Removal of lead and cadmium with an optimized composite of expanded graphite/g-C۳N۴/phenylenediamine
- سال انتشار: 1401
- محل انتشار: دوفصلنامه تحقیقات کاربردی در آب و فاضلاب، دوره: 9، شماره: 2
- کد COI اختصاصی: JR_ARWW-9-2_008
- زبان مقاله: انگلیسی
- تعداد مشاهده: 86
نویسندگان
Environmental Engineering, Water and Wastewater, Kish International Campus, University of Tehran, Tehran, Iran.
Department of Environmental Engineering, Graduate Faculty of Envirenment, University of Tehran, Tehran, Iran.
Department of Life Science Engineering, Faculty of New Science and Technology, University of Tehran, Tehran, Iran.
Department of Environmental Engineering, Graduate Faculty of Envirenment, University of Tehran, Tehran, Iran.
چکیده
In this study, an optimized composite of expanded graphite /g-C۳N۴ /phenylenediamine was synthesized and characterized by SEM, FESEM, EDS, XRD, and BET methods.The composite was prepared with an optimized combination using response surface methodology (RSM) as a proper adsorbent for eliminating heavy metals from water samples. The evaluation of the final adsorbent was accomplished by removing metal ions like Pb۲+ and Cd۲+. Under the optimum adsorption conditions for Pb۲+ and Cd۲+ (pH:۵, adsorbent dosage:۲ g/L, and Time:۶۰ min), elimination efficiencies were ۷۸.۴% for Cd۲+ and ۷۱.۳۵% for Pb۲+. pH was the most important factor that influenced the adsorption rate. A short contact time for maximum removal efficiency was reported because of the porous structure of the constructed composite. As a result of the absorptive construction, the equilibrium showed a satisfactory agreement with the Freundlich model. The kinetic evaluations showed that the adsorption process of both heavy metals fitted the pseudo-second-order model. Furthermore, the results of thermodynamic studies indicated that the adsorption was an endothermic and spontaneous process. A series of regeneration experiments (۵ cycles) was directed to evaluate the adsorbent reusability. The results presented that it was a suitable adsorbent for heavy metal uptake from aquatic solutions.کلیدواژه ها
Response Surface Methodology, Expanded graphite, Adsorption, Cadmium, Leadاطلاعات بیشتر در مورد COI
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