共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究

CORC > 北京大学 > 环境科学与工程学院

	共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究; Species Distribution and Coagulation Behavior of Covalent Bonded Aluminum-Silicon Hybrid Flocculants
	彭建雄 ; 赵华章
刊名	环境科学
	2009
关键词	共价键硅铝复合絮凝剂硅烷偶联剂腐殖酸 27AlNMR
英文摘要	利用3种硅烷偶联剂--正硅酸乙酯(TEOS)、二乙氧基二甲基硅烷(DEDMS)、γ-氨丙基二乙氧基甲基硅烷(APDES)分别与氯化铝合成了共价键型硅铝复合絮凝剂,利用27Al NMR研究了其铝形态分布,并试验了其对腐殖酸配水的混凝效果.27Al NMR结果表明,硅源、碱化度(B)、Si/Al摩尔比对铝形态都有影响.以TEOS为硅源的产品中,未检出的铝形态含量较多.而以APDES为硅源的产品中,Al13的含量较高,并随Si/Al摩尔比的增大而增多.碱化度对3种产品中铝形态的影响相似,表现为Al单含量随着B值的增大而降低.当Si/Al摩尔比为0.4时,以TEOS为硅源的产品中一直未出现Al13,以DEDMS为硅源的产品在高B值(1.5)下出现Al13,而以APDES为硅源的产品在低B值(0.5)下即出现Al13.混凝实验结果表明,在酸性条件下,以APDES为硅源的产品的最佳投药范围较宽,处理效果最好.而碱性条件下以TEOS为硅源的产品的处理效果略优于另外2种硅铝复合絮凝剂.; Covalent bonded aluminum-silicon hybrid flocculants were synthesized by employing tetraethylorthosilicate (TEOS) and two silane coupling agents [diethoxydimethylsilane (DEDMS), gamma-aminopropylmethyldiethoxysilane (APDES)] as silicon sources, respectively. The distribution of Al species was investigated by 27Al NMR method and the coagulation behavior was evaluated by treating synthetic water containing humic acid. The results of 27Al NMR show that silicon source, Si/Al molar ratio and basicity (B) exhibit effect on the Al species distribution. In the products with APDES as silicon source, the highest content of Al13 was obtained and its amount increases with the rise of Si/Al molar ratio. The effect of B value on the Al species is similar for the three sets of flocculants. The content of monomeric species decreases with the rise of B value. At Si/Al = 0.4, there are no Al13 observed throughout the B value range in the products with TEOS as silicon source. Al13 starts to appear at a higher B value of 1.5 for the products with DEDMS as silicon source and a lower B value of 0.5 for that with APDES as silicon source, respectively. The coagulation results show that, in acidic conditions, the best dosage range of the flocculants with APDES as silicon source is the widest of the three, resulting in the best coagulation efficiency. In alkaline conditions, the coagulation efficiency of the products with TEOS as silicon source is slightly better than the other two.; 国家自然科学基金; PubMed; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; 6; 1705-1710; 30
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/158932]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	彭建雄,赵华章. 共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究, Species Distribution and Coagulation Behavior of Covalent Bonded Aluminum-Silicon Hybrid Flocculants[J]. 环境科学,2009.
APA	彭建雄,&赵华章.(2009).共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究.环境科学.
MLA	彭建雄,et al."共价键型硅铝复合絮凝剂的铝形态分布及其絮凝性能研究".环境科学 (2009).