生氰微生物对氰化物生物生产的热演化和能量分析，具有生物浸出贵金属的潜力。,Journal of Hazardous Materials

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生氰微生物对氰化物生物生产的热演化和能量分析，具有生物浸出贵金属的潜力。
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2019-05-22 , DOI: 10.1016/j.jhazmat.2019.05.051
Zhihui Yuan ₁ , Yongqiang Yuan ₁ , Weiqi Liu ₁ , Jujun Ruan ₁ , Yaying Li ₁ , Yaxin Fan ₁ , Rongliang Qiu ₁

Affiliation

在目前的回收废印刷电路板（WPCB）的技术中，贵金属损失了。微生物产生的氰化物被认为是从WPCB生物浸出贵金属的重要浸滤剂。提高氰化物产量是生物浸出技术产业化的关键。本研究确定了生物氰化物的前体形式，研究了氰化物合成的能量特征，氰化物培养物的热变化特征以及氰化物产量与热变化之间的潜在动力学关系。我们首先发现甘氨酸阴离子[H2NCH2CO2]-是微生物生物催化中氰化物的前体形式。通过计算化学分析了从甘氨酸阴离子到氰化物的键裂解途径。结果表明甘氨酸阴离子分解为氰化物是吸热的且非自发的。[HN = CHCO2]-和-C≡N的形成分别具有34.05和9.15 kcal / mol的平均能垒，而由阴离子中间体形成的自由基的平均能垒为71.05 kcal / mol。当热量产生最强时，氰化物浓度开始从0.48增加到5.27 mg / L。无菌培养基和生氰培养物之间的温差达到0.3°C。因此，代谢热对氰化物的生物合成产生了积极的影响。当热量产生最强时为27 mg / L。无菌培养基和生氰培养物之间的温差达到0.3°C。因此，代谢热对氰化物的生物合成产生了积极的影响。当热量产生最强时为27 mg / L。无菌培养基和生氰培养物之间的温差达到0.3°C。因此，代谢热对氰化物的生物合成产生了积极的影响。

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Heat evolution and energy analysis of cyanide bioproduction by a cyanogenic microorganism with the potential for bioleaching of precious metals.

Precious metals were lost in the current technologies of recovering waste printed circuit boards (WPCBs). Microbe-produced cyanide is considered as an important lixiviant in bioleaching of precious metals from WPCBs. Enhancing cyanide production is the key to industrialization of bioleaching technology. This study identified the precursor form of biogenic cyanide, investigated the energy characteristics of cyanide synthesis, thermal change characteristics of cyanogenic culture, and the potential kinetic relationship between cyanide production and thermal change. We firstly found glycine anion [H2NCH2CO2]- was the precursor form of cyanide in microbial biocatalysis. The bond cleavage pathways from glycine anion to cyanide were analyzed by computation chemical. Results showed decomposition of glycine anion into cyanide was endothermic and non-spontaneous. Formations of [HN = CHCO2]- and -C≡N have an average energy barrier of 34.05 and 9.15 kcal/mol respectively, while formations of free radicals from anionic intermediates have an average barrier of 71.05 kcal/mol. Cyanide concentration began to increase from 0.48 to 5.27 mg/L when heat production was strongest. Temperature difference between sterile medium and cyanogenic culture reached 0.3 °C. Therefore, metabolic heat brought positive effect on cyanide biosynthesis.

更新日期：2019-05-23

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