Journal of Cleaner Production
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2023
·
IF 11.1
Jiayi Li,Weixing Han,Heyao Liu,Minhua Su,Diyun Chen,Gang Song
The development and use of clean energy produced by nuclear power plants is becoming a major international trend, but it will inevitably lead to the problem of radionuclide pollution. Radioactive nuclear wastewater containing Cs and U and produced as a byproduct of coastal nuclear power production can cause substantial environmental pollution . In order to simultaneously remove radioactive cesium and uranium, polydopamine (PDA) inlaid ammonium phosphomolybdate (AMP) has established a hydrophilic functional structural film on the surface of Fe 3 O 4 , forming AMP@PDA@Fe 3 O 4 (APF) which is used to simultaneous remove Cs(I) and U(VI). Using the pH sensitive range of APF adsorption in the process of adsorbing Cs(I) and U(VI), synergistic adsorption can be achieved under the condition of weak acidity to neutral. The effects of temperature, and common cations on Cs(I) and U(VI) adsorption by APF were investigated, the adsorption was found to be sensitive to the presence of K + . The efficiency of Cs(I) and U(VI) adsorption by APF was 99.88% and 98.39%, respectively. The Cs(I) adsorption process was primarily ion exchange with NH 4 + within APF composite, whereas that for U(VI) was primarily C-O complexation. Both the Cs(I) and U(VI) adsorption reactions were consistent with second-order kinetic and Langmuir isothermal adsorption models. After five cycles of experiments the removal efficiency of Cs(I) and U(VI) can reach 64.88% and 79.81%, respectively. APF was also found to have high selectivity for Cs and U in seawater with high salt content at pH 6.0–7.0. In mimic contaminated seawater, the efficiency of Cs(I) and U(VI) removal was 97.65% and 84.63%, respectively. These findings provide references for the remove of Cs(I) and U(VI) from radioactive wastewater , making the process of energy production safer.
研究领域:
环境科学
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材料科学
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核能工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Jiumei Chu,Debin Wang,Xue Yang,Mengyu Lin,Dianquan Dong
In the previous work, our research group adopted sol-gel technology to incorporate trace Zn 2+ into the Ti–O lattice of Cs 2 Ti 6 O 13 to improve the cell structure and prepared zinc-doped titanate precursor material (CZnTO). This precursor is acid-treated to form a zinc-doped protonated titanate (HZnTO). Based on previous studies in our research group, this paper proposed a membrane support and creating technology for preparing powdered zinc-doped titanium-based cesium ion sieves. It made a batch adsorption test to explore the adsorption performance of Cs + . The main research contents are as follows: A phase transition synthesis method is used to composite PVDF material with powdered ion sieve HZnTO to form a microporous hydrophobic polymer membrane HZnTO@PVDF. The higher the pH in the solution, the greater its saturated adsorption capacity. The composite membrane maintains good stability in both acidic and alkaline solutions. Compared with the powdered ion sieves, HZnTO@PVDF the adsorption rate is significantly faster, reaching saturated adsorption capacity in about 2 h in 3000 mg/L Cs + solution. HZnTO @ PVDF has good cyclic adsorption stability, maintaining 90.33 % of the initial adsorption capacity after five adsorption-desorption cycles. Moreover, after 5 cycles, the composite membrane still maintained the integrity of its original structure.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2021
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IF 5.161
Jinhe Dou,Jing Wang,Yupeng Lu,Chuanzhong Chen,Huijun Yu,Robin Lok-Wang Ma
MAO/CS composite coatings were generated on Mg-1.75Zn-0.56Ca alloy surface for protection and improving biocompatibility of Mg -Zn- Ca alloy in the physiological environment. The microstructure, surface analysis and corrosion resistance of samples were evaluated by scanning electronic microcopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in SBF solution. In addition, in vitro cell cytotoxicity test was performed by MTT tests. The findings of this work indicated that MAO/CS composite coatings were smooth and defect-free. The MAO/CS coatings retained a low degradation rate and the solution pH value at a moderate level (≤7.5) during immersion test. The corrosion resistance and cell proliferation were greatly enhanced by the composite coating. Furthermore, the different cell cytotoxicity on Mg alloy, MAO and MAO/CS coating was discussed.
研究领域:
生物材料
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医学工程
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腐蚀科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
·Vol. 99
·期 7
·1637-1645
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IF 2.8
Wei Wu,Xiaoqian Ma,Rui Wang,Dayong Zhang
BACKGROUND Demulsification using chitosan (CS)-coated magnetic nanomaterials has garnered significant attention. However, traditional methods for synthesizing chitosan (CS)-coated magnetic nanomaterials are often contaminated, laborious, and time-consuming. Moreover, they showed poor demulsification efficiency due to the occupation of free amino groups in CS by crosslinking agents. RESULTS CS-coated Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized using humic acid (HA) as a bridge. The Fe 3 O 4 /HA/CS MNPs are recyclable demulsifiers for hexadecane-water microemulsions. The impacts of MNP dosage, separation time, and pH on demulsification efficiency were studied comprehensively. Compared with Fe 3 O 4 /HA and Fe 3 O 4 /CS MNPs, the demulsification efficiency of the Fe 3 O 4 /HA/CS MNPs was superior. The pseudo-second-order kinetic model and the Sips isotherm best describe the demulsification process. Combined with the influence factors of demulsification efficiency, the demulsification mechanism involves electrostatic interactions between MNPs and oil microparticles. The maximum adsorption capacity for oil by the Fe 3 O 4 /HA/CS MNPs was 91.73 mg g −1 . CONCLUSION This research presents a new method for connecting CS to MNPs with a high surface positive charge. As synthesized Fe 3 O 4 /HA/CS MNPs is expected to serve as highly efficient and recyclable demulsifiers for emulsified oil wastewater. © 2024 Society of Chemical Industry (SCI).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Chinese Physics B
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2018
·Vol. 27
·期 2
·027805
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IF 1.321
Meng Du,Xing-Zhong Cao,Rui Xia,Zhong-Po Zhou,Shuo-Xue Jin,Bao-Yi Wang
The CS/PVA/Fe3O4 nanocomposite membranes with chainlike arrangement of Fe3O4 nanoparticles are prepared by a magnetic-field-assisted solution casting method. The aim of this work is to investigate the relationship between the microstructure of the magnetic anisotropic CS/PVA/Fe3O4 membrane and the evolved macroscopic physicochemical property. With the same doping content, the relative crystallinity of CS/PVA/Fe3O4-M is lower than that of CS/PVA/Fe3O4. The Fourier transform infrared spectroscopy (FT-TR) measurements indicate that there is no chemical bonding between polymer molecule and Fe3O4 nanoparticle. The Fe3O4 nanoparticles in CS/PVA/Fe3O4 and CS/PVA/Fe3O4-M are wrapped by the chains of CS/PVA, which is also confirmed by scanning electron microscopy (SEM) and x-ray diffraction (XRD) analysis. The saturation magnetization value of CS/PVA/Fe3O4-M obviously increases compared with that of non-magnetic aligned membrane, meanwhile the transmittance decreases in the UV-visible region. The o-Ps lifetime distribution provides information about the free-volume nanoholes present in the amorphous region. It is suggested that the microstructure of CS/PVA/Fe3O4 membrane can be modified in its curing process under a magnetic field, which could affect the magnetic properties and the transmittance of nanocomposite membrane. In brief, a full understanding of the relationship between the microstructure and the macroscopic property of CS/PVA/Fe3O4 nanocomposite plays a vital role in exploring and designing the novel multifunctional materials.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fan Wang,Lijuan Zhang,Yeying Wang,Xijian Liu,Sohrab Rohani,Jie Lu
The graphene oxide (GO) functionalized by Fe 3 O 4 @SiO 2 @CS-TETA nanoparticles, Fe 3 O 4 @SiO 2 @CS-TETA-GO, was firstly fabricated in a mild way as a novel adsorbent for the removal of Cu(II) ions and methylene blue (MB) from aqueous solutions. The magnetic composites showed a good dispersity in water and can be conveniently collected for reuse through magnetic separation due to its excellent magnetism. When the Fe 3 O 4 @SiO 2 @CS- TETA-GO was used as an absorbent for the absorption of MB and Cu(II), the adsorption kinetics and isotherms data well fitted the pseudo-second-order model and the Langmuir model, respectively. Under the optimized pH and initial concentration, the maximum adsorption capacity was about 529.1 mg g −1 for MB in 20 min and 324.7 mg g −1 for Cu(II) in 16 min, respectively, exhibiting a better adsorption performance than other GO-based adsorbents reported recently. More importantly, the synthesized adsorbent could be effectively regenerated and repeatedly utilized without significant capacity loss after six times cycles. All the results demonstrated that Fe 3 O 4 @SiO 2 @CS-TETA-GO could be used as an excellent adsorbent for the adsorption of Cu(II) and MB in many fields.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Bioengineered
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2022
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IF 6.832
Wei-Hao Wu,Xiao-Mei Ma,Jian-Qing Huang,Qin Lai,Fu-Neng Jiang,Cui-Yun Zou,Long-Tian Chen,Lian Yu
This study investigated whether CRISPR/Cas9 (D10A) nickase-mediated gene editing can correct the aberrant Hb Constant Spring mutation (Hb CS or HBA2: c.427 T > C) in fibroblasts. Vectors for repairing the α-globin-encoding gene, HBA2:c.427 T > C mutation, includingthe CRISPR/Cas9(D10A)-sg plasmid and donor with homology arms, were constructed and used to perform gene editing in patient-derived fibroblasts. We subsequently analyzed the genetic correction, the gene editing efficiency and off-target effect. Sequencing analysis and the BamHI assay showed that HB CS mutant cells were repaired with Hb CS point mutations, the editing efficiency was 4.18%~9.34% and no off-target effects were detected. The results indicate that the HB CS mutant gene is effectively repaired by the CRISPR/Cas9 (D10A)system, which may enable truly personalized therapy for precise repair of α-thalassemia.
研究领域:
分子生物学
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遗传学
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医学
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产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
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2021
·Vol. 23
·期 2
·343-351
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IF 2.153
Zhang Ruquan,Lei Min,Hu Bingyu,Tu Hu,Hu Min
A preparation method of compound foam dressing with antibacterial effect is introduced in this paper. Garlic oil, a natural antibacterial agent was coated with β-CD to form the garlic oil/β-CD microcapsule (MC). Then the microcapsule was added to the spinning solution with polyvinyl alcohol (PVA) and chitosan (CS) and was spun onto foam dressing to prepare garlic oil/CS/PVA nanofiber/foam compound dressings. The addition of garlic oil/β-CD microcapsule endowed the compound foam dressing with good antibacterial properties. The results shown that with the increase of MC, the antibacterial activity of compound dressing was further increased. MC 1.6 displayed the best antibacterial ability against E. coli and S. aureus (67.28 and 69.15 %), respectively. The liquid absorption properties increased from 16.86% to 17.91 % and the moisture content increased from 3.26 % to 5.29 %, compared to that of foam dressings. The mechanical properties of garlic oil/CS/PVA nanofiber/foam compound dressings increased by 4.6 N mm −2 compared with the foam compound dressings, and the elongation at break increased by about 11.3 %.
研究领域:
材料科学
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生物医学工程
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微生物学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
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2024
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IF 2.2
Yuejin Liu,Xiaojun Niu,Dongqing Zhang,Lingling Zhou,Chunyang Tao,Yu Lin,Siping Chen,Yawen Chen,Zhang Lin,Suying Kong
Flocculation is one of the most significant conditioning methods for sludge dewatering. In the study, a novel flocculant CS–TA, prepared through free radical-mediated conjugation of tannic acid (TA) and chitosan (CS), was proposed to improve sludge dewatering. The characterisation using Fourier transform infra-red spectroscopy and X-ray diffraction analysis shows that the CS chain was the backbone of CS–TA, and the presence of CS–TA aromatic rings confirmed the conjugation of CS with TA. Moreover, the conditioning of CS–TA yielded the best dewatering performance at 30 mg g TS−1 with the water content of sludge cake by press filtration (Wsc) of 59.78% ± 0.3% and capillary suction time (CST) of 11.8s ± 0.35 s, compared to 98.2% ± 0.15% and 56.2 s ± 0.16 in raw sludge. The results of different influencing factors (e.g. pH and temperature) on flocculation efficiency indicated that CS–TA possessed the capacity for enhancing sludge dewaterability over a wide range of pH, and the optimal temperature was observed to be 35 °C. Furthermore, the increase of particle size and zeta potential implied the addition of CS–TA favoured the formation of larger particles charge neutralisation and adsorption bridging effect. In addition, extracellular polymer substances (EPS) analysis indicated that the decrease in the polysaccharide and protein contents in EPS after CS–TA addition could increase the relative hydrophobicity of sludge. Moreover, the contents of heavy metals in sludge and their leaching toxicity and environmental risk were reduced. This study provides comprehensive insights into the exploration of CS–TA for sludge dewatering and the maintenance of ecological security in an eco-friendly.
研究领域:
环境科学
·
污水处理
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Jie Xu,Guangyong Zeng,Qingquan Lin,Yi Gu,Xuelian Wang,Zhenhua Feng,Arijit Sengupta
Due to the presence of several hydroxyl and amino groups on the surface, chitosan (CS) has been reported to be a potential candidate to solve the pollution caused by dyes in different industrial wastewater. However, it is associated with the recycling issues. Nano-Fe 3 O 4 has the advantages of easy magnetic separation and surface functionalization, which can improve the efficiency as well as selectivity of separation. However, its tendency for agglomeration can reduce the adsorption capacity. MXene can provide suitable support for both CS and Fe 3 O 4 to construct new MXene@Fe 3 O 4 @CS composites. In this study, MXene@Fe 3 O 4 @CSmagnetic nanosphere was synthesized by ultrasonic self-assembly to remove Congo red (CR). Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier Transform Infrared (FT-IR) spectroscopy were employed to characterize the nanocomposites. According to the batch experiments, the adsorption kinetics were found to predominantly follow quasi-secondary rate kinetics. The adsorption followed Langmuir isotherm model. The adsorption process was found to be endothermic, entropy-driven, and thermodynamically spontaneous process. The adsorption capacity for CR was estimated as 620.22 mg·g −1 .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Zhiguo Chen,Wenqing Cao,Yan Li,Jingpeng Song,Yiyun Liu,Juncheng Liu,Rong Zhang,Rongxin Su,He Bai
The remediation of the chlorinated organic compounds via zero-valent iron (ZVI) and microorganisms coupling method in the groundwater has received increasing attention and research. However, the addition of external microorganisms has poor adaptability in complex environmental applications, and ZVI is easily inactivated and has weak long-term degradation performance in the environment. The existing modification preparation of ZVI modified materials seem relatively lacking economical and environmentally friendly methods. This study obtained a new type of highly efficient degradation bacterium BL5, and introduced an economical and simple method for preparing the functional CS@ZVI biological stimulation materials. The performances of CS@ZVI-BL5 systems for the removal of TCE, chloroform , 1,2-dichloroethane, and chlorobenzene were all reached 100 % after 12 days, which was significantly improved the degradation efficiency by the CS@ZVI or BL5 (95.65 %, 93.64 %, 90.54 %, 88.85 %) alone. This is the first method that extracted and screened an autochthonous high-efficiency degrading bacterium from contaminated sites, and developed a biological stimulation material to improve the remediation. Here we demonstrate that the modified CS@ZVI with BL5 microorganisms synergistically enhanced the degradation performance.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yi Ma,Jingan Li,Yifan Zhou
Magnesium alloys have become the focus of attention as a new generation of vascular stent materials due to their excellent mechanical properties and degradability. However, their rapid degradation rate and poor surface endothelialization performance have become key factors limiting their clinical application. In this study, the Mg-Zn-Y-Nd (ZE21B) surface was modified with the magnesium fluoride (MgF 2 ) corrosion-resistant layer, and the polydopamine (PDA) layer was used to immobilize the chitosan (CS)-ferulic acid (FA)/vanillic acid (VA) bioactive composite coating. The results of the electrochemical and hydrogen evolution experiments showed that the corrosion current density and hydrogen release of the modified ZE21B alloy significantly decreased, and its corrosion resistance was enhanced; the results of the hemolysis rate and whole blood experiments showed that the adhesion of blood components such as white blood cells and platelets on the surface of the modified ZE21B alloy significantly decreased, improving the blood compatibility of the magnesium alloy; the results of in vitro cell experiments showed that the modified ZE21B alloy effectively promoted endothelial cell (ECs) adhesion and proliferation, and inhibited smooth muscle cell (SMCs) pathological proliferation. These enhancements suggest that the CS-FA/VA coating significantly improves both the corrosion resistance and biological compatibility of the ZE21B alloy.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）