Chromium (VI) is known to be harmful element that commonly found industrial waste, mining activities, and wastewater discharges from various industries. When released into the environment, Cr (VI) can contaminate soil, water, and air, posing a serious threat to living organisms. Aiming to Cr decontamination, this work was framed to isolate the fungal species having high Cr tolerance capacity and to exploit as bio-sorbent for the removal of Cr (VI) from aqueous solutions by biosorption. Among the fungal species isolated from the Cr (VI) contaminated soil sample, the filamentous fungus of Ophiocordycipitaceae family, Purpureocillium lilacinum was identified using molecular sequencing technique, showed maximum tolerance against Cr (VI) with a tolerance index of 1.19 ± 0.23. Further, Plackett Burman Design was applied to investigate for ascertaining the significance of different carbon and nitrogen sources on P. lilacinus growth, as well as the influence of environmental factors, such as pH, temperature, and Cr (VI) concentration. The results explicated that glucose was the most preferred carbon source for P. lilacinus, while yeast extract was the most preferred for nitrogen source. The optimum pH value and temperature were found to be 6.0 and 26 °C, respectively. In addition, P. lilacinus isolate was identified to survive in high concentrations of Cr (VI), indicating its potential for employing effective bioremediation of chromium-contaminated site.

中文翻译：

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紫紫紫霉生物质去除铬 (VI) 的生物吸附潜力：生长限制因素的分离、表征和意义

铬 (VI) 是已知的有害元素，常见于工业废物、采矿活动和各行业废水排放中。当释放到环境中时，六价铬会污染土壤、水和空气，对生物体造成严重威胁。以 Cr 净化为目标，本工作旨在分离具有高 Cr 耐受能力的真菌物种，并利用其作为生物吸附剂，通过生物吸附从水溶液中去除 Cr (VI)。从Cr(VI)污染土壤样品中分离出的真菌种类中，利用分子测序技术鉴定出蛇虫草科丝状真菌紫紫紫菌(Purpureocilium lilacinum)，其对Cr(VI)具有最大耐受性，耐受指数为1.19±0.23。此外，应用 Plackett Burman Design 来研究不同碳源和氮源对紫紫青霉生长的影响，以及 pH、温度和 Cr (VI) 浓度等环境因素的影响。结果表明，葡萄糖是淡紫假单胞菌最优选的碳源，而酵母提取物是最优选的氮源。最佳pH值和温度分别为6.0和26℃。此外，P. lilacinus 分离株被发现能够在高浓度 Cr (VI) 中存活，表明其具有对铬污染场地进行有效生物修复的潜力。