Remediation of Cr(VI) via combined self-reduction and adsorption by chemically modified carbon sorbents

Authors : MOHAMED E. MAHMOUD, AMR. A. YAKOUT, ASMAA M. HALBAS, MAHER M. OSMAN

Pages : 906-920

View : 11 | Download : 3

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Hexavalent chromium, Crinsert ignore into journalissuearticles values(VI);, is a highly toxic species, while trivalent chromium, Crinsert ignore into journalissuearticles values(III);, is an essential trace element for humans and other organisms. In the present work, a simple, rapid, and efficient procedure for water treatment of Crinsert ignore into journalissuearticles values(VI); is described. Active carbon insert ignore into journalissuearticles values(AC); was chemically treated with HCl and NaOH for the formation of surface modified Acidic-AC and Basic-AC sorbents, respectively. In addition, AC sorbent was treated with HNO$_{3}$ as an oxidizing agent and sodium sulfite as a reducing agent for the formation of Ox-AC and Rd-AC sorbents, respectively. The modified AC sorbents were tested to identify their potential applications in removal of Crinsert ignore into journalissuearticles values(VI); under various controlling factors using the batch technique. The results indicated that these sorbents can be used in water treatment due to their excellent and efficient reduction of Crinsert ignore into journalissuearticles values(VI); into Crinsert ignore into journalissuearticles values(III); with percentage transformation values in the range of 90%-100%. Acidic-AC was found to be the superior sorbent in the reduction process of Crinsert ignore into journalissuearticles values(VI);. The produced Crinsert ignore into journalissuearticles values(III); was removed from aqueous solutions via adsorption on the surface of these sorbents. The reduction and adsorption processes of Crinsert ignore into journalissuearticles values(VI);-Crinsert ignore into journalissuearticles values(III); were evaluated and optimized under different experimental parameters. The potential applications of these sorbents in real water treatment were also explored.
Keywords : Cr VI, , active carbon, reduction, adsorption, water treatment