ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2024
·Vol. 46
·期 8
·1-12
·
IF 3.2
Xu Ren-kou,Nkoh Jackson Nkoh
Soil organic matter plays an important role in cadmium adsorption and immobilization. Since different organic matter components affect cadmium adsorption processes differently, selecting the right organic substrate and knowing how to apply it could improve cadmium remediation. This study compares the effects of two contrasting organic molecules; chitosan and citric acid, on cadmium adsorption and speciation in acidic Ultisol. The adsorption of chitosan to Ultisol significantly increased the soil positive charge while adsorption of citric acid increased the soil negative charge. At pH 5.0, the maximum amount of cadmium adsorbed in excess chitosan was 341% greater than that in excess citric acid. About 73–89% and 60–62% of adsorbed cadmium were bound to Fe/Mn oxides and organic matter/sulfide at pH 4.0 while this fraction was 77–100% and 57–58% for citric acid and chitosan at pH 5.0, respectively. This decrease in the complexing ability of chitosan was related to the destabilizing effect of high pH on chitosan’s structure. Also, the sequence through which chitosan, citric acid, and cadmium were added into the adsorption system influenced the adsorption profile and this was different along a pH gradient. Specifically, adding chitosan and cadmium together increased adsorption compared to when chitosan was pre-adsorbed within pH 3.0–6.5. However, for citric acid, the addition sequence had no significant effect on cadmium adsorption between pH 3.0–4.0 compared to pH 6.5 and 7.5, with excess citric acid generally inhibiting adsorption. Given that the action of citric acid is short-lived in soil, chitosan could be a good soil amendment material for immobilizing cadmium.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-13
·
IF 5.3
Gao Lu,Zhang Ling,Yang Juanli,Ma Tong,Wang Bo,Yang Huan,Lin Feng,Xu Xuechao,Yang Zhen-quan
A broad host range phage-based nanozyme (Fe-MOF@SalmpYZU47) was prepared for colorimetric detection of multiple Salmonella enterica strains. The isolation of a broad host range phage (SalmpYZU47) capable of infecting multiple S. enterica strains was achieved. Then, it was directly immobilized onto the Fe-MOF to prepare Fe-MOF@SalmpYZU47, exhibiting peroxidase-like activity. The peroxidase-like activity can be specifically inhibited by multiple S. enterica strains, benefiting from the broad host range capture ability of Fe-MOF@SalmpYZU47. Based on it, a colorimetric detection approach was developed for S. enterica in the range from 1.0 × 10 2 to 1.0 × 10 8 CFU mL −1 , achieving a low limit of detection (LOD) of 11 CFU mL −1 . The Fe-MOF@SalmpYZU47 was utilized for detecting S. enterica in authentic food samples, achieving recoveries ranging from 91.88 to 105.34%. Hence, our proposed broad host range phage-based nanozyme exhibits significant potential for application in the colorimetric detection of pathogenic bacteria. Graphical Abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ruirui Li,Wei Zhuang,Yan Gao,Yahan Bai,Keke Zhang,Zhenfu Wang
Herein, UiO-66 was selected as the immobilization carrier of Rhizomucor miehei lipase (RML). After etching and hydrophobic modification, the functionalized UIO-66 (H-UIO-66-OPA) was utilized for RML immobilization and the obtained RML@H-UIO-66-OPA showed about 70 % relative activity after incubation at 60 °C, which was much better than RML (20 %). RML@H-UIO-66-OPA was used in the synthesis of 1,3-dioleic acid glycerol (1,3-DAG) and the effects of reaction conditions (temperature, enzyme addition, substrate molar ratio, and time) on 1,3-DAG yield were investigated. Under the optimal conditions (temperature of 65 °C, enzyme addition of 2 wt%, substrate molar ratio of 2:1, and reaction time of 4 h), 1,3-DAG yield reached 77 %. Finally, Box-Behnken experimental design method was utilized to optimize the process parameters for the preparation of 1,3-DAG, and the final 1,3-DAG content was 79.80 %, which demonstrated that the model could predict the relationship between the factors and be suitable for the process optimization in 1,3-DAG preparation.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qingyuan Xue,Linyan Cheng,Qinghua Qu,Lingwei Yang,Cheng Fang,Hongping Li,Jing Ding,Hui Wan,Guofeng Guan
Covalent organic frameworks (COFs) and ionic liquids (ILs) as raw materials exhibit effective catalytic performance and adsorption capabilities in the reaction of epoxides and atmospheric CO 2 , respectively. Nonetheless, bonding modes between ILs and COFs have restricted their utility, thereby constraining the in-depth study of synergistic catalytic mechanisms over these composite catalysts. Herein, a heterogeneous composite ([DBUH] 2 Cys@COF-X) were successfully prepared by the facile acid-base neutralization method, incorporating varying amounts of amino acid ILs ([DBUH] 2 Cys) into the pore channels of sulfonic acid-based COF (TpPa-SO 3 H). [DBUH] 2 Cys@COF-3 efficiently catalyzed epichlorohydrin with a yield of 96.38 % without any solvent or co-catalyst under atmospheric CO 2 . Notably, larger sterically hindered epoxides were selectively blocked on the surface of [DBUH] 2 Cys@COF-3, enabling [DBUH] 2 Cys@COF-3 to act as a gatekeeper for selectively catalyzing small sterically hindered epoxides due to [DBUH] 2 Cys was distributed within the pore channels of [DBUH] 2 Cys@COF-3. Through DFT calculations, comprehensive understanding of the synergistic activation conferred of -COO - and [DBUH] + towards CO 2 and epoxides in [DBUH] 2 Cys@COF-3 and the ring-opening mechanism was clarified. This work presents a fresh outlook on the catalyst design by the facile acid-base neutralization method for efficiently catalyzing small-hindered epoxides under atmospheric CO 2 .
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Biotechnology Journal
·
2024
·Vol. 19
·期 3
·2300615
·
IF 3.2
Yifei Zhang,Wei Zhang,Guangzheng Ma,Binbin Nian,Yi Hu
Phytosterols usually have to be esterified to various phytosterol esters to avoid their disadvantages of unsatisfactory solubility and low bioavailability. The enzymatic synthesis of phytosterol esters in a solvent-free system has advantages in terms of environmental friendliness, sustainability, and selectivity. However, the limitation of the low stability and recyclability of the lipase in the solvent-free system, which often requires a relatively high temperature to induce the viscosity, also increased the industrial production cost. In this context, a low-cost material, namely diatomite, was employed as the support in the immobilization of Candida rugosa lipase (CRL) due to its multiple modification sites. The Fe 3 O 4 was also then introduced to this system for quick and simple separation via the magnetic field. Moreover, to further enhance the immobilization efficiency of diatomite, a modification strategy which involved the octadecyl and sulfonyl group for regulating the hydrophobicity and interaction between the support and lipase was successfully developed. The optimization of the ratio of the modifiers suggested that the -SO 3 H/C 18 (1:1.5) performed best with an enzyme loading and enzyme activity of 84.8 mg·g −1 and 54 U·g −1 , respectively. Compared with free CRL, the thermal and storage stability of CRL@OSMD was significantly improved, which lays the foundation for the catalytic synthesis of phytosterol esters in solvent-free systems. Fortunately, a yield of 95.0% was achieved after optimizing the reaction conditions, and a yield of 70.0% can still be maintained after six cycles.
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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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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhengwei Xu,Xiaohong Jiang
TiO 2 nano-porous arrays with appropriate structural parameters, roughness and wettability have application potential in implantable titanium-based (Ti-based) alloys. In this research, the polydopamine (PDA) and Arg-Gly-Asp (RGD) peptide are adopted to construct a favorable osteogenic microenvironment on the anodized TiO 2 nano-porous arrays before and after heat treatment. The characterization of surface morphologies and chemical compositions has been conducted to confirm the feasibility of the PDA-based modification and RGD peptide immobilization. Via immersion in the modified-simulated body fluid (m-SBF) for 7 days, the PDA-based modified samples have represented enhanced biomineralization performance. Moreover, the cell adhesion and proliferation assay, alkaline phosphatase (ALP) activity assay and quantitative real-time polymerase chain reaction (qRT-PCR) assay in vitro have indicated that the heat-treated TiO 2 nano-porous arrays modified with PDA and RGD peptide have endowed the seeded MC3T3-E1 mouse pre-osteoblasts with excellent osteogenic performance. Such modified TiO 2 nano-porous arrays have great latent capacity in implantable materials for biomineralization and osteogenesis.
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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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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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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Lijuan Wang,Xuanxuan Xin,Pengfei Li,Jie Dou,Xiao Han,Jian Shen,Jiang Yuan
Gold nanoparticles(AuNPs) are capable to catalyze the nitric oxide (NO) generation from endogenous and exogenous donors, thereby promoting re-endothelialization and inhibiting intimal hyperplasia and thrombosis. Herein, keratin-dopamine conjugates were synthesized and then immobilized on the surface of the pre-aminolyzed poly(ethylene terephthalate) (PET) via self-polymerization of dopamine residue, following by the formation of AuNPs in situ without extra reductant. The modified PET sheets(PET-AuNPs) could promote the growth of HUVECs while inhibit the proliferation of HUASMCs due to their catalytic generation of NO from GSNO. In addition, these sheets exhibited antibacterial properties and good blood compatibility without hemolysis. Taken together, this strategy for designing prosthetic vascular grafts to treat cardiovascular diseases has great potential.
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Catalysis Science & Technology
·
2017
·Vol. 7
·期 18
·4173-4181
·
IF 5.773
Yong Wang,Xin Guan,Fangyan Chen,Shuaishuai Zhu,Yunsheng Ye,Haiyan Peng,Xingping Zhou,Xiaolin Xie,Yiuwing Mai
The first examples of bifunctional hyperbranched polymers (HBP) with high density ionic liquid (IL) moieties in the main chain and controllable amount of pyrene groups at the chain ends (Py-HBPIL) have been synthesized via a facile three-step procedure, which were then immobilized onto reduced graphene oxide (rGO) via π–π stacking interactions. Py-HBPIL(Br) bearing pyrene groups at 10% of the chain ends allowed the highest immobilization loading of 73% in weight. The resultant Py-HBPIL(Br)@rGO hybrid material displayed much better catalytic activity than ever reported for immobilized IL catalysts for coupling reaction between CO2 and propylene oxide (PO), and it could be reused up to 6 times by simple filtration process without significant decline in activity. Furthermore, the combination of bifunctional HBP and π–π stacking immobilization may provide a general and versatile platform to design highly active, selective and recyclable catalysts for various chemical transformations.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2012
·
IF 3.07
Shengliu Wang,Kai Yue,Lianying Liu,Wantai Yang
When dispersion polymerization of styrene (St) had run for 3 h, after particle rapidly growing stage, 4,4′-dimethacryloyloxybenzophenone (DMABP) cross-linker was added to reaction system and photoreactive, core(PSt)–shell(Poly(St- co -DMABP)) particles with rich benzophenone (BP) groups on surface were prepared. Polymerization of DMABP could occurred mainly on the preformed core of PSt because its diffusion could be impeded by (1) compactness of particles formed at the moment of cross-linker addition (more than 80% of monomer had been consumed, particles were no longer fully swollen by monomer), (2) reduced polarity of continuous phase, and (3) immediate occurrence of cross-linking. Subsequently, photoreactive, cross-linked hollow particles were yielded by removal of uncross-linked core in THF. SEM and TEM observation demonstrated the formation of core–shell structure and improvement of shell thickness when DMABP content increased. UV–vis spectra analysis on polymer dissolved in THF indicated that there is no polymer of DMABP in core. FTIR spectra analysis and XPS measurement further revealed that BP component on particle surface was enriched when amount of DMABP increased. Finally, an anti-fouling polymer (poly (ethylene glycol), PEG) and protein of mouse IgG was immobilized on particle surface under UV irradiation, as confirmed by FTIR spectra analysis, SEM observation and TMB color reaction.
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