FARADAY DISCUSSIONS
·
2016
·Vol. 190
·219-230
·
IF 3.544
Yong-Qi Li,Huan Liu,Peng Wang,Da Yang,Xiao-Li Zhao,Ye Liu
A highly efficient and stable Rh–P catalytic system in the RTIL of [PEmim]BF4 was developed for the biphasic hydroformylation of 1-octene by using the diphosphine-functionalized ionic liquid (FIL) of 2. While 2-Rh(acac)(CO)2 was immobilized in [PEmim]BF4 (solvent), a typical biphasic catalysis was fulfilled with advantages of facile separation and recycling ability – 9 runs without any loss of activity. It was found that not only the acquired π-acceptor character of 2, but also the synergetic role of the piperidyl group in [PEmim]BF4 as an N-containing donor, cooperatively contributed to the efficient hydroformylation due to the facilitated formation and stability of the Rh-H active species (ν 2045 cm−1). This was supported by the in situ high-pressure FT-IR spectral analysis.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Cheng Ye,Jing Deng,Lingyi Huai,Anhong Cai,Xiao Ling,Hongguang Guo,Qiongfang Wang,Xueyan Li
Organoarsenic contaminants existing in water body threat human health and ecological environment due to insufficient bifunctional treatment technologies for organoarsenic degradation and inorganic arsenic immobilization. In order to safely and efficiently treat organoarsenic contaminants discharged into the aquatic environment, Co-Mn-Fe layered double hydroxide (CoMnFe-LDH) and Co-Mn-Fe layered double oxide (CoMnFe-LDO) were fabricated and employed as peroxymonosulfate (PMS) activator for organoarsenic degradation and inorganic arsenic immobilization, and p -arsanilic acid ( p -ASA) was selected as target pollutant. Results demonstrated that the satisfactory removal of p -ASA (100.0%) in both CoMnFe-LDH/PMS and CoMnFe-LDO/PMS systems was obtained within 30 min, and substantial inorganic arsenic adsorption could be achieved (below 0.5 mg/L) in two systems with converting major inorganic arsenic species to arsenate. As XPS, ESR and quenching experiment revealed, the existence and generation of surface-bound radicals in two systems were identified. Based on density functional theory calculation and XPS analysis, the catalytic mechanism of CoMnFe-LDO/PMS system that PMS could be activated via direct electron transfer from adsorbed p -ASA was clarified, which differed from PMS activation via coupling with surface hydroxyl groups in CoMnFe-LDH/PMS system. Catalytic performance assessment under various critical operation parameters indicated that CoMnFe-LDH presented more stable ability of p -ASA removal in a wide pH range and complex aquatic environment. The recycle experiment demonstrated the excellent stability and reusability of CoMnFe-LDH(LDO). Besides, seven degradation products of p -ASA in CoMnFe-LDH/PMS system including phenolic compounds , azophenylarsonic acid, nitrobenzene and benzoquinne were identified by UV–Vis spectra and LC-TOF-MS analysis, and the corresponding degradation pathway was proposed. In summary, compared to CoMnFe-LDO/PMS, CoMnFe-LDH/PMS holds great promise for the development of an oxidation-adsorption process for efficient control of organoarsenic pollutant.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yeqiang Lu,Yawen Zhao,Yuexiu Li,Zhihao Li,Congjie Gao,Lei Qin,Zhishan Chen,Lixin Xue
Superwetting membrane have gained significant attention as a highly effective solution for oily wastewater treatment. However, its effectiveness was restricted when separating different types of oil-in-water (O/W) and water-in-oil (W/O) emulsions due to the limited single wettability of the membrane surfaces. Developing superwetting membranes with broad applicability and high separation efficiency is crucial for the continued advancement of membrane separation technology. In this study, a hydrophilic polymer, poly 2-hydroxybutyl methacrylate (PHBMA) was introduced into the polyacrylonitrile (PAN) substrate, and zeolitic imidazolate framework-90 (ZIF-90) particles were synchronously grown and in-situ immobilized on the membrane surface in process of phase inversion, forming a ZIF-90@P-PAN membrane with switchable superwettability. With increasing ZIF-90 growth time, the membrane surface first became rougher due to crystal formation, then gradually denser as particle accumulation increased. This membrane exhibited super-amphiphilicity in air and super-amphiphobicity under liquid, demonstrating high permeation flux and excellent separation efficiency (>99 %) for different types of emulsions. The effects of ZIF-90 particles with different growth times on the membrane morphology, wettability and oil–water separation performance were systematically studied. Additionally, the removal efficiency (>80 %) and recycling performance of the ZIF-90@P-PAN membrane for four different heavy metal ions were investigated. This work contributed to the development of superwetting membranes for efficient recovery of oily wastewater.
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Catalysts
·
2026
·Vol. 16
·期 4
·312
·
IF 4.5
Xuelai Zhao,Wuyu Wang,Zhenjing Jiang,Xinghua Zhang,Xiuzheng Zhuang,Qi Zhang,Longlong Ma
The homogeneous nature of L-proline organocatalysts restricts their application in aldol condensation due to poor recyclability and stability. Herein, L-proline was heterogenized by ionic intercalation into Mg–Al layered double hydroxides (LDHs), yielding a series of proline-intercalated catalysts with tunable layer structures. Co-precipitation and memory-effect reconstruction strategies were employed to regulate interlayer spacing and proline loading. The resulting catalysts exhibited efficient performance in the aldol condensation of furfural with ketones under mild conditions. The reconstructed catalyst re-Mg4Al1P achieved a furfural conversion of 88.67% and a total product yield of 85.54% at room temperature, with product selectivity exceeding 95%. Structural characterizations confirmed that proline was stabilized within the LDH interlayers via R–COO—Mg electrostatic interaction while preserving the secondary amine active site. Mechanistic analysis indicated that the reaction proceeded through enamine- or enol-mediated pathways depending on water content, while the layered LDH framework imposed geometric confinement that suppressed side reactions. Catalyst deactivation in aqueous systems was mainly attributed to proline leaching rather than structural collapse.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Luzi Yuan,Qingliang Zhao,Ruiyuan Xue,Liangliang Wei,Guangzhi Wang,Jing Ding,Junqiu Jiang,Kun Wang
Groundwater contaminated with toxic metals and petroleum hydrocarbons presents long-term risks due to the different transport and removal mechanisms of these contaminants. Co-occurrence of hexavalent chromium (Cr(VI)) and benzene (C 6 H 6 ) is particularly challenging, requiring combined redox transformation and hydrophobic adsorption for effective remediation. In this study, a porous and mechanically robust permeable reactive barrier (PRB) material, composed of sodium alginate, nanoscale zero-valent iron, and activated carbon (SA–nZVI–AC) was synthesized using a combined sol–gel and freeze-drying method. Unlike conventional nZVI systems that primarily focus on metal reduction, this composite integrates polymer stabilization, carbon adsorption, and iron-mediated redox for simultaneous removal of mixed metal–organic pollutants. Freeze-drying proved to be a key processing step, improving structural integrity, anti-clogging capacity, and thus long-term applicability of nZVI-based PRBs. Material characterization revealed a mesoporous framework, stabilized iron phases, and abundant oxygen-containing functional groups. Batch experiments demonstrated efficient simultaneous removal of Cr(VI) and C 6 H 6 , with adsorption kinetics following pseudo-second-order models ( k 2 values for total Cr and C 6 H 6 were 0.50 and 0.06 g mg −1 min −1 , respectively) and isotherms fitting the Langmuir model. Removal efficiencies exceeded 95.28% for Cr(VI) and 85.11% for C 6 H 6 at pH 7–9 and remained high (>78.15% and > 91.31%, respectively) under interfering ions. Column experiments confirmed sustained contaminant attenuation with breakthrough delayed to approximately 60 days. Cr(VI) was immobilized within the barrier through coupled adsorption and reduction, while C 6 H 6 was effectively retained via physical adsorption within the PRB matrix. Post-column microbial analyses suggested secondary biochemical interactions within the PRB. These results demonstrate that freeze-dried SA–nZVI–AC functions as a coupled adsorption–reduction–immobilization system, showing strong potential for long-term PRB applications in remediating groundwater co-contaminated with metals and organic compounds.
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Tong Sun,Wenyue Sun,Shutong Lin,Yan Liu,Lili Lu
α-Galactosidases with high activity and stability are crucial for industrial applications, such as the hydrolysis of raffinose family oligosaccharides (RFOs) in soymilk. In this study, four novel cross-linkers, including dimethyl pimelimidate (DMP), dimethyl suberimidate (DMS), bis(sulfosuccinimidyl)suberate (BS 3 ), and bis- N -succinimidyl-(pentaethylene glycol) ester [BS(PEG) 5 ], were first applied to directly cross-link active α-galactosidase inclusion bodies. This simple approach generated stable and recyclable cross-linked enzyme aggregates (CLEAs) without precipitation or the need for carrier matrices. The resulting CLEAs showed 95–100% activity recovery, far exceeding that of glutaraldehyde (45%). All CLEAs exhibited broad pH and thermal stability, holding over 94% of their initial activity after 10 batches for RFOs hydrolysis in soymilk. Specifically, DMS-CLEAs maintained nearly 100% hydrolysis efficiency throughout 10 cycles. CLEAs prepared with the short-arm cross-linkers demonstrated superior enzyme activity recovery compared to those formed with the long-arm ones. These findings highlight the potential of α-galactosidase CLEAs for legume-based food processing.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Guoying Fu,Lei Cai,Peihang He,Yan Wang,Yingqi Zhang,Enxue Xie,Liang Li,Zedong Zhang,Guoqiang Wu
A series of Candida antarctica lipase B (CALB) catalysts immobilized on two-dimensional planar ZSM-5 zeolite (denoted as x CAL/ZSM-5-P) were developed for the efficient and green esterification of capric acid (CA) and glycerol (Gly) to synthesize medium-chain glycerides (MCGs). Comprehensive characterizations, including X-ray diffraction, Fourier-transform infrared, scanning electron microscopy, transmission electron microscopy, N 2 physisorption, and thermogravimetric analysis, confirmed the successful immobilization and uniform dispersion of lipase of CALB on ZSM-5-P via sulfhydryl modification. The framework structure of ZSM-5-P remained structurally intact after immobilization. The CAL/ZSM-5-P catalysts exhibited outstanding catalytic performance in the esterification reaction. Notably, the 9CAL/ZSM-5-P catalyst achieved the highest CA conversion of 66.94 %, with nearly 100 % selectivity toward MCGs—substantially outperforming bare ZSM-5-P (without immobilized lipase), which showed only 0.19 % conversion. Additionally, 9CAL/ZSM-5-P demonstrated excellent catalytic stability and chemical robustness. A possible mechanism for the CALB/ZSM-5-P-catalyzed esterification of CA to MCGs was also proposed. This approach provides both theoretical insight and practical guidance for developing MCGs as food emulsifiers and functional oils via heterogeneous catalytic esterification using immobilized lipase in the food industry.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiacong Wu,Juan Han,Yanli Mao,Lei Wang,Yi Wang,Yuanyuan Li,Yun Wang
A metal–organic frameworks (MOFs) with adjustable mesopores was prepared through bionic mineralization using protein as template in this paper. By regulating the content of bovine serum, pore structures of different sizes (6.46, 7.55, 10.80 nm) were obtained, used for the immobilization of enzymes (HRP, laccase and cellulase). It was found that the UIO-66 with a pore size of 6.46 nm exhibited the highest loading capacities for the investigated three enzymes. Under optimized conditions for immobilization, the maximum loading capacity of HRP, laccase and cellulase was 205.7, 214.2 and 203.9 mg g −1 , respectively. It should be noted that the stabilities of the three immobilized HRP@UIO-66, laccase@UIO-66 and cellulase@UIO-66 were significantly improved due to the favorable fitting between the pore size of the carrier material and the enzyme molecular size. In particular, the substrate affinity of the immobilized HRP@UIO-66 (0.120 g L −1 ) is similar to that of free HRP (0.122 g L −1 ). It is mainly due to that the appropriate porous structure of the carrier could avoid the obstruction of the substrate mass transfer channel after the adsorption of enzyme molecules. Moreover, the porous structure has a certain enrichment effect on the substrate, which promotes the catalytic efficiency of immobilized enzymes.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Heng Zhao,Junhua Sun,Yanjie Du,Miaomiao Zhang,Zhen Yang,Jianhui Su,Xiujing Peng,Xiaolei Liu,Guoxin Sun,Yu Cui
Lead is a toxic heavy metal that is highly harmful to humans. Developing fast, efficient, and separable materials to treat lead-contaminated wastewater is challenging. In this paper, Cu-based MOF composite (SCC-CuMOF) was prepared by in-situ growth method and used for the removal of Pb 2+ from aqueous solutions. The obtained materials were characterized by field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS) mapping, Brunauer-Emmett-Teller (BET) specific surface area, X-ray diffraction (XRD) and infrared spectroscopy (IR). The effects of pH, coexisting ions, contact time, initial ion concentration, and temperature on the removal of Pb 2+ were investigated. SCC-CuMOF exhibited excellent adsorption performance on Pb 2+ . Adsorption of Pb 2+ on SCC-CuMOF were in accordance with the pseudo-second-order model and Langmuir model. The adsorption thermodynamic study suggested that the adsorption process was spontaneous and endothermic. The results revealed that Pb 2+ might be adsorbed onto SCC-CuMOF via ion exchange and coordination interaction. In general, SCC-CuMOF has the potential to remove Pb 2+ from wastewater rapidly and efficiently.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Geling Kuang,Zichen Wang,Xiuyan Luo,Zixin Geng,Jiandong Cui,Muhammad Bilal,Ziyuan Wang,Shiru Jia
The hydrolysis of natural oils (vegetable oils and fats) by lipase has significant applications in food and medicine. However, free lipases are usually sensitive to temperature, pH and chemical reagents in aqueous solutions, which hinders their widespread industrial application. Excitingly, immobilized lipases have been widely reported to overcome these problems. Herein, inspired by lipase interface activation, a hydrophobic Zr-MOF (UiO-66-NH 2 -OA) with oleic acid was synthesized for the first time in an emulsion consisting of oleic acid and water, and the Aspergillus oryzae lipase (AOL) was immobilized onto the UiO-66-NH 2 -OA through hydrophobic interaction and electrostatic interaction to obtain immobilized lipase (AOL/UiO-66-NH 2 -OA). 1 H NMR and FT-IR data indicated that oleic acid was conjugated with the 2-amino-1,4-benzene dicarboxylate (BDC-NH 2 ) by amidation reaction. As a result, the V max and K cat values of AOL/UiO-66-NH 2 -OA were 179.61 μM﹒min −1 and 8.27 s −1 , which were 8.56 and 12.92 times higher than those of the free enzyme, respectively, due to the interfacial activation. After treated at 70 °C for 120 min, the immobilized lipase maintained 52 % of its original activity, but free AOL only retained 15 %. Significantly, the yield of fatty acids by the immobilized lipase reached 98.3 % and still exceeded 82 % after seven times of recycling.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Liqin Liu,Xingye An,Xiaohong Zhang,Zhengbai Cheng,Jinhuan Guo,Shuangxi Nie,Haibing Cao,Hongbin Liu,Yonghao Ni
Recently starch based bio-latexes are facing serious bottlenecks in their preparation and applications especially at the aspects of high concentration, high colloidal stability and high rheological performance. Starch paste for bio-latex production at high concentration would be prone to retrogradation and inevitably deteriorate its performance. The excessive and uncontrollable α-amylase hydrolysis behavior of starch granules at low concentration below 30 wt% could severely affect the strengthening or binding ability of bio-latex. Herein, this study proposes a practical and effective strategy by using cationic cellulose nanocrystals (CCNC) as versatile carriers of α-amylase for the preparation of starch based bio-latex (SBL) to improve starch hydrolysis efficiency even at 50 wt% concentration. CCNC immobilized α-amylase (CCNC/E) can effectively regulate starch hydrolysis behavior with controllable amylose/ amylopectin molecular weight/ distribution for enhanced colloidal stability and viscoelasticity. Furthermore, the multifunctional roles of CCNC as excellent dispersants, nano-fillers and enhancers within starch colloids could impart SBL excellent rheological property and printability in pigmented coating and printing performance, by improving the coating surface, higher printing density/ picking velocity, and lower dot gain phenomenon, compared with the control latex samples. This study proposes a promising and practical approach for efficient production of 50 wt% starch based bio-latex with advanced performance and further valorizes the cellulose nanocrystals in the starch based biomaterials applications.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2022
·Vol. 45
·期 6
·1075-1088
·
IF 3.434
Wei Kaixin,Wu Xiaomei,Ma Baodi,Li Zhi,Xu Yi
A series of nickel-incorporated SBA-15 mesoporous molecular sieves (Ni-SBA-15) were prepared as support for the immobilization of his-tagged recombinant Microbacterium esterase. The Ni-SBA-15 could strongly and specific absorb the his-tagged esterase from cell disrupted supernatant. It was found that the nickel amount in Ni-SBA-15 has dramatic influence on the activity and thermo-stability of immobilized enzyme, while the kinds of nickel precursor had little effect on enzyme stability. The morphology, chemical composition and structure of the best support NiCl 2 -SBA-15 (Ni-SBA-15 prepared from NiCl 2 precursor) were characterized by various spectroscopy techniques. The immobilized esterase retained full activity of free esterase and showed high immobilized yield (> 90%) with higher thermo-stability, pH stability and organic solvent resistance compared with free enzyme. The optimum reaction temperature increased from 35 to 40 °C and the optimal reaction pH moved from 10.0 to 8.0 after enzyme immobilization. The immobilized esterase exhibited excellent storage stability and keeping 92% of the initial activity after 30 days’ storage at 25 °C. In addition, the immobilized esterase had excellent reusability for the synthesis of key chiral intermediate of d -biotin and the substrate conversion could still keep 100% after 13 cycles continuously. Finally, optical pure (4 S , 5 R )-hemiester was obtained in 80.8% isolated yield and 99% purity in the gram preparative scale.
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危险品化学品经营许可证（带存储）