当前位置: X-MOL 学术Energy Fuels › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Impact of Modified Seawater on Zeta Potential and Morphology of Calcite and Dolomite Aged with Stearic Acid
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-01-30 00:00:00 , DOI: 10.1021/acs.energyfuels.7b03753
Hasan Al-Hashim 1 , Ahmed Kasha 1 , Wael Abdallah 2 , Bastian Sauerer 2
Affiliation  

Zeta potential measurements and microscopic surface characterization and imaging were conducted on calcite and dolomite crystals aged in stearic acid model oil and exposed to different synthetic brines representing different potential scenarios of injected seawater from the Arabian Gulf. Calcite particles were negatively charged in deionized water and maintained negative surface charges in all tested brines, except in diluted Arabian Gulf seawater that contained higher concentration of Ca2+ and Mg2+ ions. Dolomite particles were positively charged in deionized water as well as in all tested brines, except in diluted Arabian Gulf seawater that contained four times higher concentration of SO42– ions. Scanning electron microscopy and atomic force microscopy experiments on cleaved calcite and dolomite chips showed different morphological changes when both samples were aged in model oil and then treated with brines. Calcite surface dissolution was observed in addition to stearic acid deposition. Surface elemental analysis using energy-dispersive spectroscopy showed Mg2+ and SO42– ions adsorb preferably on locations where stearic acid is deposited. The finding that stearic acid was adsorbing more strongly on dolomite than on calcite could indicate why the tested brines were less efficient to change the zeta potential of the dolomite systems. The current study concludes that manipulating the concentration of potential-determining ions present in the Arabian Gulf seawater, especially Mg2+ and SO42– ions, will alter the surface charges of aged calcite and dolomite samples as well as their surface morphology.

中文翻译:

改性海水对硬脂酸老化的方解石和白云岩的ζ电势和形貌的影响

在硬脂酸模型油中老化的方解石和白云石晶体上进行了Zeta电位测量以及微观表面表征和成像,并暴露于代表来自阿拉伯湾的注入海水的不同潜在方案的不同合成盐水中。方解石颗粒在去离子水中带负电,并在所有测试盐水中保持负表面电荷,但稀释的阿拉伯海湾海水中Ca 2+和Mg 2+离子的浓度较高。白云石颗粒在去离子水和所有测试盐水中带正电,但稀释的阿拉伯湾海水中SO 4 2浓度高四倍,离子。当两个样品均在模型油中陈化然后用盐水处理时,对裂解的方解石和白云石碎片的扫描电子显微镜和原子力显微镜实验显示出不同的形态变化。除硬脂酸沉积外,还观察到方解石表面溶解。使用能量色散光谱的表面元素分析显示Mg 2+和SO 4 2–离子优选吸附在硬脂酸沉积的位置上。发现硬脂酸在白云石上的吸附比方解石上的吸附强,这可能表明为什么测试的盐水改变白云石体系的ζ电势效率较低。当前的研究得出的结论是,控制阿拉伯海湾海水中存在的电位确定离子的浓度,特别是Mg 2+和SO 4 2–离子,将改变老化的方解石和白云石样品的表面电荷以及它们的表面形态。
更新日期:2018-01-30
down
wechat
bug