与塑料相关的耐多金属芽孢杆菌 EIKU23 的铀和砷生物修复潜力

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials letters Pub Date : 2023-12-29 DOI:10.1016/j.hazl.2023.100101
Atif Aziz Chowdhury , Nilendu Basak , Ekramul Islam
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引用次数: 0

摘要

塑料垃圾会促进微生物的生长,并成为重金属的载体,因此塑料垃圾的积累是一个重大的环境问题。该菌株能耐受各种潜在有毒元素(PTEs),如铬、镍、钴、铜、锌、亚砷酸[As(III)],但对铀(U)和砷酸盐[As(V)]毒性敏感。该菌株可在不同的非生物胁迫条件下生长,最佳 pH 值范围为 5.0-8.0,温度为 30 °C。它显示出了卓越的去除能力,在初始剂量为 100 mg L-1 的水溶液中,它能去除 23.3% 的铀,38% 的 As(III),以及 22.6% 的 As(V)。生物质对铀、砷(III)和砷(V)的生物吸附容量分别为 3.12、3.1 和 1.8 mg g-1。动力学模型表明,U 和 As(V) 的生物吸附遵循伪二阶机制,而 As(III) 的生物吸附遵循伪一阶机制。此外,该菌株还能利用细菌从无机和有机来源释放的磷酸盐分别沉淀出 38.1% 和 67% 的铀。这些发现凸显了该菌株对受 PTE 污染的环境进行生物修复的潜力,为未来研究中优化金属去除和固定过程提供了宝贵的见解。
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Uranium and arsenic bioremediation potential of plastic associated multi-metal tolerant Bacillus sp. EIKU23

Plastic waste accumulation is a significant environmental concern as it promotes microbial growth and acts as a carrier for heavy metals. This study focuses on a Bacillus sp. strain isolated from the surface of a used plastic bottle, tolerant to various potential toxic elements (PTEs) such as chromium, nickel, cobalt, copper, zinc, arsenite [As(III)], but sensitive to uranium (U) and arsenate [As(V)] toxicity. The strain demonstrates growth under different abiotic stress conditions, with the optimal pH range of 5.0–8.0 and a temperature of 30 °C. It shows remarkable removal capabilities, removing > 23.3% of U, > 38% of As(III)), and > 22.6% of As(V) from an initial dose of 100 mg L−1 in an aqueous solution. The biosorption capacity for U, As(III), and As(V) is 3.12, 3.1, and 1.8 mg g−1 of biomass, respectively. Kinetic modelling suggests that the biosorption of U and As(V) follows a pseudo-second-order mechanism, while As(III) biosorption follows a pseudo-first-order mechanism. Moreover, the strain has the ability to precipitate > 38.1% and ∼67% of U using bacterially released phosphate from inorganic and organic sources, respectively. These findings highlight the strain's potential for bioremediation of PTE-contaminated environments, providing valuable insights for optimizing metal removal and immobilization processes in future research.

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来源期刊
Journal of hazardous materials letters
Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering
CiteScore
10.30
自引率
0.00%
发文量
0
审稿时长
20 days
期刊最新文献
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