Removal of Cadmium (II) from aqueous solutions onto Dodonaeae Viscose Leg powder using a green process: Isotherms, Kinetics and Thermodynamics
- سال انتشار: 1398
- محل انتشار: فصلنامه انرژی و محیط زیست ایران (ایرانیکا)، دوره: 10، شماره: 1
- کد COI اختصاصی: JR_IJEE-10-1_002
- زبان مقاله: انگلیسی
- تعداد مشاهده: 375
نویسندگان
Chemistry Department, Faculty of Science, Sebha University, Sebha, Libya
Chemistry, Science, Sebha University. Sebha, Libya
Department of Chemistry, Faculty of Science, Sebha University, Sebha Libya
چکیده
In the present study, batch adsorption experiments of hazardous cadmium ions, Cd(II), onto low-cost Dodonaeae Viscose Legs (DVLs) surface were conducted with respect to contact time, solution pH, adsorbent dosage, initial Cd concentration and temperature. Sorption isotherm, kinetic and thermodynamic models were used to describe the equilibrium stage and their constants were determined. The DVLs were used without chemical or physical activation processes. The results showed that the optimum adsorption capacity of DVLs for Cd(II) ions was found to be 25.29 mg/g at solution pH 5.26, 50 min and 303K. DVL adsorption data was fitted well with Langmuir isotherm. The mean free energy was found to be 1.82E-02 using Dubinin-Radushkevich (DRK) isotherm, which indicates that the adsorption of Cd(II) ions onto DVL surface is physical adsorption. The activation energy (Ea) was 3.06 kJ/mol, which confirms that Cd(II)-DVL adsorption process is physical sorption. Pseudo-first-order, pseudo-second-order, Elovich, intra-particle and extra-particle diffusion models were used to describe the adsorption kinetics. The results show strong correspondence to a pseudo-second-order kinetics. Thermodynamic parameters suggested that the adsorption of Cd(II) ions onto DVL surface is an exothermic process.کلیدواژه ها
Adsorption, Isotherms, Kinetics, Thermodynamics, Dodonaeae Viscose Legsاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.