、放热的.另外,银是一种贵金属,因此,SFCG将在废水处理和回收贵金属等方面均表现出良好的应用前景.
The thiol-modified chitosan-graphite oxide composites (SFCG) were prepared by cross-linking chitosan (CTS), graphene oxide (GO) and 3- mercaptopropyltrimethoxysilane (MPTMS) The effects of the dosage of adsorbent, temperature, time and initial concentration on the adsorption performance were investigated by means of FT-IR, SEM and elemental analysis before and after modification.The experimental results showed that the adsorption capacities of SFCG and CTS Compared with the structure, it shows a thin layer structure and folds on the surface.FCM can selectively and efficiently adsorb Ag (Ⅰ) in a short period of time with the maximum adsorption capacity of 578.41 mg · g -1 .According to the adsorption isotherm , Adsorption kinetics and thermodynamics of adsorption show that the adsorption isotherm conforms to the Langumir adsorption model and is monolayer adsorption. The adsorption process accords with the quasi-second-order kinetic model, mainly by chemical adsorption, and the adsorption process is spontaneous and exothermic In addition, silver is a precious metal, so SFCG will have good application prospects in wastewater treatment and recovery of precious metals.