New insights into the dodecylamine adsorption on scheelite and calcite: An adsorption model
New insights into the dodecylamine adsorption on scheelite and calcite: An adsorption model
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白钨矿和方解石上十二胺吸附的新见解：吸附模型
DOI：
10.1016/j.mineng.2015.05.011
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发表时间：
2015-08
影响因子：
4.8
通讯作者：
Yuehua Hu
中科院分区：
文献类型：
--
作者：
Gao Zhiyong;Wei Sun;Yuehua Hu
通过分子动力学（MD）模拟、zeta电位测量、原子力显微镜（AFM）观察、接触角测量和浮选试验研究了十二烷基胺（DDA）在白钨矿和方解石矿物表面的吸附行为。结果表明，DDA在白石和方解石表面的不同吸附行为主要归因于DDA的阳离子RNH3+。中性物质rnh2的吸附以及两种矿物表面释放的阴离子与RNH3+反应产生的络合沉淀也发挥了重要作用。在DDA溶液（1 × 10−4mol/L, pH 7.5 ~ 8.0）中，少量DDA的rnh2通过- nh2基团的氢与矿物表面氧之间的N-Ca键和氢键吸附在白钨矿和方解石表面。在带正电的方解石表面，RNH3+通过静电吸引和氢键吸附在适量的CO32−位点上，使方解石的zeta电位适度升高。在带负电的白钨矿表面，大量的阳离子RNH3+容易吸附在丰富的WO42−位点上，导致白钨矿的zeta电位显著增加。不同的吸附行为导致DDA物质在白钨矿表面的单层覆盖更大，从而使白钨矿表面具有更强的疏水性和更好的浮选回收率。本工作有助于提出一种新的DDA在白钨矿和方解石上的吸附模型。
In this work, the adsorption behavior of dodecylamine (DDA) on scheelite and calcite mineral surfaces were investigated by molecular dynamics (MD) simulation, zeta potential measurement, AFM observation, contact angle measurement, and flotation test. The results implied that, the different adsorption behavior of DDA on scheelite and calcite surfaces was mainly attributed to cationic species RNH3+of DDA. The adsorption of neutral species RNH2and complex precipitates produced by the reactions between RNH3+and anionic species released by both mineral surfaces, also played important roles. In a DDA solution (1 × 10−4mol/L, pH 7.5–8.0), a handful of RNH2of DDA adsorbed on both scheelite and calcite surfaces through N–Ca bonding and hydrogen bonding between hydrogens of –NH2group and mineral surface oxygens. On positively charged calcite surface, RNH3+adsorbed on a moderate number of CO32−sites through electrostatic attraction and hydrogen bonding, which caused a moderate zeta potential increase for calcite. On negatively charged scheelite surface, a large number of cationic species RNH3+could easily adsorb on abundant WO42−sites, which caused a significant increase of zeta potential for scheelite. The different adsorption behavior led to a heavier monolayer coverage of DDA species on scheelite surface, and thus a more hydrophobic surface and a better flotation recovery of scheelite. The present work helps propose a new adsorption model of DDA on scheelite and calcite.
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DOI：
10.1021/la049796w
发表时间：
2004-04
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
T. G. Cooper;N. D. de Leeuw
通讯作者：
T. G. Cooper;N. D. de Leeuw
影响因子：
4.8
作者：
C. Hiçyilmaz;Ü. Atalay;G. Ozbayoglu
通讯作者：
C. Hiçyilmaz;Ü. Atalay;G. Ozbayoglu
影响因子：
--
作者：
O. Ozcan;A. N. Bulutcu
通讯作者：
O. Ozcan;A. N. Bulutcu
影响因子：
3.9
作者：
Darbha, Gopala Krishna;Schaefer, Thorsten;Fischer, Cornelius
通讯作者：
Fischer, Cornelius
影响因子：
1.5
作者：
Ç. Hoşten
通讯作者：
Ç. Hoşten