ACS Agricultural Science & Technology
·
2023
·
IF 2.5
Huiping Chen,Yongpan Shan,Chunli Xu,Muhammad Bilal,Pengyue Zhao,Chong Cao,Hongjun Zhang,Qiliang Huang,Lidong Cao
A controlled pesticide delivery system has attracted considerable attention in recent years. Metal–organic frameworks (MOFs), which are one of the most rapidly developing porous materials, have been used as pesticide carriers. However, the inherent toxicity of reported metal nodes or the expensiveness of organic ligands is not desirable, which limits the practical application of such pesticide-loaded MOF delivery systems. γ-Cyclodextrin-based MOFs (γ-CD–MOFs) are considered as a green renewable framework material; however, it has been less exploited as a multifunctional pesticide carrier in agricultural applications. In this study, avermectins (AVM) were loaded into γ-CD–MOFs (AVM−γ-CD–MOFs) with a loading content of 20.41% by physical absorption. AVM−γ-CD–MOFs exhibited pH-responsive release profiles and had better stability under photoirradiation. Moreover, it could promote the growth of cotton roots and stems, improve the chlorophyll content, and decrease malondialdehyde content to a certain extent by facilitating the activities of peroxidase. Compared with AVM technical concentrate wettable powder, the AVM−γ-CD–MOF wettable powder exhibited a better acaricidal activity against Panonychus citri (McGregor). In short, this research explores the feasibility of γ-CD–MOFs as a platform for potential application in sustainable plant protection.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Weizhen Zhang,Wenqian He,Qian Yan,Lele Zhang,Nan Ni,Shaorui Song,Shuhua Tu,Jie Feng
Surfactant-free interfacial synthesis of hollow Al 2 O 3 via kinetic modulation • Chelation enables precursor transition from hydrophobic to amphiphilic states. • Simple room-temperature strategy bypasses harsh energy-intensive methods. • PDRC coatings deliver 97.6% solar reflectance and 0.976 mid-IR emissivity. • The scalable coatings realize a remarkable sub-ambient cooling of 9.66 °C. Hollow γ-Al 2 O 3 architectures are highly attractive for passive daytime radiative cooling (PDRC) owing to their low density and unique optical characteristics. However, their fabrication typically relies on sacrificial templates, hydrothermal treatments, or high-temperature processing, while the intrinsically ultrafast hydrolysis of aluminum alkoxides has long prevented their use in hollow-structure engineering. Here, we report a surfactant-free, chelation-enabled interfacial synthesis strategy that overcomes this limitation through kinetic regulation of aluminum sec-butoxide. The coordination process gradually transforms the precursor from hydrophobic to amphiphilic, enabling spontaneous self-emulsification and controlled interfacial assembly. As a result, hierarchical hollow γ-AlO(OH) microspheres are obtained at room temperature and subsequently converted into hollow γ-Al 2 O 3 microspheres by calcination. The resulting hollow γ-Al 2 O 3 microspheres exhibit tunable diameters (3.3–15.8 μm), uniform nanoscale shells (162 ± 60 nm), and an ultralow density of 0.083 g·cm −3 . The process is readily scalable using an industrial homogenizer. When incorporated into coatings, the hollow microspheres provide abundant dielectric interfaces that enhance solar reflection and thermal emission, delivering a solar reflectance of 97.6%, an atmospheric window emissivity of 0.976, and a sub-ambient cooling of 9.66 °C under a solar irradiance of 454.5 W·m −2 . This work provides a scalable and energy-efficient manufacturing strategy for hollow γ-Al 2 O 3 architectures, offering significant potential for large-area radiative cooling coatings and thermal management applications. Download: Download high-res image (108KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Peikun Wu,Xiangkai Kong,Yingrui Feng,Wei Ding,Zhigao Sheng,Qiangchun Liu,Guangbin Ji
To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward microwave radiation. Herein, amorphous/crystalline γ-Fe 2 O 3 nanosheets (Fe-H) are carefully fabricated through a controlled annealing process. The matched Fermi levels formed on both sides of the heterophase interface not only provides efficient interfacial polarizations but also facilitates the transport of electrons with less scattering over the whole Fe-H nanosheets. Thereby, both of the conduction loss and dielectric polarization relaxation are promoted, leading to a strengthened attenuation toward electromagnetic wave radiation. The as-synthesized Fe-H sample exhibited a minimum reflection loss of -89.5 dB centered at a thickness of 2.00 mm, associated with an effective absorption bandwidth (reflection loss ≤ -10 dB) reaching 6.45 GHz. All of these behaviors are superior to its pure amorphous absorbent and bare crystalline counterpart. Furthermore, this heterophase engineering strategy is valid when extended to Co and Ni based oxides, suggesting its universality and generality for promoting microwave absorption. Henceforth, this study indicates a favorable potential of the synthesis and application of amorphous/crystalline materials as heterophase microwave absorbents.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Wenbin Huang,Qiang Wei,Haoran Liu,Han Yang,Zhen Xu,Zhengyu Chen,Dongdong Chen,Yasong Zhou
The reason for high-difficulty nitrogen removal of aromatic N-heterocyclic compounds in petroleum fractions was investigated from the main thought of “NiWS property - Reaction behavior - DFT calculation”. The properties of the used catalyst were characterized by a series of techniques with the aim of providing the basis for model construction in the DFT calculations. The kinetic experiments in fixed-bed reactor revealed that although 1,2,3,4-tetrahydroquinoline (THQ1) and decahydroquinoline (DHQ), o-ethylaniline (OEA) exhibited relatively high yields in the HDN reaction of quinoline and indole respectively, they were all able to show high conversions and HDN rates when reacted as feedstocks alone. The study of product normalizations in the reaction system of the mixed feedstocks demonstrated that the difficulty of conversion of THQ1 and DHQ in quinoline HDN was mainly due to the inhibition effect of quinoline feedstock. While in the HDN of indole, the presence of the intermediate product OEA was the main factor for the low conversion of indole. This phenomenon of inhibition originating from within the molecular reaction network was proposed as N-N self-inhibition effect for the first time. The DFT calculations suggested that the inhibition of quinoline on THQ1 could be attributed to the adsorption advantage of quinoline, while the inhibition on DHQ was mainly due to the steric hindrance effect of DHQ itself. And the inhibition effect of OEA on indole can be mainly attributed to its greater nucleophilicity and stronger adsorption ability on the active sites compared with IND.
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 21
·6185-6197
·
IF 5
Hui Guo,Tingting Ge,Yuchao Li,Yuxia Li,Yanxia Zheng,Xinpeng Guo,Haofei Huang,Ming Wang,Cuncun Zuo
Organic solvent method was used to prepare the active component VPO, which was loaded on ball-milled γ-Al2O3 support. VPO/γ-Al2O3 catalysts were synthesized by in situ generation for the synthesis of acrylic acid (AA) by the aldol condensation of acetic acid (HAc) and formaldehyde (HCHO). The effects of the calcination temperature and the loading of the active component VPO on catalytic activity were systematically investigated. XRD, BET, SEM, CO2/NH3-TPD, FT-IR spectroscopy, and TG techniques were used to characterize the VPO/γ-Al2O3 catalysts. The results showed that the catalyst had the best crystal structure and acid–base activity center at a calcination temperature of 350 °C. The catalytic performance was evaluated using a fixed bed reactor. 60% VPO/γ-Al2O3 exhibited the highest reactivity, and the yield of AA was up to 51.5%. Response surface methodology (RAM) was used to optimize the reaction conditions for aldol condensation. The kinetic equation and reaction order of the aldol condensation reaction were determined using the VPO/γ-Al2O3 catalyst. It provides guidance for the in-depth study of aldol condensation reactions in the future.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1084-1091
·
IF 3.1
Gao Zhuangzhuang,Li Baoju,Ou Shuxian,Li Dongsheng,Fang Qianrong,Qiu Shilun,Xue Ming
M etal-organic frameworks (MOFs) are attractive in membrane separation due to their special pore structure and suitable aperture size. The fabrication of defect-free and robust MOF membranes with excellent durability is highly demanded but remains challenging. In this work, we report a one-step active γ -alumina conversion strategy for the facile and reliable fabrication of an MIL-96 membrane. In this case, the γ -Al 2 O 3 sol was dip-coated and sintered on the α -Al 2 O 3 disc as the active aluminum source and substrate for the nucleation and growth of MOF. A continuous and well-intergrown MIL-96 membrane was generated with exceptional stability due to the strong adhesion to the substrate. The resultant MIL-96 membrane yielded a satisfactory H 2 /CO 2 permselectivity and high-temperature resistance, delivering a selectivity of 12.35 with H 2 permeance of 6.20×10 −7 mol·m −2 ·s −1 ·Pa −1 at 150 °C. Moreover, the probe membrane presented remarkable durability and recyclability under harsh hydrothermal conditions. This method paves the way for constructing highly stable and selective MOF membranes and could accelerate the development of advanced membrane separation technologies for gas purification and recycling in addressing the severe energy and environmental problems.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Wanjia Li,Wangchang Li,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
Soft magnetic material with high saturation magnetization ( M s ) and high resistance ( ρ ) is vital to improve the power density and conversion efficient of modern electrical magnetic equipment. Yet, increasing M s is always at the expense of high resistivity, such as soft magnetic alloys substitute for the ferrite. In this work, the superior comprehensive electromagnetic properties, namely the close association of high saturation magnetization and high resistivity, are combined in a new way in a newly Fe-N based magnetic materials. A high resistance oxide interface engineering was constructed between the conducting ferromagnetic phases in the process of spark plasma sintering (SPS) to achieve superior electromagnetic properties. The ZnO composite γ' -Fe 4 N bulk has a maximum resistivity of 220 μΩ cm and a M s of up to 156.02 emu/g, while the TiO 2 composite γ' -Fe 4 N bulk has a maximum resistivity of 379 μΩ cm and a M s of 149.7 emu/g. The research findings offer valuable insights for the advancement of the next generation of soft magnetic materials, which hold significant potential for use in high-frequency, high-efficiency, and energy-saving power equipment applications.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 42
·15422-15432
·
IF 4.39
Dong Qiu,Chengli He,Yuxuan Lu,Qiaodan Li,Yang Chen,Xiaoli Cui
Photoelectrochemical water splitting is an excellent strategy for hydrogen generation and it is pivotal to the development of photoanodes with sufficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In this work, we rationally constructed a γ-graphyne/TiO2 (GY/TiO2) p–n heterojunction in which p-type γ-graphyne nanosheets were distributed in the three-dimensional space surrounding TiO2 nanotube arrays. The GY/TiO2 photoanode achieves a photocurrent density of 0.75 mA cm−2 at 1.23 V (vs. RHE), 1.7 times that of bare TiO2, and extends the electron lifetime of TiO2 from 0.51 to 1.16 ms. The improvement arises from moderate γ-graphyne modification, contributing to broadened light absorption, the suppressed recombination of electron–hole pairs, an increase in charge transfer, and a higher injection efficiency of surface electrons. This work provides a reliable approach for the utilization and conversion of sustainable solar energy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jianhui Zhao,Yuanzhou Wang,Ning Li,Shaopo Wang,Junli Yu,Xinxin Li
In this work, the magnetic γ-Fe 2 O 3 –MnO 2 bifunctional catalyst with oxygen vacancy was synthesized for peroxymonosulfate (PMS) activation under visible light. The activity of γ-Fe 2 O 3 –MnO 2 was investigated by ciprofloxacin (cipro) degradation. Results showed that 98.3% of cipro (50 μM) was removed within 30 min in visible-light/PMS system mediated by γ-Fe 2 O 3 –MnO 2 (2:1) with fine-tuned oxygen vacancy. The cipro degradation data fitted well with pseudo-first-order kinetic model with the highest kinetic constant of 0.114 min −1 . Besides, the γ-Fe 2 O 3 –MnO 2 exhibited stability, recyclability and practicability. High selectivity for cipro degradation was observed with coexisting anions in visible-light/γ-Fe 2 O 3 –MnO 2 /PMS system. Furthermore, the enhanced mechanism of PMS activation under visible light with γ-Fe 2 O 3 –MnO 2 was proposed. The appropriate oxygen vacancy enhanced the separation of photo-induced carriers and Z scheme heterostructure maintained the highest redox potential . Accordingly, the synergistic effect of photocatalysis and PMS activation enhanced cipro degradation. Free radical and non-radical species including , h + , 1 O 2 , • OH and co-existed in the coupled system. Impressively, this study provides a handy approach for oxygen vacancy regulation in metallic oxides composite and an easily recycled catalyst with high-activity in coupled oxidation system towards antibiotic degradation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHIRALITY
·
2021
·Vol. 33
·期 5
·188-195
·
IF 2.437
Miaoduo Deng,Mengyao Xue,Yanru Liu,Min Zhao
In this study, a novel hydroxypropyl-γ-cyclodextrin (HP-γ-CD) functionalized monolithic capillary column was prepared by one-pot sequential strategy and used for chiral separation in capillary electrochromatography for the first time. In one pot, GMA-HP-γ-CD as functional monomer was allowed to be formed via the ring opening reaction between HP-γ-CD and glycidyl methacrylate (GMA) catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and then copolymerized directly with ethylene dimethacrylate (EDMA) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) in the presence of porogenic solvents via thermally initiated free radical polymerization. The preparation conditions of monoliths were optimized. Enantiomer separations of six chiral drugs including pindolol, clorprenaline, tulobuterol, clenbuterol, propranolol, and tropicamide were achieved on the monolith. Among them, pindolol, clorprenaline, and tropicamide were baseline separated with resolution values of 1.62, 1.73, and 1.55, respectively. The mechanism of enantiomer separation was discussed by comparison of the HP-γ-CD and HP-β-CD functionalized monoliths.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jun Wang,Bin Li,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Yuanzhi Zhu,Wenchao Peng
In this work, γ-Al2O3-supported CuO (c-CuO/Al2O3) materials are successfully synthesized using a novel impregnation–precipitation–decomposition method. The obtained c-CuO/Al2O3 catalyst shows excellent catalytic activities for bisphenol A (BPA) degradation with sodium persulfate (PDS) as an oxidant. Radical quenching tests and electron paramagnetic resonance (EPR) studies indicate that PDS activation is a combined mechanism involving both free radical and nonfree radical pathways. In a continuous large-scale degradation process, about 1.78 L of 20 ppm BPA can be completely removed within 480 min. Although c-CuO/Al2O3 can be deactivated after several reaction cycles, the catalytic activity can be regenerated after simple aerobic calcination. X-ray photoelectron spectroscopy (XPS) and Raman analysis confirm that the deactivation of c-CuO/Al2O3 should be attributed to the conversion of Cu(II) to Cu(I). The aerobic calcination could oxidize Cu(I) back to Cu(II), thus recovering the catalytic activity. In addition, the density functional technology (DFT) and temperature-programmed oxidation (TPD) results reveal that γ-Al2O3 can not only serve as a carrier to anchor the CuO particles but also can adsorb and activate PDS by introducing more basic sites on the surface. c-CuO/Al2O3 has high activity and can be regenerated easily, thus having great potential applications for wastewater treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Linfeng Bai,Kezhu Xu,Wanquan Jiang,Min Sang,Qunling Fang,Shouhu Xuan,Xinglong Gong
Advanced nanocatalysts integrating with high activity and recyclability is one of the most important issues in heterogeneous catalysis. Magnetic hierarchical nanostructures comprising noble metal nanocrystals confined within a protecting penetrable shell will be favored as an efficient candidate toward robust catalytic reactions. This work reports a proof-of-concept magnetic separable nanocatalyst with the polydopamine (PDA)-confined-Au-nanocrystals assembled on the hierarchical surface of Fe 3 O 4 @SiO 2 @γ-AlOOH microflower (Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA). Because of the high surface area of γ-AlOOH hierarchical nanoarchitectures, the loading capacity and dispersity of Au nanocrystals are both improved. These magnetic microflowers present excellent catalytic efficiency and cycling performance in reduction of 4-nitrophenol to 4-aminophenol, which can be ascribed to the superior structure of catalyst. After 9 cycles, the activity of Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA maintains as high as 97.3% due to the protection of PDA shell. In comparison to the spherical Fe 3 O 4 @SiO 2 @Au/PDA, the as-prepared Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA microflowers exhibit quicker catalytic dynamic. The concept of hierarchical nanostructure and penetrable PDA protective layer will be instructive for fabricating high-performance nanocatalysts.
✓ 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）