Surfaces and Interfaces
·
2023
·
IF 6.2
Xiangyue Wei,Yixin Pan,Jisheng Kou,Rui Huang
The removal of selenium (IV) from aqueous solutions was the focus of research that led to the discovery of a novel type of composite adsorbent called FeS@h-BN nanocomposite . This adsorbent was studied, characterized, and put to use in a fixed bed column. SEM, FTIR, XRD, and XPS analyses were conducted to learn more about the coated layer's surface properties. The effect of several adsorbent materials on the remediation of Se(IV) in dynamic water was examined. The Adams-Bohart model, the Thomas model, and the Yoon-Nelson model were all utilized to get optimal fits to the kinetic data obtained from the adsorption process. Moreover, the Adams-Bohart model was only applicable to the beginning portion of the dynamic behavior of the FeS and FeS@h-BN columns. The Thomas and Yoon-Nelson models were sufficient for describing the breakthrough curve under all experimental conditions. For this dynamic process, the theoretical breakthrough curve profile was compared to an experimentally derived profile. It was discovered that FeS@h-BN nanocomposites are the most effective at removing Se(IV), and the adsorption of Se(IV) by a variety of adsorbent materials is enough for all three dynamic models.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2019
·
IF 4.745
Na Li,Jinku Bai,Xiaolin Zheng,Honghua Rao
An iron-catalyzed methylene forming strategy is disclosed through sequential C–H and C–O bond functionalization of methanol with cosolvent water. This protocol provides an easy and novel access to methylene-tethered imidazo[1,2-a]pyridine and 2-aminopyridine analogues in a sustainable manner and represents a complementary approach to traditional methylene forming strategies.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 18
·8045-8053
·
IF 3.591
Yaping Zhang,Daofei Lv,Jiayu Chen,Zewei Liu,Chongxiong Duan,Xin Chen,Wenbing Yuan,Hongxia Xi,Qibin Xia
The separation of ethylene/ethane mixtures using energy-efficient technologies is important but challenging. In this study, we prepared a Zr-based metal–organic framework (MOF-545) possessing a high Brunauer–Emmett–Teller (BET) surface area of 2265.4 m2 g−1, and investigated its adsorption performance for ethylene/ethane separation. Isotherm measurements show that MOF-545 exhibits preferential adsorption of ethane over ethylene. The mechanism underlying the selective adsorption of ethane over ethylene was revealed by the calculations of preferential adsorption sites, interaction energies and adsorption density distributions of ethane and ethylene in MOF-545 via the Metropolis Monte Carlo method. Results show that the strong C–H⋯N hydrogen bonding between ethane molecules and porphyrin rings gives rise to the selective adsorption of ethane over ethylene. Thermal, air and cycling stability tests, adsorption selectivity and adsorption enthalpy calculations, and breakthrough experiments comprehensively validate the potential of MOF-545 as an efficient ethane-selective adsorbent for ethane/ethylene separation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MRS Communications
·
2023
·Vol. 13
·期 2
·268-275
·
IF 1.9
Qiao Xinfeng,Hu Chuanlin,Yao Shun,Wang Fazhou
This study is to explore the micro-mechanical properties of C–S–H modified by various carbon nanotubes and the correlation with the nano/micro-structures. The results show that carboxyl-functionalized single-walled carbon nanotubes provide the great template for the growth of C–S–H and reduce the porosity and surface defects of C–S–H particles. The highly ordered and dense layered structure of C–S–H greatly improves its micro-mechanical properties. In addition, the functional groups (–COOH) of functionalized carbon nanotubes can combine with the Ca–O bond of C–S–H to change the interlayer spacing of C–S–H, and the effects are particularly significant at low Ca/Si. Graphical abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Yingying Niu,Xin Zhou,Wei Gao,Maixia Fu,Yule Duan,Jiandong Yao,Bing Wang,Mengmeng Yang,Zhaoqiang Zheng,Jingbo Li
Driven by the rapid development of autonomous vehicles, ultrasensitive photodetectors with high signal-to-noise ratio and ultraweak light detection capability are urgently needed. Due to its intriguing attributes, the emerging van der Waals material, indium selenide (In2Se3), has attracted extensive attention as an ultrasensitive photoactive material. However, the lack of an effective photoconductive gain mechanism in individual In2Se3 inhibits its further application. Herein, we propose a heterostructure photodetector consisting of an In2Se3 photoactive channel, a hexagonal boron nitride (h-BN) passivation layer, and a CsPb(Br/I)3 quantum dot gain layer. This device manifests a signal-to-noise ratio of 2 × 106 with responsivity of 2994 A/W and detectivity of 4.3 × 1014 Jones. Especially, it enables the detection of weak light as low as 0.03 μW/cm2. These performance characteristics are ascribed to the interfacial engineering. In2Se3 and CsPb(Br/I)3 with type-II band alignment promote the separation of photocarriers, while h-BN passivates the impurities on CsPb(Br/I)3 and promises a high-quality carrier transport interface. Furthermore, this device is successfully integrated into an automatic obstacle avoidance system, demonstrating promising application prospects in autonomous vehicles.
研究领域:
材料科学
·
电子工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMATERIALS
·
2021
·
IF 12.479
Yang Tian,Wen-Li Jiang,Wen-Xin Wang,Guo-Jiang Mao,Yongfei Li,Chun-Yan Li
The reduced coenzymes (NADH and NADPH) are an important product in energy metabolism and closely related to the occurrence and development of cancer. So it is necessary to use a powerful detection tool to visualize NAD(P)H in energy metabolism of tumor cells and find a new strategy to improve cancer treatment based on NAD(P)H. Herein, a novel multifunctional probe (Cy-N) is synthesized with good near-infrared fluorescence (NIRF) response to NAD(P)H and the photoacoustic (PA) and photothermal properties are successfully activated by NAD(P)H. The probe is successfully applied in visualizing NAD(P)H in energy metabolism of tumor cells and imaging NAD(P)H in bacteria. Moreover, the probe can be used to image NAD(P)H in energy metabolism of tumor-bearing mice by dual-modal imaging (NIRF and PA). More importantly, in terms of the role of NAD(P)H in energy metabolism, the photothermal therapy (PTT) is activated by NAD(P)H and a novel strategy of enhanced PTT is proposed by injecting glucose. As far as we know, this is the first probe to detect NAD(P)H in energy metabolism through dual-modal imaging, and also the first probe to activate PTT based on NAD(P)H, which will provide important information of the diagnosis and treatment of cancer.
研究领域:
生物化学
·
医学影像学
·
癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaoxiao Wang,Yanmei Yang,Zhiqing Zhou,Yuling Zhong,Miaomiao Qin,Weiqing Wang,Weifeng Li,Bo Tang
5-hydroxymethylfurfural (HMF) is one of the most promising biomass-based chemicals that is used to produce many kinds of important compounds. Especially, the selective conversion of HMF to 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), an important chemical feedstock, has high industrial significance but is technically challenging. In this study, we present a high-performance photocatalyst for selective oxidation of HMF to HMFCA. By integrating an ultrasmall amount of palladium (Pd) nanoclusters (1.12‰ in weight) on defective hexagonal boron nitride nanosheets (Pd/defective h-BN nanosheets (dh-BNs)), outstanding photocatalytic performance can be achieved, resulting in up to a 95% HMF conversion ratio with an 82% HMFCA selectivity. The performance is considerably higher than that of pristine dh-BNs and Pd on defect-free h-BNs. More importantly, this Pd/dh-BNs catalyst maintains a high catalytic activity after eight cycles, demonstrating robust catalytic stability. Density functional theory calculations indicate that Pd/dh-BNs can lower the energy barrier for HMF oxidation and facilitate the desorption of HMFCA, which contributes to the high selectivity catalytic performance. This study not only introduces a promising photocatalyst for sustainable chemical transformations but can also provide valuable insights into the design of advanced photocatalytic material for biorefinery applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 28
·e202402061
·
IF 1.9
Jiankang Ou,Haoyu Liu,Zeguo Fang,Qian Zhang,Dong Li
Graphical Construction of C−C bonds of alkyl-substituted naphthoquinones through C−H/C−H cross dehydrogenation coupling of naphthoquinones with acetone and 1,3-dicarbonyl compounds was developed. A direct C−H alkylation of naphthoquinones with acetone and 1,3-dicarbonyl compounds was developed to construct C−C bonds of alkyl-substituted naphthoquinone derivatives. It proceeded through an oxidative radical cross dehydrogenation coupling process under simple and mild conditions. This method provides a facile and efficient route for synthesis of functionalized naphthoquinones from readily available feedstocks.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Ming Li,Jun-Yang Tao,Liang-Neng Wang,Jia-Wei Li,Yue-Jin Liu,Ming-Hua Zeng
Modification of commercially available biaryl monophosphine ligands via ruthenium(II)-catalyzed P(III)-directed-catalyzed ortho C–H secondary alkylation is described. The use of highly ring-strained norbornene as a secondary alkylating reagent is the key to this transformation. A series of highly bulky ligands with a norbornyl group were obtained in excellent yields. The modified ligands with secondary alkyl group outperformed common substituted phosphines in the Suzuki–Miyaura cross-coupling reaction at a ppm mole level of Pd catalyst.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Shengxin An,Shuaibo Zhao,Jingting Jin,Tao He,Yuhao Wang,Na Kong,Jie Zhou,Wenzhi Li
Great expectations have been placed on bimetallic co-modified zeolite for the direct oxidation of methane to methanol. In this work, H-ZSM-5 zeolite was modified with bimetallic copper and zinc via ion-exchange method. Numerous experiments were conducted and the methanol yield of 44,302.70 μmol·g cat −1 ·h −1 was obtained over 1Cu/2Zn-ZSM-5 catalyst. A series of characterization analyses confirmed that the introduction of Zn increased the proportion of active Cu species bound to extra-framework oxygen by altering the electronic state of copper. The bis (μ-oxo) dicopper ligand was identified as the active site for methane oxidation. The possible reasonable reaction pathway was the free radical reaction. This work provides a valuable guidance for the preparation of co-modified zeolite catalysts for the direct oxidation of methane to methanol.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16455-16469
·
IF 3.553
Zhang Zengqi,Wang Qiang,Zhang Mingzhong,Huang Zongxian,Zhuang Shiyu
The filler effect is the most important physical mechanism of mineral admixtures in the early hydration of cement whose chemical properties greatly affect the precipitation of C–S–H. In this study, calcite, strontianite, magnesite, dolomite, quartz, whewellite and whitlockite were selected as the fillers. The morphology and reaction kinetics of synthetic C–S–H precipitated on the surfaces of different fillers were studied via electron microscopy observations and electrical conductivity and ion concentration measurements. The precipitation rate of C–S–H has a positive correlation with the affinity of Ca 2+ for adsorption on the fillers, which can be explained by the nucleation barrier of C–S–H. Extremely ordered honeycomb-like morphology of the C–S–H is found on calcite and strontianite surfaces, while less regular leaf-like or honeycomb-like C–S–H is found on whewellite and whitlockite. The ordered C–S–H pattern is related to the lattice cleavage of the ionic compound filler. In the case of quartz, C–S–H prefers growth along the tangential direction, which is quite different from the normal-direction growth on ionic compounds. The in-plane growth of C–S–H on quartz is believed to be induced by a layer of loosely physically adsorbed Ca 2+ .
研究领域:
材料科学
·
水泥化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Qicheng Li,Xihu Zhao,Xiaobo Song,Juan Dong,Zhitong Zhao,Pan Hao,Qi Shi,Xuekuan Li
Benzene alkylation with syngas is attractive for alkylbenzene production, which use metals/metal oxides combining H-ZSM-5 zeolites as the catalyst. Herein, the H-ZSM-5 zeolites with three different morphologies—spindle-, flake-, and nano-sized—were synthesized. Subsequently, crystal structural, textural and acidic properties of three H-ZSM-5 zeolites and their corresponding bifunctional catalysts were characterized and the catalytic reaction activity and stability of the benzene alkylation with syngas were investigated. The bifunctional catalyst derived from nano-sized zeolites demonstrates an initial benzene conversion rate of 46.7% and reduces by 71.78% after 51 h of continuous operation, owing to abundant acid sites, large surface area and mesopores diameters, and balanced acidity to promote reactant and product diffusion. The spindle-shaped zeolite catalyst delivers the highest initial benzene conversion rate (53.77%) due to abundant acid sites. However, the benzene conversion rate drops to 12.12% of the initial value after 39 h due to limited micropore volume and relatively small mesopore diameters of the catalyst. The flake-shaped zeolite catalyst exhibits the lowest initial conversion rate and the shortest lifetime (30 h) owing to the fewest accessible acid sites and the peculiar pore structure. Three cases indicate that increasing mesopore volume is conducive to improve ratio of Brønsted to Lewis acid sites (B/L), resulting in enhancement of the catalytic activity. Meanwhile, the huge micropore volume and increased mesopore diameter are positive to alleviate pore blockage and coverage of active sites due to high mass-transfer efficiency within the zeolitic channels. These textural advantages collectively contribute to a delayed catalyst deactivation process and sustained catalytic activity. This work highlights the pivotal role of the H-ZSM-5 morphology in the benzene alkylation process with syngas and facilitates the efficient development of production process for non-oil alkylbenzene.
研究领域:
催化化学
·
材料化学
·
石油化工
·
多相催化
·
纳米材料
✓ 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）