Facile modification of activated carbon with highly dispersed nano-sized α-Fe2O3 for enhanced removal of hexavalent chromium from aqueous solutions
- Resource Type
- Authors
- Tan Xueyun; Jingjing Gu; Jinhua Wu; Li Bing; Penchi Chiang; Ping Li; Weizhao Yin; Meng Xu
- Source
- Chemosphere. 224:220-227
- Subject
- Environmental Engineering
Health, Toxicology and Mutagenesis
0208 environmental biotechnology
Kinetics
chemistry.chemical_element
Nanoparticle
02 engineering and technology
010501 environmental sciences
01 natural sciences
Nanomaterials
chemistry.chemical_compound
Chromium
Adsorption
medicine
Environmental Chemistry
Hexavalent chromium
0105 earth and related environmental sciences
Aqueous solution
Public Health, Environmental and Occupational Health
General Medicine
General Chemistry
Pollution
020801 environmental engineering
chemistry
Nuclear chemistry
Activated carbon
medicine.drug
- Language
- ISSN
- 0045-6535
Activated carbon-coated α-Fe2O3 nanoparticles (nFe2O3@AC) were synthesized by a facile impregnation method to enhance hexavalent chromium (Cr(VI)) removal from water. The SEM images confirmed that α-Fe2O3 particles ranging from 90 to 500 nm were dispersedly loaded on the AC, which successfully amended Cr(VI) removal. The nFe2O3@AC was able to remove Cr(VI) with a 3 times higher efficiency of 94% in comparison with the AC. After adsorption, Cr(VI) reduction coupled with AC oxidation and low soluble (CrxFe1-x)(OH)3 precipitates were eventually formed. The Cr(VI) removal process was pH-dependent and could be well fitted to pseudo second-order kinetics. The nFe2O3@AC could be easily regenerated by 0.1 M HCl and showed a good stability as an 80% Cr(VI) removal efficiency was recorded after 4 desorption-adsorption cycles. In addition, this composite had a promising potential for repeated utilization because the AC of the adsorbed nFe2O3@AC could be refreshed and remodified with nFe2O3 after stripping all the nFe2O3 and (CrxFe1-x)(OH)3 precipitates from its surface by 1 M HCl and a Cr(VI) removal efficiency of 86% could be achieved. Our results demonstrated that the use of nFe2O3 is an efficient and promising method to modify AC and enhance Cr(VI) removal form aqueous solutions.