Development of Response Surface Methodology for Optimization of Congo Red Adsorption Utilizing Exfoliated Graphite As An Efficient Adsorbent

• Main Authors: Van Pham, Thinh, Van Tran, Thuan, Duy Nguyen, Trinh, Thi Hong Tham, Nguyen, Thanh Tri Quang, Phan, Thi To Uyen, Dao, Thi Hong Le, Nhan, Vo, Dai-Viet N., Trung Thanh, Nguyen, Giang Bach, Long
• Format: Conference Proceeding
• Language: English
• Subjects: Central Composite Design (CCD); Congo Red Adsorption; Exfoliated Graphite; Response surface methodology (RSM)
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2020.03.356

In the present study, we developed an optimization model of CR adsorption onto EG using response surface methodology (RSM) as a statistical tool. The EG was structurally characterized using several techniques such as scanning electron microscope (SEM), estimation of N2 adsorption/desorption isotherm and plotting of pore size. The EG was used as adsorbent to remove the CR from water. Three variables involving concentration (20-50 mg/L), pH (4-10), adsorption time (0-210 min) were investigated. To find out the optimal condition, we adopted Design Expert software-based RSM for the experimental design, 3D surface plotting, and optimization. The optimal results were found at concentration of 48.3 mg/L, and contact time of 188 min for the highest CR adsorption capacity at 53.423 mg/g. With high compatibility via confirmation test, it is suggested that the RSM can be the suitable method to optimize the adsorption of CR onto EG