RSC Advances
·
2015
·Vol. 5
·期 86
·70139-70146
·
IF 3.84
Xing-Long Li,Tao Pan,Jin Deng,Yao Fu,Hua-Jian Xu
Furfural is a biomass-based bulk chemical and its derivatives have potential applications as renewable fuels and chemicals. A water-tolerant and stable solid acid catalyst modified hydrated tantalum oxide (TA-p) was developed for catalytic conversion of D-xylose to furfural in water–organic solvent biphasic system. This process was performed both in a batch reactor and a continuous fixed-bed reactor. In the batch process, D-xylose conversion and furfural yield were significantly affected by the organic solvent, reaction temperature and reaction time. 1-Butanol, which could be obtained through the fermentation of biomass-based carbohydrates, was selected as organic phase and the highest furfural yield of 59% was achieved with D-xylose conversion of 96% at 180 °C in the continuous process. Moreover, the long-time stability test for 80 h under the optimal conditions showed the excellent stability of TA-p catalyst.
研究领域:
生物化学
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催化化学
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DOI
高影响因子
THERMOCHIMICA ACTA
·
2022
·
IF 3.378
Wei Wang,Jiancun Gao,Yujing Li,Shengnan Wang,Chenguang Shi,Xiong Dai,Tianmeng Jiang,Guangming Sun
The thermal hazard assessment of cyclohexane-type liquid crystal monomers (CLCMs) from the Grignard cross-coupling reaction is challenging because the thermal hazard assessment involves the Grignard reagent. In this study, different calorimeters in semi-batch and batch modes were used to investigate the exothermic behaviour of CLCM. The enthalpy of formation of the Grignard reagent (320.87 - 380.46 kJ mol −1 ) was higher than that of the cross-coupling reaction (70.92 - 108.68 kJ mol −1 ). The heat accumulation in semi-batch mode decreased to 12.15% when compared with 100% observed in batch mode. Furthermore, the Grignard reagent decomposed at 470.39 K, with a low activation energy ( E a ) of 110.99 - 129.67 kJ mol −1 . Finally, based on the Stoessel criticality diagram, the thermal risk of the CLCM was found to be class 4 in batch mode and class 3 in semi-batch mode. This revealed that the semi-batch mode was the most suitable dosing method for CLCMs.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Dezhi Huang,Enqi Huang,Dongyang Cai,Zhenhua Chen,Hongting Wen,Yu Wang,Dachuan Ma,Yao Lu,Xianming Liu,Dayu Liu
Digital microfluidics (DMF) features programmed manipulation of fluids in multiple steps, making it a valuable tool for sample pretreatment. However, the integration of sample pretreatment with its downstream reaction and detection requires transferring droplets from the DMF device to the outside world. To address this issue, the present study developed a modified DMF device that allows automated droplet ejection out of the chip, facilitated by a tailor-designed interface. A double-layered DMF microchip with an oil-filled medium was flipped over, with a liquid infusion port and a liquid expulsion port accommodated on the top working PCB plate and the bottom grounded ITO plate, respectively, to facilitate chip-to-world delivery of droplets. Using chemiluminescent immunoassay (CLIA) as an illustrative application, the sample pretreatment was programmed on the DMF device, and CLIA droplets were ejected from the chip for signal reading. In our workflow, CLIA droplets can be ejected from the DMF device through the chip-to-world interface, freeing up otherwise occupied electrodes for more sample pretreatment and enabling streamlined droplet microreactions and batch-mode operation for bioanalysis. Integrated with these interfacing portals, the DMF system achieved a single-channel throughput of 17 samples per hour, which can be further upscaled for more productive applications by parallelizing the DMF modules. The results of this study demonstrate that the droplet ejection function that is innovated in a DMF sample pretreatment microsystem can significantly improve analytical throughput, providing an approach to establishing an automated but decentralized biochemical sample preparation workstation for large-scale and continuous bioanalysis.
研究领域:
生物分析
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医学检测
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微流控技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 314
·期 3
·2569-2578
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IF 1.282
Chen Lifeng,Chen Yanliang,Wang Xinpeng,Wei Yuezhou,He Linfeng,Tang Fangdong
A novel silica-based anion exchange resin (SAER) was prepared to treat the uranium-contaminated water. SAER was characterized by SEM, TG, FT-IR and BET. Batch experiments were conducted to investigate its potential in removing uranium. Experimental results suggested that SAER could efficiently eliminate uranium in water solution with pH ranging from 5 to 9, and showed an amazing exchange speed and large working capacity. However, SO 4
2− , Ca 2+ and Mg 2+ showed some effects on the adsorption of uranium. It was observed that uranyl carbonate complexes could promote Ca 2+ and Mg 2+ to be adsorbed onto SAER. According to the batch results, Feasible adsorption mechanism to uranium was proposed. At last, tap water containing uranium was mixed with SAER to test its performance. Results showed that uranium was removed successfully with equilibrium pH below 7 but near neutral.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Mengxue Zhang,Liheng Xu,Changli Qi,Ming Zhang
To improve the removal efficiency of pharmaceutical antibiotics from water by adsorption technologies, it is vital to optimize the porous geometrical structure of carbonaceous adsorbents. In this study, a hierarchical porous carbon that possesses micro/meso bimodal pores (MMC) is synthesized and is employed in the adsorption of tetracycline in both batch mode and column mode. In comparison, microporous carbon, mesoporous carbon, and commercial activated carbon (AC) are induced as carbonaceous adsorbents. In batch mode adsorption, the maximum adsorbed amount of tetracycline on MMC reaches 701.31 mg/g, which is twice as much as that on AC. While in the column adsorption process, the treatment capacity and the total adsorbed amount of MMC toward tetracycline are found 10 times greater than those of AC. The porous geometrical structure of the adsorbent is revealed to play an important role in determining the adsorption efficiency in the column adsorption process with a limited contact time. The surface utilizations of MMC in the column process keep similar to that in batch adsorption, which is totally different from the remarkable decreases in other studied adsorbents. The specific bimodal porous structure of MMC benefits the full play of its adsorption potential in column operation. The channel-like mesopores of MMC are helpful in providing a low resistance for the rapid transport of tetracycline molecules, and the micropores further enhance the accessibility and availability of adsorption sites.
研究领域:
环境科学
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材料科学
·
水处理
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiao Jiang,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Zhan Shi
Versatile adsorptive materials that can efficiently capture anionic and cationic heavy metals are extremely significant in purification of complex wastewater systems. Herein, a new type of amine modified, biopolymer-derived core/shell-like adsorbents were employed in heavy metal anion and cation adsorption. The maximum adsorption capacities for Cr(VI), Pb(II), and Cu(II) were measured to be 497.1, 535.6, and 163.7 mg/g, respectively. The adsorbent also showed great performance in heavy metal cation adsorption in fixed bed column experiments. Additionally, removal efficiency and rapid adsorption kinetics on low concentration heavy metal pollutions for both anion and cations were well discussed to demonstrate the potential in real accidental heavy metal pollution. The prepared core/shell-like biopolymer adsorbents were demonstrated to be a kind of versatile adsorbent for both anionic and cationic heavy metal ions in aqueous solutions.
研究领域:
环境科学
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材料科学
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水处理
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 17
·7659-7670
·
IF 3.591
Kangjun Xie,Zhen Dong,Nan Wang,Wei Qi,Long Zhao
The selective elimination of radioactive TcO4− from radioactive waste is becoming increasingly critical for environmental security. In this work, a series of novel adsorbents (Si-IL-X, X = NO3, Cl, BF4, NTf2) modified with ionic liquids containing different anions (X) were synthesized via radiation grafting of 1-vinyl-3-ethylimidazolium tetrafluoroborate onto silanized silica and subsequent anion replacement. The surface and structural properties of the prepared adsorbents were characterized by FT-IR spectroscopy, TGA, XPS, and SEM-EDS. Subsequently, their adsorption properties for ReO4− (a nonradioactive surrogate of TcO4−) were studied in detail via batch and column experiments. The batch experiments indicated that the Si-IL-X showed high ReO4− removal efficiency over a broad pH range of 3–10, and their maximum adsorption capacities were in the range of 147.93–289.02 mg g−1 against ReO4−. It was found that the adsorption ability of Si-IL-X was related to the anion structure of the ionic liquid, and the order was Si-IL-NO3 > Si-IL-Cl > Si-IL-BF4 > Si-IL-NTf2, which was mainly determined by the hydrophilicity and ionic radius of the anions. Besides, their adsorption capacities barely decreased after electron beam radiation of 800 kGy. In column experiments, the adsorbents exhibited excellent selectivity and could capture ReO4− efficiently from simulated radioactive wastewater containing a large number of coexisting ions. In addition, the XPS and FT-IR spectroscopic analyses indicated that adsorption was carried out by an ion-exchange process. The results suggested that Si-IL-X showed excellent application prospect for efficient capture of TcO4− from Hanford waste and other common acidic radioactive wastes.
研究领域:
环境科学
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核化学
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材料科学
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产品关联
DOI
高影响因子
BIOTECHNOLOGY PROGRESS
·
2019
·Vol. 35
·期 3
·e2777
·
IF 2.406
Binglin Li,Jiao Wang,Jing Li,Xiaoli Zhang,Wenyu Yu,Huan Wang,Dandan Duan,Binxia Zhao
The efficient and environmentally friendly aqueous-solid systems employed Triton-X-100-modified silica as the “artificial interface” to adsorb phosphatidylcholine (PC) in purely aqueous solutions and silica-adsorbed PC was successfully used for phospholipase D (PLD)-mediated transphosphatidylation. Three kinds of silicas with different sizes were employed to investigate advantages and disadvantages of batch and continuous technologies for PLD-catalyzed transphosphatidylation in aqueous-solid systems. The highest yields of product were obtained in the batch technology, but the continuous production had the simplest operational process and highest space–time yield. After transphosphatidylation, the product adsorbed on carriers were eluted by coconut oil and used to manufacture relevant hard, soft, and micro-capsules. Special attention has been paid to the preparation of microcapsules. Toxic solvents were completely avoided in the whole technological process including production and product packaging. © 2019 American Institute of Chemical Engineers Biotechnol. Prog ., 35: e2777, 2019.
研究领域:
化学工程
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生物技术
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Zhenxiong Ye,Huidi Zhang,Xujie Chen,Lifeng Chen,Kunyapat Thummavichai,Xinpeng Wang,Toyohisa Fujita,Yuezhou Wei
Palladium is versatile in many industrial applications due to its distinct physicochemical properties . Due to the scarcity of natural resources and the growing market demand, palladium recovery from wastes such as spent catalysts is receiving increasing attention. Here, a silica-supported thiourea resin (SiPS-TU) was prepared and applied to separate Pd(II) from spent catalysts. The SiPS-TU was fabricated through in situ polymerization and post modification method using amorphous macroporous silica as the matrix. Experimental results suggested that the optimal acidity for the adsorption process was 0.1 M under selected range, and the uptake of SiPS-TU was affected by H + and Cl − . The adsorbent showed rapid sorption kinetics with an equilibrium attained in 30 min, while more than 3 h was required for the commercial D840 resin. Column tests showed that SiPS-TU had excellent dynamic separation property for Pd(II) in continuous process. Around 215 bed volumes (430 mL) of Pd(II) solution could be effective treated by the SiPS-TU bed before breakthrough at 4 mL/min, while D840 resin bed was less effective under equivalent conditions (20 mL). In view of its satisfactory adsorption performances, palladium was successfully separated from the catalyst leaching solution by SiPS-TU. XPS spectra and DFT calculations indicated that the adsorption mechanism of SiPS-TU for Pd(II) mainly involved anion exchange and coordination. In conclusion, this study provides a feasible material for palladium recovery from practical leachate.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 1
·385-394
·
IF 1.137
Bao Shidong,Li Ye,Fei Zhengfu,Mei Heng,Zhou Yuzhi,Wang Xiaoli,Liu Dongxue
Ureido-functionalized ethylene-bridged mesoporous silica (UE-MS) was synthesized by co-condensation method for uranium(VI) uptake. The adsorbents were characterized by SEM, EDS, FTIR, BET and TGA. Through batch experiments, the effects of main factors on U(VI) sorption were investigated. The results indicated this adsorption was very fast with an equilibrium time of 30 min and negligibly affected by coexisting cations. At the optimum pH of 7, removal efficiency can exceed 99% with only 0.6 g/L of UE-MS dose. Furthermore, the adsorption process by UE-MS followed the quasi-second-order model and Freundlich model, and this process was spontaneous and endothermic.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Jiaojie Wu,Yongming Wei,Shuqin Li,Junjie Zhou,Zhenliang Xu
Immobilized metal affinity chromatography (IMAC) ensures the specific purification of proteins containing histidine tags through high affinity with transition metal chelators, which has various applications in biological protein separation. Most chromatographic separations currently use a fixed bed. In this form, internal flow pressure drops very sharply, accompanied by uneven solution flow, pore blockages, etc., all of which greatly reduce separation efficiency. Therefore, this study uses hollow fiber membranes (HFMs) with micron-scale inner diameters as a base, thus reducing operating pressure and significantly enhancing mass transmission. Batch adsorption experiments were performed using flat plate membranes to obtain the reaction's thermodynamic and kinetic model parameters for use in a dynamic column breakthrough simulation. The numerical simulation was based on a single HFM model and established a mathematical model for computational fluid dynamics (CFD) in ANSYS Fluent software. Model accuracy was validated by combining the simulation with experiments. The effects of different module and process parameters on the breakthrough curve were investigated by varying parameters such as flow rate, initial feed concentration, and HFM inner diameter. Design parameters and operating conditions contributing to module utilization were subsequently obtained.
研究领域:
生物技术
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化学工程
·
生物化学工程
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yifan Gu,Mingyu Liu,Mengmeng Yang,Weili Wang,Shusheng Zhang,Runping Han
ABSTRACT Polyethyleneimine (PEI)-functionalized carboxylated multi-walled carbon nanotubes (MWCNTs) were used as an adsorbent (PEI-CNTs) to adsorb light green (LG) dyes (anionic dye) from solution. The structure and morphology of PEI-CNTs was characterized by transmission electron microscope, Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). FTIR and XPS results showed that PEI was successfully loaded on MWCNTs. Raman analysis showed that the basic structure of MWCNTs did not change after the modification of PEI. The effects of pH and coexisting ions on the adsorption properties were studied. Batch adsorption and kinetic studies showed that the PEI-CNTs nanocomposite materials were efficient to remove LG from solution. The optimum condition for adsorption was pH 3. The adsorption of LG solution reached equilibrium within 5 h of contact time with a removal of 97%. Adsorption quantity was 469 mg·g –1 at 293 K. Adsorption equilibrium data can be predicted by Langmuir model and Koble–Corrigan model, while the kinetic adsorption data followed pseudo-second-order model. The thermodynamic results showed that the adsorption was a spontaneous process with endothermic reaction and entropy increasing. LG-loaded adsorbent can be regenerated using 0.010 mol·L –1 of NaOH solution.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）