Journal
WATER RESEARCH
Volume 47, Issue 9, Pages 3037-3046Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.03.027
Keywords
Graphene oxide; Flocculent; Water treatment; Flocculation mechanism
Funding
- Key Natural Science Foundation of China [51073077]
- Open Fund from State Key Laboratory of Pollution Control and Resource Reuse of Nanjing University [PCRRF11004]
- Scientific Research Foundation of Graduate School of Nanjing University [2012CL06]
- Research and Innovation Project for Graduates of Jiangsu Province [CXZZ12_0034]
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The application of nanomaterials in water treatment plants has attracted significant attention recently. This study investigates the possibility of using graphene oxide (GO) as a novel flocculent to remove contaminants with different surface charges from water, including two particulate ones (kaolin and hematite) and two soluble ones (humic acid (HA) and cationic light yellow 7GL dye (7GL)). The flocculation performances of traditional polyaluminum chloride (PAC) and original graphite were also tested for comparison. Fractal theory was applied to evaluate the floc properties and explore the flocculation mechanism in combination with zeta potential measurements. For negatively charged contaminants, kaolin and HA, GO was observed to remove these contaminants successfully via the sweeping flocculation effect under acidic and neutral conditions. However, GO was less efficient than PAC. For positively charged contaminants, hematite and 7GL, the flocculation performances of GO were significantly improved than those of PAC via patching effect for hematite suspension and charge neutralization effect for 7GL solution. The results highlighted the extensive potential applicability of GO as a suitable flocculant in water treatment. (C) 2013 Elsevier Ltd. All rights reserved.
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