Chemical Engineering and Processing-Process Intensification
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2022
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IF 4.264
Mengfei Tian,Xianming Meng,Naveed Ahmad,Chunying Li,Zhanyu Yuan,Zidan Luo,Yu Zhang,Chunyu Liang,Chunjian Zhao
Juglone was first preliminary purified by back extraction (BE) which also completed the sustainability of microemulsion as a solvent for extraction of juglone in J. mandshurica Maxim. branches. Then, magnetic solid phase extraction (MSPE) based on bubble column (BC) was proposed to further purify the juglone, GO/ND/Fe 3 O 4 as adsorbent, which broke through the limitation that MSPE is only suitable for trace enrichment. Thus, a BE combined with MSPE based on BC (BE-MSPE/BC) technology to separate and purify juglone from J. mandshurica Maxim. was developed. Under the optimal conditions (optimal adsorption conditions: 0.5 h of adsorption time, 30 mg/mL of solid-liquid ratio, 5.5 of pH, 60 L/min of air flow; optimal desorption conditions: 0.4 h of desorption time, methanol of desorption agent, 100% of desorbent volume fraction, 8 of pH, 40 mg/mL of solid-liquid ratio, 80 L/min of air flow rate), the recovery yield and purity of juglone obtained by BE-MSPE/BC were 80.57% and 72.38%, respectively. BE-MSPE/BC, as a green separation and purification technology that can easily achieve large-scale and sustainable production, is expected to be an alternative method to separate and purify active components in biomass materials and products.
研究领域:
植物化学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
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2024
·
IF 6.4
Lirong Li,Zhiping Xiao,Sihan Liu,Chengwei Xu
Methanol-based physical absorption, known for its effective CO 2 capture ability, has been employed in acid gas removal (AGR) unit. However, the high energy consumption associated cooling methanol and acid gas hampers its widespread adoption. To address this challenge, numerous studies have explored the use of nanoparticles to enhance the CO 2 absorption at room temperature, thereby reducing the energy requirements. In this study, the objective is to synthesize and characterize the Al 2 O 3 -methanol nanofluid and investigate its application in a bubble column for improved mass transfer rates during CO 2 absorption. The methanol based Al 2 O 3 nanofluid was prepared using the two-step method with ultrasonication technology and CO 2 absorption in the resultant product was investigated. Initially, 0.001 vol%, 0.01 vol % and 0.1 vol% Al 2 O 3 nanoparticles was added to methanol solution and to mixture them well via ultrasonication technology. The static settlement method and zeta potential analysis were utilized to characterize the stability of the as-prepared nanofluid. Both impact of sonication power and time on the stability of nanofluid were discussed as well. Then, numerical simulations was employed to investigate the mass transfer coefficient for CO 2 absorption and the numerical uncertainty was carefully analyzed to verify the reliability of the numerical method. It revealed a 7.3%, 29.2% and 60.7% enhancement in mass transfer coefficient during CO 2 absorption for 0.001 vol%, 0.01 vol% and 0.1 vol% nanoparticles under room temperature, respectively. The visualized reason for this improvement was related to the enhanced bubble breakup and coalescence after adding nanoparticles to methanol. The expanded interfacial area between gas and liquid plays a vital role in the mechanism of this improvement.
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
Chemical Engineering and Processing-Process Intensification
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2025
·
IF 3.9
Shuang Wang,Weicheng Pan,Haijiang Zhang,Hao Chen,Rong Chen
To enhance the mass transfer and organic pollutants oxidation in the plasma bubble column reactor (BCR), a Venturi tube was utilized to produce flowing wastewater containing plasma microbubbles by hydrodynamic cavitation (HC) effect. Meanwhile, the convection of wastewater was optimized through adjusting Reynolds number at the throat of the Venturi tube ( Re T : 5870 – 56,300). The variation of C v and ΔP with the Re T revealed the starting point of the HC at the Re T of 24,600 (210 L·h -1 ). The HC effect reduced the minimum plasma bubble size d to 100 μm and increased the gas holdup of plasma bubbles (11 %). Comparing the plasma bubbling mode without liquid flow, energy yield ( EY ) of plasma degradation (2333 mg·kWh -1 at the removal of 90 %) and the volumetric mass transfer coefficient ( k l a = 0.037 s -1 ) was improved by 1.63 and 3.08 times, respectively. The dimensionless mass transfer correlation among Reynolds number Re (220 – 2113), Froude number Fr (0.0019 – 0.0075), initial concentration difference ( c 0 / c 50 : 0.5 – 2.0), and Sherwood number Sh in the HC-BCR have been established. This study provides insights to optimize the convection of wastewater in the HC channel for the enhancement of plasma oxidation in the BCR.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2018
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IF 7.051
Da Wang,Haodan Xu,Jun Ma,Stefanos Giannakis,Xiaohui Lu,Huizhong Chi,Shuang Song,Jingyao Qi
A light-weight granular mixed-quartz sand (denoted as L-GQS) combined with stirring-assisted bubble column reactor was firstly applied in catalytic ozonation of atrazine. The L-GQS, with a density of 2.36 g cm −3 and average diameter of ca. of 4 mm, was readily churned up and uniformly distributed within the solution in the reactor. The introduction of L-GQS was found to exhibit enhanced catalytic ozonation of atrazine, with the increase in degradation rate and the dissolved organic carbon (DOC) removal being more than 2-fold for the catalytic process (L-GQS dosage = 5 g L −1 , [atrazine] 0 = 50 μM, [O 3 ] = 25 mg L −1 , gas flow = 0.2 L min −1 , at pH 7.0 and 293 K). The L-GQS settled at the bottom of the reactor after experimentation, allowing its easy separation from the solution. A complete characterization of the material (XRD, XPS, FTIR , FE-SEM/EDS, BET and pH pzc ) revealed that L-GQS consisted of α-quartz, β-cristobalite, anorthoclase and small amount of iron oxy-hydroxides. Hydroxyl groups, Bronsted acid sites and Lewis acid sites on the surface of L-GQS all contributed to the atrazine adsorption, ozone decomposition and ·OH generation. The L-GQS catalyzed ozonation exhibited superior atrazine degradation and mineralization rates in a wide range of pH (3.0–9.0) and reaction temperatures (278 K–293 K). Also, an enhancement of DOC abatement was observed both in presence of natural organic matter isolates and natural water matrices (river water) when L-GQS was used. Finally, the degradation mechanism was proposed, based on the intermediates and by-products formation analyzed by LC-QTOF-MS/MS and ionic chromatography. Our results indicate that the L-GQS combined with stirring-assisted bubble column reactor could be utilized as an enhancement of ozone-based advanced oxidation processes .
研究领域:
环境科学
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化学工程
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水处理
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
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2020
·Vol. 4
·期 6
·2768-2774
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IF 5.503
Qinghai Yang,Congquan Zhou,Jihong Ni,Xiaofei Guan
We present a liquid catalytic system comprising a liquid Ni–Bi alloy and a molten K2CO3 salt, which completely resolves the coking and sintering issues for dry reforming. The conversions of CH4 and CO2 reach 60% and 70%, respectively, in a 30 cm bubble column comprising 15 cm Ni0.27Bi0.73 and 15 cm K2CO3 at 1050 °C. The CO selectivity is near 100% throughout the temperature range of 950–1050 °C. A 120 hour stability test at 1000 °C shows no performance degradation, suggesting a stable and effective dry reforming process for syngas production. The catalytic performance and durability demonstrated highlight the potential of dry reforming for commercial applications.
研究领域:
化学工程
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催化
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）