ENVIRONMENTAL TECHNOLOGY
·
2024
·
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
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Xinyue Chen,Dan Liu,Sanhu Gou,Jiahui Ji,Zhiyuan Xue,Shilan Feng
A colorimetric assay based on the oriented TA-AuNPs-PEG-FITC for rapid and sensitive PABA detection was proposed. Initially, the negatively charged TA modified on the surface of AuNPs enabled rapid binding to PABA due to the electrostatic interaction and hydrogen bond, resulting in a visible color change. However, particles were aggregated in a non-oriented way, leading to an unstable testing system which failed to realize the accurate quantification. Thus, the asymmetrically functionalized TA-AuNPs-PEG-FITC were prepared, in which the stabilizer agent of HS-PEG-FITC was attached to the specific sites on the surface of TA-AuNPs. Such a way of modification resulted in an oriented aggregation manner, the addition of PABA induced the formation of oligomers. Moreover, the introduction of FITC group acted as fluorescent marker, providing a simple, fast and quantitative method for characterization of PEG chain. The molar ratio between TA-AuNPs and modified PEG-FITC was further determined. A linear regression was established in a wide range from 10 μM to 1 mM with the LOD of 6.9 μM. Finally, the sensor was successfully applied in the health food. This was the first example in which TA-AuNPs-PEG-FITC were fabricated for colorimetric detection of PABA, and an indirect method based on fluorescence marker was well used to quantify the content of PEG chain.
研究领域:
分析化学
·
纳米生物学
·
食品科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiaqi He,Li Chen,Jinming Huang,Mingwei Li,Ju Zhou,Yihua Yue,Jiao Han,Yiming Zeng
This study investigates the dielectric properties of Sr 0.985 Lu 0.01 Ti 1- x Ta x O 3 ceramics co-doped with Lu and Ta as dual-donor, which were prepared using a solid-state method and sintered in a nitrogen atmosphere. The XRD results demonstrate that the dual-donor doping of Lu and Ta at Sr and Ti sites, respectively, which will improve the dielectric properties. The optimal dielectric properties were observed when x = 0.01, which the permittivity reaching approximately 220,000 and the dielectric loss is around 0.02. Through XPS and defect chemical analysis, it has been identified that the formation of point defects including , , and Ti 3+ will be produced by sintering in N 2 -atmosphere and the dual-donor doped of Lu 3+ and Ta 5+ . These point defects aggregate into dipole clusters, such as Ti 3+ Ti 3+ , and Ti 3+ , resulting in enhanced EPDD effect and reduced dielectric loss. This work provides valuable insights into the design of advanced dielectric materials with colossal permittivity.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 5
·1-15
·
IF 2.7
Qian Qian,Bao Shuxiang,Xia Juan,Lu Wangyang,Li Nan
Conductive hydrogel flexible sensors have attracted widespread attention in the field of wearable electronic devices, which typically possess the properties of stretch resistance, moisture retention, antifreeze, adhesion, and self-healing. Herein, a silk nanofiber–tannic acid (SNF@TA) is successfully introduced into a polyvinyl alcohol (PVA) hydrogel to prepare a rigid and adhesive PVA–SNF@TA organohydrogel, exhibiting good mechanical strength (up to 365 kPa) and excellent self-healing properties. Due to the presence of conductive ions and ethylene glycol, the PVA–SNF@TA organohydrogel presents high sensitivity and cold resistance (− 18 °C). Moreover, the PVA–SNF@TA organohydrogel maintains a good transparency of 91% and ultraviolet filtration capacity. A strain sensor made of PVA–SNF@TA organohydrogel has good adhesion and accurate sensing signals. Generally, the designed sensor can significantly monitor small deformations, such as frowning, blinking, smiling, and swallowing motions, showing an impressive sensitivity (gauge factor 1.094) and stable (1000 stretching cycles) variable sensing characteristics. More specifically, a pressure sensor consisted of a PVA–SNF@TA organohydrogel cylinder keeps good sensing stability, thereby desirably detecting different large movements of the human body (finger pressing, walking and running). Our work can offer a broad avenue for the advanced architecture of functional hydrogel materials, which has great potential in the field of human exercise and health monitoring. Graphical abstract
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhihao Liang,Rongxia Huang,Tianbao Xie,Yi Zhang,Hua-Tay Lin,Yejing Dai
Bi 4 Ti 3- x (Mn 1/3 Ta 2/3 ) x O 12 piezoelectric ceramics were prepared by conventional sintering and direct-reaction sintering in this study. The effect of B-site Mn/Ta co-substitution and sintering method on the microstructure and electrical properties of Bi 4 Ti 3- x (Mn 1/3 Ta 2/3 ) x O 12 piezoelectric ceramics was systematically investigated. The experimental results show that the combination of high-valent Ta and low-valent Mn ions replacing Ti 4+ ions reduce the concentration of oxide vacancy defects in BITMT ceramics. The direct-reaction sintering is a simpler preparation method and the prepared samples have more uniform grain distribution and higher density. The resistivity of the direct reaction sintered sample with x = 0.05 at 500 °C is 7.19 × 10 5 Ωcm, the residual polarization is 8.1 μC/cm 2 , and the temperature stability of the piezoelectric constant is good. Therefore, the present study suggests that the piezoelectric properties of Mn and Ta co-doping of BIT ceramics could be greatly enhanced via the direct-reaction sintering, which provides a promising alternative to the conventionally sintered for a more cost-effective preparation for BIT ceramics.
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2018
·Vol. 43
·期 7
·637-641
·
IF 1.749
Naimeng Song,Jianchao Liu,Guoying Zhang,Zhenzhan Yan,Hongxu Gao,Li Yang
This paper describes the preparation of two combustion catalysts Tannin-Fe (Ta−Fe) and Phloroglucinol-Fe (Ph−Fe) by spray drying. The particle size and morphology of the particles are observed by scanning electron microscopy (SEM). The results of SEM image show that the particles are regular spherical and very good dispersion. The diameter of most spherical particles is about 1 μm. The effects of Ta−Fe and Ph−Fe on the thermal decomposition of RDX and AP were tested by differential scanning calorimeter (DSC). DSC dates show that Ta−Fe and Ph−Fe can advance the high temperature exothermic peak of AP 18.0 °C and 16.1 °C, respectively. The burning rates illustrates that both Ta−Fe and Ph−Fe can significantly increase the combustion rate of HTPB propellants. The formulation with 2 mass% Ta−Fe shows an average 21.31 % increase in burning rate and has a low value of the exponent n=0.48. The formulation with 2 mass%Ph−Fe has a burning rate 20 to 60 % larger than that of the initial AP/HTPB/Al formulation, and has a lowest exponent n=0.45.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lin Li,Jiawei Zhao,Shaohua Luo,Pengyue Xing,Xinglong Teng,Zhenzhu Cao,Guorong Li
Materials with colossal permittivity (CP) have been extensively investigated for their promising applications in energy storage devices. In this work, the composition, microstructure and dielectric properties of (Na 0.25 Ta 0.75 ) x Ti 1–x O 2 (x = 0–0.04) ceramics were systematically investigated. Co-doped TiO 2 ceramics demonstrated giant dielectric constants. The optimized dielectric properties were achieved in (Na 0.25 Ta 0.75 ) 0.02 Ti 0.98 O 2 with high dielectric constant (7.32 × 10 4 ) and low loss (0.034) at 1 kHz. The origin of CP was explored by dielectric, complex impedance spectroscopy and X-ray photoelectron spectroscopy measurements. The giant dielectric constant primarily stems from the electronic pinning defect dipole effect and the internal barrier layer capacitance effect. This finding might shed light on the design of high-performance giant dielectric materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Gui-E Chen,Sheng-Nan Zhao,Yi-Ni Shi,Zhen-Liang Xu,Jing Ye
In the realm of wastewater treatment, the removal of grease and the control of microbial reproduction are crucial links. However, the design of a sustainable membrane with high oil filtration efficiency, high water permeability, excellent separation capacity and strong antibacterial function is still a problem that continues to challenge the researchers. In this work, Tannic acid (TA) and polyethylenediamine (PEI) were used as hydrophilic modifiers to combine with dendritic mesoporous silica (DMSN) to prepare a new type of nanocomposite particles (TA-PEI@DMSN). Using glutaraldehyde (GA) as a coupling agent, TA-PEI@DMSN nanoparticles were coated on the surface of polyvinylidene fluoride (PVDF) membrane, and a modified membrane (TA-PEI@DMSN/PVDF) was developed, which was both super-hydrophilic and super-oleophobic underwater conditions. The TA-PEI@DMSN/PVDF membrane can effectively intercept oily substances such as cyclohexane, n-heptane, petroleum ether and n-hexane, achieving an oil rejection rate up to 99.1% for heptane. The modified membrane exhibits superhydrophilicity (CA≈0°) and underwater oil resistance, excellent anti-fouling performance and robust stability. Otherwise, we noticed that the positive charge characteristic of the TA-PEI surface imparts the TA-PEI@DMSN/PVDF membrane with more 99.97% antibacterial activities against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The molecular simulation results show that the wettability and hydrophilicity are significantly improved compared with the unmodified PVDF membrane, which is consistent with the experiment data. The modified membrane performs well and shows great potential for oil-water separation.
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 Environmental Chemical Engineering
·
2023
·
IF 7.7
Na Yang,Hao Jiang,Longfei Zhang,Xiang Wang,Luhong Zhang,Yongli Sun,Bin Jiang
Spinel oxides can be considered effective heterogeneous catalysts in activating peroxymonosulfate (PMS) for wastewater decontamination . However, the intrinsic characteristics of agglomeration and metal ion leaching impede its further application. In this work, to further improve the catalytic efficiency and stability of the catalyst, ZIF-8 was employed as the candidate and further etched by tannic acid (TA) to obtain a core-shell structure with less mass transfer resistance. Following this, CoFe 2 O 4 was anchored on TA-ZIF-8 matrix via a hydrothermal method. Benefiting from the tailored core-shell structure and high activity of CoFe 2 O 4 , the as-prepared CoFe 2 O 4 @TA-ZIF-8 catalyst shortened the mass transfer distance of radical to target pollutant, thus realizing high radical utilization efficiency. Accordingly, 98.1% of tetracycline (TC) can be eliminated in 30 min with kinetic constants 3.15 times higher than pristine CoFe 2 O 4 . Besides, the TC degradation efficiency can still maintain 84.1% after five consecutive cycles with cobalt leaching lower than 0.306 mg/L, showing favorable stability compared with pristine CoFe 2 O 4 . Furthermore, electron paramagnetic resonance (EPR) and quenching experiments exhibited that singlet oxygen and sulfate radicals play dominant roles in TC degradation processes. This work fabricates an efficient CoFe 2 O 4 @TA-ZIF-8 heterogeneous catalyst for degrading refractory TC, which may possess potential applications in wastewater treatment .
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 46
·17472-17480
·
IF 8.067
Xiaowei Zhu,Yijiang Li,Tianchen Wei,Yichen Li,Tieling Xing,Matthew D. Shawkey,Guoqiang Chen
Photonic structures constructed from colloidal nanospheres present an attractive prospect for structural coloration in an ecological manner. However, the application of structural color in the field of textile coloration is usually blocked by their uncorrelated scattered light and feeble mechanical properties. Here, a non-iridescent structural color coating with high color saturation and mechanical stability is developed by assembling PS@TA–Fe(III) core–shell nanospheres. The rough surface and low surface charge are favorable for forming amorphous colloid arrays (ACAs) by restricting the crystalline alignment during the assembly process, resulting in non-iridescent structural colors. In addition, the as-prepared structurally colored cotton fabric possesses high color saturation and mechanical stability thanks to the intense light absorption and interface adhesion of the TA–Fe(III) shell. The preparation approach of this structural color coating is facile, low-cost, and environment-friendly, showing promising applications in textile coloration and smart displays.
研究领域:
材料科学
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER METALLURGY AND METAL CERAMICS
·
2021
·Vol. 59
·期 11
·651-660
·
IF 0.511
Zhangjun Bai,Yuhong Chen,Lu Li,Jiaxin Li,Yuewei Cheng
In this study, Ta–W–Ti–Al multialloys were prepared by spark plasma sintering (SPS) as a new powder metallurgy technology based on discharge activation and thermoplastic deformation process. The oxidation behavior of the as-obtained sintered alloys were investigated under 1000 and 1200°C in air atmosphere. Microstructures and phase compositions of alloys and oxides were analyzed using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and backscatter electron microscopy (BSE). The sintered samples possessed relative densities reaching up to 98% with achievable densification. The densities of all specimens with high Ti contents exceeded 100%, suggesting the great impact of Ti addition on liquid-phase precipitation. Intermetallic compounds were formed in Ta–W–Al alloys, and samples with high Ti contents displayed grain boundary phases rich in titanium and oxygen. The addition of Ti and Al effectively improved the oxidation resistance of the resulting alloys. A protective alumina layer was formed after oxidation at 1000°C that made oxidation kinetics of the alloys obeying pseudo-parabolic laws. At the oxidation temperature of 1200°C, Al 2 O 3 reacted with Ta 2 O 5 to form the AlTaO 4 alloy with reduced protective effect. The mass gain in the alloys after oxidation at 1200°C for 4 h was about 7 times higher compared to processing at 1000°C.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yuanyuan Wang,Suyue Zhong,Shumin Li,Yangyang Dai,Wenjun Su,Jian Li
Rapid industrialization poses a serious threat to the balance of ecosystems and environmental sustainability, and the application of membrane technology is an effective way to alleviate this situation. Two-dimensional (2D) MXene nanosheets are superior materials for constructing high-performance separation membranes, but their biggest drawback is that they are prone to agglomeration. After alkalizing them, the obtained alkaline MXene (TCOH) nanosheets have hydroxyl-rich surfaces, stabilized structure and great affinity for CO 2 . Based on this, a self-supported TA-ZIF-8/TCOH@Pebax mixed matrix membranes (MMMs) with block polymer Pebax-1657 as matrix and TA-ZIF-8/TCOH as composite filler were prepared in this work. ZIF-8 was modified with tannic acid (TA) to enrich the surface with hydroxyl groups, yielding TA-ZIF-8 that is both pro-CO 2 and well interfacially compatible. The using of TA-ZIF-8 not only improves the selectivity of the separation membrane, but also its mutually repulsive electrostatic force with TCOH can expand the layer spacing of TCOH nanosheets as much as possible, which leads to a rich gas transportation channel of the membrane. Experiments have shown that the prepared TA-ZIF-8/TCOH@Pebax MMM had outstanding separation performance beyond the 2019 Robinson upper bound when the content of TA-ZIF-8 was appropriate. Also, the TA-ZIF-8/TCOH@Pebax MMM showed superior thermal stability, durability and mechanical properties. In summary, the strategy of combining nanoparticles and nanosheets as composite fillers in this study provides an effective way to regulate the low permeance of MMMs. In the meantime, the application of TCOH provides a novel idea for further research on gas separation membranes.
研究领域:
材料科学
·
环境工程
✓ 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）