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叔胺 1

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十二系列叔胺捕收剂对高岭石的浮选研究

曹学锋,刘长淼,胡岳华

《中国工程科学》 2011年第13卷第1期页码 93-97

摘要：

研究4种十二取代叔胺（DRN，DEN，DPN和DBN）对高岭石的浮选行为。发现4种叔胺对高岭石的浮选捕收能力都较好，其中DEN最好，浮选回收率最高可达92 %以上。4种叔胺主要依靠静电引力吸附在高岭石表面，在酸性pH范围内，浮选高岭石的回收率较高，随着pH的增大，叔胺的阳离子组分减少，使得浮选回收率下降。Zeta电位研究表明，高岭石在整个pH范围内，表面主要带负电，4种叔胺与高岭石作用后，能显著增加高岭石的Zeta电位。红外光谱研究表面，4种叔胺主要与高岭石表面发生了电性作用的物理吸附。叔胺中N原子上的取代基的给电子效应和空间位阻效应是造成 4 种叔胺浮选能力差异的主要原因。

关键词：叔胺高岭石浮选静电作用电子效应空间效应

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Removal of sulfadiazine from aqueous solution on kaolinite

Jian XU, Yan HE, Yuan ZHANG, Changsheng GUO, Lei LI, Yuqiu WANG

《环境科学与工程前沿（英文）》 2013年第7卷第6期页码 836-843 doi: 10.1007/s11783-013-0513-4

摘要： The adsorption of sulfadiazine onto kaolinite clay as an alternative adsorbent was examined in aqueous solution. Impacts of the contact time, pH, temperature, ionic strength and coexistent surfactants on the adsorption process were evaluated. The pH significantly influenced the adsorption process, with adsorption being promoted at lower pH due to the cation exchange mechanism. Decreasing ionic strength in the solution was favorable for adsorption, and the addition of cationic and anionic surfactants had negative effects on the adsorption capacity of sulfadiazine on kaolinite. Kinetic experiments showed that the adsorption followed the pseudo-second-order model. The equilibrium adsorption was well described by both Freundlich and Dubinin-Radushkevich (DR) models. According to the DR model, the adsorption mechanism was determined by cationic exchange and weak physical forces. The thermodynamic study showed that sulfadiazine adsorption onto kaolinite was a spontaneous and endothermic reaction.

关键词： adsorption kaolinite sulfadiazine kinetics