INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
·
2019
·
IF 2.237
Xiaotao Mai,Dinggui Luo,Lezhang Wei,Yu Liu,Xuexia Huang,Qihang Wu,Guangchao Yao,Guowei Liu,Lirong Liu
The effects of chelating agents on heavy metal activation in Cd- and Pb-contaminated soils were studied through a dynamic activation experiment. An evaluation method for the measuring comprehensive suitability of chelating agent was established by calculating indexes for the degree of activation effect suitability and activated heavy metals’ half-life suitability. The following results were obtained: in Cd- and Pb-contaminated soils, heavy metal activation effects reached or approached maximum activating effects within 1 d and subsequently showed different levels of decline in all chelating agent treatment conditions. Declines in activation effects similarly subjected to the law of exponents over time and to the goodness of fit in DTPA, NTA, and GLDA ranged from 0.80 to 0.98. For Cd- and Pb-contaminated soils, chelating agents' levels of comprehensive suitability (H) were recorded as follows: NTA(1.40) > GLDA(1.31) > DTPA(1.14) > EDTA(1.00) > EDDS(0.14) > CA(0.06) and GLDA(1.56) > DTPA(1.48) > EDTA(1.00) > NTA(0.78) > EDDS(0.26) > CA (0.02). GLDA and DTPA are both suitable for Cd and Pb phytoextraction. Moreover, NTA and GLDA are optimal chelating agents for Cd and Pb phytoextraction, respectively.
研究领域:
环境科学
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土壤学
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产品关联
DOI
PubMed
高影响因子
FISH & SHELLFISH IMMUNOLOGY
·
2018
·
IF 3.185
Wei Shi,Xiaofan Guan,Yu Han,Cheng Guo,Jiahuan Rong,Wenhao Su,Shanjie Zha,Yichen Wang,Guangxu Liu
Exposure to heavy metals such as Cadmium (Cd) may exert detrimental impacts on the immune responses of marine bivalve species. However, the immunotoxicity of Cd on blood clams remains unknown to date. Furthermore, though Cd 2+ is known to compete with calcium (Ca 2+ ) ions for their binding sites in cells and inhibit Ca 2+ influx, whether Cd 2+ weakens the immune responses of marine bivalves through inducing intracellular Ca 2+ disorders still remains unclear. Therefore, the immunotoxicity of Cd 2+ at different waterborne Ca 2+ concentrations on blood clam, Tegillarca granosa , were investigated in the present study. Results obtained demonstrated that the total number, phagocytic activity , and red granulocytes ratio of the haemocytes were all significantly reduced after 10 days exposure of individuals to 25 μg/L Cd 2+ . However, when the waterborne Ca 2+ concentrations were elevated by 10% and 20% (approximately 370 and 410 mg/L, respectively), mitigation effects on the immune responses of individuals were detected. In addition, though the expressions of genes from the Ca 2+ signaling and Ca 2+ -related apoptosis pathways were significantly altered by Cd 2+ exposure, the expression patterns of these genes were similar to that of the control when the waterborne Ca 2+ concentrations were elevated, suggesting a relieving effect of waterborne Ca 2+ on Cd 2+ induced toxicity to haemocytes. The results obtained in the present study revealed that waterborne Cd 2+ may hamper the immune responses of T. granosa through influencing Ca 2+ signaling and Ca 2+ -related apoptosis pathways, which can be partially mitigated by elevating the waterborne Ca 2+ concentrations.
研究领域:
海洋生物学
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毒理学
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免疫学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Weixia Yang,Yu Qiang,Mengshuo Du,Youyu Cao,Yingying Wang,Xiaoshuo Zhang,Tianli Yue,Jihong Huang,Zhonghong Li
The outstanding performance efficiency for the removal of heavy metal ions in solution is governed by various factors: (a) sufficient contact probability between heavy metal ions and the adsorbent, (b) convenient diffusion/accessibility of heavy metal ions to the surface and the interior of the adsorbent, and (c) abundant binding sites for heavy metal ions on the adsorbent. We designed an efficient MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 adsorbent for Pb(II) and Cd(II) removal. The adsorbents were fabricated by merging self-propelled nanomotors, exploiting hierarchical structure, and using a metal-organic framework (MOF) composite to simultaneously meet the three requirements. The sufficient contact probability between Pb(II)/Cd(II) and MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 was achieved via the self-propelled movement of MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 which was induced by the catalytic decomposition of H 2 O 2 by MnO 2 . The convenient diffusion/accessibility of Pb(II)/Cd(II) on the surface and interior of MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 was achieved by exploiting the properties of the hierarchical structure of MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 . Abundant binding sites (-COOH) on MIL-53 and UiO-66 composites were present for the binding of the Pb(II)/Cd(II) ions to the adsorbent. The adsorption capacities of the nanomotor adsorbent for Pb(II) and Cd(II) were 1018 and 440.8 mg g –1 at 25 °C, respectively. Additionally, the complex formed of MnFe 2 O 4 and MIL-53 endowed the adsorbent with easy-recyclable properties under the influence of an external magnet. The nanomotors exhibit satisfactory removal performances for Pb(II) and Cd(II).
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 93
·期 10
·2898-2905
·
IF 2.587
Le Chen,Dan-Dan Zhu,Guo-Jian Ji,Sheng Yuan,Jun-Feng Qian,Ming-Yang He,Qun Chen,Zhi-Hui Zhang
Background Metal−organic frameworks (MOFs) are energy-efficient adsorbents for separating industrial chemical feedstocks. A type of MOF containing an extended porous network of γ-cyclodextrin (γ-CD) and alkali metal salts, CD-MOF, has potential applications in adsorption separation processes in the petrochemical industry. This study aims to present the adsorption efficiency of CD-MOF-1 in separating xylene regioisomers. Results The adsorption separation of xylene regioisomers on layered CD-MOF-1 microcrystals was studied using batch vapor-phase adsorption and liquid-phase breakthrough adsorption. CD-MOF-1 showed preferable adsorption of o -xylene over the other two isomers, with adsorption strength in the order o -xylene ( o X) > m -xylene ( m X) > p -xylene ( p X). With increased temperature, high adsorption capacities of o X and m X over p X were detected. However, this also resulted in a decrease of the separation factors of o X/ p X and m X/ p X. Conclusion The high resolution and large separation factors for o X/ p X and m X/ p X make CD-MOF-1 an efficient and reliable alternative adsorbent to the isolation protocols for xylene isomers currently used in the petrochemical industry. © 2018 Society of Chemical Industry
研究领域:
化学工程
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材料科学
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石油化工
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DOI
高影响因子
CHEMISTRY OF MATERIALS
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2022
·
IF 10.508
Jiarong Lv,Yanyan Qian,Qun Jing,Xinmei Wang,Ming-Hsien Lee,Zhaohui Chen
For phosphate nonlinear optical (NLO) materials, how to improve their small birefringence is confronted with a great contradiction of their weak optical anisotropy of tetrahedral PO4 groups. Herein, by introducing La3+ with a closed-shell structure and Cd2+ with a d10 electronic configuration, two NLO materials with a large birefringence, namely, La(PO3)3 (0.040@1064 nm) and β-Cd(PO3)2 (0.059@1064 nm), have been synthesized by a high-temperature solution method. In particular, for β-Cd(PO3)2, it possesses the largest birefringence among the known deep-ultraviolet (DUV) phosphates to date, which is attributed to cooperative effects of strong covalence of Cd–O groups and P–O pseudolayers similar to those of a plane. Meanwhile, β-Cd(PO3)2 exhibits the shortest cutoff edge (<190 nm) among the reported Cd-based inorganic compounds and realizes a balance between DUV transparence and a large birefringence. This insight provides a new opportunity to design high-performance NLO materials using metal phosphates.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 43
·e54581
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IF 3
Zhengwen Lin,Fang Li,Xinyu Liu,Junlin Su
With the development of deep formations, high temperature and high salinity seriously affect the rheology and filtration performance of water-based drilling fluids. Therefore, in this study, a network-structured polymer (DSD-β-CD) with low viscosity effect was synthesized using β-cyclodextrin (β-CD) as the backbone and N,N-dimethylacrylamide (DMAA), sodium p-styrene sulfonate (SSS), and dimethyl diallyl ammonium chloride (DMDAAC) as monomers. The polymer was analyzed by transmission electron microscope, Fourier transform infrared spectrum, nuclear magnetic resonance, and thermogravimetric analysis. The filtrate reducer in this study showed excellent temperature and salt resistance, the filtration loss of the water-based drilling fluid containing 3.5% DSD-β-CD and 18% NaCl was 5.1 mL after hot rolling at 220°C for 16 h. Additionally, its viscosity was 0.2 mPa s higher than that of the water-based drilling fluid with 18% NaCl, showing an excellent low viscosity effect. The filtration loss reduction mechanism of DSD-β-CD was investigated by viscosity analysis, mud cake analysis, particle size distribution, hydration swelling of bentonite, and Zeta potential. The results showed that DSD-β-CD could be adsorbed on the surface of bentonite particles through hydrogen bonds and ionic bonds, which increased the dispersion of bentonite particle and the compactness of the mud cake, thus reducing the filtration loss.
研究领域:
材料科学
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石油工程
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产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 13
·1910
·
IF 3
Luxuan Feng,Xiaofeng Chen,Jinghua Yao,Lei Xiao,Xiujuan Feng,Shengmin Wu
Heavy metal pollution in the soil around bauxite mines, especially cadmium pollution, is becoming more and more severe due to this mining becoming more frequent. Therefore, it is urgent to develop green and safe remediation technology. Biostimulants have been studied extensively, but their practical application is still challenging. In this study, the effects of humic acid (HA), glucose (GLU), and tetrasodium glutamate diacetate (GLDA), as well as their synergistic complex bacterial flora, on Cd-contaminated soil were analyzed. It has been shown that applying these three types of stimulants, individually or with complex bacterial flora, can enhance soil environment and quality. Nevertheless, the remediation efficacy of stimulants in combination with microbial communities surpasses that achieved through the use of stimulants alone. Among them, 1%GLU combined with complex bacterial flora had the best passivation effect on Cd, reducing the available Cd by 25%, followed by 0.5% GLU combined with complex bacterial flora and 0.5%HA combined with complex bacterial flora, which reduced the available Cd by 21.92% and 19.17%, respectively. The synergistic remediation method using stimulants and microorganisms can reduce the harm caused to the environment by conventional remediation methods and improve the effectiveness of soil remediation. It has broad application prospects in the field of bauxite-contaminated soil remediation.
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2021
·
IF 5.565
Ying-heng Fei,Zuannan Zhang,Zhuofeng Ye,Qihang Wu,Ye-tao Tang,Tangfu Xiao
Transforming to biochar provides an environmentally friendly approach for crop residue reutilization, which are usually applied as sorbent for heavy metal removal. As typical silicon-rich material, the specific sorptive mechanisms of rice straw derived biochar (RSBC) are concerned, especially at the low concentration range which is more environmentally relevant. In the present study, Cd sorption onto RSBCs at the concentration of ≤ 5 mg/L was investigated. The sorptive capacity was positively correlated with the pyrolytic temperature of the biochar and the environmental pH value. Water soluble minerals of the RSBCs played the dominant roles in Cd sorption, contributing 29.2%, 62.5% and 82.9% of the total sorption for RSBCs derived under 300°C, 500°C and 700°C, respectively. Increased number of cations, dominantly K + , were exchanged during the sorption. Coprecipitation with cations and carbonates may also be contributive to the sorption. The dissolution of silicon-containing minerals was found to be declined during sorption, suggesting its involvement in the sorption process, possibly through precipitation. Whilst, the sparingly soluble silicate crystals may impose ignorable role in the sorption. Complexation with organic groups is only a minor mechanism in Cd sorption, compared to the much more dominant roles of the inorganic ashes.
研究领域:
环境科学
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土壤学
✓ 已验证
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Yanhong Wang,Xiuli Wang,Cuihong Wu,Xiaomei Wang,Xu Zhang
A hybrid adsorbent with inverse opal (IO) structure was prepared for removing Cd(II) from aqueous solution. The functional polymeric chains were grafted from the pore wall of IO silica to prepare the porous hybrid material by surface-initiated atom-transfer radical polymerization. Furthermore, the amidation reaction was carried out to obtain diethylenetriamine-modified hybrid adsorbent (IO SiO 2 -g-PAA-DETA). Batch adsorption of removing Cd(II) onto IO SiO 2 -g-PAA-DETA was studied as the effect of solution pH, adsorbent doses, contact time, ionic concentration, and temperature. When the grafted amount was 73%, the maximum adsorption capacity was obtained. The optimum adsorbent dose and pH value for adsorbing Cd(II) were found to be 5 g/L and 0.5 g/L, respectively. The adsorption capacity was almost unaffected by Na + at low concentrations. The adsorption data was depicted by the corresponding models and the results displayed that adsorbing Cd(II) on IO SiO 2 -g-PAA-DETA followed the Freundlich and pseudo-first-order model. In addition, after six adsorption–desorption cycles, IO adsorbent could remain above 80% of the first adsorption ability while it was washed using 0.025 M EDTA.
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
BIOMACROMOLECULES
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2015
·
IF 5.75
Hao Yang,Chuan Zhang,Chang Li,Yong Liu,Yingli An,Rujiang Ma,Linqi Shi
Polymeric nanoparticles with glucose-responsiveness are of great interest in developing a self-regulated drug delivery system. In this work, glucose-responsive polymer vesicles were fabricated based on the complexation between a glucosamine (GA)-containing block copolymer PEG45-b-P(Asp-co-AspGA) and a phenylboronic acid (PBA)-containing block copolymer PEG114-b-P(Asp-co-AspPBA) with α-CD/PEG45 inclusion complex as the sacrificial template. The obtained polymer vesicles composed of cross-linked P(Asp-co-AspGA)/P(Asp-co-AspPBA) layer as wall and PEG chains as both inner and outer coronas. The vesicular morphology was observed by transmission electron microscopy (TEM), and the glucose-responsiveness was investigated by monitoring the variations of hydrodynamic diameter (Dh) and light scattering intensity (LSI) in the polymer vesicle solution with glucose using dynamic light scattering (DLS). Vancomycin as a model drug was encapsulated in the polymer vesicles and sugar-triggered drug release was carried out. This kind of polymer vesicle may be a promising candidate for glucose-responsive drug delivery.
研究领域:
生物材料
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Min Yang,Yongbo Wang,Yingkun Ren,Enzhou Liu,Jun Fan,Xiaoyun Hu
In our study, the synthesis conditions of ternary alloyed ZnCdS quantum dots (QDs) with different Zn/Cd molar ratios were investigated. Our results indicated that the optimal reaction conditions of ZnCdS QDs with various molar ratios were different. The ternary ZnCdS QDs were synthesized by a rather simple, facile, low-cost and effective aqueous synthesis method using air-stable compounds. UV–visible (UV–Vis) absorbance and photoluminescence (PL) emission spectra of the ZnCdS QDs showed a blue shift with the decrease of Cd, indicating the formation of alloyed QDs. The optimal reaction conditions, such as refluxing time and S/(Zn+Cd) molar ratios were different for ZnCdS QDs with different Zn/Cd ratios. The cause of the difference was attributed to the different properties of metal ions. In addition, the investigation on the photostability showed that the as-prepared ternary alloyed QDs had strong light resistance. Therefore, the ternary alloyed QDs with outstanding optical properties and high photostability showed potential biological applications and the results also offered new insights for the synthesis of ZnCdS QDs.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 4
·
IF 2.515
Zhongjun Xue,Na Liu,Hongxiang Hu,Jieying Huang,Yusef Kianpoor Kalkhajeh,Xiuyuan Wu,Nian Xu,Xiaofei Fu,Linchuan Zhan
Mesoporous ceramic functional nanomaterials (MCFN) is a self-assembled environmental adsorbent with a monolayer molecular which is widely used in the treatment of industrial wastewater and contaminated soil. This work aimed to study the relationship between the adsorption behaviour of Cd(II) by MCFN and contact time, initial concentration, MCFN dosage, pH, oscillation rate and temperature through a batch adsorption method. The adsorption kinetic and isotherm behaviours were well described by the pseudo-second-order and Langmuir models. The batch characterization technique revealed that MCFN had several oxygen-containing functional groups. Using Langmuir model, the maximum adsorption capacity of MCFN for Cd(II) was 97.09 mg g−1 at pH 6, 25°C, dosage of 0.2 g and contact time of 180 min. Thermodynamic study indicated that the present adsorption process was feasible, spontaneous and exothermic at the temperature range of 25–55°C. The results of this study provide an important enlightenment for Cd removal or preconcentration of porous ceramic nanomaterial adsorbents for environmental applications.
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
危险品化学品经营许可证（带存储）