Journal
JOURNAL OF CLEANER PRODUCTION
Volume 210, Issue -, Pages 366-375Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2018.11.041
Keywords
Activated carbon; Wheat bran; NaOH activation; Industrial furnace; Specific surface area; Cost
Categories
Funding
- Fundamental Research Funds for Central Universities of Central South University [2017zzts108]
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Waste of wheat bran was used for the first time to prepare activated carbon with high specific surface area via sodium hydroxide activation. The effects of activation temperature (700-900 degrees C) and NaOH mass ratio (1-5) on surface area were studied. Products were characterized by thermal analysis, nitrogen adsorption-desorption, X-ray diffraction, infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. One development model was used to explain the evolution of pore structure. The product synthesized at 800 degrees C with mass ratio of 4 possessed the largest surface area of 2543 +/- 89 m(2)/g with low ash content of 0.68 +/- 0.03 wt%. For liquid adsorption of methylene blue, the maximum adsorption capacity was recorded as 887.3 +/- 24.9 mg/g, higher than 663.8 +/- 14.8 mg/g for commercial coconut shell carbon. Adsorption data were fitted well with the Redlich-Peterson isotherm and pseudo-second order model, closing to surface area. Cost of carbon production using industrial furnace was calculated as 3.56 +/- 0.18 $/kg (reduced 32.4% than tube furnace), with output of 1.28 +/- 0.07 kg/d (improved 11.8 times). It could be demonstrated that wheat bran was an effective and sustainable raw material to obtain low cost carbon product with high surface area, indicating its potential utilization. (C) 2018 Elsevier Ltd. All rights reserved.
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