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首页> 外文会议>Corrosion and surface engineering >Adsorption Kinetics of Benzothiazole and 2-Mercaptobenzothiazole on Microcrystalline Gold and Silver Surfaces
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Adsorption Kinetics of Benzothiazole and 2-Mercaptobenzothiazole on Microcrystalline Gold and Silver Surfaces

机译：苯并噻唑和2-巯基苯并噻唑在微晶金和银表面的吸附动力学

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摘要

Adsorption kinetics of benzothiazole (BNS) and 2-mercaptobenzothiazole (2-MBT), concentration range 1×10~(-1) M - 1×10~(-3) M, were studied during 5000 s on gold and silver coated At-cut quartz microelectrodes, using EQCM. The frequency changes for 2-MBT fited well to the Langmuir isotherm, while BNS presents adsorption-desorption periods making the fitting non realiable. The calculated ΔG_(ads) energies of 2-MBT on Ag (-1.38 kcal mol~(-1)) and Au (-1.94 kcal mol~(-1)) correspond to physisorption process. The adsorbed masses of 2-MBT (1×10~(-3) M) on Au and Ag were significantly higher (20.76 μg cm~(-2) and 6.03 μg cm~(-2), respectively) than those of BNS on the same metals (0.33 μg cm~(-2) and 0.88 μg cm~(-2)). These differences were attributed to the possible deprotonation process of 2-MBT, giving place to an ionized form (anion) and its interaction with positively charged surfaces of Au and Ag. However, BNS protonates giving place to a cation and making more difficult its adsorption on both metals.
机译：在5000 s内研究了浓度为1×10〜（-1）M-1×10〜（-3）M的苯并噻唑（BNS）和2-巯基苯并噻唑（2-MBT）在金和银上的吸附动力学。切割石英微电极，使用EQCM。 2-MBT的频率变化与Langmuir等温线非常吻合，而BNS的吸附-解吸周期使拟合无法实现。计算得出的2-MBT在Ag（-1.38kcal mol〜（-1））和Au（-1.94kcal mol〜（-1））上的ΔG_（ads）能量对应于物理吸附过程。 2-MBT（1×10〜（-3）M）在金和银上的吸附质量明显高于BNS（分别为20.76μgcm〜（-2）和6.03μgcm〜（-2））。在相同的金属上（0.33μgcm〜（-2）和0.88μgcm〜（-2））。这些差异归因于2-MBT可能的去质子过程，从而产生了离子化形式（阴离子）及其与Au和Ag带正电表面的相互作用。但是，BNS质子化会取代阳离子，并使它在两种金属上的吸附更加困难。

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