Objective] This study aimed to eliminate the negative effects brought about by continuous, long-term accumulation of sodium ions in soil on soil environ-ment. [Method] Biological humic acids （BHAs） were extracted fr...Objective] This study aimed to eliminate the negative effects brought about by continuous, long-term accumulation of sodium ions in soil on soil environ-ment. [Method] Biological humic acids （BHAs） were extracted from fermented furfural residue via alkali-dissolution and acidification. The effects of solid-liquid ratio （mass ratio of fermented furfural residue to water）, alkali concentration, extraction tempera-ture and extraction time on the content of BHA were investigated. Also its structure was characterized by FTIR. [Result] The optimal extraction conditions were as fol-lows： solid-liquid ratio of 1：7, KOH concentration of 6%, extraction temperature of 70℃ and extraction time of 1 h. Under the optimal conditions, the content of BHAs extracted was up to 8.5%. The infrared spectrum analysis indicated that BHA had more types of functional groups and lower molecular weight than commercial humic acid although they had similar structures. [Conclusion] The technique has the ad-vantages of simple operation and good stability, and is suitable for extracting BHAs. BHAs have a good prospect in developing new types of humic acid fertilizers.展开更多
[Objective] This study was conducted to obtain the optimal process for the preparation of biological humic acids （BHAs） from fermented furfural residue by al- kali-dissolution and acidification. [Method] BHAs were e...[Objective] This study was conducted to obtain the optimal process for the preparation of biological humic acids （BHAs） from fermented furfural residue by al- kali-dissolution and acidification. [Method] BHAs were extracted from fermented furfural residue by the alkali-dissolution and acidification method, to investigate the effects of solid-liquid ratio （mass ratio of fermented furfural residue to water）, alkali concentration, extraction temperature and extraction time on the extraction rate of BHAs by an orthogonal experiment, and then a solid BHA product was obtained by acidification of its extract followed by solid-liquid separation and oven-drying. [Result] The results showed that the optimal extracting conditions were as follows： solid-liquid ratio of 1：8, alkali concentration of 8% KOH, with extracting temperature at 70℃ and extracting time of 2.5 h in the alkali-dissolution step, and in the acidification step, the pH of the BHA mixture was 2.5. Under the optimal conditions, the content of solid BHAs was 76%, and the extraction rate of BHAs was 49%. [Conclusion] This study provides a theoretical basis for the separation and purification of BHAs from fermented furfural residue by the alkali dissolution and acidification method.展开更多
文摘Objective] This study aimed to eliminate the negative effects brought about by continuous, long-term accumulation of sodium ions in soil on soil environ-ment. [Method] Biological humic acids （BHAs） were extracted from fermented furfural residue via alkali-dissolution and acidification. The effects of solid-liquid ratio （mass ratio of fermented furfural residue to water）, alkali concentration, extraction tempera-ture and extraction time on the content of BHA were investigated. Also its structure was characterized by FTIR. [Result] The optimal extraction conditions were as fol-lows： solid-liquid ratio of 1：7, KOH concentration of 6%, extraction temperature of 70℃ and extraction time of 1 h. Under the optimal conditions, the content of BHAs extracted was up to 8.5%. The infrared spectrum analysis indicated that BHA had more types of functional groups and lower molecular weight than commercial humic acid although they had similar structures. [Conclusion] The technique has the ad-vantages of simple operation and good stability, and is suitable for extracting BHAs. BHAs have a good prospect in developing new types of humic acid fertilizers.
文摘[Objective] This study was conducted to obtain the optimal process for the preparation of biological humic acids （BHAs） from fermented furfural residue by al- kali-dissolution and acidification. [Method] BHAs were extracted from fermented furfural residue by the alkali-dissolution and acidification method, to investigate the effects of solid-liquid ratio （mass ratio of fermented furfural residue to water）, alkali concentration, extraction temperature and extraction time on the extraction rate of BHAs by an orthogonal experiment, and then a solid BHA product was obtained by acidification of its extract followed by solid-liquid separation and oven-drying. [Result] The results showed that the optimal extracting conditions were as follows： solid-liquid ratio of 1：8, alkali concentration of 8% KOH, with extracting temperature at 70℃ and extracting time of 2.5 h in the alkali-dissolution step, and in the acidification step, the pH of the BHA mixture was 2.5. Under the optimal conditions, the content of solid BHAs was 76%, and the extraction rate of BHAs was 49%. [Conclusion] This study provides a theoretical basis for the separation and purification of BHAs from fermented furfural residue by the alkali dissolution and acidification method.
