Desalination and Water Treatment
·
2015
·
IF 1.173
Yumei Zhang,Lan Yang,Dongtian Wang,Tao Zhang
For resource utilization, water treatment residual sludge (WTRS) and its cerium-modified product (Ce-WTRS) were used as adsorbents to remove F− from aqueous solution. The adsorbent materials were characterized by energy dispersive X-ray, scanning electron microscope, X-ray diffraction, Fourier transform infrared, and specific surface area test techniques. Different experimental conditions such as pH, initial F− concentration, contract time, and temperature were investigated. The appropriate adsorption capacity was achieved in the pH range of 3–9. Adsorption kinetics, isotherm, and thermodynamic studies were used to illustrate the nature of F− onto adsorbents materials. Good fitting of pseudo-second-order kinetics model indicated the chemisorption nature. Further analyses of intra-particle diffusion model were carried out to determine the rate controlling step. It was found that the Langmuir and Temkin isotherm models fitted the experimental data better. The maximum adsorption capacity (qm) determined by Langmuir isotherm model was 15.45 mg/g for Ce-WTRS, 22% higher than WTRS. The negative values of ΔGθ indicated the feasibility and spontaneity of material-fluoride interaction. ΔHθ >0 for Ce-WTRS demonstrated the endothermic nature, while ΔHθ <0 for WTRS suggested an exothermic procedure. Ion exchange and complex reaction were identified as the main mechanism of fluoride adsorption.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Applied Spectroscopy
·
2017
·Vol. 84
·期 5
·900-905
·
IF 0.572
Zhao Zh.,Sheng L.,Su B.,Tao C.,Jing W.
The interaction between rhodamine 6G (Rh6G) and cerium sulfate was studied by the fluorescence quenching method. In a sulfuric acid medium, the interaction of Ce(IV) with Rh6G results in Rh6G fluorescence quenching. The maximum excitation wavelength (λ ex ) and the maximum emission wavelength (λ em ) are 530 nm and 555 nm, respectively. A good linearity between the relative fl uorescence intensity (ΔF) and Ce(IV) was observed in the range ~0.12–1.08 μg/mL. The detection limit was 1.4 × 10 –3 μg/mL. The optimum reaction conditions, influencing factors, and effect of coexisting substances were investigated in the experiment. We found that the concentration of Rh6G was 3.2 × 10 –6 mol/L, and the fl uorescence intensity was maximum.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 74
·70303-70310
·
IF 3.289
Hongxing Zhang,Yiwei Zhang,Yuming Zhou,Chao Zhang,Xiaoli Sheng,Shuo Zhao,Jiasheng Fang,Mingyu Zhang
This article reports a facile and controllable one-step method to construct Pt@hollow mesoporous SiO2 (Pt@HMSiO2) nanoparticles (NPs). To enhance the catalytic activity, cerium species were impregnated into Pt@HMSiO2 NPs, fabricating highly reactive Pt–CeO2@HMSiO2 NPs. To verify the successful synthesis of the Pt@HMSiO2 and Pt–CeO2@HMSiO2 NPs, and study the influence of CeO2 species on the catalytic performance, the as-prepared NPs were characterized by several techniques, including SEM, TEM, EDX, FTIR, XRD, BET and UV-vis analyses. In this work, the reduction of 4-NP was employed as a model reaction to test the catalytic performance. Compared to Pt@HMSiO2, the Pt–CeO2@HMSiO2 NPs show higher catalytic activity, because of the co-catalysis of CeO2 NPs. However, the excess amount of CeO2 NPs would lead to a lower catalytic activity, due to the blocking of the catalyst pore. In addition, the Pt–CeO2@HMSiO2 NPs show a high thermal stability due to the protection of the SiO2 shell. Meanwhile, we have also used the reaction of propane dehydrogenation to further verify the excellent catalytic stability of Pt–CeO2@HMSiO2 NPs. This strategy is novel, albeit efficient, and can be extended to the preparation of other nanocatalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Lili Liu,Yangyang Pu,Yao Lu,Na Li,Zhaoxia Hu,Shouwen Chen
Towards the breaking of the “trade-off” between proton conductivity and stabilities of sulfonated poly(aryl ether sulfone) (SPAES)-based proton exchange membranes, a strategy of compositing with the superacids of sulfated SnO 2 (ST) and SnO 2 -xCeO 2 (CSTx) is designed and carried out. The superacids of ST and CSTx have been synthesized by sulfonation of SnO 2 with sulfuric acid and subsequently doped with CeO 2 . By the solution casting approach, the composite membranes are obtained in a homogenous state and show excellent mechanical strength , thermal, dimensional and chemical stability. ST or CSTx in the composite membranes provides excess active sites and forms additional proton-conducting channels by a network of hydrogen bonds . Although with low IEC levels, all the composite membranes show larger water absorption and proton conductivity than the control SPAES membrane. As a result, the SPAES-2CST3 membrane achieves a power output of 673.6 mW/cm 2 at 80 °C, which is higher than the control membrane (481.8 mW/cm 2 ). The durability of the SPAES-2CST3 membrane under accelerated stress test conditions is significantly enhanced compared to the control SPAES membrane, and the aged SPAES-2CST3 membrane exhibits lower hydrogen crossover and better cell performance than the aged control SPAES membrane.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Dan Li,Guannan Wang,Liming Cheng,Cuiping Wang,Xifan Mei
Aggregation-induced emission has provided fluorescence enhancement strategies for metal nanoclusters. However, the morphology of the aggregated nanoclusters tended to be irregular due to the random aggregated route, which would result in the formation of an unstable product. Herein, copper nanoclusters were directly synthesized by using l-cysteine as both the reducing and protection ligand. Initially, the structure of the product was irregular. Furthermore, Ce3+ was introduced to re-arrange the aggregates through a crosslinking avenue. It was interesting to find that well-ordered three-dimensional nanomaterials with mesoporous sphere structures were obtained after re-aggregation. On the basis of the stability test at a relatively high temperature and the light-emitting diode fabrication investigation, it revealed that the regulated product demonstrated more promising stability and color purity for practical applications than the random aggregated product with irregular structures.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Zhipan Wen,Jun Ke,Jinlei Xu,Sheng Guo,Yalei Zhang,Rong Chen
Toxic heavy metals As(V) and Cr(VI) removal from water environment has becoming more and more urgent due to their adverse health effect. In this study, the flowerlike Ce/Fe bimetallic oxides (CFBO), which combined the superiority of three-dimensionally (3D) hierarchical architectures and bimetallic synergistic effect, were innovatively designed and synthesized via one-step facile template-free hydrothermal method. Compared with pure iron oxides (PIO), the obtained CFBO exhibited excellent performance for As(V) and Cr(VI) removal, and the maximum adsorption capacities toward As(V) and Cr(VI) increased from 49.09 mg/g to 164.94 mg/g and 38.07 mg/g to 127.42 mg/g, respectively. Both As(V) and Cr(VI) removal efficiency decreased with an increasing solution pH due to the pH zpc of CFBO, but exhibited slightly change with coexisting anions except for SiO 3 2− and PO 4 3− ions. Combined results of FT-IR and XPS, it was concluded that the abundant hydroxyl groups existed on the surface of CFBO played a key role in the high uptake of As(V) and Cr(VI), and subsequently formed inner-sphere surface complexes. Attractively, the remarkable removal efficiency of As(V)/Cr(VI) in column experiments revealed that the CFBO had great potential for practical application.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Jie Peng,Jie Jiang,Shuoguo Yuan,Pengfei Hou,Jinbin Wang
Ferroelectric materials are ideal for self-powered sensors in Internet of Things (IoT) and high-precision detection systems due to their excellent polarization properties. Compatibility with miniaturization, high-density systems, and complementary metal oxide semiconductor (CMOS) processes is crucial for their widespread adoption. HfO 2 -based ferroelectric films show potential in self-powered pyroelectric sensors as their thinness enables effective temperature and light detection. However, the disordered ferroelectric domain distribution limits their pyroelectric performance and hampers the development of highly integrated self-powered pyroelectric devices. This report investigates the temperature and light detection capabilities of Ce-doped HfO 2 ferroelectric films, which exhibit as-grown spontaneous polarization in the downward direction, making them a promising option for self-powered pyroelectric sensors. The findings provide robust evidence that the introduction of a temperature gradient significantly enhances pyroelectricity. In addition, their applications in the detection of hot/cold wind and breathing have been proved. Notably, the 30 nm thick Ce-doped HfO 2 ferroelectric film has a high pyroelectric coefficient of about 894.7 μC·m −2 ·K −1 and enables high-precision detection of changes in temperature of 0.1 K. This study highlights the potential application of HfO 2 -based ferroelectric films in self-powered sensors with temperature and light detection capabilities, making them a promising candidate for future IoT-based systems and high-precision detection systems.
研究领域:
材料科学
·
传感器技术
·
物联网
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Wenjun Zhang,Mingwei Zhang,Linlin Liu,Songzu Tang,Li Wang,Xiangwen Zhang,Guozhu Li
Preparation of robust catalysts with high isomer yield still poses challenges for efficient hydroisomerization of long-chain n-alkanes. ZSM-48 is a competitive candidate for a support due to its unique one-dimensional pore structure. However, its excessive acidic sites lead to serious cracking side reactions. Herein, a facile one-pot in situ method of trace cerium doping in ZSM-48 is developed, and the acidity property and structure of ZSM-48 are finely tuned by changing the Ce content. Compared with traditional ZSM-48, Ce-doped ZSM-48 has smaller specific surface area and microporous volume, and the concentration of strong Brønsted acid sites is effectively adjusted. Pearson correlation coefficients between the properties of ZSM-48 zeolite regulated by different amounts of Ce and the catalytic hydroisomerization performance of Pt/ZSM-48 are calculated, which demonstrate that strong Brønsted acid sites of ZSM-48 are significantly correlated with n-hexadecane isomerization yield. ZSM-48 doped with 0.41 wt% Ce with appropriate concentration of Brønsted acid sites shows superior hydroisomerization performance, reaching an iso-hexadecane yield of 87.0%.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2025
·
IF 2.5
Zhao Chun-Yan,Hu Xiu-Li,Zhou Wei
Calcium looping represents a high-temperature method designed to capture CO 2 , making it appropriate for CO 2 capture from flue gases post-combustion in power plants after combustion or for integration with fuel transformation techniques in pre-combustion CO 2 sequestration systems. This method employs solid sorbents of CaO sourced from natural limestone, leveraging the chemical interaction of CaO with CO 2 , which ultimately results in the formation of CaCO 3 , thereby facilitating effective CO 2 capture. In this research, multiple metal-incorporated CaO-based sorbents were produced through the sol–gel method. Notably, the CaO-based sorbent with a Ca/Ce doping ratio of 15 demonstrates exceptional CO 2 capture ability and stability, maintaining 13.20 mmol/g of CO 2 adsorption capacity after 20 carbonation/calcination cycles. Various characterization techniques, including X-ray diffraction (XRD), N 2 physisorption, scanning electron microscopy (SEM), high-angle annular dark field scanning transmission electron microscopy/energy dispersive spectroscopy (HAADF-STEM/EDS), temperature-programmed-desorption with CO 2 (CO 2 -TPD), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) are employed to demonstrate that the presence of nanoscale CeO 2 significantly enhanced the diffusion of CO 2 during the adsorption process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
You Zhang,Kun Zhao,Haoyu Zhu,Qiong Xi,Nian Fu,Dawei Wang,Jinxing Zhao,Li Guan,Yunfei Zhuang,Xu Li
White light-emitting diodes (WLEDs) have emerged as a leading technology for healthy lighting and advanced displays. Nevertheless, the poor thermal stability of blue-emitting components remains a significant bottleneck, hindering their broader adoption in demanding environments. Here, we have prepared a series of Ca 3 Al 2 O 6 :Ce 3+ phosphors by high temperature solid-state method. Substituting the [Al 3+ –O 2- ] ionic pair with [Si 4+ –N 3- ] in the Ca 3 Al 2 O 6 host lattice via a charge-compensated strategy achieves a 1.75 times enhancement in thermal stability compared to the pristine material, while simultaneously inducing a blue-shifted emission spectrum (Δλ = 30 nm). The enhanced thermal stability originates from increased lattice rigidity, while the blue spectral shift arises from modulated crystal field splitting decrease. These mechanistic insights provide a foundational strategy for designing ultra-stable blue phosphors compatible with high-power WLED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·184-194
·
IF 3.97
Qiuyun Zhang,Binbin Yang,Yuanyuan Tian,Xianju Yang,Rongfei Yu,Jialu Wang,Taoli Deng,Yutao Zhang
In the present study, a facile solvothermal method was used for the synthesis of silicotungstic acid (HSiW) immobilized on Ce-based metal organic framework (Ce-BDC) and embedded in Zr-based metal-organic framework (UiO-66(Zr)) composite catalyst, namely, Ce-BDC@HSiW@UiO-66 for the production of biodiesel through green fatty acid esterification. The obtained hybrids were characterized by various characterization technologies, including Fourier transform infrared, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 physisorption, X-ray photoelectron spectroscopy, and temperature-programmed desorption of NH 3 (NH 3 -TPD) analysis. The characterization analyses showed that the hybrids have been successfully synthesized. Also, the volume and pore size of UiO-66(Zr) were changed by introducing HSiW@Ce-BDC, and the resulting Ce-BDC@HSiW@UiO-66 possessed the mesoporous structure and relatively high surface area. Simultaneously, the NH 3 -TPD analysis of Ce-BDC@HSiW@UiO-66 reveals that the acid strength was increased in comparison with HSiW@Ce-BDC. In addition, the composite Ce-BDC@HSiW@UiO-66 demonstrated high catalytic activity, and the oleic acid esterification gave 81.5% conversion at optimum conditions of 0.2 g catalysts, 1:30 oleic acid to methanol molar ratio at 130°C for 4 h. More interestingly, after six recycling cycles, the reduction in the conversion rate was only 4.6%, indicating that Ce-BDC@HSiW@UiO-66 has excellent reusability. Our study provides an effective approach to synthesize multifunctional hybrids for green biofuel production.
研究领域:
化学工程
·
催化材料
·
可再生资源
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Yang Wang,Baoyu Gao,Shuya Li,Bo Jin,Qinyan Yue,Zhining Wang
Cerium oxide (CeO 2 ) nanoparticles (NPs) have indicated great potentials as nanofiller owing to its high surface area, antioxidant properties and low cost. In this paper, thin film nanocomposite (TFN) RO membranes were proposed to be prepared through incorporation of hydrophilic CeO 2 NPs in polyamide (PA) selective layers via interfacial polymerization (IP). EDX, XPS , SEM , AFM, contact angle and zeta potential were used to examine the property and morphology of the prepared membranes. CeO 2 NPs were successfully embedded in the PA network, which endowed the TFN membranes with rougher surfaces and thinner PA layers. The TFN membranes were fabricated with different CeO 2 NPs contents (0, 50, 100, 150, 200, 400 mg/L). With increasing CeO 2 NPs loading amount, the hydrophilicity improved from 85.4° to 65.7° and the surface charge declined from −19.4 to −34.2 mV. These characteristics contributed to a 50% enhancement in water flux of TFN-CeO 2 100 membrane (containing 100 mg/L of CeO 2 NPs) without compromise the NaCl rejection (98%). Moreover, CeO 2 embedded membrane exhibited an enhanced fouling resistance property through preventing the adhesion of hydrophobic foultants. This study demonstrated the desirable applicability of CeO 2 NPs in synthesizing novel TFN membranes for desalination application.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 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）