Journal
BIORESOURCE TECHNOLOGY
Volume 138, Issue -, Pages 191-197Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.03.146
Keywords
Bioadsorbent; Oxalic acid; Depleted bioadsorbents; Disposal; Swede rape straw (Brassica napus L.)
Funding
- National Specific Project for Water Pollution Control [2012ZX07101-004]
- Jiangsu Agriculture Science and Technology Innovation Fund (JASTIF) [CX (12) 3046]
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Swede rape straw (Brassica napus L) was modified by oxalic acid under mild conditions producing an efficient dye adsorbent (SRSOA). This low-cost and environmental friendly bioadsorbent was characterized by various techniques and then applied to purify dye-contaminated aqueous solutions. Equilibrium study showed that the Langmuir model demonstrated the best fit to the equilibrium data and the methylene blue (MB) adsorption capacity calculated by this model was 432 mg g(-1). The adsorption process and mechanism is also discussed. To properly deal with the dye-loaded bioadsorbents, the disposal methodology is discussed and a biochar based on depleted bioadsorbents was for the first time produced and examined. This method both solved the disposal problem of contaminant-loaded bioadsorbents and produced an useful adsorbent thereafter. The study indicates that SRSOA is a promising substitute for ACs in purifying dye-contaminated wastewater and that producing biochars from contaminant-loaded bioadsorbents maybe a feasible disposal method. (c) 2013 Elsevier Ltd. All rights reserved.
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