RSC Advances
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2024
·Vol. 14
·期 14
·10056-10069
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IF 3.9
Fengqin Tang,Hui Bai,Yahui Chen,Chunhui Shi,Dong Wang,Yaju Zhang,Wenyuan Liu,Ling Yang,Libing Hu
The requirement for the removal of phosphorus (P) from wastewater has become progressively stringent, therefore, it is essential to remove low-concentration phosphate from secondary effluents through a tertiary treatment. One of the biggest challenges in removing phosphate from wastewater is the development of low-cost, green, and pollution-free adsorbents. In this study, novel, eco-friendly and low-cost CeO2 nanosphere modifying CoAl-LDH nanosheets (CoAl-LDH/CeO2) were successfully fabricated using a classical hydrothermal strategy. The microstructure and morphology of CoAl LDH/CeO2 were characterized using SEM, TEM, FTIR, XRD, TG, XPS, and BET techniques. The performance of the P adsorption from water for CoAl-LDH/CeO2 was investigated. The influences of adsorption parameters, such as adsorbent dosage, pH, phosphate concentration, adsorption time, and experimental temperature, were investigated through batch adsorption experiments. The batch adsorption experiments showed that the P removal by CoAl-LDH/CeO2 could reach 93.4% at room temperature within 60 minutes. CoAl-LDH/CeO2 showed ultrafast and high-efficiency adsorption for low concentration P contaminated wastewater. Pseudo-second order model exhibited better fitting with the kinetics of the phosphate adsorption, while the Freundlich model well-described the isotherm results (R2 > 0.999). Although Cl−, NO3−and SO42− coexisted in the solution, CoAl-LDH/CeO2 still possessed favourable selectivity for phosphates. More importantly, the adsorption capacities of CoAl-LDH/CeO2 retained over 85% after five cycles. Therefore, the low cost and sustainable utilization of CoAl-LDH/CeO2 for the phosphate removal from secondary effluent with phosphate at a low concentration highlights its potential application to alleviate eutrophication.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2024
·
IF 2.4
Yuzhen Zhao,Yongle Wu,Xiangke Jiao,Ruijuan Yao,Zhun Guo,Jianjing Gao,Yang Zhao,Dong Wang
In this manuscript, the triple-layer PDLC device with progressive driving function was prepared by integrating three single-layer PDLCs with different electro-optical properties. In comparison with conventional single-layer PDLC, triple-layer PDLC is capable of achieving controllable transmittance by regulating the applied voltage under low-voltage conditions. The optimal ratio and polymerisation conditions were explored by introducing oleic acid modified CeO2 nanospheres and adjusting the polymerisation temperature as well as the UV light intensity. It was found that the polymer network morphology was affected by CeO2 nanospheres content, polymerisation temperature, and UV intensity, which led to changes in the electro-optical properties of the triple-layer PDLC. The samples obtained under the optimal ratio and process conditions exhibited a 77% acceleration in rise response time (ton) compared to the original conditions, while still maintaining excellent progressive driving performance. Its potential for application in the field of intelligent display windows has been significantly enhanced by these advantages.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Xuan Zhang,Nan Hao,Shucheng Liu,Kai Wei,Changchang Ma,Jianming Pan,Sheng Feng
Methyl paraoxon (MP) is a highly toxic, efficient and broad-spectrum organophosphorus pesticide , which poses significant risks to ecological environment and human health. Many detection methods for MP are based on the enzyme catalytic or inhibition effect. But natural biological enzymes are relatively expensive and easy to be inactivated with a short service life . As a unique tool of nanotechnology with enzyme-like characteristics, nanozyme has attracted increasing concern. However, a large proportion of nanozymes lack the intrinsic specificity, becoming a main barrier of constraining their use in biochemical analysis. Here, we use a one-pot reverse microemulsion polymerization combine the gold nanoclusters (AuNCs) with molecularly imprinted polymers (MIPs), polydopamine (PDA) and hollow CeO 2 nanospheres to synthesize the bright red-orange fluorescence probe (CeO 2 @PDA@AuNCs-MIPs) with high phosphatase-like activity for selective detection of MP. The hollow structure possesses a specific surface area and porous matrix, which not only increases the exposure of active sites but also enhances the efficiency of mass and electron transport . Consequently, this structure significantly enhances the catalytic activity by reducing transport distances. The introduced MIPs provide the specific recognition sites for MP. And Ce (III) can excite aggregation induced emission of AuNCs and enhance the fluorescent signal. The absolute fluorescence quantum yield (FLQY) of CeO 2 @PDA@AuNCs-MIPs (1.41 %) was 12.8-fold higher than that of the GSH-AuNCs (0.11 %). With the presence of MP, Ce (IV)/Ce (III) species serve as the active sites to polarize and hydrolyze phosphate bonds to generate p -nitrophenol (p-NP), which can quench the fluorescent signal through the inner-filter effect. The as-prepared CeO 2 @PDA@AuNCs-MIPs nanozyme-based fluorescence method for MP detection displayed superior analytical performances with wide linearities range of 0.45–125 nM and the detection limit of 0.15 nM. Furthermore, the designed method offers satisfactory practical application ability. The developed method is simple and effective for the in-field detection.
研究领域:
环境科学
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分析化学
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纳米技术
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DOI
PubMed
高影响因子
Molecular Catalysis
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2024
·
IF 3.9
Mingzhen Huang,Jinxin He,Kaiji Xu,Dongren Cai,Guowu Zhan
The supported Pt/CeO 2 catalysts are widely used for the catalytic oxidation of CO at ambient conditions. Herein, we reported a new strategy for modifying the interaction between Pt and CeO 2 support via pulsed steam treatment, which significantly optimized the catalytic performance of Pt/CeO 2 for CO oxidation. Specifically, the hollow CeO 2 nanospheres were prepared by using carbon spheres as sacrificial templates and then subjected to pulsed steam treatment at 150 °C for different times to obtain the CeO 2 -xH support (x means the time of pulsed steam treatment, min). It was found that the complete oxidation of CO can be achieved at 90 °C over the Pt/CeO 2 –50H sample, which was much lower than that (130 °C) on Pt/CeO 2 without pulsed steam treatment. The XPS and in-situ DRIFTS characterizations were conducted to reveal the high performance of the Pt/CeO 2 –50H catalyst for CO oxidation. It was found that the valence state of Pt significantly controlled by pulsed steam treatment was critical to the catalytic activity, whereby the presence of two types of active sites (Pt 0 -CO and Pt δ+ -CO) over Pt/CeO 2 –50H greatly promoted the combination of adsorbed CO and O 2 to generate CO 2 . Accordingly, this study provides a facile method to regulate the Pt valence state by pulsed steam treatment for CeO 2 support, which is critical to the CO oxidation activity.
研究领域:
催化化学
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材料科学
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环境科学
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DOI
高影响因子
FUEL
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2022
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IF 8.035
Ming Jiang,Xiaopeng Chen,Linlin Wang,Jiezhen Liang,Xiaojie Wei,Weijian Nong
Lignin is the most abundant renewable aromatic resource in nature; thus, the development of an efficient and economical catalysts that can depolymerize lignin into value-added aromatic monomers is highly desirable. Here, we report a single-atom Ni catalyst ( x Ni/CeO 2 -S, where x represents the Ni loading), in which the single-atom Ni sites are anchored to the oxygen vacancies on CeO 2 nanospheres, for the conversion of cellulolytic enzyme lignin (CEL) via depolymerization and hydrodeoxygenation. The 1.0Ni/CeO 2 -S catalyst performed the best, achieving a lignin oil (LO) and maximum monomer yield of 84.3 wt% and 32.6 wt%, respectively; a higher heat value of 31.64 MJ/Kg is achieved for LO compared to 23.03 MJ/Kg for CEL. Thus, single-atom nickel catalyst exhibited excellent activity and stability in promoting the depolymerization of lignin. These results validate the viability of single-atom metal catalysts for the conversion of lignin resources.
研究领域:
催化化学
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可再生资源利用
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材料科学
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DOI
高影响因子
ChemPlusChem
·
2015
·Vol. 80
·期 5
·886-894
·
IF 3.026
Hongxiao Yang,Yue Pan,Yucong Xu,Yanzhao Yang,Guoxin Sun
Graphical Stuck in the middle : A series of copper-modified ceria catalysts has been synthesized in a facile way. (CuO) x /Ce 0.9 Cu 0.1 O 2 showed excellent catalytic activity in CO low-temperature oxidation. The combined contribution of the synergistic effect and surface defects facilitates the CO oxidation at the interface between ceria and copper species (see scheme). Copper-modified ceria catalysts, (CuO) x /Ce 0.9 Cu 0.1 O 2 nanospheres, for low-temperature CO oxidation were fabricated simply by using the hydrothermal synthesis of Cu-doped CeO 2 (Ce 0.9 Cu 0.1 O 2 ) nanospheres followed by deposition of CuO over Ce 0.9 Cu 0.1 O 2 . The X-ray diffraction and electron spectroscopy characterizations demonstrated that the as-prepared nanospheres were composed of cubic CeO 2 and monoclinic CuO with a typical diameter of around 70 nm. Moreover, the X-ray photoelectron spectroscopy (XPS) analysis illustrated the coexistence of Ce 4+ /Ce 3+ and Cu 2+ /Cu + redox couples in (CuO) x /Ce 0.9 Cu 0.1 O 2 and H 2 temperature-programmed reduction (TPR) measurements indicated the excellent reduction behavior of the catalyst. The Raman spectra illustrated the oxygen vacancy in (CuO) 0.3 /Ce 0.9 Cu 0.1 O 2 , and diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) demonstrated the stable existence of Cu + species during CO oxidation. The (CuO) x /Ce 0.9 Cu 0.1 O 2 nanospheres showed excellent catalytic activity toward CO oxidation in normal feed gas (volume ratio of CO/O 2 /N 2 =1:10:89) at ambient temperature. Catalytic tests revealed that the proportion of CuO in the final product has a strong influence on the resultant catalytic activities. The (CuO) x /Ce 0.9 Cu 0.1 O 2 nanospheres hold great application potential as new catalysts for CO oxidation.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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