期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 291, 期 -, 页码 93-101出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.02.065
关键词
Graphene; Sulfuric acid doping; In situ polymerization; Removal of toxic Cr(VI); High adsorption capacity and good recycling ability
资金
- CSIR-SPM
- DST [SR/S2/CMP-0097/2012]
Sulfuric acid doped diaminopyridine polymers are synthesized in situ on graphene oxide surface via mutual oxidation-reduction technique. Exploiting large and highly porous surface, we have used this polymer composite as an adsorbent to remove high concentration of toxic Cr(VI) from water. It shows very high adsorption capacity (609.76 mg g(-1)) during removal process. The composite takes only 100 min to remove high concentration of 500 mg L-1 Cr(VI) from water. Interesting features for this material is the enhancement of removal efficiency at lower acidic condition due to the formation of acid doped emeraldine salt during polymerization. XPS and AAS measurements reveal that our prepared material mainly follows reduction mechanism at higher acidic condition while anions exchange mechanism at lower acidic condition during the removal experiments. Good recycling ability with similar to 92% removal efficiency after fifth cycle is also noticed for this material. Easy preparation, superior stability in acidic condition, remarkable removal efficiency and excellent recycling ability make this polymer composite an efficient material for modern filtration units in waste water purification. (C) 2015 Elsevier B.V. All rights reserved.
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