Journal
BIORESOURCE TECHNOLOGY
Volume 274, Issue -, Pages 134-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.11.048
Keywords
Chitosan/graphene oxide aerogel; Ice-templating; Metanil yellow dye; Adsorption
Funding
- Ministry of Higher Education (MOHE), Malaysia under the Fundamental Research Grant Scheme [FRGS/1/2015/SG06/UNIM/02/1]
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Graphene oxide/chitosan aerogel (GOCA) was prepared by a facile ice-templating technique without using any cross-linking reagent for metanil yellow dye sequestration. The adsorption performance of GOCA was investigated by varying the adsorbent mass, shaking speed, initial pH, contact time, concentration and temperature. The combined effects of adsorption parameters and the optimum conditions for dye removal were determined by response surface methodology. GOCA exhibited large removal efficiencies (91.5-96.4%) over a wide pH range (3-8) and a high adsorption capacity of 430.99 mg/g at 8 mg adsorbent mass, 400 mg/L concentration, 35.19 min contact time and 175 rpm shaking speed. The adsorption equilibrium was best represented by the Langmuir model. GOCA could be easily separated after adsorption and regenerated for re-use in 5 adsorption-desorption cycles thereby maintaining 80% of its adsorption capability. The relatively high adsorption and regeneration capabilities of GOCA render it an attractive adsorbent for treatment of azo dye-polluted water.
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