Azizkhani Sepehr, Hussain Siti Aslina, Abdullah Norhafizah, Ismail Mohd Halim Shah, Mohammad Abdul Wahab
Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, 43400 UPM, Selangor Malaysia.
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, 43600 UKM, Selangor Malaysia.
J Environ Health Sci Eng. 2021 Feb 26;19(1):491-502. doi: 10.1007/s40201-021-00622-z. eCollection 2021 Jun.
The functionalized graphene oxide by silica and chitosan helped to prepared an adsorbent with high adsorption potential for removing cadmium(II). In this study, the adsorbent was synthesized and the batch system of adsorption method was examined to find the potential of the new adsorbent with the various factors of the concentration, pH, time and temperature. The characterization of adsorbent was analyzed by FT-IR, TEM, Zeta potential and XRD analysis. Regards to the analysis it can be understood that the adsorbent was synthesized successfully. The investigational results were validated and analyzed by applying the 5 models of isotherm and 4 models of kinetic. The Langmuir, Freundlich, Temkin, Harkins-Jura and Dubinin-radushkevich models were used which the Langmuir, Freundlich and Temkin fitted well for removing cadmium(II). The Q value was achieved 126.58 mg/g by using the Langmuir model for removing Cd(II) respectively. The pseudo-first-order, pseudo-second-order, Elovich and Intra-particle models were used to validate the kinetic models of the process. The pseudo-second-order and Elovich models were the best fitted kinetic model in this investigation. Thermodynamic parameters of the energy of gibes, the enthalpy, and the entropy were calculated. Generally, the adsorption process was distinguished as an exothermic and spontaneous.
二氧化硅和壳聚糖功能化的氧化石墨烯有助于制备一种对去除镉（II）具有高吸附潜力的吸附剂。在本研究中，合成了吸附剂，并采用分批吸附系统，研究了浓度、pH值、时间和温度等各种因素对新型吸附剂吸附潜力的影响。通过傅里叶变换红外光谱（FT-IR）、透射电子显微镜（TEM）、Zeta电位和X射线衍射（XRD）分析对吸附剂进行了表征。通过分析可知吸附剂合成成功。应用5种等温线模型和4种动力学模型对研究结果进行了验证和分析。使用了朗缪尔（Langmuir）、弗伦德里希（Freundlich）、坦金（Temkin）、哈金斯-尤拉（Harkins-Jura）和杜宾宁-拉杜舍维奇（Dubinin-radushkevich）模型，其中朗缪尔、弗伦德里希和坦金模型对去除镉（II）拟合良好。使用朗缪尔模型去除Cd（II）时，Q值分别达到126.58 mg/g。使用准一级、准二级、埃洛维奇（Elovich）和颗粒内扩散模型对该过程的动力学模型进行了验证。准二级和埃洛维奇模型是本研究中拟合最好的动力学模型。计算了吉布斯自由能、焓和熵的热力学参数。一般来说，吸附过程被认为是放热和自发的。
