JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Han Zhang,Sijia Sun,Hao Ding,Ying Chen
Using amorphous SiO 2 (A-SiO 2 ) and tetrabutyl titanate (TBOT) as raw material, a composite photocatalyst with surface loaded quantum dot size TiO 2 (A-SiO 2 /TiO 2 , AST) was prepared. The degradation of tetracycline hydrochloride as well as mechanism of performance improvement by A-SiO 2 were investigated. The TiO 2 on the composite was anatase with a content of 9.96 wt% and a size of 7–8 nm (quantum dot level). TiO 2 was uniformly distributed and was closely bonded at the interface by chemical bonds. The degradation rate of AST was 95% after 60 min UV exposure, which was comparable to pure nano-TiO 2 . The particle size of TiO 2 in AST was reduced from 20–50 nm to 7–8 nm comparing with pure nano-TiO 2 and changed from a highly agglomerated to a well-dispersed state due to abundant hydroxyl groups on A-SiO 2 surface. TiO 2 bandgap width increased from 3.25 eV to 3.39 eV. These led to the exposing of active sites on TiO 2 and significantly increased photogenerated carrier separation efficiency. This study provides a feasible and simple method to improve TiO 2 nanoparticles’ photocatalytic activity, reduce the usage and achieve recycling to cut the application cost by surface coated.
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
RENEWABLE ENERGY
·
2023
·
IF 8.7
Feiyi Chen,Yue Wang,Junhua Zhang,Huai Liu,Lincai Peng
Although metal oxide has unique advantages in catalytic transfer hydrogenation (CTH) of furfural (FAL) into furfuryl alcohol (FOL), the excessive stability of the metal site and oxygen coordination leads to the inert Lewis acid site in the oxide, which affects the catalytic activity and limits its broader application. It is known that the hydroxyl group on the oxide surface can promote the adsorption of isopropanol in an alkoxide species by assisting its deprotonation, thereby activating the metal site and enhance the overall reaction activity. However, constructing metal oxide with rich hydroxyl groups is always challenging. This contribution prepared a series of HfO 2 nanoparticles (NPs) with rich hydroxyl groups through hydrothermal methods . Systematic characterizations proved the presence of hydroxyl groups on the surface of HfO 2 NPs, which promoted its adsorption capacity for isopropanol (hydrogen donor and reaction solvent) and substrate (FAL), thus accelerating the subsequent reaction for CTH of FAL into FOL. As a result, a 100% of FAL conversion with 95.2% of FOL yield was obtained at 160 °C in 4 h, which has significant advantages over commercial and other literature reported oxides. This finding provides a new idea for designing of efficient metal oxides for the CTH reaction by enhancing the hydroxyl group.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Xiaotong Li,Xufei Shao,Zhisheng Wang,Jinzhu Ma,Hong He
Catalytic decomposition is a promising method of ozone (O 3 ) removal, and Ag-based catalysts have shown excellent O 3 decomposition performance. In this study, the chemical states of Ag species were successfully regulated by varying the loading of Ag and the particle size of α-Fe 2 O 3 supports, and the O 3 decomposition performance of different Ag species (monatomic Ag, Ag clusters (1–2 nm), small Ag nanoparticles (3–5 nm), large Ag nanoparticles (7–12 nm)) was determined. The changes undergone by Ag species after exposure to ozone were characterized in detail, and the ozone decomposition performance of the corresponding Ag species was determined. The terminal and doubly bridging hydroxyl groups on the Fe 2 O 3 support were determined to be the anchoring sites for Ag species. The Ag species and Fe 2 O 3 support are connected through oxygen bridges, forming Ag-O-Fe linkages. This study provides guidance for understanding the mechanism of the interaction between metals and supports and follow-up development of high-efficiency Ag-based catalysts.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2024
·
IF 3.3
Chenyang Gong,Lingling Cui,Dangsheng Xiong,Yan Ding
Osteoarthritis is a degenerative disease that is widely found in the elderly population, with a trend towards a younger age group in recent years. In the early stages of arthritis, patients are treated with hyaluronic acid injections and anti-inflammatory drugs. However, it has been found that hyaluronic acid can only play a supportive role and does not have a lubricating effect, and due to the absence of blood vessels, nerves, and lymphatic vessels in the articular cartilage, the oral anti-inflammatory drugs cannot reach the interface of the inflammatory joints adequately, and the drug utilisation rate is low. Herein, we designed and prepared a brush-like bionic lubricant for joint lubrication and drug loading. The poly(2-methyl-2-oxazoline) branched chain was grafted onto the hyaluronic acid main chain by ring-opening polymerisation and graft polymerisation to form a brush-like bionic lubricin containing multiple hydrophilic groups, which was self-assembled to encapsulate the drug by using its multi-branched special structure for drug loading. The friction behaviour tests on the articular cartilage surface showed that the prepared bionic lubricin has excellent lubrication effect, with a minimum friction coefficient of 0.036 close to the lubrication effect of natural synovial fluid, which is mainly due to the hydrophilic groups on its molecular chain that can adsorb the water molecules and form a hydration layer at the cartilage interface, which plays the role of hydration lubrication. In addition, in vitro drug release studies showed that the synthesised drug-loading biomimetic lubricin had a certain drug release capacity, and the maximum drug release rate could reach 77.8 % at 72 h. The synthesis of this bionic lubricant with dual functions of lubrication and drug release provides a new idea for the treatment of osteoarthritis.
研究领域:
生物材料学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Wenqing Xu,Yixi Wang,Hong He,Jun Yang,Yang Yang,Jinzhu Ma,Chaoqun Li,Tingyu Zhu
High–performance catalysts are extremely required for controlling NH 3 emission via selective catalytic oxidation (SCO), and the anchoring structural feature of active sites is a key prerequisite for developing them. This study confirms the importance of hydroxyl groups on vacancy–deficient reducible oxides as active groups. On the one hand, spontaneous atomic dispersion of active metal Ir is promoted by the abundant terminal hydroxyl groups. On the other hand, Ir cations anchor on the TiO 2 surface through exchange with H + in Ti–OH groups, and thus occupy the Brönsted acid sites. The adsorption strength of NH 3 is another key factor affecting the reaction rate–determining step, namely NH 3 dehydrogenation , which occurs at a faster rate in the coordinated L–NH 3 rather than the ionic B–NH 4 + . Meanwhile, the coordinated L–NH 3 significantly avoids the competitive adsorption of water vapor in the NH 3 –SCO reaction by reducing the number of hydrogen bonding. The TOF of preferred 0.8Ir/TiO 2 sample is significantly higher than 0.2Ir/TiO 2 sample, although Ir is almost always atomic dispersed. Finally, NH 3 conversion is 85% in a wet circumstance (5% H 2 O) at 240 °C (GHSV = 85 000 h –1 ), with a N 2 selectivity of up to 65% on 0.8Ir/TiO 2 sample.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 13
·50131
·
IF 2.52
Xuan-Yu He,Ting Wang,Zhong-Cheng Pan,Abdul Qadeer Dayo,Jun Wang,Wen-Bin Liu
In this article, 9, 9-bis (4-aminophenyl)-2, 7-dihydroxy-fluorene (BADHF) was synthesized using methylsulfonic acid as catalyzer by direct condensation. Two kinds of novel multifunctional benzoxazine monomers containing fluorenyl groups and hydroxyl groups (MB-FH) were obtained from the chemical reaction of BADHF, salicylaldehyde, paraformaldehyde, and ethanolamine (or diethyleneglycolamine) through the adoption of o-hydroxy-benzylamine method and one-step Mannich condensation reaction method. In the traditional three-step synthesis method, the double bond reduction process took 8–12 h, but in this article, it only took 15 min. The structures of MB-FH monomers and their intermediates were characterized by Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance ( 1 H NMR). The curing behaviors, curing kinetics, and thermal properties of MB-FH monomers were tested by using a dynamic rheometer, differential scanning calorimeter (DSC), FTIR, dynamic mechanical analysis (DMA), and thermogravimetric analyzer (TGA). The curing induction time can be apparently shortened by the introduction of hydroxyl groups into benzoxazine monomers, and it can catalyze the ring-opening polymerization of oxazine rings at lower temperatures, and improve the interaction of hydrogen bonds in the structure of polybenzoxazine.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYTOCHEMISTRY
·
2021
·
IF 4.072
Xudong Zhang,Xing Huang,Yan Li,Faqing Tao,Qinshi Zhao,Weiqi Li
Polar auxin transport (PAT) is essential to control root growth. Flavonoids are widely thought to be PAT inhibitors leading to short root developments. However, we found that the flavonoids scutellarin and scutellarein , which both have a 6-hydroxyl group unlike the structure of known flavonoid-PAT-inhibitors, promote PAT in roots. They increase root length; rescue the short roots induced by the PAT-specific inhibitor TIBA; enhance the expression of the PAT mediators PIN1 , PIN2 and AUX1 ; increase the auxin concentration at the quiescent center; and change the distribution of the meristem organizer WOX5. In contrast, rutin and naringenin , which have no 6-hydroxyl group and have different structural features in B-ring, shows the opposite/no effects. Our evidence suggests that flavonoids with and without a 6-hydroxyl group might result in opposite effects on root growth and thus act as chemical switches in regulating PAT.
研究领域:
植物学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Mai Ouyang,Qianwen Jiang,Kehui Hu,Yupei Deng,Huiwen Zhang,Mengke Kong,Yiyue Shen,Fahui Li,Guowei Wang,Linghua Zhuang
Ionic liquid surfactant (ILS) shows potential application in surfactant enhancing oil recovery (SEOR). The structure–activity relationship between structural characteristics and foam feature is significant for the design and selection of favorable ILS for foam enhanced oil recovery (FEOR). In this paper, the effect of structural substituent groups of anionic ILSs on foam features was established through experimental methods and Density functional theory (DFT) simulations. Physicochemical features of hydroxyl-based anionic ILS, 1-(2,3-dihydroxypropyl)-3-butylimidazolium dodecyl sulfate ([DPbim][DS]) was detected. By surface tensiometry, the critical micelle concentration (CMC) value of [DPbim][DS] was 0.427 mmol/L. Foam properties of three ILSs ([DPbim][DS], [Hmim][DS] (1-hexyl-3-methylimidazolium dodecyl sulfate), and [Bmim][DS] (1-butyl-3- methylimidazolium dodecyl sulfate), and sodium dodecyl sulfate (SDS) were established. The foam features of ILSs and SDS followed: [DPbim][DS] > [Hmim][DS] > [Bmim][DS] > SDS. ILS hydrates showed tendency: [Bmim][DS](H 2 O) n > [Hmim][DS](H 2 O) n > [DPbim][DS](H 2 O) n . D 0 values followed the tendency: [DPbim][DS](H 2 O) n > [Hmim][DS](H 2 O) n > [Bmim][DS](H 2 O) n . Experimental and DFT results verified the introduction of hydroxyl group and longer alkyl chain length in imidazolium cation was favorable for foam features of ILSs. This information will help to screen new foam surfactants for FEOR.
研究领域:
化学工程
·
石油工程
·
理论化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Xufang Li,Weiyu Chen,Luming Ma,Yuanxing Huang,Hongwu Wang
Iron shavings were modified and used as the catalyst (named as Fe-shaving-based catalyst) for the ozonation of bio-treated coking wastewater. The difference of organic pollutants oxidation between catalytic and sole ozonation processes was characterized by MW (Molecular Weight) distribution and 3DEEM (Three-dimensional Excitation and Emission Matrix Fluorescence) analysis. Removals of the pollutants with MW of 5–10 kDa and 10–20 kDa in catalytic ozonation process were 81.5% and 85.2%, which were far better than that in sole ozonation process (31.1% and 41.8%). Organics with MW of 0.3–2 kDa and 2–5 kDa would accumulate in both two processes, while the accumulation amount in catalytic ozonation process was half of it in sole ozonation process. The removal of fluorescent substances in catalytic ozonation process experienced a procedure of lower firstly (<15 min) and then higher (>15 min) than that in sole ozonation process. The slight residual fluorescent substances were completely removed in catalytic ozonation process, while remained unchanged in sole ozonation process with the reaction time increasing to 180 min. The catalytic effect of Fe-shaving-based catalyst was better than commonly used powder catalysts and the TOC (Total Organic Carbon) removal attained to 78%. Hydroxyl radicals (·OH) were confirmed to be the effective oxidant in catalytic ozonation process through inhibition experiments. The cumulative ·OH formations with 200 g/L Fe-shaving-based catalyst during 180 min were 362 μmol, which explained the better catalytic effect of it. The surface hydroxyl groups were determined to be the most probable active sites for ·OH generation through phosphate inhibition experiments. Besides the excellent catalytic effect, using Fe-shaving-based catalyst provided a feasible resource utilization method of industrial waste Fe-shavings. Thereby, it is a promising catalyst for practical industrial wastewater advanced treatment with catalytic ozonation process.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jingzhi Hou,Hongyan Zhang,Chu Chen,Chen Yang,Haiyang Zhang,Zhipeng Li
In this study, a high-performance ammonia (NH 3 ) gas sensor based on a CeO 2 /CdS heterojunction with increased surface defects was prepared using the hydrothermal method. First-principles calculations based on density functional theory (DFT) were employed to elucidate the sensing mechanism. Experimental results indicate that more surface defects and surface hydroxyl groups can effectively enhance the performance of the CeO 2 /CdS NH 3 gas sensor at room temperature. The response value of CeO 2 /CdS is 739.5 at a concentration of 500 ppm NH 3 , and the response/recovery time at 50 ppm is 1.27 s/1.63 s, which is faster compared with the previously reported NH 3 gas sensors based on CeO 2 . Theoretical calculations suggest that the presence of more oxygen vacancies or sulfur vacancies on the surface of CeO 2 or CdS can lead to the generation of additional d electrons and the capture of more NH 3 molecules. Furthermore, it was discovered for the first time that the d-band center of CeO 2 could shift upward under more surface oxygen vacancies and hydroxyl groups, which can improve the chemical activity of the CeO 2 /CdS and enhance its adsorption capacity for NH 3 molecules. This research constructed CeO 2 /CdS with multiple surface defects through a heterogeneous structure, providing new ideas for developing high-performance NH 3 gas sensors.
研究领域:
材料科学
·
传感器技术
·
表面化学
·
纳米材料
·
气体传感
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2025
·Vol. 15
·期 7
·739
·
IF 2.2
Ying Li,Xingzhong Yuan,Xiuying Wei,Yao Long
Halloysite nanotubes, a naturally occurring nanomaterial with a unique tubular morphology, have shown considerable potential for heavy metal remediation. However, significant inconsistencies in the reported maximum adsorption capacities (qmax) for heavy metal ions—such as Pb2+, which ranges from 7.5 to 84.0 mg/g with a coefficient of variation (CV) of 68%—have severely hindered both scientific understanding and practical application of this promising material. To address this critical knowledge gap, we conducted a reassessment using carefully selected halloysite specimens from three geologically distinct deposits (Utah, USA; Henan and Yunnan, China). Under rigorously controlled experimental conditions, we precisely quantified the adsorption capacities of halloysite for Cd2+, Zn2+, and Pb2+. Through an integrated multi-technique characterization approach involving XRF, XRD, FTIR, TEM, and BET analyses, we identified two fundamental crystallochemical parameters that govern the adsorption performance of halloysite: the degree of lattice substitution and the density of surface hydroxyl groups. Our findings reveal that optimal heavy metal adsorption occurs in halloysite with lower lattice substitution and higher surface hydroxyl density. This work not only provides a reliable range of adsorption capacities for halloysite but, more importantly, establishes a scientific foundation for optimizing the application of halloysite in heavy metal remediation.
研究领域:
环境科学
·
纳米材料
·
吸附
·
粘土矿物学
·
修复技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2020
·
IF 0
Ao Li,Qingqing Rao,Fugen Liang,Lina Song,Xiaoli Zhan,Fengqiu Chen,Jian Chen,Qinghua Zhang
Nanofiltration (NF) membranes have attracted significant attention owing to their widespread applications in water treatment and seawater desalination. However, challenges still remain in improving their antifouling performance and water permeation. Here, a sulfobetaine-based zwitterion with polyhydroxy groups was designed and synthesized successfully. Then, the NF membranes were modified by the reaction of the hydroxyl group of the zwitterion and the acid chloride group on the surface of the initial NF membrane. Hence, the hydrophilicity of the NF membrane was significantly enhanced and resulted in the high promotion of nanofiltration performance and antifouling property. Besides, the flux of the modified NF membrane (A2) reached 9.28 L m–2 h–1 bar–1, which was 2.2 times higher than the flux of pristine NF membrane (A0). Nevertheless, the rejection showed a slight decrease. Also, the modified NF membrane possessed excellent fouling resistance to protein; the flux recovery ratio was nearly 98% after the membrane was treated with bovine serum albumin for 2.5 cycles. The excellent water flux and fouling resistance of this NF membrane advanced its application in wastewater treatment.
研究领域:
环境工程
·
膜科学
·
水处理
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）