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|標題:||Removal of 2-chlorophenol from water using rice-straw derived ash||作者:||Chang, R.R.
|關鍵字:||Adsorption;chlorophenol;rice-straw derived carbon;water treatment;activated carbons;aqueous-solution;black carbon;adsorption;surface;chlorophenols;phenol;soils;husk;chemistry||Project:||Journal of Environmental Science and Health Part B-Pesticides Food Contaminants and Agricultural Wastes||期刊/報告no：:||Journal of Environmental Science and Health Part B-Pesticides Food Contaminants and Agricultural Wastes, Volume 46, Issue 2, Page(s) 128-136.||摘要:||
Removal of 2-chlorophenol from water using rice-straw derived ash (RSDA) was evaluated in this study to compare with commercial activated carbon. RSDA was obtained by burning rice-straw at 400 degrees C and 700 degrees C for 1 h. This ash can provide a better adsorbent for 2-chlorophenol. The adsorption capacities of RSDA at 400 degrees C and 700 degrees C are 37 and 52 mg g-1 at pH 4, respectively, and decrease to 9.0 and 40 mg g-1 at pH 10. Adsorption of either neutral or anionic 2-cholorphenol by the RSDA are shown as L-shaped nonlinear isotherms, suggesting surface adsorption rather than partitioning is occurring. At higher-burning temperatures, the surface area, porosity, point of zero charge and aromaticity of the resultant RSDA increase, but the oxygen content and surface acidity decrease. The combined effects result in a higher 2-chlorophenol adsorption of RSDA at 700 degrees C, which shows a slight pH effect on the adsorption of 2-chlorophenol, due to the lower content of oxygen-containing functional groups. Oxygen-containing functional groups contribute to surface acidity and H-bonding sites for adsorbed water, which compromises the interaction between 2-chlorophenol and the adsorbents. Thus, it suggests that rice-straw derived carbon (RSDC) can be used as an effective low-cost substitute material for activated carbon for removal of chlorophenols from wastewater.
|Appears in Collections:||土壤環境科學系|
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