RSC Advances
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2015
·Vol. 5
·期 103
·84410-84422
·
IF 3.84
Hai-Min Shen,Gong-Yuan Zhu,Wu-Bin Yu,Hong-Ke Wu,Hong-Bing Ji,Hong-Xin Shi,Yi-Fan Zheng,Yuan-Bin She
Renewable β-cyclodextrin (β-CD) was immobilized onto the surface of hybrid silica using ethylenediamine as linking groups to construct an adsorbent in water treatment (CD@Si), and the obtained CD@Si was characterized through FT-IR, XPS, EDX, contact angle measurement, TGA, solid-state 13C NMR, SEM, and XRD analyses. The effect of initial pH, contact time on the adsorption performance of CD@Si for p-nitrophenol, and the adsorption kinetics, adsorption isotherms, adsorption thermodynamics, reusability and adsorption mechanism were investigated systematically, which indicate that the adsorption of p-nitrophenol onto CD@Si is a very fast process. The adsorption equilibrium can be reached in 15 s with an acceptable equilibrium adsorption capacity of 69.6 mg g−1 at pH 7.0, which is much faster than many reported adsorbents based on β-CD. The adsorption of p-nitrophenol onto CD@Si follows the pseudo-second-order model, obeys the Freundlich model, and is a feasible, spontaneous, and exothermic process which is more favorable at lower temperatures. And the formation of an inclusion complex and a hydrogen bond interaction are two origins of p-nitrophenol being adsorbed onto CD@Si. Additionally, CD@Si can be recycled and reused for at least five runs with an acceptable adsorption capacity, and is a very promising adsorbent for the fast adsorption of p-nitrophenol or its analogues from the aqueous phase. Additionally, this work also provides a strategy to increase the adsorption rate of adsorbents based on β-CD.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Mingxue Wu,Gang Chen,Ping Liu,Weihong Zhou,Qiong Jia
We designed a novel hydrazone covalent organic framework (COF) and developed a polydopamine (PDA) method to immobilize COF on a stainless steel fiber for headspace solid-phase microextraction (HS-SPME). A series of characterization studies was performed to validate the structure and property of the prepared fiber. The COF-PDA fiber was applied for the extraction of pyrethroids coupled with gas chromatography equipped with an electron capture detector (GC-ECD). Under the optimum experimental conditions, high enhancement factors of 307–2327 were achieved, indicating that the hydrazone COF possessed good extraction efficiency for pyrethroids. The detection limits ranged from 0.11 to 0.23 μg kg −1 with relative standard deviations varying in the range of 3.6–9.2% (intra-batch) and 6.9–12.1% (inter-batch), respectively. The developed method was applied to the determination of pyrethroids in fruit and vegetable samples and the accuracy was assessed through recovery experiments.
研究领域:
分析化学
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食品安全
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材料科学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Qiang Xian,Xin Xiao,Jiaping Yu,Yi Gan,Li Chen,Xinmiao He,Enchao Wang,Hui Dan,Lin Zhu,Yi Ding,Tao Duan
The immobilization of iodine waste suffers from serious iodine loss during heat treatment. Herein, we reported on the high iodine retention immobilization of simulated radioiodine-contaminated Bi0–SiO2 sorbent in B–Bi–Zn oxide glass using Bi2O3 as a stabilizer under a N2 atmosphere. The effects of the Bi2O3 content and sintering atmosphere on the iodine immobilization behaviors (iodine retention ratio, phase composition, microstructure, and chemical stability) were investigated. It was found that the decomposition of BiI3 was prevented by adding Bi2O3 and sintering in a N2 atmosphere. The iodine retention ratio in the obtained glass waste form was significantly enhanced with increasing Bi2O3 content and sintering in the N2 atmosphere due to the synergistic effect. The achieved record-high iodine retention (92.22 ± 2.6%) was much higher than that of conventional heat treatment route (18.01 ± 3.5%). The results demonstrated that iodine was effectively immobilized through the formation of stable BixOyI (Bi5O7I and BiOI). Furthermore, the obtained iodine waste form exhibited excellent compactness and chemical stability. Owing to its high iodine retention ratio, this route can be employed to effectively immobilize radioactive iodine.
研究领域:
材料科学
·
核废料管理
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-9
·
IF 5.479
Li Zhentao,Mao Zhenkun,Chen Zilin
A capillary column was modified with a soluble zinc(II)-derived metal-organic cage (MOC) [Zn 2 L] as the stationary phase to obtain a new coating layer for use in open-tubular capillary electrochromatography. The inner surface of the capillary was first coated with a layer of polydopamine. Then, a solution of the MOC in dichloromethane was introduced into the capillary upon which it is bonded both covalently and non-covalently. The resulting coating layer on the capillary was characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. The results demonstrated the successful formation of the [Zn 2 L] modified open-tubular column. The column showed good separation performance towards neutral compounds (such as methylbenzene, ethylbenzene, n-propylbenzene and n-butylbenzene), acidic drugs (such as ibuprofen, ketoprofen, flurbiprofen and diclofenac sodium), food additives (such as parabens, vanillin and related phenolic compounds) and small biomolecules (such as nucleosides and nucleotide bases) by π-interaction and hydrophobic interaction. It also exhibited good precision, the relative standard deviations of the retention time for intra-day, inter-day runs and column-to-column being <1.6%, 2.8%, and 4.0%, respectively.
Schematic presentation of the open-tubular column modified with zinc(II)-derived metal-organic cage by polydopamine-assisted strategy onto the inner wall of capillary for electrochromatographic separations.
研究领域:
分析化学
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材料科学
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DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 2
·182
·
IF 4.329
Shuo Zeng,Jinwei Shi,Anchao Feng,Zhao Wang
This study aimed to modify an electrospun regenerated cellulose (RC) nanofiber membrane by surface grafting 2-(dimethylamino) ethyl methacrylate (DMAEMA) as a monomer via atom transfer radical polymerization (ATRP), as well as investigate the effects of ATRP conditions (i.e., initiation and polymerization) on enzyme immobilization. Various characterizations including XPS, FTIR spectra, and SEM images of nanofiber membranes before and after monomer grafting verified that poly (DMAEMA) chains/brushes were successfully grafted onto the RC nanofiber membrane. The effect of different ATRP conditions on laccase immobilization was investigated, and the results indicated that the optimal initiation and monomer grafting times were 1 and 2 h, respectively. The highest immobilization amount was obtained from the RC-Br-1h-poly (DMAEMA)-2h membrane (95.04 ± 4.35 mg), which increased by approximately 3.3 times compared to the initial RC membrane (28.57 ± 3.95 mg). All the results suggested that the optimization of initiation and polymerization conditions is a key factor that affects the enzyme immobilization amount, and the surface modification of the RC membrane by ATRP is a promising approach to develop an advanced enzyme carrier with a high enzyme loading capacity.Keywords:electrospinning;atom transfer radical polymerization;nanofiber membrane;enzyme immobilization
研究领域:
生物材料学
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酶工程
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DOI
PubMed
高影响因子
Scientific Reports
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2015
·Vol. 5
·期 1
·1-13
·
IF 5.578
Ye Yi Quan,Jin Chong Wei,Fan Shi Kai,Mao Qian Qian,Sun Cheng Liang,Yu Yan,Lin Xian Yong
Cell wall is the major component of root apoplast which is the main reservoir for iron in roots, while nitric oxide (NO) is involved in regulating the synthesis of cell wall. However, whether such regulation could influence the reutilization of iron stored in root apoplast remains unclear. In this study, we observed that iron deficiency elevated NO level in tomato ( Solanum lycopersicum ) roots. However, application of S-nitrosoglutathione, a NO donor, significantly enhanced iron retention in root apoplast of iron-deficient plants, accompanied with a decrease of iron level in xylem sap. Consequently, S-nitrosoglutathione treatment increased iron concentration in roots, but decreased it in shoots. The opposite was true for the NO scavenging treatment with 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO). Interestingly, S-nitrosoglutathione treatment increased pectin methylesterase activity and decreased degree of pectin methylation in root cell wall of both iron-deficient and iron-sufficient plants, which led to an increased iron retention in pectin fraction, thus increasing the binding capacity of iron to the extracted cell wall. Altogether, these results suggested that iron-deficiency-induced elevation of NO increases iron immobilization in root apoplast by decreasing pectin methylation in cell wall.
研究领域:
植物生理学
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分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Yaoyao Zhu,Yeqiang Lu,Yuxin Shi,Xueting Zhao,Congjie Gao,Lixin Xue
Super-wetting membranes have recently attracted widespread attention for their promising application in oil/water separation. Generally, the preparation procedures of the super-wetting membranes are quite arduous, and it remains challenging to design a reasonable fabrication method. In this work, we present a facile method to prepare polyvinylidene fluoride (PVDF) based super-wetting membranes from direct immobilization of nanoparticles by in-situ polymerization and ionic cross-linking during phase inversion. The as-prepared membranes exhibited excellent amphiphilic properties, and had switchable wettability between super-oleophobic underwater and super-hydrophobic under oil. The modified PVDF membranes with such switchable wettability had high separating performance towards both surfactant-stabilized water-in-oil and oil-in-water emulsions under gravity and exhibited good durability and recyclability. This research not only provides a simple preparation method of amphiphilic super-wetting membranes, but also the unique performance of the membrane in water treatment.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yanning Qu,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
Colloidosomes are promising carriers for immobilizing enzyme for catalytic purposes in aqueous/organic media. However, they often suffer from one or more problems regarding catalytic performance, stability, and recyclability. Here, we report a novel approach for the synthesis of cross-linkable colloidosomes by the selective polymerization of dopamine at oil/water interfaces in a Pickering emulsion. An efficient enzyme immobilization method was further developed by covalently bonding enzymes to the polydopamine (PDA) layer along with the formation of such colloidosomes with lipase as a model enzyme. In this enzyme system, the PDA layer served as a cross-linking layer and enzyme support for simultaneously enhancing the colloidosomes’ stability and improving surface availability of the enzymes for catalytic reaction. It was found that the specific activity of lipases immobilized on the colloidosome shells was 8 and 1.4 times higher than that of free lipase and encapsulated lipase positioned in the aqueous cores of colloidosomes, respectively. Moreover, the immobilized lipases demonstrated excellent operational stability and recyclability, retaining 86.6% of enzyme activity after 15 cycles. It is therefore reasonable to expect that this novel approach for enzyme immobilization has great potential to serve as an important technique for the construction of biocatalytic systems.
研究领域:
材料科学
·
生物化学
·
催化工程
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DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 23
·8522
·
IF 4.927
Runtang Liu,Wei Zhang,Shushu Wang,Huajin Xu,Yi Hu
In this study, polyethyleneimine was combined with magnetic Fe3O4nanoparticles through the bridging of carboxyl-functionalized ionic liquid, and laccase was loaded onto the carrier by Cu2+chelation to achieve laccase immobilization (MCIL–PEI–Cu–lac). The carrier was characterized by Fourier transform infrared spectroscopy, scanning electron microscope, thermogravimetric analysis, X-ray diffraction analysis, magnetic hysteresis loop and so on. MCIL–PEI–Cu–lac has good immobilization ability; its loading and activity retention could reach 52.19 mg/g and 91.65%, respectively. Compared with free laccase, its thermal stability and storage stability have been significantly improved, as well. After 6 h of storage at 60 °C, 51.45% of the laccase activity could still be retained, and 81.13% of the laccase activity remained after 1 month of storage at 3 °C. In the pollutants removal test, the removal rate of 2,4-dichlorophenol (10 mg/L) by MCIL–PEI–Cu–lac could reach 100% within 10 h, and the removal efficiency could still be maintained 60.21% after repeated use for 8 times. In addition, MCIL–PEI–Cu–lac also has a good removal effect on other phenolic pollutants (such as bisphenol A, phenol, 4-chlorophenol, etc.). Research results indicated that an efficient strategy for laccase immobilization to biodegrade phenolic pollutants was developed.
研究领域:
环境科学
·
生物技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Jinze Song,Lixia Zhu,Ying Song,Zhaobo Wang,Kaixiang Shi,Xiaolei Song,Quanbing Liu,Guangfeng Wu
HE-MOF@MXene heterostructure was constructed via in situ growth. • The heterostructure combines physical blocking with chemical LiPSs anchoring. • Multi-metal synergy accelerates catalytic conversion of LiPSs. • HE-MOF@MXene//PP delivers 1445 mAh g −1 at 0.2C and 690 mAh g −1 at 5C. • HE-MOF@MXene//PP shows only 0.059% decay per cycle over 900 cycles at 1C. Lithium‑sulfur batteries (LSBs) offer high energy density, yet their performance is restricted by uncontrolled lithium polysulfides (LiPSs) migration and the intrinsically slow multistep conversion of sulfur species. To alleviate these issues, a Fe/Co/Ni/Cu/Mn high-entropy metal-organic framework (HE-MOF) was directly grown on MXene nanosheets to form an HE-MOF@MXene heterostructure, which was subsequently employed as a separator modifier in LSBs. The reciprocal structural regulation between HE-MOF and MXene effectively suppresses component aggregation and layer re-stacking, thereby increasing the accessible surface area of the heterostructure and promoting greater active-site exposure. Meanwhile, the two components are functionally integrated. The well-exposed high-entropy multimetal sites in HE-MOF can effectively exert their adsorption and catalytic advantages toward sulfur species with the assistance of the efficient electron/ion transport network constructed by MXene. Density functional theory calculations suggest distinct electronic structures and d-d interactions among the metal sites in HE-MOF. The resulting multimetal synergy may help accommodate the differentiated adsorption requirements of sulfur species and facilitate their subsequent conversion. Consequently, with the separator functionalized by HE-MOF@MXene, the cell achieves 1445 mAh g −1 at 0.2C. At a high rate of 5C, the cell still delivers 690 mAh g −1 . Moreover, continuous operation over 1000 cycles at 3C results in an average capacity loss of merely 0.060% per cycle. HE-MOF@MXene heterostructure-modified separators integrate efficient physical blocking, strong polysulfide anchoring and rapid sulfur redox reaction kinetics, effectively suppressing shuttle effects and enabling high-performance lithium-sulfur batteries. Download: Download high-res image (239KB) Download: Download full-size image
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Fei Liu,Chang Chen,Yanxin Chen,Shaowu Jiu,Yan Liu
Hierarchical brush-like calcium sulfate dihydrate micro-assemblies (H-B-CSDM) were synthesized as a high-efficiency adsorbent via a synergistic additive-mediated aqueous precipitation method. Their adsorption performance toward Cd 2+ , Pb 2+ , and Cu 2+ was systematically evaluated, and the distinct mechanisms were elucidated through multi-scale characterization and density functional theory (DFT) calculations. Under optimized conditions (pH 6.0, an adsorbent dosage of 2 g·L −1 ), H-B-CSDM achieves adsorption equilibrium for all three heavy metal ions within 60 min. Pb 2+ exhibits the highest adsorption capacity and pronounced selectivity, with an uptake of 49.0 mg·g −1 in the ternary system, which is 1.16 and 1.26 times those of Cd 2+ and Cu 2+ , respectively. The adsorption of Cd 2+ and Pb 2+ followed pseudo-second-order kinetics and the Freundlich isotherm model, indicating chemisorption-dominated heterogeneous multilayer adsorption, whereas Cu 2+ displayed multi-mechanism coupling behavior. XRD, FTIR, XPS, and SEM analyses collectively demonstrate three distinct immobilization pathways: ion-exchange-induced surface precipitation (PbSO 4 formation) for Pb 2+ , electrostatic attraction with reversible outer-sphere complexation for Cd 2+ , and surface complexation with partial lattice substitution for Cu 2+ . Density functional theory (DFT) calculations corroborate these findings: Pb 2+ exhibits the most negative adsorption energy (−0.988 eV) at surface sites, making it thermodynamically most prone to surface deposition; whereas Cu 2+ and Cd 2+ exhibit adsorption energies of −0.385 eV and − 0.211 eV, respectively, indicating a decreasing order of chemical adsorption strength, with Cd 2+ primarily undergoing weak electrostatic outer-sphere complexation. H-B-CSDM maintained high adsorption efficiency over five regeneration cycles, demonstrating the best regeneration capacity for Pb 2+ . This study provides a theoretical basis and design paradigm for upgrading gypsum-based minerals from low-cost carriers to highly efficient active adsorption platforms for treating complex wastewater.
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.6
Yize Liu,Chuanzhou Liang,Ruizhuo Lu,Zhe Liu,Xiongbo Zhan,Zhongxiong Zhou,Lin Liu,Minhua He,Bolin Li,Zhiyu Wei
Sulfamethoxazole (SMX)-degrading bacteria have been isolated previously but were rarely applied into realistic wastewater due to poor colonization and instability. In this study, an efficient SMX-degrading bacteria consortium, dominated by Pseudomonas , was enriched from activated sludge and systematically evaluated for accelerated immobilization and application in the treatment of realistic municipal wastewater. The results showed that co-substrate addition markedly enhanced consortium growth and SMX degradation. Co-substrate type further governed immobilization: glucose accelerated biofilm formation on raw carriers, whereas sucrose favored planktonic growth and required chitosan-modified electrophilic carriers for effective immobilization. Co-substrate-assisted immobilization shortened the period from over 40 d to <10 d. Moreover, the immobilized consortia exhibited a remarkably SMX degradation efficiency with ∼3 h half-life, which was strongly correlated with total attached consortium DNA ( r = 0.988). The immobilized consortia achieved stable SMX removal (>99.8%) over 30 d of cyclic operation in realistic municipal influent and effluent wastewater, respectively, proving its applicability as bio-augmentation in secondary and polishing treatment for SMX. Microbial community analysis revealed persistent Pseudomonas dominance with adaptive diversification driven by co-substrate regime, carrier type, and wastewater conditions. Overall, this study highlights rational co-substrate selection and carrier design as key determinants for efficient immobilization and long-term performance of slow-growing antibiotic-degrading consortia, providing a scalable strategy for sulfonamide antibiotics removal in wastewater treatment systems.
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高影响因子
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