FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8.8
Yuting Dong,Guohui Zeng,Yafang Shi,Zhibin Yang,Xingyong Liu,Hongjie Yang,Jing Ye,Meitian Xiao
The unclear gelation mechanism of K + in low-acyl gellan gum (LA)-guar gum (GG) hydrogel has hindered their further applications. In the present study, the critical role of K + concentration in regulating the structure-property relationships of LA-GG composite hydrogels was elucidated. Multiscale characterizations (texture analysis, rheology, zeta potential, density functional theory, etc.) demonstrated that the gelation process of LA-GG was primarily regulated by K + through electrostatic shielding of the carboxyl groups in LA. An optimal K + concentration of 0.6% ( w / v ) maximized the textural properties of the LA-GG gel, yielding a gel strength of 140.83 ± 5.34 g, chewiness of 213.77 ± 11.45 g, and cohesiveness of 0.90 ± 0.04 g, while concurrently enhancing its viscoelasticity. This improvement was attributed to K + -mediated electrostatic screening, which reduced intermolecular repulsion, promoted closer polysaccharide association, and facilitated the formation of a dense and homogeneous hydrogen-bonded network between LA and GG. Con v ersely, K + concentrations exceeding 0.6% ( w / v ) led to charge screening saturation, inducing inhomogeneous aggregation that compromised network uniformity and impaired gel performance. When utilized as capsule matrices, the 0.6% K + -mediated LA-GG gel exhibited superior gastrointestinal stability, with a minimal quercetin leakage of only 10.01% prior to reaching the simulated colon. In vitro digestion confirms its potential for targeted colonic delivery. This work establishes clear structure-function relationships in ion-regulated polysaccharide gels, offering guidance for designing controlled-release carriers for functional food applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Daquan Liu,Yanxia Wang,Xue Jiang,Huijun Kang,Xiong Yang,Xiaoying Zhang,Tongmin Wang
Microstructural modifications and appropriate element doping are necessary to simultaneously enhance the electrical conductivities and reduce the lattice thermal conductivities of thermoelectric materials . Herein, we propose a strategy of multielement doping combined with a burial sintering process to promote thermoelectric properties. Three-element doped Sr 0.9 La 0.05 Dy 0.05 Ti 1− x Nb x O 3 ( x = 0, 0.05, 0.10, 0.15, and 0.20) powders were synthesized by high-energy ball milling, and corresponding bulk samples were prepared by carbon burial sintering. In the bulk samples, we obtained the desired microstructures composed of shell-vesicular architectures with dense dislocations and second phase particles. These materials had ultrahigh electrical conductivities (∼5300 S cm −1 at 300 K), low lattice thermal conductivities (∼1.6 W m −1 K −1 from 700 to 1100 K when x = 0.2) and low total thermal conductivities (minimum value of 2.95 W m −1 K −1 when x = 0.05 at 1100 K). The maximum zT values were 0.28 when x = 0.05 and 0.27 when x = 0.2 at 1100 K. This strategy provides a possible direction for improving the thermoelectric properties of SrTiO 3 based materials.
研究领域:
材料科学
·
热电材料
·
陶瓷
·
固体物理
·
能源材料
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2023
·
IF 5.7
Li-Hui Yang,Wen-Jian Yang,Wei Sun,Muhammad Rizwan Haider,Hafiz M. Adeel Sharif,Hui Lin
Background A new heterogeneous metal catalyst with greater catalytic activity and stability for peroxymonosulfate (PMS) activation is desirable to be explored. Recently, ABO 3 -type perovskites have attracted much attention in PMS activation, but there is still much space for improvement as its easy tailoring of composition and structure. Lately, a high-entropy perovskite showed an excellent redox and stability, being a promising material in the field of electrochemistry. Method & result Herein, a high-entropy perovskite La(Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 )O 3-δ , termed LCMFCN, was synthesized and first applied to activate PMS for organics degradation. In the presence of 0.05 g·L −1 LCMFCN and 1 mmol·L −1 PMS, 99.1 ± 0.6% of Rhodamine B (RhB, 10 mg·L −1 ) was degraded within 60 min, which outperformed most perovskites with a single cation at the B-site (e.g., LaNiO 3 ). The LCMFCN also exhibited excellent stability, with RhB degradation efficiency of ∼96% after five consecutive cycles. 1 O 2 was suggested to play a vital role in RhB degradation in the PMS/LCMFCN system and two pathways of 1 O 2 generation were proposed: (i) 1 O 2 could evolve from the lattice oxygen, and (ii) 1 O 2 converted from O 2 •− . Indicate The results of this study suggest that the high-entropy perovskite can efficiently activate PMS for organics degradation, expanding the design range of perovskites application in water treatment.
研究领域:
环境化学
·
材料科学
·
催化化学
·
水处理技术
·
功能材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2853-2862
·
IF 4
Zurong Liao,Chaojie Li,Jiyou Zhong,Yang Li,Weiren Zhao
A broadband near-infrared (NIR) light source based on a phosphor-converted light-emitting diode (pc-LED) has attracted increasing interest to be used in non-destructive examination, security-monitoring and medical diagnosis fields, which stimulates the exploration of NIR phosphors with high performance. Herein, a series of Cr3+-activated garnet Ln3ScInGa3O12:Cr3+ (Ln = La, Gd, Y, and Lu) phosphors were reported, allowing an emission peak ranging from 726 to 822 nm. Among them, Y3ScInGa3O12:Cr3+ with an optimized Cr3+-doping concentration of 6 mol% exhibits a high internal quantum efficiency (IQE = 83.1%) and excellent absorption efficiency (AE = 44.2%) under 450 nm blue light excitation, enabling an external quantum efficiency as high as 36.7%. Moreover, this material can maintain 93.0% of the initial intensity when heated up to 423 K, implying outstanding thermal stability. Finally, a prototype NIR pc-LED device was fabricated by coating the optimized phosphor on a 455 nm LED chip, which generates a broadband NIR emission with a peak located at 765 nm and a full width at half maximum of 127 nm. The NIR output power and NIR photoelectric conversion efficiency of this device were found to be 38.01 mW and 11.0%, respectively, under 100 mA driving current, demonstrating the feasibility of this material to be applied in NIR pc-LEDs.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 25
·期 1
·95-107
·
IF 3.756
Lei Wang,Xudong Liu,Jinsheng Li,Mu Zhang,Xiaoguo Bi,Zhixin Ma,Jialin Chen,Xudong Sun
High-performance dielectric materials are essential components of electronic devices. In this work, RE-doped SrTiO3 (RE = La, Nd, Yb) single crystals with excellent dielectric properties were prepared by the Verneuil method. For La-STO and Nd-STO, the RE ions are substituted for Sr2+ only, and the excellent dielectric properties are mainly caused by defect dipoles associated with oxygen vacancies including and defect dipole clusters. For Yb-STO, Yb3+ partially replaces Ti4+, forming an additional defect dipole , resulting in the best dielectric properties (ε′ = 3.6 × 104, tan δ = 0.0036 under 1 kHz). In addition, N2 atmosphere treatment promotes the production of oxygen vacancies and Ti3+ and the formation of more defect dipoles, thus further optimizing the dielectric properties of Yb-STO (ε′ = 4.9 × 104, tan δ = 0.004 under 1 kHz). This work suggests that the dielectric properties of RE-doped SrTiO3 materials are closely related to oxygen vacancies, and the simultaneous substitution of Sr2+ and Ti4+ should enable obtaining dielectric properties superior to those of the substitution of Sr2+ only. The present work provides a clearer understanding of the origin of SrTiO3 dielectric properties, which is of great significance to the development of SrTiO3-based dielectric materials.
研究领域:
材料科学
·
凝聚态物理
·
电子器件
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shanhai Zhao,Yidan Luo,Chunhe Li,Kuankuan Ren,Yanyan Zhu,Weidong Dou
The synthesis of renewable fuel by CO 2 reduction is a promising research direction. The CO 2 reduction reaction may be promoted using photothermal catalysis to achieve efficient CO 2 conversion under mild conditions. In this context, designing efficient catalysts is urgent. In this work, ABO 3 (A = La, Ce; B = Ni, Co, Fe) perovskite catalysts were prepared by coprecipitation and calcination . Experimental results show that the A-site ions and B-site ions in ABO 3 perovskite nanomaterials have a great influence on their structure and photothermal catalytic performance. Among them, the LaNiO 3 catalyst shows excellent photothermal catalytic performance in the conversion of CO 2 to CO and CH 4 , which can generate 0.16 mmol g −1 h −1 CO and 1.38 mmol g −1 h −1 CH 4 at low CO 2 and H 2 concentrations. For the LaNiO 3 sample, its enhancement of catalytic performance mainly benefits from the largest number of active sites, the fastest carrier transport rate, and a relatively suitable band edge position compared with other catalysts. This study proposes a new method for improving the activity and selectivity of photothermal CO 2 reduction and offers a new direction for the recycling of waste gas.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhihua Gao,Fengyan Fu,Zhaozhi Zhang,Lili Niu,Min Jin,Jian Zhang,Zekun Zhao
Support materials are indispensable to promote the durability of iron oxides for chemical looping applications. However, the dilution effect of supports on the active phase would lead to decreased bulk oxygen conduction, thus leading to compromised activity. Here, we propose several Gd 3+ , La 3+ and Nd 3+ doped CeO 2 as active supports for iron oxides and investigate the support effect to improve hydrogen generation via chemical looping water gas shift . The characterizations show that the dopants improve the oxygen vacancy concentration in the CeO 2 lattice and Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ exhibits the most oxygen vacancy concentration among all the oxygen carriers. Pulse reactions of oxygen carriers show that an abundance of oxygen vacancy concentration can promote the lattice oxygen transfer in bulk, thus contributing to improved redox reactions . The high oxygen conductivity mitigates the dilution effect on the active phase. Therefore, Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ shows the highest hydrogen yield (∼9.49 mmol −1 .g −1 ) and hydrogen generation rate (∼0.632 mmol.g −1 .min −1 ) with only a slight decrease at 650 °C over 100 cycles. Overall, this work highlights the influence of support properties on the redox reactivity of iron oxides for chemical looping applications.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Minghao Zhou,Yaqi Xue,Fei Ge,Jing Li,Haihong Xia,Junming Xu,Jun Zhao,Changzhou Chen,Jianchun Jiang
MOF-derived Ni-based bimetallic catalysts were found to be effective for the in-situ hydrogenation/hydrodeoxygenation of lignin-derived monophenols and dimers with isopropanol as the hydrogen-donor solvent (without external hydrogen). The synergistic effects of bimetallic catalysts were studied, and their catalytic properties afforded the best conversion rate of phenols and cyclohexanol/cycloalkane yields. The detailed physicochemical characterization was conducted by means of XRD, H 2 -TPR, NH 3 -TPD, and pyridine-IR analysis. The effects of reaction temperature (200–260 ℃) and reaction time (2–5 h) on the performance of lignin-derived monophenols and dimers were investigated. During the in-situ hydrogenation/hydrodeoxygenation of lignin-derived phenols, the steric effects and the effects of various functional groups, notably methoxy groups, were investigated. In-situ conversion of lignin-derived phenols with isopropanol was achieved over different Ni/M ratios of NiM@C (M = Co, Mo, and La) catalysts, from which NiLa 0.33 @C produced satisfactory yields of cyclohexanol/cycloalkanes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Sikpaam Issaka Alhassan,Haiying Wang,Yingjie He,Lvji Yan,Yuxin Jiang,Bichao Wu,Ting Wang,Haiying Gang,Lei Huang,Linfeng Jin,Yongsheng Chen
Bauxite is a widely available Al-O-rich mineral with great potential for abating fluoride. However, low adsorption capacity, a narrow workable pH range, and a lack of clarity on the best removal mechanism hinder its application. In this work, a highly efficient bauxite nanocomposite (Bx-Ce-La@500) was synthesized via doping and pyrolysis , and its fluoride adsorption in industrial wastewater was examined. Doping Ce/La synergistically improved the fluoride adsorption affinity of the composite (from pH PZC 8.0 ~ 10.0) and enhanced the •OH. The materials were characterized by SEM-EDS, BET, XRD, and TGA while XPS, FTIR, and DFT were used to investigate the mechanism of fluoride sorption . Results show that Bx-Ce-La@ 500 has a positive zeta potential of 26.3–23.1 mV from pH 1~ 10. The Langmuir model was the best fit with a maximum adsorption capacity of 88.13 mg/g and removal efficiency up to 100% in 50 ppm F − solution. The high F − removal was attributed to the enhanced surface affinity and the formation of adequate •OH on the material. Except for carbonate and phosphate ions, other ions exhibited negligible effects and the selective removal of F − in real wastewater was high. The main mechanism of adsorption was the ligand/ion exchange and electrostatic attraction.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xueqin Wang,Tiesen Li,Chan Wang,Qingyan Cui,Tinghai Wang,Xiaojun Bao,Yuanyuan Yue
Designing a cost-effective and fast fabrication Cu-SSZ-13 with improved selective catalytic reduction of NO by ammonia (NH 3 -SCR) performance remains an open question. Here we report that LaCe-SSZ-13 zeolites were synthesized from spent fluid catalytic cracking catalyst within 12 h. After ion-exchanging with CuSO 4 solution, the obtained LaCeCu-SSZ-13 catalysts exhibit significantly higher catalytic activity and hydrothermal stability than conventional Cu-SSZ-13. Various characterizations reveal that La and Ce modification not only facilitates the disperse of isolated Cu 2+ species, but also effectively mitigates dealumination and inhibits copper species aggregation after hydrothermal aging. In-situ diffuse reflection infrared Fourier transform spectrum analyses demonstrate that La and Ce modification can accelerate the adsorption capacity for NH 3 and NO x and promote the decomposition of NH 4 NO 3 intermediate species on the catalyst, benefiting the improvement of low-temperature activity. The combination of experiments and theoretical calculations further demonstrate that the most stable positions of La and Ce are on different eight-membered rings in SSZ-13, and then Cu 2+ ions tend to enter eight-membered rings to enhance the NH 3 adsorption capacity and decrease the H 2 O adsorption capacity, which results in higher low-temperature activity and hydrothermal stability than Cu-SSZ-13. Our work provides a feasible strategy for preparing the efficient rare-earth-modified Cu-zeolite based NH 3 -SCR catalyst for nitrogen oxide abatement.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Liguang Dou,Mingkai Fu,Yuan Gao,Lei Wang,Cunji Yan,Tianzeng Ma,Qiangqiang Zhang,Xin Li
Direct hydrogenation of CO 2 to synthetic natural gas at a lower temperature remains a big challenge especially in the presence of H 2 S impurity. This contribution describes the synthesis, structure, morphology and doping effect of a series of robust catalysts for CO 2 methanation under resistive heating, based on Ni-layered double hydroxides (LDH) grown on porous and electrically conductive nickel foam (NF) derived structured catalysts. As a result, LaNi/NF showed the highest CO 2 conversion (55%) and CH 4 formation rate (631.5 mmol·g −1 ·h −1 ) at lower temperature of 250 °C and FeNi/NF gave the optimal conversion at 350 °C (75%, 860.9 mmol·g −1 ·h −1 ), which was superior to the most of recently reported Ni-based supported catalysts. We found that the CH 4 selectivity of the H 2 S (50 ppm) poisoned catalysts was significantly decreased and CO was verified as the main by-product. In this case, LaNi/NF and FeNi/NF still retained much higher conversion rate at 300 °C, 29.8% for LaNi/NF and 27% for FeNi/NF, than the almost deactivated unmodified Ni/NF with maximum 5% CO 2 conversion. The extraordinary activities can be explained as that the dopants can greatly strengthen the metal-support interaction and further enhance the reducibility of active metallic Ni, as XRD, HRTEM, TPR and XPS indicated. Besides of this, DFT calculations demonstrated that the existence of La can greatly promote CO 2 adsorption by lowering the adsorption barrier from 0.55 eV of pure Ni to 0.12 eV, and further inhibit the gaseous H 2 S from chemisorbing on the catalyst surface owning to the relatively unstable Ni-S bond.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Xudong Zheng,Wen Sun,Ning Wei,Tingting Bian,Yi Zhang,Lingli Li,Yuzhe Zhang,Zhongyu Li,Hongxiang Ou
Phosphorus and nitrogen flow to water leads to eutrophication and depletion of reserves. Bionic-inspired tannin modification is proposed for preparing a tannin-modified La–Zn(4,4′-dipy)(OAc) 2 /bacterial cellulose composite membrane for simultaneous adsorption of total phosphorus and ammonia nitrogen in water. Its physical and chemical properties were characterized by XRD , SEM , FT-IR, TGA and other characterization methods. La–Zn(4,4′-dipy)(OAc) 2 nanomaterial achieved effective adhesion on the tannin-modified bacterial cellulose membrane. Adsorption experiments showed that the composite membrane could both adsorb total phosphorus and ammonia nitrogen, and adsorption capacity of ammonia nitrogen was better than that of total phosphorus. The maximum adsorption capacities of ammonia nitrogen and total phosphorus were 482.35 mg/g and 374.71 mg/g. In the binary solution, the adsorption capacity of the composite membrane to ammonia nitrogen and total phosphorus decreased, but the adsorption capacity to phosphorus decreased slightly. Results of adsorption experiments showed that the adsorption process of nitrogen and phosphorus by the composite membrane belonged to single-layer adsorption, and the calculation results of the kinetic equation were in accordance with the quasi-second-order, and the adsorption equilibrium of the composite membrane was reached within 360 min. In short, the composite membrane had a better adsorption and separation effect both on ammonia nitrogen and total phosphorus.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）