JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Liying Jiang,Qichao Ye,Jianmeng Chen,Zhong Chen,Youli Gu
In this study, bentonite–Fe 3 O 4 –MnO 2 composite was synthesized by combining bentonite with Fe 3 O 4 and MnO 2 through co-precipitation. Vibrating-sample magnetometry , scanning electron microscopy with energy-dispersive X-ray spectrometry , transmission electron microscopy , Brunauer–Emmett–Teller measurements, and X-ray powder diffraction techniques were used to characterize the composite. The composite consists of Fe 3 O 4 nanoparticles orderly assembled on the surface of bentonite and an outer layer of MnO 2 sheets. The composite’s particles possess a saturation magnetization of 13.4–30.5 emu/g and a high specific surface area (203.89 m 2 /g). The adsorption behaviors of the composite in Cd(II) removal were evaluated by batch equilibrium experiments. Kinetic and isothermal data fit well the pseudo-second-order and the Freundlich models, respectively. Adsorption reached equilibrium within 30 min, and the Freundlich capacity of the composite was 35.35 mg/g. The adsorption capacity of Cd(II) increased with increasing pH and was dependent on the ionic strength . Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy showed the combination of surface hydroxyl groups of the composite and Cd(II) in the solution. The prepared composite can be easily recycled and reused by taking advantage of its magnetic properties . The results show that the designed composite is a promising absorbent for the treatment of Cd-contaminated water.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Shanshan Pan,Hui Liu,Zhili Li,Li You,Shengnan Dai,Jiong Yang,Kai Guo,Jun Luo
Due to the lone-pair-induced anharmonic rattling, InTe exhibits intrinsically ultralow thermal conductivity , which was considered as a candidate for thermoelectric application. However, the poor electrical transport properties result in low thermoelectric conversion efficiency. In this work, Cd doping in InTe have been performed with the aim to optimize the carrier concentration and increase the power factor. Furthermore, an essential enhancement of carrier mobility can be realized via prolonging the annealing time, leading to improved thermoelectric performance. As a result, the maximum thermoelectric figure of merit zT of 0.87 at 773 K has been achieved for In 0.98 Cd 0.02 Te undergoing 7 days annealing treatment (In 0.98 Cd 0.02 Te-7days), which is 67% higher than the value of InTe after 2 days annealing (InTe-2days, zT = 0.52@773 K). The average zT increases significantly from 0.26 for InTe-2days to 0.53 for In 0.98 Cd 0.02 Te-7days in the temperature range of 323–823 K. Thus, both introducing Cd dopant and regulating the annealing time have obvious effects on improving the thermoelectric performance of InTe.
研究领域:
材料科学
·
热电学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jing Qian,Manman Lu,Shixia Cui,Taoyu Han,Stavros Avramidis,Shengquan Liu,Jiejie Sun
This study investigated the application risk and value of Cd-enriched poplar wood, focusing on its wood properties, leaching characteristics, and brown rot resistance. The results indicated that Cd deposition in cell walls significantly inhibited brown rot fungi, thereby enhancing decay resistance. Furthermore, the extent of improvement in brown rot resistance was linked to wood density: the higher the density of Cd-enriched poplar wood, the stronger its resistance to brown rot. As the Cd concentration increased, the Cd distribution abundance and the wood crystallinity gradually increased. Structural changes were observed, including fluctuating microfibril angle and double wall thickness of fibers and vessels. Cd concentrations exceeding 50 mg/kg altered the chemical composition of the cell walls. The binding form of Cd in wood cell wall showed a trend of bound Cd ＞ free Cd ＞ residual Cd. Cd leaching occurred under cyclic soaking in water, which may lead to secondary contamination. However, under the condition of 75 % relative humidity, Cd leaching was negligible, suggesting potential for safer use in controlled environments. These findings provide valuable insights into the management and application of Cd-enriched wood, especially in contexts where decay resistance is critical or in water-exposed environments.
研究领域:
林学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Chunlai Wu,Yalei Miao,Juan Li,Jiaxiang Cao
Ionic liquids have been considered as green solvent for metal ion extraction. However, the high cost, low efficiency and hard phase separation limit their application. In this work, nano SiO2 supported ionic liquid (SiO2@NH-IL) prepared via simple homogeneous sol-gel method was used for adsorptive removal of Cd(II) from water sample. The material was characterized by XRD, TEM and FT-IR and zeta potential analysis. The adsorption kinetics, adsorption isotherm and reusability as well as the adsorption mechanism were investigated. The effects of solution pH and temperature were also studied. It was found that this nano-adsorbent could be used to remove trace level of Cd(II) efficiently due to the strong coordination of Cd(II) with the ionic liquid. Thermodynamic and kinetic studies showed that the adsorption rate increased with the increase of temperature, the maximum adsorption capacity was 112.13 mg g−1 at higher temperature (i.e. 80 °C), and the adsorption equilibrium could achieve in 30 min. The nano-adsorbent could be easily regenerated by 0.5 mol L−1 of HCl and reused as least ten adsorption/desorption cycles. The as-prepared nano-adsorbent are potential candidate for adsorptive removal of Cd(II) in polluted wastewater, especially with higher temperature.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Wangfei Yu,Guannan Wang,Huizhi Chen,Honglei Mu,Ben Niu,Yanchao Han,Lishu Wang,Hangjun Chen,Haiyan Gao
To address the poor hydrolytic stability of CD-MOF in food applications, CD-MOF loaded with thymol (TCDM) was prepared and filled into a pectin (PEC)/sodium alginate (SA) substrate with the aid of zein to obtain a thymol-CD-MOF/zein-PEC-SA (TCDM/ZPS) polymer film. Characterization revealed that zein-PEC/SA (ZPS) protected TCDM by forming amphiphilic microspheres. TCDM was able to exist stably in the hydrophilic polysaccharide substrate and achieve a long-term slow release over 336 h. Besides, environmental humidity could also be used as a switch for regulating the thymol release rate, which was consistent with the first-order release model (R 2 > 0.99). TCDM and TCDM/ZPS showed excellent antimicrobial effects against E. coli , S. aureus , and B. cinerea , the most common fungi in plant-based foods. The preservation experiment maintained the quality of strawberry and Agaricus bisporus mushroom. This strategy holds the potential to broaden the application scope and enhance the utility of CD-MOF in food preservation.
研究领域:
食品科学
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材料科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8201-8206
·
IF 1.354
Ding Xu,Zhu Geng,Guan Jian-Ning,Han Guo-Zhi
In this paper, we first report the selective reduction of nitro group in aryl halides catalyzed by silver nanoparticles modified with β-CD. Taking advantage of hydrophobic lumen and donor–acceptor behavior of β-CD, the halogenated alkyl groups on the aromatic
ring can be enveloped in the inner cavity that thereby inhibits the reduction of the halogen. For validating the mechanism proposed by us, different silver nanoparticles were applied in parallel experiments. In our experiments, UV-vis spectra and NMR spectra were used to characterize the selectivity.
This strategy represents an outstanding improvement on the synthesis of halogenated aromatic amines in comparison with the traditional route, and greatly expands the application of silver nanoparticles in catalytic field.
研究领域:
化学
·
材料科学
·
催化反应
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Fangfen Jing,Xin Xu,Weiwei Lu,Mingzhu Jin,Xinyang He,Rongtai Yu
Polymer-based adsorbents have emerged as promising candidates for heavy-metal remediation due to their tailorable porosity and multifunctional surfaces, yet challenges persist in achieving both structural precision and adsorption efficiency. Here, we report a concave hollow double-layer nanosphere (CHDN) synthesized through a facile self-assembly strategy engineered for selective capture of Cd(II) and Pb(II) ions. Comprehensive characterization via transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, and thermogravimetric analysis (TGA) confirmed the hierarchical architecture with abundant amino/hydroxyl moieties. The CHDN demonstrated exceptional adsorption capacities of 198.40 mg/g for Cd(II) and 60.34 mg/g for Pb(II), outperforming conventional adsorbents. Isotherm analysis revealed Cd(II) adsorption followed the Sips model (R2 > 0.99), while Pb(II) adhered to the Langmuir model, suggesting monolayer and heterogeneous binding mechanisms, respectively. Kinetic studies further corroborated chemisorption dominance through pseudo-second-order fitting for Cd(II) and Elovich compatibility for Pb(II). We propose a synergistic mechanism involving ligand complexation and ion exchange, facilitated by the dual functionality of surface groups and structural advantages of the concave architecture. This work provides a blueprint for designing spatially engineered polymers for environmental remediation.
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 THE INDIAN CHEMICAL SOCIETY
·
2021
·
IF 0.284
Lili Xu,Hongbo Suo,Renmin Liu
A facile magnetic chitosan composite used for heavy metal ions removal was prepared. The adsorbents with large specific area and rich carboxyl groups exhibited good removal of Cd(II) ions and could be easily separated with magnetic separation. The adsorption capacity of Cd(II) was 48 mg g −1 and the removal efficiency reached 86.7% after five cycles. Thus, the prepared magnetic chitosan composite could act as a potential adsorbent for Cd(II) ions removal.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Biochar
·
2020
·Vol. 2
·期 1
·81-92
·
IF 0
Zhu Sihang,Qu Ting,Irshad Muhammad Kashif,Shang Jianying
A novel α-FeOOH modified wheat straw biochar (α-FeOOH@BC) was developed and the findings of the current study showed that α-FeOOH@BC is an efficient material for the simultaneous removal of cations (Cd(II)) and anions (As(III)) from aqueous solutions. The SEM, FTIR, and XRD analysis proved that α-FeOOH@BC was covered by α-FeOOH. In the single adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) were 62.9 and 78.3 mg/g, respectively. In the dual adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) dropped to 39.3 and 67.2 mg/g, respectively. The adsorption capacities of Cd(II) and As(III) by α-FeOOH@BC were much higher by BC and α-FeOOH both in single and dual adsorbate system. The adsorption results were well fitted by the Langmuir and pseudo-second-order kinetics models. The Cd(II) and As(III) co-adsorption on α-FeOOH@BC had a competitive effect, and the dominant adsorption mechanisms were co-precipitation and ion exchange. Our study showed that α-FeOOH@BC could be an effective remediation material for Cd(II) and As(III) co-adsorption from aqueous environment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 3
·2277-2289
·
IF 2.599
Meng Jian,Cui Jianlan,Yu Jing,Huang Wei,Wang Peng,Wang Kui,Liu Mingqiao,Song Changyuan,Chen Peng
Chitosan chains (CTS) were grafted onto polyvinyl alcohol fibers (PVAf) with the aid of coupling agent γ -glycidoxypropyltrimethoxysilane, producing grafted fibers PVAf- g -CTS. Then, chloroacetic acid (CA) was used to react with the chitosan chains on the PVAf- g -CTS surface via nucleophilic substitution reaction to produce fibrous PVAf- g -CACTS with multiple adsorption sites. The products were characterized by using FTIR, SEM, XRD and XPS, revealing that the reaction followed the S
N
2 mechanism. Optimum parameters, including a reaction temperature of 50 °C and a mass ratio of PVAf- g -CTS to CA of 1:0.12, were determined for the reaction. Adsorption experiments confirmed that PVAf- g -CACTS showed greater adsorption characteristics for Cd(II) in aqueous solutions compared with PVAf- g -CTS and PVAf. In particular, the rate of Cd(II) uptake by using PVAf- g -CACTS was higher, and the equilibrium was reached within 80 min. When pH was 7, the saturated adsorption capacity reached 47.65 mg g −1 . The adsorption kinetics conformed to the pseudo-second-order model, and the adsorption process was in accordance with the Langmuir and Temkin isotherm model. Adsorption–desorption cycle experiments showed that PVAf- g -CACTS had good performance of reuse, and the adsorption mechanism was analyzed further by using XPS.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Qi Guo,Yuhao Zhang,Luting Yan,Xiaoya Meng,Yue Wang,Hongguo Zhai,Xiaofeng Chen,Xia Sun,Yemin Guo,Yanyan Zhang
The use of low-cost working electrodes is of great importance for the development of sensor industrialization. Acupuncture needles electrode (ANE) was selected as working microelectrode, a sensor was designed based on poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT: PSS) and chitosan (CS) modified covalent organic frameworks (COFs) (CS/COFs) for detection of cadmium (Cd(II)). First, a mixture of PEDOT and PSS was electrodeposited on the surface of the acupuncture needles to synthesize a PEDOT: PSS as conductive polymeric film to support the electron transfer capability and enhance the conductive efficiency of the sensor. Then, CS/COFs was self-assembled and attached to the PEDOT: PSS/ANE surface by π-π stacking intermolecular interaction forces and the viscosity of CS, thus increasing the specific surface area of the electrode. Differential pulse anodic stripping voltammetry (DPASV) was used as the electrochemical method for detection of Cd(II). And the results indicated that the CS/COFs/PEDOT: PSS/ANE was linearly responsive in the range of 400 μg/L to 2400 μg/L, and the LOD was 13.8 ng/L for Cd(II). The constructed sensor also showed great selectivity, reproducibility, and stability. Additionally, the sensor demonstrated outstanding recovery in the detection of Cd(II) in real sample scallops. This sensing construction method based on acupuncture needles as working electrodes is of great significance to the development of sensor industrialization and aquatic product safety detection.
研究领域:
分析化学
·
环境科学
·
食品安全检测
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting and environmental remediation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 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）