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首页> 外文会议>International Biohydrometallurgy Symposium >Biosynthesis of Zinc Sulfide Quantum Dots Using Waste Off-Gas from Metal Bioremediation Process
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Biosynthesis of Zinc Sulfide Quantum Dots Using Waste Off-Gas from Metal Bioremediation Process

机译：硫化锌量子点使用废弃物的生物合成来自金属生物化工艺

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Dissimilatory reduction of sulfate, mediated by various species of sulfate-reducing bacteria (SRB), can be used to remediate acid mine drainage (AMD). Hydrogen sulfide (H_2S/HS~-) generated by SRB can be used to remove toxic metals from AMD as sulfide biominerals. For this, SRB are usually housed in separate reactor vessels to those where metal sulfides are generated; H_2S is delivered to AMD-containing vessels in solution or as a gas. This allows more controlled separation of metal precipitation and facilitates enhanced process control. Industries such as optoelectronics use quantum dots (QDs) in, for example, light emitting diodes and solar photovoltaics. QDs are nanocrystals with semiconductor bands that allow them to absorb light and re-emit it intensely at specific wavelength couples. Small nanoparticles have the possibility to get electrons shifted to a higher energy and then emit light during the relaxation phase. The QD elemental composition and the presence of doping agent determines its electronic band gaps and can be used to tune the QD to desired emission wavelengths. Traditional QD production at scale is costly and/or complex. Waste H_2S gas from growth of SRB has been used to make zinc sulfide QDs which are indistinguishable from 'classically' prepared counterparts with respect to their physical and optical properties. Clean recycling of minewater bioremediation process waste gas into high value QD product is described.
机译：通过各种硫酸盐还原细菌（SRB）介导的硫酸盐的硫酸盐的含异化还原可用于修复酸性矿态引流（AMD）。 SRB产生的硫化氢（H_2S / HS〜 - ）可用于从AMD中除去硫化物生物体的毒性金属。为此，SRB通常容纳在不同的反应器容器中，以产生金属硫化物的血管; H_2S在溶液或气体中递送至含AMD的血管。这使得金属沉淀的更受控制的分离并促进增强的过程控制。诸如光电子的行业使用例如发光二极管和太阳能光伏的量子点（QDS）。 QD是具有半导体条带的纳米晶体，其允许它们吸收光并在特定波长耦合到强烈地重新发光。小纳米颗粒具有使电子移位到更高能量的电子，然后在松弛阶段发光。 QD元素组成和掺杂剂的存在确定其电子带间隙，并且可用于将QD调节到所需的发射波长。规模的传统QD生产是昂贵和/或复杂的。废物H_2S来自SRB生长的气体已被用于制造硫化锌QD，这与其物理和光学性质的“经典”的准备对应物无法区分。描述了Minewater BioRemediation工艺废气进入高值QD产品的清洁回收。

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