Desalination and Water Treatment
·
2024
·
IF 1
Zhoubing Cheng,Qunpeng Cheng
ABSTRACT In this study, the performance of modified MCM-41 adsorbents by impregnation and grafting modification with 3-aminopropyltriethoxysilane (APTS) and polyethyleneimine (PEI) on the CO 2 adsorption was investigated. The results showed that the synergistic effect of APTS and PEI could improve the adsorption performance and thermal stability of the MCM-41 adsorbents. The CO 2 adsorption capacity of mixed amine-modified MCM-41 adsorbents was higher than single amine modified MCM-41 adsorbents. The maximum adsorption capacity (2.6512 mmol g –1 ) was obtained at MCM-41-APTS-5%-PEI-50%. Meanwhile, the adsorbents modified by mixed amine showed good cycle regeneration stability after five times of CO 2 adsorption/desorption cycling.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 8
·6043-6050
·
IF 3.708
Jiang Xue Dong,Fei Qu,Nian Bing Li,Hong Qun Luo
This paper reports a dramatic cyclic regeneration of polyethyleneimine-templated silver nanoclusters (PEI-AgNCs) based on the pH-induced conformational changes of polyethyleneimine (PEI) in aqueous solution. The PEI-AgNCs have been synthesized and found to be highly sensitive to the pH of the solution in air. The studies show that small AgNCs would gather to form larger silver nanoparticles (AgNPs) by adjusting the pH to 1.5 with a nitric acid solution. The AgNPs in solution was then transformed gradually to Ag(I) ions with stirring in air. Subsequently, the above Ag(I) ions were reduced again to AgNCs by changing the pH to about 9 with a NaOH solution and adding a certain amount of formaldehyde as a reductant to solution. The fluorescence and UV-visible absorption spectra recorded this process in detail. The transmission electron microscopy images, X-ray powder diffraction patterns, and Fourier transform infrared spectra further demonstrated that the cyclic transformation existed among AgNCs, AgNPs, and Ag(I) ions. The amino-rich PEI plays a crucial role in the regeneration of PEI-AgNCs. A large number of amino groups on PEI could be reversibly protonated by adjusting the pH of solution, leading to a change of the interaction between Ag and PEI, which has laid foundation for this work.
研究领域:
纳米材料
·
化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Xiaoxiao Ding,Yatao Yang,Zequan Zeng,Zhanggen Huang
Dioxins in the sintering flue gas are usually removed through integrated elimination technologies by carbonaceous catalysts. However, the regeneration of the used catalyst is poorly investigated, leading to the risk of leakage of dioxins. Herein, the influences of cyclic regenerations on the dioxin removal performance of a catalyst (V2O5/AC) were investigated systematically with dibenzofuran (DBF) as a model pollutant. It was demonstrated that the adsorption capacity and oxidation activity of catalysts significantly declined after several regeneration cycles due to the decreasing external specific surface area and V5+, respectively. Compared with 79.12% DBF directly emitted from a regenerator during N2 regeneration, the emission of DBF was only 29.93% with the modification of the regeneration process through O2 addition and temperature adjustment. The possible regenerated products were also analyzed to disclose the transformation behaviors of DBF. The regeneration mechanisms of DBF followed the transformation pathway of dibenzofuranol, benzofuran, anhydride species, and ultimately to CO2 and H2O. Moreover, the accumulated heavy aromatics on the surface could be decomposed by introducing O2. This research provides a comprehensive understanding of dioxin transformation behavior and a theoretical basis for efficient control of dioxin removal in the whole integrated removal technologies.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2018
·Vol. 11
·期 1
·86
·
IF 2.467
Guangyan Tian,Wenbo Wang,Yongfeng Zhu,Li Zong,Yuru Kang,Aiqin Wang
Activated clay minerals have been widely used in the edible oil refining industry for decolorization of crude oil by adsorption, and so far many methods have been used to improve their decolorization efficiency. Herein, we successfully prepared a series of carbon/attapulgite (C/APT) composite adsorbents by a one-step in-situ carbonization process with natural starch (St) as the carbon source. It has been revealed that the adsorbent had better decolorization efficiency for crude palm oil than acid-activated APT. However, more than a million tons of decolorized waste is produced every year in the oil-refining industry, which was often treated as solid waste and has not yet been reutilized effectively. In order to explore a viable method to recycle and reuse the decolorant, the waste decolorant was further prepared into new C/APT adsorbents for the removal of dyes from wastewater, and then the dyes adsorbed on the adsorbent were used as the carbon sources to produce new C/APT adsorbents by a cyclic carbonization process. The results showed that the adsorbents prepared from the decolorized waste could remove more than 99.5% of the methylene blue (MB), methyl violet (MV), and malachite green (MG) dyes from the simulated wastewater with the dye concentration of 200 mg/L, and the C/APT–Re adsorbent consecutively regenerated five times using the adsorbed dyes as a carbon source still exhibit good adsorption efficiency for dyes. As a whole, this process opens a new avenue to develop efficient decolorants of palm oil and achieves recyclable utilization of decolored waste.
研究领域:
材料科学
·
环境工程
·
化学工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Huayu Xiong,Wei Wang,Jichao Liang,Wei Wen,Xiuhua Zhang,Shengfu Wang
Herein, we report a convenient approach to purify water-soluble bovine serum albumin (BSA)-capped metal nanoclusters by pH-induced precipitation under acidic conditions. The fluorescence of metal nanoclusters could be completely recovered upon the re-dispersion of nanoparticles into basic media. BSA metal nanoclusters have been prepared to monitor pH at highly acidic medium. When pH decreased, the fluorescence of the nanoclusters under a UV lamp decreased and completely disappeared after pH 4. And a fluorescent pH sensor for pH monitoring has been developed based on the “OFF–ON” signal switch of the gold clusters agarose hydrogel.
研究领域:
材料科学
·
生物化学
·
分析化学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Danyi Yang,Jingjing Wang,Yaxin Gu,Xinyu Zhi,Tianliang Wang,Jinbo Jia,Chengchun Tang,Yi Fang
The discharge of uranium-containing wastewater from nuclear fuel production poses severe threats to human health and environmental security due to the high mobility, solubility, and radiotoxicity of hexavalent uranium (U(VI)). However, developing an adsorbent that simultaneously achieves high adsorption capacity, fast kinetics, strong selectivity and good recyclability remains a major challenge. In this paper, porous boron nitride-loaded ZIF-67 composites (BN@ZIF-67-X) were synthesized by a simple in situ growth method and used for the removal of U(VI) from aqueous solutions. The results showed that BN@ZIF-67 exhibited excellent adsorption properties for U(VI) than pure p-BN and ZIF-67. It also demonstrated acceptable cyclic regeneration properties. In addition, the adsorption of U(VI) by BN@ZIF-67-2 achieved equilibrium within 60 min, the adsorption kinetics were well-described by the pseudo-second-order model, the isothermal model conformed to the Langmuir isothermal model, and the adsorption was an endothermic monolayer chemisorption process. The maximum adsorption capacity of U(VI) by BN@ZIF-67-2 was calculated to be 550.306 mg g −1 . Moreover, the adsorption of BN@ZIF-67-2 exhibited excellent selectivity in the adsorption of U(VI), which was dominated by surface complexation. In conclusion, BN@ZIF-67 is a promising adsorbent for the adsorption of U(VI) from aqueous solution.
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Zengli Wang,Yaheng Pang,Hongxia Guo,Huan Wang,Li Liu,Xiao Wang,Sheng Zhang,Wenquan Cui
The development of highly efficient and low cost CO 2 adsorbent becomes increasingly significant in order to achieve the goal of carbon neutrality. Herein we prepared a new type of 3-aminopropyltriethoxysilane (AP) and polyethyleneimine (PEI) amino-bifunctionalized adsorbent by grafting AP onto the acid thermally activated Halloysite nanotubes (HNTS) through the use of Si-OH. The results showed that the adsorption capacity of the CO 2 adsorbent (5-700-HNTS-20AP-40PEI) was 1.03 mmol/g at 50 °C and further increased to 1.51 mmol/g at 80 °C. The hydrogen bonding and dipole interactions between the amino groups in PEI and the hydroxyl and amino groups in AP promote the dispersion of PEI into pore channels of the carrier, thus reducing the aggregation and blockage. Moreover, the amino-bifunctionalized adsorbent exhibited satisfactory cyclic regenerability over 20 cycles. The analysis of adsorption kinetics and internal diffusion indicates that untreated HNTS is predominantly dominated by physisorption , whereas amino-modified solid adsorbents exhibit both physisorption and chemisorption with adsorption mainly occurring on the carrier surface.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Tongtong Hou,Yue Huang,Xin Wang,Xiaoling Hu,Ping Guan
The development of high-performance protein-imprinted materials remains challenging due to defects concerning high mass transfer resistance and non-specific binding, which are crucial for protein purification and enrichment. In this paper, lysozyme-imprinted mesoporous Zr-based MOF (mesoUiO-66-NH 2 @MIPs) with specific and selective recognition of lysozyme (Lyz) were prepared by surface imprinting technology. In particular, the excellent hydrophilicity mesoporous MOFs (mesoUiO-66-NH 2 ) with a pore size of 10 nm was prepared as a carrier for Lyz immobilization by an auxiliary modulation strategy to regulate the microporous structure of UiO-66-NH 2 with the propionic acid solution, enabling massive loading of the macromolecular protein Lyz. The mesoUiO-66-NH 2 @MIPs reached a maximum saturation adsorption of 206.54 mg g −1 on Lyz in 20 min at 25 °C with an imprinting factor of 2.57 and selection factors of 2.02, 2.34, and 2.45 for cytochrome c (Cyt c ), bovine serum albumin (BSA) and bovine hemoglobin (BHb), respectively. More importantly, the mesoUiO-66-NH 2 @MIPs could specifically recognize Lyz from the mixed protein system. The adsorption capacity of Lyz could still reach 78.55% after 5 cycles with good cyclic regeneration performance. This provides a new research option for developing and applying novel porous MOF in biomolecule imprinting technology and the specific separation of biomolecules.
研究领域:
生物材料学
·
蛋白质工程
·
分子印记技术
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产品关联
DOI
PubMed
高影响因子
APPLIED ENERGY
·
2017
·
IF 7.182
Yanping Ren,Ruiyu Ding,Hairong Yue,Siyang Tang,Changjun Liu,Jinbo Zhao,Wen Lin,Bin Liang
Amine-functionalized nanomaterials have significant potential in CO 2 capture technology because of their low energy consumption, stable performance, and high regeneration capacity. Novel amine-functionalized adsorbents composed of copper silicate nanospheres (CSNSs) grafted with mono-, di- and tri-aminosilanes were synthesized for CO 2 capture. The synthetic process and formation mechanism were systematically investigated using transmission electron microscopy, X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy, and N 2 physisorption analysis, etc. The copper silicates with rich surface hydroxyl groups, significant surface areas and mesoporous structures facilitated chemical modification of amines, leading to a high CO 2 adsorption capacity (a maximum CO 2 uptake of 47.88 mg/g) and excellent cyclic regenerability (maximum deviation of 3.51% after 20-times test) for CSNS-TA. In addition, the CO 2 capture process was carried out under relatively mild conditions, e.g., adsorption at 298 K, desorption at 373 K and ambient pressure , suggesting that these amine-modified CSNSs have potential as solid sorbents for CO 2 capture.
研究领域:
材料科学
·
环境工程
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Yongmei Fu,Mingxia Huang,Zhulin Zhou,Zhongjun Li,Wuping Liao,Youcai Lu
By introducing the amine group into the structure of P227, a novel extractant 2-ethylhexyl ((2-ethylhexylamino)methyl) phosphonic acid (EEAMPA, abbreviated as HA) was synthesized for the extraction and separation of trivalent rare earths (REs) from nitrate medium. The influence factors including extractant concentration, equilibrium time, HNO 3 concentration, separation factors, cycle regeneration, stripping acidity, and actual leach liquor of metal ions , were studied systematically. The results show that the extraction ability of EEAMPA for REs decreases with increasing acidity. A possible extraction mechanism is proposed and the extracted species as REHA 3 (NO 3 ) are confirmed by the slope analysis method. The extraction equilibrium can reach faster than P227. It shows good chemical stability and cycling regeneration. Stripping studies show that HCl is an excellent stripping agent and REs can be effectively stripped from the organic phase.
研究领域:
化学
·
材料科学
·
环境工程
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-9
·
IF 5.479
Chen Dongli,Zhang Meng,Zhou Fenyue,Hai Hong,Li Jianping
An electrochemiluminescent (ECL) biosensor is described for the determination of the breast cancer biomarker microRNA. The method is based on the amplification via target cyclic regeneration through a system of hairpin DNA probes, primers, and Klenow fragment of DNA polymerases combined with CdTe quantum dots (QDs) and gold nanoparticles. The assay is performed by exploiting the luminescence properties of CdTe-QDs and K 2 S 2 O 8 as a co-reactive agent to increase the ECL signal. It was successfully applied to ECL-based detection of a 20-mer microRNA. The sensor has a linear response in the 0.1 fM to 0.2 pM microRNA concentration range and a detection limit as low as 33 aM. The assay has been applied to the determination of microRNA spiked in serum samples, and recoveries ranged from 94.4 to 100.5%.
A novel electroluminescence biosensor based on the amplification of target cyclic regeneration is described. It is achieved by using a system of hairpin DNA probes, primers, and Klenow fragment of DNA polymerases combined with CdTe QDs and Au NPs, and was successfully applied to microRNA detection.
研究领域:
生物传感器
·
癌症研究
·
纳米技术
·
分子诊断
·
电化学
✓ 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）