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Response of mixed bacterial culture towards dibenzothiophene desulfurization under the influence of surfactants and microscopically (SEM and TEM) characterized magnetic Fe3O4 nanoparticles
Microscopy Research and Technique ( IF 2.5 ) Pub Date : 2022-09-16 , DOI: 10.1002/jemt.24230
Javed Khan 1 , Muhammad Ishtiaq Ali 1 , Asif Jamal 1 , Mushtaq Ahmad 2, 3 , Jahangir Khan Achakzai 4 , Muhammad Zafar 2
Affiliation  

Excessive emission of sulfur dioxides from the combustion of coal and other fossil fuels for thermal and industrial purposes has been associated with serious environmental hazards. Biodesulfisation (BDS) can be an effective approach for reducing the impact of toxic gases to its inbuilt operational feasibility under ambient environmental conditions. In the present research, two strategies for BDS of a standard organosulfur compound such as dibenzothiophene (DBT) were investigated under laboratory conditions. In the first treatment, the role of different surfactants such as Tween-20, Tween-80, SDS, and EDTA on the desulfurization of DBT was investigated by the application of bacterial consortium IQMJ-5. In the second treatment, Iron oxidenanoparticles were synthesized and immobilized on the surface of bacteria cells. Shake flask experiments were conducted with immobilized cells, surfactant amended immobilized cells, and control or noncoated cells. Among different surfactant treatments, Tween-80 was found to be the most effective surfactant, showing maximum desulfurization activity at a concentration of 5 g/L. The transmission electron microscopy and X-ray diffraction analysis indicated that produced nanoparticles were spherical in shape with a size of about 46 nm and had a stoichiometric ratio of 55.85% and 44.15% between O and Fe, respectively. The nanoparticle treatment enhanced the DBT desulfurization process up to 11.37% as compared to the control, specifically when immobilized cells were used. Therefore, it was concluded that nanoparticles treatments with immobilization of the bacterial cells enhanced the desulfurization rate of DBT under ambient reaction conditions and provide a sustainable alternative for commercial coal BDS.

中文翻译:

在表面活性剂和显微(SEM 和 TEM)表征磁性 Fe3O4 纳米颗粒的影响下,混合细菌培养物对二苯并噻吩脱硫的响应

用于热能和工业用途的煤和其他化石燃料的过度排放二氧化硫与严重的环境危害有关。生物脱硫 (BDS) 是一种有效的方法,可在周围环境条件下减少有毒气体对其内置操作可行性的影响。在本研究中,在实验室条件下研究了标准有机硫化合物(例如二苯并噻吩 (DBT))的 BDS 的两种策略。在第一次处理中,通过应用菌群 IQMJ-5 研究了 Tween-20、Tween-80、SDS 和 EDTA 等不同表面活性剂对 DBT 脱硫的作用。在第二次处理中,氧化铁纳米颗粒被合成并固定在细菌细胞表面。用固定化细胞、表面活性剂修饰的固定化细胞和对照或未包被的细胞进行摇瓶实验。在不同的表面活性剂处理中,Tween-80 被发现是最有效的表面活性剂,在浓度为 5 g/L 时表现出最大的脱硫活性。透射电子显微镜和 X 射线衍射分析表明,制备的纳米粒子呈球形,尺寸约为 46 nm,O 和 Fe 的化学计量比分别为 55.85% 和 44.15%。与对照相比,纳米颗粒处理将 DBT 脱硫过程提高了 11.37%,特别是在使用固定化细胞时。所以,
更新日期:2022-09-16
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