ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 14
·13813-13822
·
IF 2.8
Liu Tongzhou,Gu Yurong,Xing Ding Yu,Dong Wenyi,Wu Xiuwei
Adsorption is well accepted as an effective method for perfluorinated compounds’ (PFCs) removal from water among various conventional methods. However, development of adsorbents that combine good performance of PFC removal and regenerability has not yet been realized. This work demonstrated the fabrication and application of an ammoniated magnetic adsorbent for efficient and economical PFOS and PFOA removal. Functional ammonium groups and γ-Fe 2 O 3 were effectively incorporated in the particle with the proposed method. These fabricated magnetic particles presented superior adsorption performance for PFOS and PFOA with short equilibrium time of 120 min and high adsorption capacity. The isotherms revealed that the adsorption process belonged to multilayer sorption with their intricate interactions including anion exchange and hydrophobic interaction. The magnetic particle maintained its removal efficacy over a wide pH range of 3–9 or with coexisting substances. Moreover, the regeneration and reuse of the magnetic particle were successfully carried out with PFOS and PFOA removal efficiency sustained higher than 80% in 15 consecutive treatment cycles. Along with the efficient adsorption and easy separation of adsorbents, we expect that this ammoniated magnetic particle can serve as an excellent alternative for PFOS and PFOA removal from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Jiahong Lin,Qiujie Lai,Yingju Liu,Shi Chen,Xueyi Le,Xiaohua Zhou
Magnetically retrievable formulations of laccase potentially promising for biomedical and environmental applications were constructed by immobilization of the enzyme on the surface of magnetic nanoparticles functionalized by siloxane layers with active amino and methacrylyol moieties. The functional magnetic particles were prepared using a hydrolytic polycondensation reaction of tetraethoxysilane with 3-methacryloxypropyltrimethoxysilane (MPS). The results indicated that the amounts of laccase loading on the methacrylyol functional magnetic particles were approximately 150 mg/g under the optimum conditions. The stability of the immobilized laccase was highly enhanced against thermal treatments and provided better long-term storage. Compared to free laccase, the immobilized laccase exhibited significantly higher decolourisation efficiency in the decolorization of a representative dye, methyl red, which resulted from the magnetic particles adsorption and enzymatic catalysis. These results show its great potential for industrial applications.
研究领域:
生物技术
·
环境科学
·
医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Dong-Dong Zhou,Hao Zhang,Qian Zhang,Zheng-Ming Qian,Wen-Jia Li,Chun-Hong Li,Feng-Qing Yang,Hua Chen
In this study, a titanium ion (Ti 4+ ) functionalized polydopamine coated ferroferric oxide (Fe 3 O 4 @PDA@Ti 4+ ) core-shell magnetic particle was prepared for the selective extraction of nucleotides. Firstly, different metal ions including Ti 4+ , Zr 4+ , Fe 3+ , Al 3+ , Cu 2+ , Zn 2+ , Ni 2+ and Mg 2+ were respectively immobilized onto Fe 3 O 4 @PDA particles and their extraction efficiency for five nucleotides [cytidine-5′-monophosphate (CMP), uridine-5′-monophosphate (UMP), guanosine-5′-monophosphate (GMP), thymidine-5′-monophosphate (TMP) and adenosine-5′-monophosphate (AMP)] were compared. Among these prepared materials, Fe 3 O 4 @PDA@Ti 4+ , which exhibited the highest extraction efficiency for nucleotides, was further characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. After being optimized of the extraction parameters including adsorbent amounts, extraction time, extraction temperature, type and concentration of the eluent, the prepared Fe 3 O 4 @PDA@Ti 4+ magnetic particles were successfully applied for the selective extraction and determination of CMP, UMP, GMP, TMP and AMP in Cordyceps and Lentinus edodes . Good linearity (varying from 0.063 to 19.000 μg/mL, R 2 > 0.999) and low limit of detection (LODs) (ranging between 0.0047 and 0.0141 μg/mL) for target analytes were achieved. These results demonstrated that the synthesized material in this study had potential for selective extraction of phosphorylated small molecular compounds in complicated matrix.
研究领域:
生物化学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·
IF 1.992
Jin Xu,Xuejia Shi,Xiaomeng Zhang,Zhenzhong Wang,Wei Xiao,Linguo Zhao
To efficiently recycle GH78 thermostable rhamnosidase (TpeRha) and easily separate it from the reaction mixture and furtherly improve the enzyme properties, the magnetic particle Fe 3 O 4 -SiO 2 -NH 2 -Cellu-ZIF8 (FSNcZ8) was prepared by modifying Fe 3 O 4 -NH 2 with tetraethyl silicate (TEOS), microcrystalline cellulose and zinc nitrate hexahydrate. FSNcZ8 displayed better magnetic stability and higher-temperature stability than unmodified Fe 3 O 4 -NH 2 (FN), and it was used to adsorb and immobilize TpeRha from Thermotoga petrophilea 13995. As for properties, FSNcZ8-TpeRha showed optimal reaction temperature and pH of 90°C and 5.0, while its highest activity approached 714 U/g. In addition, FSNcZ8-TpeRha had better higher-temperature stability than FN. After incubation at 80°C for 3 h, the residual enzyme activities of FSNcZ8-TpeRha, FN-TpeRha and free enzyme were 93.5%, 63.32%, and 62.77%, respectively. The organic solvent tolerance and the monosaccharides tolerance of FSNcZ8-TpeRha, compared with free TpeRha, were greatly improved. Using naringin (1 mmol/l) as the substrate, the optimal conversion conditions were as follows: FSNcZ8-TpeRha concentration was 6 U/ml; induction temperature was 80°C; the pH was 5.5; induction time was 30 min, and the yield of products was the same as free enzyme. After repeating the reaction 10 times, the conversion of naringin remained above 80%, showing great improvement of the catalytic efficiency and repeated utilization of the immobilized α-L-rhamnosidase.
研究领域:
生物化学
·
酶工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2015
·Vol. 88
·期 3
·529-532
·
IF 0.276
Shang Hongzhou,Zhang Xin,Zhao Jingdong,Liang Hongyu
Firstly, micro-particles Fe 3 O 4 /SiO 2 were prepared by sol-gel method, with nano-Fe 3 O 4 and tetraethoxysilane (TEOS) as original materials. Secondly, γ-aminoproplytriethoxysilane (KH-550) was used as couple agent to deal with the surface of micro-particles Fe 3 O 4 /SiO 2 , therefore amine was introduced to the surface of micro-particles Fe 3 O 4 /SiO 2 /KH-550. Finally, acrylamide (AM) and methyl methacrylic acid (MMA) as the functional comonomers, were grafted on the surface of micro-particles Fe 3 O 4 /SiO 2 /KH-550. The structures and properties of the magnetic particles were characterized by the fourier transform infrared spectroscopy (FTIR), X-ray diffraction analyzer (XRD), laser particle size analyzer, and vibrating sample magnetometer (VSM). The results shows that the characteristic peaks of Si-O-Si, KH-550, and P (AM-MMA) all were displayed in the infrared spectra, respectively. Surface modification of nano-particle Fe 3 O 4 does not affect its crystalline structure, and the grafting copolymers P (AM-MMA) were a crystalline polymer. The median diameter of Fe 3 O 4 /SiO 2 /KH-550/P (AM-MMA) is 72.46 um, whose size is larger than particles Fe 3 O 4 and Fe 3 O 4 /SiO 2 . Fe 3 O 4 and its derivatives remain super-paramagnetism, and the saturation magnetization reduced with the increasing the thickness of the modifying material on the surface of Fe 3 O 4 .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yahui Zhang,Xiaoyan Lin,Quisheng Zhou,Xuegang Luo
The magnetic core-shell Fe 3 O 4 @Alg-La particles were fabricated successfully by a simple method of electro-coextrusion, and employed as an adsorbent for separation of fluoride from aqueous solution. Main factors affecting the removal of fluoride, including pH, adsorbent dosage, initial concentration, temperature and contact time were investigated. The adsorption isotherm and adsorption kinetics were studied to understand the adsorption process in detail. The experimental data were fitted well by the non-linear Freundlich isotherm and linear pseudo-second-order model, the maximum fluoride adsorption capacity was 45.230 mg/g at pH 4, 298.15 K. Thermodynamic parameters indicated that the fluoride adsorption process was feasible and spontaneous. The presence of other anions like Cl − , SO 4 2− , HCO 3 − and PO 4 3− had almost no effect on the fluoride adsorption. The adsorbent can be easily separated from the solution by a magnet. The magnetic core-shell Fe 3 O 4 @Alg-La particles before and after fluoride adsorption were studied by SEM, FTIR, EDX and XPS, which indicated that the adsorption mechanism may be related to electrostatic attraction and Lewis acid-base interaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 16
·6765-6777
·
IF 3.5
Li Yichao,Sun Ao,Hu Xiafen,Wu Dan,Hao Lei,Yan Youwei,Xi Zhaojun
Out-of-oven curing of epoxy resins with economical and energy-efficient techniques is vital for manufacturing advanced composite structures. In this study, the effects of a magnetic particle (MP)-induced in situ heating technique on the heating temperatures and mechanical properties of epoxy resins were investigated. The results showed that the proposed technique quickly increased the epoxy resin temperature and steadily heated the polymer until it was fully cured. With increasing MP concentrations from 6 wt% to 22 wt%, a notable increase in the heating ratio from 3.27 °C/min to 8.96 °C/min and steady increases in the heating temperature from 92.61 °C to 115.03 °C were observed. Surface modification of the MPs improved the homogeneity of the heating field and cross-linking and also increased the heating ratio and steady heating temperature. With merely 2.5 h of induction heating, the flexural moduli and strengths of functionalized MP/epoxy samples with MP loads of 6 wt%, 13 wt% and 22 wt% were 45.1%, 42.8%, 40.5% and 6.3%, 33.5%, 39.4% higher than those of oven-cured control samples. These findings provide essential knowledge for fabricating advanced polymeric composite structures without an oven.
研究领域:
材料科学
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复合材料
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Yi Wu,Guilin Xu,Tong Wang,Ke Liu,Jing Lu,Dong Wang
Superamphiphobic coatings have been widely used in self-cleaning and antifouling materials because of their unique liquid repellency. In this study, magnetic Fe 3 O 4 particles and resin were sprayed to construct hierarchical scales of texture, and 1H,1H,2H,2H-perfluorodecyltriethoxysilane was used to reduce surface free energy , and a biomimetic hair-like composite coating was prepared. The microstructure and chemical composition of the coating was characterized by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Both aqueous and oily liquid droplets can retain a perfectly quasispherical shape on the coating surface . The biomimetic hair-like composite coating exhibited superior water-collecting and superamphiphobic properties as well stable resistance against severe temperature, concentrated acidic, alkaline solutions and mechanical damages. This design strategy may provide useful guidelines for the fabrication of large-scale regular superamphiphobic surfaces.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Jia-Li Gu,Hong-Fei Tong,Dong-Qiang Lin
Magnetic particles modified with 5-amino-benzimidazole (ABI), a ligand for hydrophobic charge-induction chromatography, were prepared and used for antibody capture. In this study, with IgG as the model target, and bovine serum albumin (BSA) as the model impurity, the separation mechanism and process of IgG was investigated. The adsorption isotherms of IgG and BSA were measured, and the effects of pH were investigated in the range of pH 4.0–8.0. The maximum adsorption capacity of IgG on the particles was 180 mg/ml at pH 7.0, while low adsorption capacity of BSA (64 mg/ml) was found at pH 7.0, resulting in good selectivity. The protein-ligand interactions were elucidated by adding NaCl and glycerol. The results indicated the hydrophobic interactions were the main forces for IgG-ligand association. Moreover, the batch uptake and desorption experiments demonstrated the fast adsorption and desorption processes for IgG separation. The purity of IgG separated from mimetic serum could reach 98.6%, and the purity of monoclonal antibody (mAb) from a cell culture supernatant was 97.1%. Magnetic particles with hydrophobic charge-induction ligands showed a robust performance and could purify antibody directly from the complicated feedstock without clarification, which would improve the efficiency of antibody purification.
研究领域:
生物化学
·
蛋白质纯化
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Ying Chen,Fengyuan Zhang,Xiaoshuang Shi,Mingyi Lu,Kang Qin,Quan Feng,Rongbo Guo
This paper aims to improve the biological nitrogen removal performance by using magnetic polystyrene composite microparticles (PS@Fe 3 O 4 ). Three types of PS@Fe 3 O 4 with different surface morphologies were prepared by in-situ emulsion polymerization . Then, the optimum was creatively used as a biofilm carrier to form magnetic activated sludge (MAS) in lab-scale reactors. Compared to the conventional activated sludge , the utilization of PS@Fe 3 O 4 accelerated the sludge settling velocity to 0.76 m/h. In addition, the ammonium nitrogen removal, total nitrogen removal and simultaneous nitrification and denitrification improved by 7.08%, 24.27% and 19.53%, respectively. The dissolved oxygen concentration and pH were observed to reveal the effect of PS@Fe 3 O 4 on the nitrogen removal process. Based on microbial community analysis, there were more nitrifying and denitrifying bacteria in the MAS. Therefore, the novel developed PS@Fe 3 O 4 can be a promising utilization material as a biofilm carrier for biological wastewater treatment .
研究领域:
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Renpeng Yang,Xiaogang Yu,Chengxiong Wei,Chengwei Wu,Wei Zhang
The poor photothermal performance of Fe 3 O 4 magnetic particles under 808 nm near-infrared laser inevitably limits their application in the field of photothermal therapy for tumor. Herein, Fe 3 O 4 clusters with a mean size of 239.1 nm were synthesized by solvothermal method and thermal treatment at 400℃. Compared with the reported Fe 3 O 4 materials, the developed clusters exhibit high extinction coefficient of 7.88 L/(g∙cm) and the highest photothermal conversion efficiency of 51.1 %, for which thermal treatment plays a key role. Due to the introduction of thermal treatment, the increased grain size and decreased grain distance can enhance the Fe 3+ magnetic coupling and thus improve the extinction ability, while the defects caused by high temperature can trigger more electron traps to promote electron non-radiative relaxation and translate into more thermal energy. The measurements of coercivity (10.6 Oe to 67.3 Oe), blocking temperature (382.3 K to over 400 K) and Urbach energy (0.461 eV to 0.692 eV) before and after thermal treatment support this explanation. The in vitro and in vivo photothermal experiments show that the Fe 3 O 4 clusters can kill tumor cells and inhibit tumor growth through the conversion of laser energy into thermal energy.
研究领域:
材料科学
·
医学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Jing Liang,Ke Min,Piao Long,Xuqian Weng,Qun Huang,Bo Chen,Ming Ma
Ce-doped Fe 3 O 4 magnetic particles (Ce-Fe 3 O 4 MPs) were synthesized by co-precipitation method. The coordination and adsorption properties of Ce-Fe 3 O 4 MPs to different natural products were investigated. The results verified that the “catechol-like”,“maltol-like” and “acetylacetone-like” donor sets of flavonoids were the binding sites with Ce-Fe 3 O 4 MPs. The adsorption was conformed to be pseudo-second-order model and single-layer adsorption after being characterized by adsorption kinetics and adsorption thermodynamics. The adsorption and desorption conditions were optimized. It was found that different components adsorbed on the Ce-Fe 3 O 4 MPs surface can be selective desorbed in different solvents, which was helpful for the selective separation to adsorbed components. The Ce-Fe 3 O 4 MPs were successfully applied to selective adsorption of compounds containing “catechol-like”, “maltol-like” and “acetylacetone-like” donor sets in the crude extract of Scutellaria baicalensis Georgi and Rheum palmatum L . The results demonstrated that the magnetic solid phase extraction (MSPE) method based on Ce-Fe 3 O 4 MPs has the advantages of high structural selectivity, high efficiency and low consumption, and can be used for efficient separation of flavonoids with specific structures from natural products.
研究领域:
植物化学
·
药物化学
·
分离科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）