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Admicelle-air bubble flotation system for rapid and efficient removal of environmental pollutants from waste water

Admicelle-气泡气浮系统可快速有效地去除废水中的环境污染物

基本信息

批准号：
12558071
负责人：
HIRAIDE Masataka
金额：
$ 6.78万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

A microscopic solvent property of surfactant aggregates dynamically sorbed on alumina surfaces (i.e., admicelles) was evaluated by the fluorometric method. From the relationship of emission wavelength and polarity of the selected solvent, sodium dodecylsulfate/alumina admicelles have the hydrophobicity larger than normal micelles. It corresponded to 1-octanol or ethylacetate. Many environmental pollutants including chlorophenols, alkylphenols, polyaromatic hydrocarbons, alkylated tin, formaldehyde, and pesticides were rapidly and effectively collected in the admicelles. The extent of the incorporation was correlated with the aqueous-octanol distribution coefficient, which represents the hydrophobicity of the compound. Highly hydrophobic, hence bio-accumulative compounds were efficiently incorporated and highly concentrated into the admicellar media. The incorporation was quite rapid and efficient because of higher wettability and permeability. Admicelles are also useful for the treatment of large volume samples. Alumina having positive zeta potential became negatively charged particles, when they sorbed anionic surfactant SDS molecules. In the moderate SDS sorption, the alumina particles were quantitatively floated on the solution surface by bubbling. This indicates the possibility of simple and rapid recovery of admicelles. Flotation was achieved within 15 s and the particles were retained on the water surface for several minutes. The proposed admicelle-air bubble flotation system has the high potential, in which different hydrophobic toxic compounds are successfully collected in admicelles and then rapidly separated from the bulk solutions by flotation.

动态吸附在氧化铝表面上的表面活性剂聚集体的微观溶剂性质（即，admicelles）通过荧光测定法进行评价。从发射波长与所选溶剂极性的关系来看，十二烷基硫酸钠/氧化铝吸附胶束具有比普通胶束更大的疏水性。其对应于1-辛醇或乙酸乙酯。许多环境污染物，包括氯酚，烷基酚，多环芳烃，烷基化锡，甲醛和农药被迅速和有效地收集在该胶束。掺入的程度与水-辛醇分配系数相关，其代表化合物的疏水性。高度疏水，因此生物累积的化合物被有效地纳入和高度浓缩到admicellar介质。由于较高的润湿性和渗透性，掺入是相当快速和有效的。亚胶束也可用于处理大体积样品。具有正zeta电位的氧化铝吸附阴离子表面活性剂SDS分子后，变成带负电荷的颗粒。在中等SDS吸附中，氧化铝颗粒通过鼓泡定量漂浮在溶液表面。这表明了简单而快速地回收吸附胶束的可能性。在15秒内实现浮选，并将颗粒保留在水面上数分钟。所提出的亚胶束-气泡浮选系统具有很高的潜力，其中不同的疏水性有毒化合物被成功地收集在亚胶束中，然后通过浮选从本体溶液中快速分离。