Activated carbon from a locally available and widespread tea waste source was fabricated, characterized and used as an efficient adsorbent for the removal of Ni2+ from aqueous solutions. The response surface methodology (RSM) and central composite design (CCD) were used to investigate the effect of the essential variables including initial concentration, adsorbent dosage and pH solution on the absorption of Ni2+. | Journal of Science and Technology 54 (4B) (2016) 251-259 REMOVAL OF Ni2+ FROM AQUEOUS SOLUTION BY ADSORPTION ONTO TEA WASTE–DERIVED ACTIVATED CARBON Long Giang Bach1, Bui Thi Phuong Quynh1, Van Thi Thanh Ho2, Nguyen Thi Thuong1, Dinh Thi Thanh Tam1, Trinh Duy Nguyen1, Tran Van Thuan1, * 1 NTT Institute of High Technology, Nguyen Tat Thanh University, 298–300A Nguyen Tat Thanh, Ho Chi Minh City, Vietnam 2 Hochiminh City University of Natural Resources and Environment, 236B Le Van Sy, Ho Chi Minh City, Vietnam * Email: tranvt@ Received: 16 August 2016; Accepted for publication: 10 November 2016 ABSTRACT Activated carbon from a locally available and widespread tea waste source was fabricated, characterized and used as an efficient adsorbent for the removal of Ni2+ from aqueous solutions. The response surface methodology (RSM) and central composite design (CCD) were used to investigate the effect of the essential variables including initial concentration, adsorbent dosage and pH solution on the absorption of Ni2+. The order polynomial regression equations–based model has been developed and found to be statistically significant by values of the coefficients of determination (R2) closer than and the P–values F Comment Model 9 , LOF (lack of fit), PR (pure .
