Electrostatic assembly of gold nanorods on a glass substrate for sustainable photocatalytic reduction via sodium borohydride
RSC ADVANCES(2016)
摘要
Herein we adhere gold nanorods (Au NRs) to glass coverslips through electrostatic interactions by treating the glass coverslips with (3-aminopropyl) trimethoxysilane (APTMS) and polystyrene sulfonate (PSS). These Au NR-functionalized coverslips were used to demonstrate the sustainable, catalytic reduction of 4-nitroaniline by sodium borohydride. Au NRs in solution were compared to the Au NR coverslips and were found to have pseudo-first-order observed rate constants of 1.35 x 10(-2) min(-1) (2.79 x 10(6) min(-1) per Au) and 4.12 x 10(-2) min(-1) (4.26 x 10(5) min(-1) per Au), respectively. The same catalytic reaction was executed under photolysis (1000 W Xe lamp); free NRs and Au NR-functionalized coverslips demonstrate pseudo-first-order observed rate constants of 2.15 x 10(-2) min(-1) (4.44 x 10(6) min(-1) per Au) and 6.28 x 10(-2) min(-1) (6.48 x 105 min(-1) per Au), respectively, which are two orders of magnitude faster than the only other affixed catalyst, Au NP in polymer. In addition to being scalable in Au-NR layers, a representative Au NR-functionalized coverslip was re-used for three consecutive catalysis reactions before decrease in rate, and had a rate similar to 65% of the original reaction after the fifth cycle. Thus, we have demonstrated an efficient and reusable, thermal and photochemical gold nanorod catalyst assembly that does not require a complex synthetic protocol or the use of specialized equipment.
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关键词
gold nanorods,sustainable photocatalytic reduction,photocatalytic reduction,electrostatic assembly,glass substrate
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