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Photosensitization of electro-active microbes for solar assisted carbon dioxide transformation
Bioresource Technology ( IF 11.4 ) Pub Date : 2018-10-12 , DOI: 10.1016/j.biortech.2018.10.031
Manoj Kumar , Prakash C. Sahoo , Sandipam Srikanth , Reshmi Bagai , S.K. Puri , S.S.V. Ramakumar

Tandem bio-inorganic platform by combining efficient light harvesting properties of nano-inorganic semiconductor cadmium sulfide (CdS) with biocatalytic ability of electro-active bacteria (EAB) towards carbon dioxide (CO2) conversion is reported. Sulfur was obtained from either cysteine (EAB-Cys-CdS) or hydrogen sulfide (EAB-H2S-CdS) and experiments were carried out under similar conditions. Anchoring of the nano CdS cluster on the microbe surface was confirmed using electronic microscope. Bio-inorganic hybrid system was able to produce single and multi-carbon compounds from CO2 in visible spectrum (λ > 400 nm). Though, acetic acid was dominant (EAB-Cys-CdS, 1.46 g/l and EAB-H2S-CdS, 1.55 g/l) in both the microbe-CdS hybrids, its concentration as well as product slate varied significantly. EAB-H2S-CdS produced hexanoic acid and less methanol fraction, while the EAB-Cys-CdS produced no hexanoic acid along with almost double the concentration of methanol. Due to easy harvesting process, this bio-inorganic hybrid represents unique sustainable approach for solar-to-chemical production via CO2 transformation.



中文翻译:

用于太阳能辅助二氧化碳转化的电活性微生物的光敏作用

报道了通过结合纳米无机半导体硫化镉(CdS)的有效光收集特性和电活性细菌(EAB)对二氧化碳(CO 2)转化的生物催化能力的串联生物-无机平台。从半胱氨酸(EAB-Cys-CdS)或硫化氢(EAB-H 2 S-CdS)中获得硫,并在相似的条件下进行了实验。使用电子显微镜确认了纳米CdS簇在微生物表面上的锚定。生物-​​无机混合系统能够在可见光谱(λ> 400 nm)中由CO 2生产单碳和多碳化合物。尽管乙酸是主要成分(EAB-Cys-CdS,1.46 g / l和EAB-H 2在两种微生物-CdS杂种中,其S-CdS含量为1.55 g / l,其浓度以及产物种类均发生显着变化。EAB-H 2 S-CdS产生的己酸和较少的甲醇馏分,而EAB-Cys-CdS的则没有产生己酸,而甲醇的浓度几乎增加了一倍。由于易于收获,这种生物-无机杂种代表了通过CO 2转化进行太阳能生产的独特的可持续方法。

更新日期:2018-10-12
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