BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
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2020
·Vol. 25
·期 4
·589-598
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IF 2.213
He Jinjia,Chen Yi,Dai Luyao,Yao Jiachao,Mei Yu,Hrynsphan Dzmitry,Tatsiana Savitskaya,Chen Jun
Acrylic acid is used in various industrial applications but inflicts harm to human health and causes environmental pollution. A new bacterium, identified as Rhodococcus ruber JJ-3, was isolated, which can degrade high concentrations of acrylic acid rapidly and completely. Experimental results showed that the strain can achieve complete degradation of 1000 mg·L −1 acrylic acid in 11 h under the following conditions: pH 7, temperature 35°C, and inoculation quantity 15%. A high concentration of acrylic acid (2000 mg·L −1 ) can be completely removed in 28 h. According to the Monod model, the maximum specific degradation rate ( v max ) and half saturation rate constant ( K S ) of the strain were 0.85 h −1 and 101.83 mg·L −1 , respectively. The results of carbon balance revealed that 54.6% carbon was assimilated by R. ruber JJ-3 as biomass, and 43.0% carbon was mineralized into CO 2 . Furthermore, glycerol and lactic acid were measured as intermediates, and the possible degradation pathway was proposed during the biodegradation of acrylic acid. These results suggested that R. ruber JJ-3 completely degrades acrylic acid and might have a potential environmental implication in the purification of acrylic acid-contaminated environments.
研究领域:
微生物学
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环境科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2018
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IF 3.562
Juping You,Mine Du,Han Chen,Xinying Zhang,Shihan Zhang,Jianmeng Chen,Zhuowei Cheng,Dongzhi Chen,Jiexu Ye
A new isolate identified as Rhodococcus sp. ZJUT312 via taxonomic and 16S rRNA analysis was used for the efficient degradation of benzene, toluene, ethylbenzene, and xylene (BTEX). The strain ZJUT312 was able to degrade all the BTEX. Their average biodegradation rates followed the order o -xylene > ethylbenzene > toluene > benzene > m -xylene > p -xylene. The degradation rate of o -xylene reached as high as 0.117 mmol L −1 h −1 , which was one to two orders of magnitude higher than that of all other reported o -xylene degrading bacteria. GC-MS analysis revealed that o -xylene degradation pathway mainly proceeded with 2-methylbenzylalcohol as an intermediate and CO 2 as a final product. Mass balance analysis of the carbon element indicated that approximately 59% the o -xylene carbons were transferred to cell biomass and about 20% were mineralized into CO 2 . Furthermore, the o -xylene degradation kinetics fitted well with Haldane's model. The maximum specific degradation rate (0.953 h −1 ) was approximately 2.25 times higher than the reported data in the literature.
研究领域:
环境生物学
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微生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xi Tang,Bin Xu,Wufeng Jiang,Xiaoshan Li,Ge Gao,Fan Wu,Cong Luo,Liqi Zhang
Piperazine (PZ) derivatives which have been widely used in CO 2 capture technology exhibit stable physicochemical properties, such as resistance to thermal degradation and low regeneration energy consumption. Both two parameters of CO 2 absorbents, low CO 2 absorption heat (ΔH abs ) and large CO 2 equilibrium solubility (α e ), are important to CO 2 capture performance. However, the influence of functional group types of PZ derivatives on their CO 2 capture performance remained unclear. This research aimed to study the functional group influence on the ΔH abs and α e by PZ derivatives with two amines using experimental and quantum chemical methods. The results indicated that PZ derivatives with the ethyl side chain had larger ΔH abs and α e than those with the methyl side chain. The presence of the hydroxy group in PZ derivatives reduced the ΔH abs and the α e . The presence of cyclic methyl side chains on the N atom of PZ derivatives decreased the ΔH abs and increased α e at the same time. The findings show that PZ derivatives with cyclic methyl side chains, steric hindrance effect, and no hydroxy group are favorable for CO 2 capture. Among the eight PZ derivatives, TEDA with lower ΔH abs (48.99 kJ/mol) and higher α e (0.917 mol CO 2 /mol amine) is an excellent absorbent. The results of this study are very important for screening efficient and low-energy consumption absorbents for CO 2 capture.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Liu Shengqin,Jin Yangxin,Huang Shuquan,Zhu Qi,Shao Shan,Lam Jason Chun-Ho
The catalytic valorisation of biomass to afford synthetically useful small molecules is essential for sustainable biorefinery processes. Herein, we present a mild cascaded electrochemical protocol for converting furoic acid, a common biomass-derived feedstock, into a versatile platform chemical, gamma-butyrolactone. In the platinum(+)|nickel(−) electrode paired undivided cell, furoic acid is electrochemically oxidised with 84.2% selectivity to 2(5 H )-furanone, the olefin of which is then hydrogenated to yield gamma-butyrolactone with 98.5% selectivity. The final gamma-butyrolactone yield is 69.1% with 38.3% Faradaic efficiency and 80.1% carbon balance when the reaction is performed with 100 mM furoic acid at 80 °C at +2.0 V Ag/AgCl . Mechanistic investigation revealed the critical temperature and electrolyte pH conditions that maximise the production and protection of the key intermediate, furan radical, promoting its transition to 2(5 H )-furanone rather than self-polymerising. The reaction is scalable, as 2.1 g of 98.1% pure gamma-butyrolactone is isolated through a simple solvent extraction.
研究领域:
化学工程
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电化学
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可持续化学
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生物质转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Shuangde Li,Tao Wang,Mu Zhou,Shaohua Chai,Linfeng Nie,Zhenjiang Wu,Ning Han,Yunfa Chen
A dual-functional adsorption–catalytic system for elimination of trace toluene is developed and realized over molecular sieve-hosted varied ratio of platinum and palladium catalysts. PtPd/molecular sieve exhibites PdO and PtO 2 around 2–3 nm particles with uniform loading verified by XRD, TEM, Raman and XPS. The adsorption–desorption–catalysis for trace toluene purification is evaluated on the quartz micro-reactor and the self-made electrically heated equipment. 3Pt1Pd/molecular sieve shows toluene adsorption capacity of 18.22 mg/g and desorption efficiency about 77%, together with the maximum desorption temperature at 100 °C. 3Pt1Pd/molecular sieve owns toluene conversion with 38.3% and 100% at 100 and 200 °C, accompanied with the higher CO 2 selectivity of 0.0% and 150.0%, separately, due to the higher Pd 2+ content. The catalyst displays water vapor endurance, reproducibility, and 83.0% carbon balance during the whole adsorption–desorption–catalysis within 150 min, which highlights the sustainable applicability in lean VOCs abatement. Furthermore, the possible catalytic reaction pathway of toluene oxidation is proposed based on the in-situ DRIFTS experiments.
研究领域:
环境科学
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催化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
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