Zhang Na, Li Jiajia, Kou Jue, Sun Chunbao
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Molecules. 2023 Oct 6;28(19):6945. doi: 10.3390/molecules28196945.
Hydrogen bonds play an important role in the interaction between surfactants. In this study, the effect of three different ethoxylated alcohols (OP-10, NP-10, AEO-9) on the collecting behavior of sodium oleate (NaOL) in the flotation of quartz was investigated. To explore the mechanism, the hydrogen bond between ethoxylated alcohols and NaOL was analyzed using molecular dynamics (MD) simulation. The results showed that ethoxylated alcohols promoted the collecting performance of NaOL and reduced the dosage of the activator CaO and the collector NaOL in the flotation of quartz. The Zeta potential measurement illustrated that ethoxylated alcohols promoted the adsorption of OL on the activated quartz surface and the degree of promotion was in the order of OP-10 > NP-10 > AEO-9. The MD simulation results showed that a hydrogen bond presented between ethoxylated alcohols and OL. Due to the hydrogen bond between the ethoxylated alcohols and OL, the attraction force between OL and the quartz surface increased with the addition of ethoxylated alcohols in the order of OP-10 > NP-10 > AEO-9 based on the MD simulation results. As the result, the addition of ethoxylated alcohols increased the adsorption density of OL on the activated quartz surface, which explained the promotion of the collecting performance of OL in the flotation of quartz.
氢键在表面活性剂之间的相互作用中起着重要作用。在本研究中，研究了三种不同的乙氧基化醇（OP - 10、NP - 10、AEO - 9）对油酸钠（NaOL）在石英浮选中捕收行为的影响。为了探究其作用机理，采用分子动力学（MD）模拟分析了乙氧基化醇与NaOL之间的氢键。结果表明，乙氧基化醇促进了NaOL的捕收性能，并降低了石英浮选中活化剂CaO和捕收剂NaOL的用量。Zeta电位测量表明，乙氧基化醇促进了OL在活化石英表面的吸附，促进程度为OP - 10 > NP - 10 > AEO - 9。MD模拟结果表明，乙氧基化醇与OL之间存在氢键。基于MD模拟结果，由于乙氧基化醇与OL之间的氢键，随着乙氧基化醇的加入，OL与石英表面之间的吸引力按OP - 10 > NP - 10 > AEO - 9的顺序增加。结果，乙氧基化醇的加入增加了OL在活化石英表面的吸附密度，这解释了在石英浮选中OL捕收性能的提高。
