Response surface methodology modeling for methylene blue removal by chemically modified porous carbon: Adsorption mechanism and role of surface functional groups
Thuan Van Tran, Linh Xuan Nong, Hong-Tham T. Nguyen, Vinh Huu Nguyen, Duyen Thi Cam Nguyen, Thuong Thi Nguyen, Thuong Thi Nguyen, Phạm Quynh Trang, Dai Hai Nguyen, Trinh Duy Nguyen, Trinh Duy Nguyen
Abstract
The present study utilized chemically modified porous carbon (CMPC) as a robust adsorbent for MB treatment. The characteristic findings revealed the existence of many functional groups (C–O/C = O, C–C/C = C, C–OH, – COOH, C–C = O, etc.) on the surface of the high-defect structure of CMPC. Additionally, influential factors: methylene blue (MB) concentration (116–284 mg/L), CMPC dosage (0.16–1.84 g/L), and pH (3.6–10.4) were assessed by response surface methodology. By applying optimized conditions, the highest MB removal and adsorption capacity were confirmed at 90% and 181.82 mg/g, respectively. Role of surface functional groups in adsorption mechanisms was meticulously explained.