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Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents.
Langmuir ( IF 3.7 ) Pub Date : 2019-08-17 00:00:00 , DOI: 10.1021/acs.langmuir.9b01863 Richard M Alloway 1 , Jennings Mong 1 , Izaak W Jephson 1 , Mary H Wood 1 , Michael T L Casford 1 , Peter Grice 1 , Sorin V Filip 2 , Ibrahim E Salama 1 , Colm Durkan 3 , Stuart M Clarke 1
Langmuir ( IF 3.7 ) Pub Date : 2019-08-17 00:00:00 , DOI: 10.1021/acs.langmuir.9b01863 Richard M Alloway 1 , Jennings Mong 1 , Izaak W Jephson 1 , Mary H Wood 1 , Michael T L Casford 1 , Peter Grice 1 , Sorin V Filip 2 , Ibrahim E Salama 1 , Colm Durkan 3 , Stuart M Clarke 1
Affiliation
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The adsorption of 4-n-nonylphenol (4NP), carvacrol, and ethanol onto the surface of iron oxide from nonaqueous solutions is presented. It is found that adsorption of 4NP from alkanes is strong and proceeds to monolayer formation, where the molecules are essentially “upright”. However, at high relative concentrations, ethanol successfully out-competes 4NP for the iron oxide surface. Estimates of the enthalpy and entropy of binding of 4NP were found to be exothermic and entropically disfavored. Sum frequency generation vibrational spectroscopy data indicate some evidence of binding through a phenolate anion, despite the nonpolar, nonaqueous solvent. Carvacrol is also found to adsorb as a monolayer where the molecules are lying “flat”. The adsorption of ethanol onto iron oxide from dodecane was investigated through the use of quantitative NMR, which is a convenient analytical technique for measuring adsorption isotherms. It was concluded that ethanol does not form adsorbed monolayers on the surface. Instead, it partitions onto the surface as a surface-enhanced local phase separation related to its poor solubility in alkane solvents.
中文翻译：
非水烃溶剂将4-正壬基苯酚，香芹酚和乙醇吸附到氧化铁上。
4- n的吸附提出了将非壬基酚（4NP），香芹酚和乙醇从非水溶液中转移到氧化铁表面的方法。发现烷烃对4NP的吸附很强，并开始形成单层，其中分子基本上是“直立的”。但是，在较高的相对浓度下，乙醇在氧化铁表面上的竞争能力成功地超过了4NP。发现对4NP结合焓和熵的估计是放热的，并且在熵上是不利的。总和频率产生的振动光谱数据表明，尽管有非极性，非水溶剂，但仍可通过酚酸根阴离子结合。还发现香芹酚以单层形式吸附，分子位于其中。通过使用定量NMR研究了乙醇从十二烷到氧化铁的吸附，这是测量吸附等温线的便捷分析技术。结论是乙醇在表面上不形成吸附的单层。取而代之的是，由于其在烷烃溶剂中的不良溶解性，它作为表面增强的局部相分离而分配到表面上。
更新日期：2019-08-17
中文翻译：
非水烃溶剂将4-正壬基苯酚，香芹酚和乙醇吸附到氧化铁上。
4- n的吸附提出了将非壬基酚（4NP），香芹酚和乙醇从非水溶液中转移到氧化铁表面的方法。发现烷烃对4NP的吸附很强，并开始形成单层，其中分子基本上是“直立的”。但是，在较高的相对浓度下，乙醇在氧化铁表面上的竞争能力成功地超过了4NP。发现对4NP结合焓和熵的估计是放热的，并且在熵上是不利的。总和频率产生的振动光谱数据表明，尽管有非极性，非水溶剂，但仍可通过酚酸根阴离子结合。还发现香芹酚以单层形式吸附，分子位于其中。通过使用定量NMR研究了乙醇从十二烷到氧化铁的吸附，这是测量吸附等温线的便捷分析技术。结论是乙醇在表面上不形成吸附的单层。取而代之的是，由于其在烷烃溶剂中的不良溶解性，它作为表面增强的局部相分离而分配到表面上。
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