Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 21, Issue 19, Pages 11552-11564Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-014-3025-2
Keywords
Cinnamomum camphora sawdust; Organic acid; Adsorption; Modification; Dye
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Funding
- National Water Pollution Control and Management Technology Major Project of China [2009ZX07212-001-02]
- National Natural Science Foundation of China [21276069, 71221061]
- Collaborative Innovation Center of Resource-Conserving & Environment-Friendly Society and Ecological Civilization
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Natural adsorbent (Cinnamomum camphora sawdust) modified by organic acid (oxalic acid, citric acid, and tartaric acid) was investigated as a potential adsorbent for the removal of hazardous malachite green (MG) dye in aqueous media in a batch process. The extent of MG adsorption onto modified sawdust increased with increasing organic acid concentrations, pH, contact time, and temperature but decreased with increasing adsorbent dosage and ionic strength. Kinetic study indicated that the pseudo-second-order kinetic model could best describe the adsorption kinetics of MG. Equilibrium data were found to fit well with the Langmuir model, and the maximum adsorption capacity of the three kinds of organic acid-modified sawdust was 280.3, 222.8, and 157.5 mg/g, respectively. Thermodynamic parameters suggested that the sorption of MG was an endothermic process. The adsorption mechanism, the application of adsorbents in practical wastewater, the prediction of single-stage batch adsorption system, and the disposal of depleted adsorbents were also discussed.
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