Bài viết trình bày kết quả tổng hợp vật liệu cacbon từ tính giàu cacboxylat (Fe3O4@CRC) và sử dụng vật liệu này để hấp phụ ion niken (Ni(II)) và xanh methylen (MB) trong dung dịch nước. Fe3O4@CRC được tổng hợp bằng phương pháp cacbon hóa ở nhiệt độ thấp hỗn hợp gồm sắt (III) clorua và natri gluconat. | VNU Journal of Science Earth and Environmental Sciences Vol. 37 No. 2 2021 55-68 Original Article Study on Adsorption of Nickel and Methylene Blue in Aqueous Solution by Magnetic Carboxylate-Rich Carbon Doan Van Dat1 Nguyen Hoai Thuong1 Tran Thi Kieu Ngan2 Le Thi Thanh Nhi2 3 Dao My Uyen2 3 Nguyen Thi Huong1 Cong Hong Hanh4 Le Van Thuan2 3 1 Industrial University of Ho Chi Minh City 12 Nguyen Van Bao Ho Chi Minh City Vietnam 2 Duy Tan University 03 Quang Trung Da Nang city Vietnam 3 Institute of Research and Development Duy Tan University 03 Quang Trung Da Nang city Vietnam 4 Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam Received 12 March 2020 Revised 24 August 2020 Accepted 29 August 2020 Abstract In this study magnetic carboxylate-rich carbon material Fe3O4@CRC was synthesized via a low-temperature carbonization method and applied as an adsorbent for adsorption of Ni II ions and methylene blue MB in aqueous solution. The synthesized Fe3O4@CRC was characterized by various techniques XRD FTIR FE-SEM TEM EDX VSM and BET . The adsorption kinetics isotherms thermodynamics and the effects of key adsorption factors including the pH value initial adsorbate concentration contact time adsorbent dose and temperature were investigated in detail. The results showed that Fe3O4@CRC exhibited a high adsorption capacity for MB and Ni II with the maximum adsorption capacity of mg g and mg g respectively. The adsorption of MB and Ni II on Fe3O4@CRC was a spontaneous and endothermic process and was best described with the first-order kinetic model Freundlich for MB and Langmuir for Ni II isotherm models. In addition Fe3O4@CRC could maintain a high adsorption capacity after many consecutive cycles. Therefore the Fe3O4@CRC material can be used as a highly efficient adsorbent for the removal of heavy metals and dyes from wastewater due to the advantages of high adsorption performance easy separation and good .
