NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 3
·1158-1167
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IF 3.591
Huan Fu,Huan Zhang,Guichun Yang,Jun Liu,Junyuan Xu,Peihuan Wang,Ning Zhao,Lihua Zhu,Bing Hui Chen
Catalysts of 0.54% (Pt, Rh, Pd or Ru)/Co(OH)2 and 1.23% Rh/Co(OH)2 were successfully synthesized via simple hydrothermal and precipitation methods for the selective hydrogenation of nitroarenes. It was found that 0.54% Rh/Co(OH)2 outperformed other catalysts, for example, 2-chloronitrobenzene hydrogenation (with a turnover frequency (TOF) of 575 h−1) under 3.0 MPa H2 at 100 °C for 1 h (much higher than that of 1.23% Rh/Co(OH)2; TOF, 398 h−1). Through characterization of the nanostructure (XRD, TEM, HRTEM, AC-STEM (spherical aberration-corrected scanning transmission electron microscopy), AC-STEM-EDX elemental mapping and line-scanning, H2-TPD, etc.), it was confirmed that Rh was dispersed in the form of single atoms and ultrasmall nanoclusters on Co(OH)2 for 0.54% Rh/Co(OH)2. Moreover, 0.54% Rh/Co(OH)2 also exhibited high selectivity for –NO2 hydrogenation for other selected nitroarene substrates hydrogenation reactions. This was mainly attributed to the presence of Rh as single atoms or super tiny nanoclusters in 0.54% Rh/Co(OH)2, leading to a significant increase in the number of active sites, beneficial adsorption of the –NO2-group at defect-rich Co(OH)2, and an interfacial synergy effect of Rh–Co(OH)2, thus improving the catalytic performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Dengke Zhao,Shunlian Ning,Xiaolong Yu,Qikai Wu,Wei Zhou,Jiacheng Dan,Yuguang Zhu,Hao Zhu,Nan Wang,Ligui Li
The exploration of efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) under alkaline conditions is an important way to promote the development of electrolytic water technology . Herein, the reduced graphene oxide-supported MoO 4 2- modified amorphous cobalt metaphosphate cubes (a-Co(PO 3 ) 2 /MoO 4 /rGO) as bifunctional OER/HER catalyst is prepared by anion exchange and phosphating, using the Prussian blue analogue (PBA) as a precursor. The resulting composite exhibits the low overpotentials (η) that of 290 and 50 mV for OER and HER in 1.0 M KOH solution at 10 mA cm −2 , respectively. The electrochemical test and density functional theory (DFT) results reveal that the MoO 4 2- -modified optimizes the adsorption/desorption energy of H* of Co(PO 3 ) 2 , thus enhance the HER activity. Benefiting from efficient HER and OER performances, an efficient and stable alkaline water electrolysis operation using a-Co(PO 3 ) 2 /MoO 4 /rGO used as bifunctional catalyst can be carried out, which can deliver a current density (j) of 20 mA cm −2 at 1.65 V cell voltage and work continuously for 24 h.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zhiyan Hou,He Meng,Xueqing Shao,Xianglong Wang,M. Usman Tahir,Shakiaz Ahmad,Chao Yang,Xintai Su,Lijuan Zhang
The complex composition and recycling process of electroplating sludge are the two major obstacles restricting the recycling of metal resources. In this work, Ni(HCO 3 ) 2 hollow spheres with unique amorphous structure were prepared via a simple and controllable hydrothermal method using nickel-containing electroplating sludge as raw material and ascorbic acid (AA) as complexing agent . The introduction of AA not only changed the morphology of the sample, but also formed pure phase Ni(HCO 3 ) 2 . The controllable amorphous structure is beneficial to the diffusion of OH - in the electrolyte. More importantly, its disordered atomic arrangement and metastable structure provide a large number of active sites and ion transmission channels, which improve the specific capacity. Consequently, amorphous Ni(HCO 3 ) 2 delivers a large capacitance of 599.8 C g −1 at 1 A g −1 , besides large capacitance, it also exhibits large rate capability (61.02% at a current density of 10 A g −1 ) and cycle performance (capacitance retention 52.09% after 1000 cycles). Importantly, the recoveries of nickel, iron and aluminum are 95.57%, 99.92% and 92.30%, respectively, indicating that electroplating sludge has a good application prospect as electrode materials for supercapacitors .
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JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Qian Chen,Xuanming Zheng,Fang Guo,Kun Liang,Fanrui Zhou
α-Aminophosphonate analogues containing a phthalazine skeleton were efficiently obtained by a new transition-metal-free addition of dialkyl phosphites to phthalazin-2-ium bromide under mild conditions. A mechanistic study using isotope labeling and radical inhibition experiment revealed that the present transformation passes through a nucleophilic addition of dialkyl phosphates, rather than an insertion of P-H to carbenes.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shuo Yan,Yun Li,Jilin Cao
The calcium nitrate (Ca(NO 3 ) 2 ) waste generated from the production of nitrophosphate fertilizers brings about serious environment and human health issues. Using Ca(NO 3 ) 2 waste and ammonium bicarbonate (NH 4 HCO 3 ) fertilizer as raw materials, higher-value spherical calcite mesocrystals have been synthesized via precipitation method. The synthesis conditions are optimized from the aspects of dispersant, crystal control agent and reaction temperature, and the mechanism that regulates the size and morphology of calcite is illustrated. The synthesized spherical calcite mesocrystals exhibit the small particle size of ca. 5 µm and high specific surface area of 84.44 m 2 /g. Under the dispersion effect of polyvinylpyrrolidone, the adsorption of crystal control agent citric acid on the calcite particles results in the formation of the spherical mesocrystal morphology. The yield of calcite in this process could reach 94.3%. Ca 2+ ion remaining in the mother liquor are further removed in the form of CaCO 3 by addition of calcium oxide , and a mixture of ammonium nitrate and a small amount of NH 4 HCO 3 is obtained by concentrating the filtrate, which can be used as nitrogen fertilizers. This work provides a new insight into the low-cost synthesis of spherical calcite mesocrystals with the high specific surface area and the comprehensive utilization of Ca(NO 3 ) 2 waste.
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INTERNATIONAL DAIRY JOURNAL
·
2021
·
IF 3.032
Xin Hu,Yaping Pan,Mutai Bao,Xiuli Zhang,Chengyi Luo,Xiao Han,Fengshu Li
A novel exopolysaccharide (APS) was secreted by Chryseobacterium sp. AP-2. The yield of APS reached 3.247 g L −1 in MRS medium with 2% (w/v) maltose during 72 h incubation. The APS was a 4.871 × 10 5 Da heteropolysaccharide with rhamnose, fucose, mannose , glucose and galactose ; using Fourier transform infrared spectroscopy , the main groups in APS were found to be hydroxyl and phosphate groups. APS exhibited a flaky structure with irregular holes, and its structural composition was confirmed by 1 H and 13 C nuclear magnetic resonance analysis. The degradation temperature (197.3 °C) of APS was determined by thermogravimetric analysis. APS exhibited stable emulsification property with the higher emulsification indexes (EI) than 50% in the diesel oil and kerosene. Ultimately, physicochemical factor (temperature, pH values and salts) had an impact on rheological properties of APS. The properties and structure characterisation of APS laid the experimental foundation for further exopolysaccharide exploration.
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FOOD CHEMISTRY
·
2019
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IF 5.399
Nuan Feng,Haiyang Zhang,Yao Li,Yangkaixi Liu,Longquan Xu,Yi Wang,Xu Fei,Jing Tian
Milk allergenic proteins are the main reason of cow’s milk allergy. The most common method for removing milk allergenic proteins is enzymatic hydrolysis . However, the direct application of protease to hydrolyze allergens will lead to the introduction of new allergenic proteins. An ideal strategy for removing milk allergenic proteins without introducing new allergenic proteins is immobilization of protease. Herein, we established a simple method to synthesize a novel papain-Cu 3 (PO 4 ) 2 ·3H 2 O–magnetic nanoflowers (PCMNs). The PCMNs demonstrated 1556% higher activity than the free alkaline papain . Moreover, the PCMNs could hydrolyze most of allergenic proteins in cow’s milk, generating low-sensitive milk. In cycle analysis, the PCMNs also exhibited good reusability and were easily separated from the product.
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ANALYTICAL CHEMISTRY
·
2022
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IF 8.008
Fajin Qu,Jiangnan Shu,Shanshan Wang,Mohammad A. Haghighatbin,Hua Cui
It is highly desired to exploit good nanomaterials as nanocarriers for immobilizing chemiluminescence (CL) reagents, catalysts and antibodies to develop signal probes with intensive and stable CL properties for immunoassays. In this work, N-(4-aminobutyl)-N-ethylisoluminol (ABEI) and Co2+ bifunctionalized polymethylacrylic acid nanogels (PMAANGs-ABEI/Co2+) were synthesized via a facile strategy by utilizing carboxyl group-rich PMAANGs as nanocarriers to immobilize ABEI and Co2+. The obtained PMAANGs-ABEI/Co2+ showed extraordinary CL performance. The CL intensity is 2 orders of magnitude higher than that of previously reported ABEI and Cu2+–cysteine complex bifunctionalized gold nanoparticles with high CL efficiency. This was attributed to the excellent catalytic ability of Co2+ and polymethylacrylic acid nanogels, as well as the improved CL catalytic efficiency from a decreased spatial distance between ABEI and the catalyst. The as-prepared nanogels also possess abundant surface reaction sites and good CL stability. On this basis, a sandwich immunoassay for the nucleocapsid protein of SARS-CoV-2 (N protein) was developed by using magnetic bead connected primary antibody as a capture probe and PMAANGs-ABEI/Co2+ connected secondary antibody as a signal probe. The linear range of the proposed method for N protein detection was 3.16–316 ng/mL, and its detection limit was 2.19 ng/mL (S/N = 3). Moreover, the developed immunoassay was performed with a short incubation time of 5 min, which greatly reduced the detection time for N protein. By using corresponding antibodies, the developed strategy might be applied to detect other biomarkers.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chen Yang,Xuefeng Hu,Yao Huang,Baiyu Liu,Junhan Yang
We report a rational and scalable synthetic approach to prepare Fe-decorated carbon nitride materials assisted by carbonized polyamine (C-Fe@PDA-CN). The material exhibited extremely high activity and stability for the degradation of 2-mercaptobenzothiazole (MBT) and other organic pollutants (phenol, BPA , MB , and RhB) under visible light irradiation. Furthermore, escape from CN to C-Fe@PDA provides an electron transfer channel to facilitate carrier separation and accelerate the generation of active species, as confirmed by photoluminescence , photoelectrochemical, and electron paramagnetic resonance (EPR). Fe exists in the material coordinated with the pyrrole nitrogen of polydopamine. This coordination structure is conducive to the generation of singlet oxygen ( 1 O 2 ). It is confirmed by steady-state phosphorescence spectroscopy (PH) that 1 O 2 originates from electron transfer. Superoxide radicals are generated by electron transfer and then oxidized into 1 O 2 by holes. The main intermediates of MBT degradation were identified by the LC-MS method, and a possible photocatalytic mechanism based on quenching experiments and EPR tests was proposed.
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POWDER TECHNOLOGY
·
2026
·
IF 5.5
Shi-Peng Deng,Xue-Fei Peng,Hong-Lei Yan,Zhan-Ku Li,Jing-Chong Yan,Wei-Dong Zhang,Shi-Biao Ren,Zhi-Cai Wang,Shi-Gang Kang,Heng-Fu Shui,Zhi-Ping Lei
Bio-based 2-MTHF is a green alternative for efficient lignite wax extraction. • 2-MTHF achieved 7.9 wt% yield, a 58% increase over toluene extraction. • Crude wax yield reached 5.3%, approaching China's National Grade II standard. • Low activation energy (9.02 kJ·mol −1 ) confirms efficient matrix disruption. Lignite, which is rich in high-value montan wax, is currently mostly burned directly, resulting in a waste of resources. At the same time, traditional toluene extraction methods are facing increasingly stringent regulations due to their toxicity and environmental risks, which hinders the efficient utilization of resources and the adoption of environmentally preferable production routes. This study proposes the bio-based solvent 2-methyl tetrahydrofuran (2-MTHF) as a greener and more efficient alternative to toluene. 2-MTHF can effectively penetrate the pores of the lignite matrix, disrupting non-covalent interactions (such as hydrogen bonds) between wax molecules and the coal matrix, thereby achieving selective and efficient dissolution. Under mild conditions (140 °C, 60 min, solid-to-liquid ratio 1:10, particle size 0.15–0.25 mm), the 2-MTHF extract rate reached 7.9 wt%, a 58% increase compared to toluene (5.0 wt%) under the same conditions; the defatted montan wax yield was 5.3%, also higher than that of toluene (3.3%) (an increase of approximately 61%), and the crude wax product approaches China's National Grade II standard, with a resin content of 33.3% slightly above the 27% limit, while its acid value and saponification value comply with the Grade II requirements. Kinetics and mass transfer analysis indicated that the process follows a first-order kinetic model, with an apparent activation energy of only 9.02 kJ·mol −1 , and is controlled by intraparticle diffusion, further confirming that 2-MTHF can effectively weaken non-covalent interactions within lignite and promote the selective leaching of wax. Download: Download high-res image (128KB) Download: Download full-size image
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International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 11
·2236-2244
·
IF 4.8
Liu Hongyuan,Wu Jialei,Wang Siqi,Duan Jing,Shao Huiping
Porous magnesium strontium phosphate (Sr 3− x Mg x (PO 4 ) 2 ) ( x = 2, 2.5, 3) composite scaffolds were successfully prepared by three dimension gel-printing (3DGP) method in this study. The results show that Sr 0.5 Mg 2.5 (PO 4 ) 2 scaffolds had good compressive strength, and Sr 1.0 Mg 2.0 (PO 4 ) 2 scaffolds had good degradation rate in vitro. The weight loss rate of Sr 1.0 Mg 2.0 (PO 4 ) 2 scaffolds soaked in simulated body fluid (SBF) or 6 weeks was 6.96%, and pH value varied between 7.50 and 8.61, which was within the acceptable range of human body. Preliminary biological experiment shows that MC3T3-E1 cells had good adhesion and proliferation on the surface of Sr 3− x Mg x (PO 4 ) 2 scaffolds. Compared with pure Mg 3 (PO 4 ) 2 scaffolds, strontium doped scaffolds had excellent comprehensive properties, which explain that Sr 3− x Mg x (PO 4 ) 2 composite scaffolds can be used for bone tissue engineering.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2020
·
IF 5.573
Heping Zhu,Shilong Ying,Bingluo Zhou,Xiao Liang,Quan He,Ping Song,Xinyang Hu,Keqiang Shi,Mingteng Xiong,Hongchuan Jin,Yuanjiang Pan
Microtubules play a vital role in cell mitosis. Drugs targeting taxol or vinca binding site of tubulin have been proved an effective way to against cancer. However, drug resistance and cancer recurrence are inevitable, there is an urgent need to search for new microtubule-targeting agents (MTAs). In our study, a series of novel 2-aryl-3-sulfonamido-pyridines ( HoAns ) had been designed, synthesized, and evaluated for their antiproliferative activities in vitro and in vivo . Among them, compound HoAn32 exhibited the most potent activity with IC 50 values ranging from 0.170 to 1.193 μ M in a panel of cancer cell lines. Mechanism studies indicated that compound HoAn32 bound to the colchicine site of β-tubulin, resulting in colony formation inhibition, G2/M phase cell cycle arrest, cell apoptosis as well as increased the generation of ROS in both RKO and SW620 cells. In addition, compound HoAn32 showed potent anti-vascular activity in vitro . Furthermore, compound HoAn32 also exhibited outstanding antitumor activity in SW620 xenograft tumor models without observable toxic effects, which was more potent than that of ABT-751 . In conclusion, our findings suggest that compound HoAn32 may be a promising microtubule destabilizing agent and deserves for further development in cancer therapy.
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