ELECTROPHORESIS
·
2012
·Vol. 33
·期 11
·1589-1594
·
IF 3.303
Lin Wang,Ying Liu,Haoyue Xie,Zhifeng Fu
A transition metal chelate unstable at a high oxidation state, diperiodatocuprate (III) (K 5 [Cu(HIO 6 ) 2 ], DPC), was synthesized and applied in the luminol-based chemiluminescence (CL) system for highly sensitive CE end-column detection of dopamine (DA). This method was based on the fact that DA enhanced the CL emission resulting from the reaction between luminol and DPC in alkaline medium. The DPC-luminol-DA CL system showed very intensive emission and very fast kinetic characteristics, thus resulting in a high sensitivity in flow-through detection mode for CE. Under optimal conditions, the linear range was 1.0 × 10 −8 –5.0 × 10 −5 g/mL ( R 2 = 0.9984) with a limit of detection of 6.0 × 10 −9 g/mL (S/N = 3). The RSDs of the peak height and the migration time were about 4.2 and 2.4% for a standard sample at 3.0 × 10 −6 g/mL ( n = 5), respectively. The presented method has been successfully used for the determination of DA in commercial preparation and human urine samples after clean-up using SPE.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xi Chen,Xiaoyan Wang,Ziliang Jia,Chao Yang,Zhihong Liu,Yuexing Wei,Mengxue Wang,Meisheng Liang
K-doped Mn–Ce solid solution catalysts were synthesized using a combination of coprecipitation and hydrothermal methods, demonstrating excellent performance in benzene oxidation. The catalyst K 1 Ce 5 Mn 5 exhibited comparable activity to noble metal catalysts, achieving a 90 % benzene conversion at approximately 194 ℃. Durable tests under dry and moist conditions revealed that the catalyst could maintain its activity for 50 h at 218 ℃ and 236 ℃, respectively. Characterization results indicated that the catalyst’s enhanced activity resulted from the weakened Mn–O bonding caused by the introduction of K + , facilitating the activation of oxygen and its involvement in the reaction. CeO x , the main crystalline phase of Mn–Ce solid solutions, provided abundant oxygen vacancies for capturing and activating oxygen molecules for the weakened Mn–O structures. This conclusion was further supported by partial density of state analysis from density functional theory computations, revealing that the introduction of K + weakened the orbital hybridization of Mn3d and O2p. Finally, in situ diffuse reflectance infrared Fourier-transform spectroscopy ( in situ DRIFTS) studies on Ce 5 Mn 5 and K 1 Ce 5 Mn 5 catalysts suggested that the introduction of K + promoted the conversion of adsorbed benzene. Furthermore, intermediate products were transformed more rapidly for K 1 Ce 5 Mn 5 compared to Ce 5 Mn 5 .
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaocong Liu,Yi Wang,Fuping Zhang,Bo Xing,Guo Yang,Kaibin Zhang,Xingyong Liu,Yan Huang,Min Li,Mingliang Wu
Widespread and ineffective dye treatment in aquatic environment leads to serious pollution problems, threatening ecology and human health. Herein, manganese cerium bimetallic oxide cathode material (MnCeO x @GF) was prepared by hydrothermal method combined with calcination, and the electrochemical Fenton degradation performance of a typical dye Rhodamine B (Rh B) was investigated. The results show that the degradation of Rh B by MnCeO x @GF can reach 96.5 % within 2 h in acidic environment and continue to perform effectively after 4 repeated experiments. Combined with SEM and electrochemical test results, it can be seen that the bimetallic composite oxides formed by manganese and cerium on the surface of the support can effectively enhance the catalytic activity of the material, the addition of cerium changes the morphology of manganese oxides and promotes the generation of multiple valence composite oxides of transition metals, and improves the degradation of Rh B. Based on the free radical masking experiments, hydroxyl radical (·OH) is the main active substance in the electro-Fenton degradation process. This work not only provides a way to design and manufacture cathode materials for in situ electrosynthesis of H 2 O 2 , but also provides an important reference for improving the reusability of cathodes for sustainable dye wastewater treatment.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 8
·e7556
·
IF 3.7
Muhammad Jawad Ahmad,Xue Lu,Liye Liang,Guangming Li
Since catalytic chemoselective reduction of corresponding nitroarenes is a significant route to produce functionalized anilines, developing inexpensive and highly active catalyst is imperia. Herein, the Co-Ce-H 2 salen-hmta composite was first prepared by grinded completely the mixture of Co-H 2 Salen and hexamethylenetetramine (hmta) in 1:1 mol ratio in a mortar. The 3d–4f hetero-metal Co-Ce-H 2 salen coordination polymer acted as a support precursor and hmta provided the nitrogen source. Then, a target catalyst of Co/NC-CeO 2 -hmta were afforded by pyrolysis of Co-Ce-H 2 salen-hmta composite at 800°C in the presence of argon atmosphere. When the target catalyst of Co/NC-CeO 2 -hmta and reference catalysts were applied for the hydrogenation of nitroarenes under N 2 H 4 , the target catalyst of Co/NC-CeO 2 -hmta exhibited better performance than reference catalysts in terms of conversion, yield, selectivity, and recyclability. Spectral analysis suggested that the high catalytic performance of a target catalyst of Co/NC-CeO 2 -hmta were attributed to highly dispersed metallic Co 0 , rich oxygen vacancies, and nitrogen-doped carbon matrix.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jing-Rui Zhang,Fa-Qiang Zhong,Lu-Bing Zhong,Zheng-Jun Dong,Quan-Bao Zhao,Zhimin Ao,Darren Delai Sun,Jia-Cheng E. Yang,Yu-Ming Zheng
An unprecedented type of 3D porous millimetric ozonation catalyst confining Mn-Ce dual-atom sites in terracotta support (MCT) was hereby reported through a feasible interface oxygen-induced ordering strategy. The utilization of cerium tailored the electron/valence state of dual-atom sites through its oxyphilic 4 f orbitals, making MCT present excellent ozone catalysis to remove model recalcitrant fulvic-like acids. The TOC removal kinetics value by MCT is 2.71 and 3.68 times higher than those of catalysts confining single Mn and Ce sites, respectively. The optimized MCT exhibited robust reusability without any regeneration (above 87% of TOC removal for each cycle), and desirable removal for the biochemical effluent organics of landfill leachate, showcasing a potential of deeply purifying saline wastewater. The electron complementary effect of cerium in dual-atom sites accelerated the electron transfer for O 3 catalysis, thus promoting the formation of reactive radicals for pollutant degradation via a thermodynamically feasible surface-adsorbed oxygen pathway. This work highlights the importance of elaborately designing dual-atom metal sites to construct reusable monolithic ozonation catalysts with electron self-cycle function for advanced wastewater purification.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qiao Zhang,Chunxi Hai,Zhiqiang Zhu,Xuemei Zhuo,Yanxia Sun,Shengde Dong,Luxiang Ma,Xin He,Qi Xu,Yuan Zhou
The layer-structured titanium oxide lithium ion sieve (TiO 2 ·H 2 O) is regarded as one of the most promising adsorbents for recovering Li + from low-grade brines with high Mg 2+ /Li + ratios and low lithium concentrations. This is due to its exceptional theoretical lithium adsorption capacity and outstanding stability. Nevertheless, its prolonged adsorption equilibrium time, frequently in excess of 72 h, has constrained its large-scale practical application, thus confining its utilization primarily to laboratory settings. To address this challenge, we have developed a Ce-doped TiO 2 ·H 2 O adsorbent through a simple in-situ calcination method. The as-prepared adsorbents have been shown to achieve a high adsorption capacity of up to 58.42 mg/g within 10 h in a 700 ppm LiOH solution, while exhibiting a very low Ti 4+ dissolution loss rate of around 0.6 %. It is noteworthy that the Ce doping process resulted in a 14 % enhancement in adsorption capacity, accompanied by a substantial improvement in the desorption/adsorption kinetics and selectivity of the TiO 2 ·H 2 O lithium adsorbents. In summary, this study presents a novel methodology for accelerating the Li + sorption in Ti–O frameworks derived from natural brines, which provides valuable insights for enhancing the practical applicability of TiO 2 ·H 2 O.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zijun Yang,Xuexue Yin,Zixuan Wang,Bing Sha,Lingzhan Miao,Jun Wu,Guoxiang You,Jun Hou
This paper presents the synthesis of a cost-effective, environmentally friendly, and highly efficient Cerium (Ce)-based polyvinyl alcohol/tannin hydrogel adsorbent modified with triethylene tetramine (Ce-PVA/TA/TETA). This material integrates components with exceptional phosphate affinity, making it ideal for phosphate removal applications . Specifically, the hydrogels were firstly prepared by using tannin and polyvinyl alcohol as raw materials. Subsequently, after H 3 BO 3 as crosslinking, the Ce was loaded into hydrogel by co-precipitation and Ce-PVA/TA was modified by triethylene tetramine amine to obtain Ce-PVA/TA/TETA with high adsorption efficiency and high selectivity. Triple modification with tannin hydrogelation, Ce loading and amination can significantly improve the affinity of the material to phosphate. This allows the Ce-PVA/TA/TETA hydrogel to maintain high phosphate adsorption capabilities across a wide pH range of 3.0–12.0. The Ce-PVA/TA/TETA hydrogel achieved a maximum phosphorus adsorption capacity of 110.88 mg/g within an equilibrium time of 120 min at 25 °C and pH = 3.0. The presence of co-existing ions had impact on phosphate adsorption. Both the pseudo-second-order model and the Langmuir model effectively described the kinetics and isotherms, respectively . The adsorption process was a monolayer chemical adsorption, which was dominated by the surface adsorption and particle internal diffusion. Besides electrostatic attraction, ligand exchange and internal diffusion mechanisms were involved in the phosphate adsorbing of Ce-PVA/TA/TETA based on Zeta potential, FTIR, and XPS analysis. Most importantly, the Ce-PVA/TA/TETA hydrogel can swiftly remove phosphate from natural water and wastewater at low doses, meeting regulatory standards. This underscores its promising potential for phosphate management and eutrophication control.
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 12
·e202500499
·
IF 2
Tianzhu Shao,Qi Wang,Jiahao Wei,Gonggang Sun,Xinbao Li
Graphical The study focuses on the synthesis of SCR catalysts with high activity and excellent alkali resistance. The redox performance and surface acidity of VWTi are enhanced and the atomic valencies is optimized through the doping of Ce and Bi. Therefore, the catalytic activity of the catalyst is significantly enhanced and excellent catalytic activity is maintained even after KCl poisoning. Ce-doped V 2 O 5 -WO 3 /TiO 2 (CeVWTi) and its subsequent modifications have been recognized as effective catalysts for the selective catalytic reduction of NO. Herein, CeVWTi catalysts doped with varying amounts of bismuth sulfate (Bi 2 (SO 4 ) 3 ) were synthesized and evaluated for their activity and alkali resistance. These catalysts were characterized using XPS, BET, SEM, H 2 -TPR, NH 3 -TPD, and XRD techniques. The optimal doping level of Bi 2 (SO 4 ) 3 was 1 wt.%. The NO conversion rate of the catalyst co-doped with Ce and Bi was 71.6% under the reaction conditions of 300 °C, gas hour space velocity (GHSV) = 200,000 h −1 with a gas composition of 550 ppm NO, 550 ppm NH 3 , 5.6% O 2 , and N 2 as the balance. The NO conversion efficiency of the Bi 0.01 CeVWTi catalyst was maintained at 90.7% after the addition of 1 wt.% KCl poisoning under the reaction conditions of 350 °C, GHSV = 200,000 h −1 , 550 ppm NO, 550 ppm NH 3 , 5.6% O 2 , and N 2 as the balance. Characterization showed that, despite the reduction in the specific surface area of the catalyst and some acidic sites due to Bi doping, the redox performance of Bi 0.01 CeVWTi was significantly enhanced. The excellent redox performance was maintained even after KCl poisoning.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Haiying Xin,Liyan Xue,Mengtong Ma,Ke Song,Qiyong Deng,Zhiyi Wang,Minzhong Huang,Fan Yang
To mitigate the urban heat island effect, align with the “double carbon strategy”, and address the issues of coating aging and mildew on building facades, multifunctional ternary entropy-regulatory tungstate ceramic cool pigments (Ce x Ho 0.1 Gd 1.9– x W 2 O 9+ δ ) were prepared by high-temperature solid-phase method in this study. While ensuring the high near-infrared (NIR) solar reflectance, the anti-ultraviolet (UV) aging and antimycotic performance of rare earth given to pigment were evaluated, and its optical properties, microstructure and practical application effects were deeply explored. The results indicate that ternary entropy regulation changes the color of the pigment from white to yellow, significantly reducing the band gap from 3.28 to 1.90–1.87 eV. Specifically, the Ce 0.2 Ho 0.1 Gd 1.7 W 2 O 9+ δ pigment exhibits excellent chromatic properties ( L * = 73.79, a * = 20.21 and C * = 50.51) and a high NIR solar reflectance (96.23%). Infrared thermography confirms that it has a good cooling effect, with temperatures of 3.5 °C lower than the commercially available coating of similar color. Furthermore, the performance of multifunctional integration is that the pigments show enhanced absorption in the UVA (long-wave ultraviolet 320–400 nm) range, with an increase in average light absorption from 0.19 to 0.91 and a substantial increase in antimycotic rate from 42.86% to 97.46%. At the same time, this material has good acid and alkali resistance (Δ E * ≤ 2.41). The successful development of the multifunctional cool pigment materials opens a new way to energy-saving architectural wall coating materials.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lei Dong,Yangyang Yuan,Shengjie Zhu,Peidong Li,Xiaomin Zhang,Yanping Chen,Lei Xu
Direct synthesis of dimethyl carbonate (DMC) using CO2 and methanol as raw materials is an environmentally friendly and promising route for recycling carbon sources from exhaust gases. Herein, well-constructed CeO2-based nanoparticle catalysts promoted by various Fe contents were synthesized via a facile co-precipitation method and demonstrated to be highly effective for direct DMC synthesis. The uniform doping of iron species in ceria lattice resulted in the formation of more surface oxygen vacancies, and thereby more coordinatively unsaturated surface metal cations and lattice oxygen anions were generated, which served as the Lewis acidic-basic sites required for the reaction. Based on in-situ DRIFTS results, it was deduced that the oxygen vacancies played a crucial role in activating CO2 to reactive bidentate carbonates and the formation of active terminal methoxy intermediates was also enhanced by Fe incorporation. Consequently, the maximum DMC yield of 3.84 mmol h-1 g-1 cat was obtained on Fe0.04Ce0.96Ox under relatively mild reaction conditions of 130 °C and 3.0 MPa. Additionally, in the tandem reaction system using 2-cyanopyridine (2-CP) as a dehydrating agent, the catalytic activity for 2-CP hydration was found to be closely associated with the total basicity of the catalysts, and in turn a higher hydration rate was more conducive to the DMC synthesis through enhancing in-situ water removal efficiency. As expected, the present work provides in-depth insights into the structure-performance relationship of Fe-modified ceria-based catalysts for direct DMC synthesis from CO2 and methanol, and offers meaningful guidance for the advancement of highly efficient catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Kunli Song,Shuqi Zhao,Zhenguo Li,Kaixiang Li,Yurong Xu,Yijun Zhang,Yonghong Cheng,Jian-Wen Shi
SSZ-13 has been commercialized as a catalyst in diesel engines for the selectivity catalytic reduction of nitrogen oxides (NO x ) with ammonia (NH 3 -SCR), but the catalyst is facing the problem of poisoning. Herein, two well-designed catalysts, Cu-SSZ-13 and cerium (Ce) doped Cu-SSZ-13 are synthesized, and their tolerance to zinc (Zn) and phosphorus (P) poisoning alone and together are explored in detail. The research found that Zn and P poisoning alone leads to the destruction of Cu-SSZ-13 structure, resulting in the decline of denitration (de-NO x ) performance following the mechanism dominated by Eley-Rideal (E-R). Surprisingly, it is found that zinc phosphate particles are formed at inactive sites on the surface of Cu-SSZ-13 in the presence of Zn and P together, which protects the active sites, enhances the adsorption of nitric oxide. As a result, the excellent de-NO x performance of Cu-SSZ-13 is well maintained following the dual mechanism of E-R and Langmuir-Hinshelwood (L-H). In addition, the introduction of Ce stabilizes the active sites, so as to improve the de-NO x performance and the poisoning tolerance of Cu-SSZ-13. This work deeply analyzes the reasons of Zn and P poisoning and the positive effect of Ce on Cu-SSZ-13, which provides ideas for improving the poisoning tolerance of Cu-SSZ-13 and promotes the further application.
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高影响因子
Molecular Catalysis
·
2017
·
IF 0
Peng Sun,Rui-tang Guo,Shu-ming Liu,Shu-xian Wang,Wei-guo Pan,Ming-yuan Li,Shuai-wei Liu,Jian Liu,Xiao Sun
CeSmOx mixed oxide catalysts supported on TiO 2 prepared by coprecipitation method were used for selective catalytic reduction of NOx with NH 3 . The results showed that the addition of Sm could effectively enhance the low-temperature SCR activity and SO 2 /H 2 O resistance of Ce/TiO 2 catalyst, and the appropriate mole ratio of Sm to Ce was 0.3. Characterization results indicated that the introduction of Sm could promote the formation of Ce 3+ and chemisorbed oxygen species on catalyst surface, which was favorable to the generation of NO 2 . Moreover, the doping of Sm could also promote the adsorption of NH 3 and NOx species on Ce/TiO 2 catalyst. The results of in situ DRIFT study revealed that the NH 3 -SCR reaction over CeSm/TiO 2 -0.3 catalyst was mainly controlled by the Langmuir−Hinshelwood mechanism in the low temperature range (<200 °C). Thereafter, the promoted NO oxidation and the enhanced NH 3 adsorption should play a major role for the excellent low-temperature SCR performance of CeSm/TiO 2 -0.3 catalyst.
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