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苹果酸对高岭石中铝和硅释放的影响
胡华锋,王慧杰,王兴祥,介晓磊,李清曼
0
(郑州牧业工程高等专科学校,郑州 450011; 中国科学院南京土壤研究所,南京210008;黄淮学院生物工程系,驻马店 463000;中国科学院水生生物研究所,武汉 430072)
摘要:
采用间歇法(batch method)模拟研究水洗和酸洗高岭石在苹果酸溶液中的长期溶解效应及其相对溶解能力。结果表明,水洗和酸水高岭石反应液中Al、Si离子浓度均随苹果酸浓度的增加而升高,且酸洗高岭石中Al、Si离子更易释放;当苹果酸浓度为20 mmol·L-1时,反应936 h后,水洗高岭石Al、Si的释放量为0.51 mmol·L-1和0.57 mmol·L-1,分别是酸洗高岭石Al、Si释放量的86.44%和83.82%。高岭石反应前期表现为Si的优先释放,而在反应后期,高浓度苹果酸(≥20 mmol·L-1)反应液中高岭石Al、Si趋于同步释放。高岭石的溶解速率随苹果酸浓度的增加而提高,且酸洗高岭石的溶解速率大于水洗高岭石;在本研究浓度范围内,溶解速率未表现出对苹果酸浓度的饱和性,而显示了随其浓度增加的趋势。苹果酸能显著促进高岭石Al和Si的释放,且酸洗高岭石较水洗高岭石更易溶解。
关键词:  高岭石  苹果酸  同步性  溶解速率  酸洗  水洗
DOI:
基金项目:国家自然科学基金(40371067)和中国科学院知识创新工程项目(KZCX3-SW-417和ISSASIP0208)共同资助。
Effect of malic acid on aluminum and silicon release from kaolinite
HU Hua-feng,WANG Hui-jie,WANG Xing-xiang,JIE Xiao-lei,LI Qing-man
(Zhengzhou College of Animal Husbandry Engineering, Zhengzhou 450011; Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008;Department of Biological Engineering, Huanghuai University, Zhumadian 463000;Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072)
Abstract:
Experiment was conducted to investigate the long-time dissolution effects of water-eluviated and acid-eluviated kaolinite with batch method in malic acid solution. The results showed that malic acid significantly enhanced Al and Si release from kaolinite, and release of Al and Si from kaolinite increased with the increase of concentration of malic acid. Acid-eluviated kaolinite was more easily dissolved than that of water-eluviated kaolinite. When the concentration of malic acid was 20 mmol·L-1, after reaction for 936 hours, the release amount of Al and Si from water-eluviated kaolinite was 0.51 mmol·L-1 and 0.57 mmol·L-1, which were 86.44% and 83.82% of the release amount of Al and Si from acid-eluviated kaolinite. The preferential Si-release of kaolinite was observed initially, but at reaction anaphase, when the concentration of malic acid were less than 20 mmol/L, Al and Si showed stoichiometric release. Dissolution rate of kaolinite increased with the increase of concentration of malic acids, and dissolution rate of acid-eluviated kaolinite was higher than that of water-eluviated kaolinite; the dissolution rate didn’t show the character of saturation, and the dissolution rate indiated the increasing character of linearity; malic acid significantly enhanced Al and Si release from kaolinite, and the acid-eluviated kaolinite was more easily dissolved than water-eluviated kaolinite in the malic acids reactive solution.
Key words:  kaolinite  malic acid  stoichiometry  dissolution rate  acid-eluviated  water-eluviated

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