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《Journal of Anhui Agricultural Sciences》 2012-15
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Experimental Study on the Production of Humic Acids from Brown Coal Using Hydrogen Peroxide

ZHANG Shui-hua et al(Key Laboratory for Development,Utilization and Pollution Control of Coal Resources of Yunnan Higher Education,Qujing,Yunnan 655011)  
[Objective] The study aimed to discuss the optimal conditions of producing humic acids from brown coal using hydrogen peroxide.[Method] Fulvic acid(FA) was prepared by using the brown coal from Qujing,Yunnan Province,and humic acids were extracted from the original brown coal and its residues respectively,then the dominate constituents of humic acids were obtained by using pH grading method,finally their chemical compositions were characterized by Fourier transform infrared spectrometry and functional group content.[Result] Coal-oxidant ratio affected the yield of FA most obviously,followed by oxidization temperature,and oxidant concentration had no obvious effect.The optimum conditions were determined as follows:coal-oxidant ratio was 1∶ 0.60,oxidization temperature was 45 ℃,oxidization duration was 210 min,and the concentration of hydrogen peroxide was 15%.Under the conditions,the yield of FA was up to 20.40%.Analysis of component properties indicated that the content of carboxyl and total acidic group in FA was improved obviously,and the content of active functional groups in OHA was higher than that of HA,while the dominate constituents of OHA during precipitation needed higher pH compared with those of HA.[Conclusion] The research provided a new method to prepare good humic acids using brown coal.
【Fund】: 云南省教育厅科学研究基金项目(08C0186)
【CateGory Index】: TQ536
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