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UID:20250807T134750EDT-837567Uuou@132.216.98.100
DTSTAMP:20250807T174750Z
DESCRIPTION:The advancement of next generation catalysts that operate at lo
 wer temperatures\, in ambient\n	conditions and that utilize renewable energ
 y sources such as sunlight is of paramount importance to\n	our society sinc
 e the chemical industry\, which depends on catalysts for most reactions\, 
 is a large energy\n	consumer in many countries (for example\, the chemical 
 industry consumes ~7% of the energy\n	produced in the US). Heterogeneous ph
 otocatalysts benefit from good photo-stability\, and high\n	absorption coef
 ficients at the band-edge\, and they are often made from relatively cheap 
 materials that\n	are easy to synthesize into the desired crystal structure 
 and surface chemistry. Quantum dots (QDs)\n	have the potential to combine t
 hese benefits of heterogeneous catalysts with the solution dispersability
 \n	of homogeneous catalysts. This paper describes the visible-light photoca
 talysis of the proton-coupled\n	six-electron reduction of nitrobenzene to a
 niline at room temperature within dispersions of CdS\n	quantum dots (QDs) i
 n 80:20 water:methanol. The QDs act as direct photocatalysts – there is no
 \n	intervening molecular catalyst present. Over 54 hours of illumination wi
 th visible light at pH 2.6\, each\n	QD transfers 4.5x106 electrons which re
 duces 8.3x105 nitrobenzene molecules to aniline and the other\n	isolable in
 termediate\, phenylhydroxylamine. 3-mercaptopropionic acid serves as (i) a
  solubilizing ligand\n	for the QDs\, (ii) the terminal reductant that regen
 erates the QD catalyst and (iii) the proton donor in\n	each reduction step.
  If left unprotonated\, aniline adsorbs to the QD surface and limits the r
 eaction rate\n	and yield by inhibiting electron transfer to nitrobenzene. T
 he activity (electrons transferred x g catalyst-\n	1 x J photons-1) of the 
 high-surface-area QDs used in this study is a factor of 2.5x104 greater th
 an that\n	previous reported for CdS micropowder.\n
DTSTART:20150811T170000Z
DTEND:20150811T181500Z
LOCATION:room 1B45\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue
  Sherbrooke Ouest
SUMMARY:ɬÀï·¬ Chemistry Students Invited Lecture: Emily A. Weiss - Visible
 -Light Photocatalysis within Dispersions of Colloidal Quantum Dots
URL:/chemistry/channels/event/mcgill-chemistry-student
 s-invited-lecture-emily-weiss-visible-light-photocatalysis-within-253419
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