化学氧化剂(H_2O_2、NaOCl)作用下高岭土-胡敏酸复合体中有机碳的稳定性  

The stabilization of organic carbon in humic acid-kaolin complex by chemical oxidants

作　　者：张梦妍[1] 包承宇 陈静文[1] 吴敏[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500

出　　处：《环境化学》2014年第7期1149-1154,共6页Environmental Chemistry

基　　金：国家自然科学基金(41222025;41273138)资助

摘　　要：通过干湿交替条件制备高岭土-胡敏酸有机无机复合体,采用H2O2、NaOCl两种氧化剂分别对胡敏酸以及其制备的有机无机复合体进行氧化实验,利用元素分析及傅里叶红外光谱(FTIR)对实验前后固体样品进行表征.结果表明,有机质中的芳香性物质能够吸附于无机矿物;氧化剂通过不同的作用方式能有效去除有机质中的芳香性有机碳.根据氧化实验结果,两种氧化剂的作用强弱不同即氧化半衰期不同(NaOCl:1.80 d,H2O2:4.80 d),且有机无机复合体中抗氧化性碳的百分比(30%—70%)相对胡敏酸抗氧化性碳比例(NaOCl:16.5%,H2O2:38.2%)高,即相比胡敏酸有更强的固碳能力.In this artMe, humic acid-kaolin complexes were prepared in wet-dry cycles, and were characterized for their properties and stability. H2O2 and NaOC1 were used as oxidants. The characterization results indicated that the aromatic substances in humie acid preferentially adsorbed on inorganic minerals. FTIR analysis showed that both oxidants removed the aromatic components of organic matter effectively. The organic matter have different half lives in two oxidants （ tl/2 = 1.80 d in NaOC1 and tl/2 = 4.80 d in H2O2）. The oxidation-resistant fractions of organio-mineral complexes （30%-70%） were higher than that of bulk humic acid （ NaOC1 ： 16.5%, H2O2 ： 38.2%）. The results suggested that the organic carbon in organo-mineral complexes was in a more favorable form for carbon sequestration than that in humic acid.

关 键 词：有机无机复合体 氧化 碳固定 有机碳库 

分 类 号：X131[环境科学与工程—环境科学]