FOOD HYDROCOLLOIDS
·
2025
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IF 12.4
Xi Peng,Yushi Wei,Deming Gong,Guowen Zhang
Starch intake is the main cause of postprandial hyperglycemia. This study aimed to investigate the effect of hesperetin-copper (II) complex [Hsp-Cu(II)] on the physico-chemical properties and digestibility of gelatinized corn starch (GCS). It was found that with the addition of 1.44 mg/mL Hsp-Cu(II), the digestion rate of GCS decreased from 87.0% to 52.2%, the rapidly digestible starch content reduced from 22.7% to 14.4%, and the resistant starch content increased from 18.1% to 55.0%, suggesting that Hsp-Cu(II) decreased the digestion rate of GCS by increasing the content of resistant starch. The analysis of X-ray diffraction, rheology and differential scanning calorimetry showed that Hsp-Cu(II) increased the crystallinity, viscosity, storage modulus (G′), loss modulus (G′′) and thermal stability of GCS. Fourier transform infrared spectroscopy found that Hsp-Cu(II) bound with GCS through hydrogen bonds. In addition, scanning electron microscopy showed that Hsp-Cu(II)‒GCS complex possessed a denser structure, thicker crystalline flakes and thinner amorphous flakes in comparison with GCS. Therefore, Hsp-Cu(II) may inhibit the digestion of GCS by changing the physicochemical properties and increasing the content of resistant starch of GCS, and inhibiting the activities of α-amylase and α-glucosidase at the same time by hindering the binding of GCS to the enzymes. These findings have demonstrated the potential ability of Hsp-Cu(II) to lower the level of postprandial blood glucose. This study may provide new insights into the development of Hsp-Cu(II) as a novel anti-diabetic nutritional supplement.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chenyu Zeng,Anting Ding,Xi Chen,Yongfei Ma,Hui Lin,Han Ding,Fuyu Xie,Lu Zang,Song Cui,Ping Li,Junwei Ma,Zulin Zhang
Cu/BC-PAA (Peroxyacetic acid) system was established in this study to remove sulfamethoxazole (SMX) from waters. Cu/BC-PAA achieved high elimination efficiency (91.2 %, k = 0.081 min −1 ) for SMX within 30 min. Cu (II) loaded on corn straw biochar was converted into form Cu (I) site. Characterization, electron paramagnetic resonance (EPR), and electrochemical analysis proved that Cu (I) and C O took part in the reaction, which accelerated electron transfer and produced free radicals and non-radicals (R-O· and singlet oxygen ( 1 O 2 )). Fukui index and Liquid Chromatograph Mass Spectrometer (LC–MS) analysis revealed that sulphonamide bond cleavage and isoxazole ring opening were the main detoxification pathway. Density functional theory (DFT) calculation exhibited the adsorption energy of Cu/BC (E ads = −3.68 eV) enhanced the electron transfer between Cu (I) and PAA. The evaluation of anion effects, diverse water matrices, various sulfonamide antibiotics, and catalyst cycling tests demonstrated the Cu/BC-PAA system's exceptional stability, broad-spectrum applicability, and excellent reusability. This work successfully synthesized a stable environment-friendly catalyst for efficient activating PAA to eliminate antibiotics in waters.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junfeng Yang,Jingfeng Wu,Jun Xiong,Yu Wen,Shengyan Yin,Qin Zhang
Herein, utilizing cheap carbonated beverage (Fanta) as the carbon source, the multiphasic TiO 2 /Cu-C composites are successfully designed and prepared for efficient photocatalytic H 2 generation. Excitingly, the controllable preparation of triphasic, biphasic and rutile phase TiO 2 can be achieved by adjusting the reaction temperature. As expected, under ultraviolet–visible light irradiation, the triphasic TiO 2 /Cu-C-5 exhibited the best photocatalytic H 2 evolution rate (HER, 28.53 mmol g −1 h −1 ), which is about 21.45 and 1.65 times as high as than that of triphasic TiO 2 and P25/Cu-C-5, respectively. In addition, the HER reached 7.67, 12.47 and 3.46 mmol g −1 h −1 in Tianyi lake water, Ganjing river water and Bohai seawater, respectively. Furthermore, the experiment of inorganic salt ions effect on HPR shows that NO 3 − and SO 4 2 - ions have great negative influence. This transient photocurrent response, photoluminescence and photoluminescence lifetime experiments indicate that the carrier Cu-C and the construction of heterophase junctions are conducive to the separation of photogenerated charges and reducing their recombination efficiency, resulting in the improvement of the photocatalytic hydrogen evolution performance. Meanwhile, the Cu-C sample contains hollow spheres, which facilitate the refraction of light and enhance its absorption. These advantages strongly prove that the triphasic TiO 2 /Cu-C photocatalyst has potential application prospects in the field of catalytic hydrogen evolution in deionized water and natural water.
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Solar RRL
·
2025
·
IF 4.7
Xiaoxiao Huang,Jianguo Duan,Qihui Yu,Qing Ma
Graphene composite phase change materials (PCMs) show great application potential in solar energy conversion and storage due to their strong light absorption and high thermal conductivity. To further enhance the photothermal conversion and leakage prevention performance of graphene composite PCMs. This article adopts a “point-surface” modification strategy. Through a hydrothermal reduction self-assembly method, nanocopper particles are doped into polyvinyl alcohol (PVA) cross-linked graphene nanosheets to construct a novel graphene nanosheet-nanosized Cu particle/polyethylene glycol (PEG) composite PCMs. The random distribution of nanocopper particles significantly enhances the spectrum absorption capacity and interfacial heat transfer efficiency of the graphene skeleton. The results show that the thermal conductivity of PEG/PG–Cu 0.06 reaches 0.793 W/m −1 k −1 , which is 317.4% of pure PEG. Its latent heat enthalpy value reaches 185.7 J g −1 , and the enthalpy value attenuation rate after 200 thermal cycles is less than 0.21%. Moreover, when the simulated light intensity was 120 mW cm −2 , the PEG/PG–Cu 0.06 photothermal conversion efficiency is 86.2%. Meanwhile, the cross-linked network formed by PVA and graphene can effectively inhibit PEG leakage, and the leakage rate of PEG/PG–Cu 0.06 is 21.6%. Additionally, the 3D graphene-PVA matrix modified by nano-Cu particles is used to improve the thermal conductivity and the spectrum adsorption capacity of composite PCMs, which have excellent photothermal conversion performance and thermal stability and have great application prospects in solar energy heat storage.
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ACS ES&T Water
·
2021
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IF 0
Qiang Cao,Fengyan Lou,Na Liu,Jisong Zhang,Lidong Wu
Today, the Al2O3-supported catalyst in the heterogeneous catalytic ozonation system attracts attention due to its stable structure and relatively high surface activity. Herein, Mn and Cu oxides loaded on γ-Al2O3 pellets were prepared using an impregnation method to improve the removal efficiency in a micropacked bed reactor (μPBR). The effects of the initial pH, the ratio of O3 to chemical oxygen demand (COD), and HO• scavenger on the catalytic performance were investigated. Experimental results showed that the MnO2/γ-Al2O3 and CuO/γ-Al2O3 catalysts exhibited excellent catalytic performance. The COD removal efficiencies were 86.3% for CuO/Al2O3, 76.9% for MnO2/Al2O3, 71.6% for Al2O3, and 35.8% for ozone alone within 71 s. Compared with those of batch reactors, the apparent degradation rate constant of COD with prepared catalysts in a μPBR increased by 2–3 orders of magnitude. In addition, the CuO/γ-Al2O3 catalyst maintained a relatively stable activity in the continuous flow test for a long time (100 h). Finally, some typical antibiotics were treated by catalytic ozonation in a μPBR. The removal efficiencies of these antibiotics and COD reached approximately 100.0% and 62.9–87.8% within 71 s, respectively. Thus, the continuous catalytic ozonation system with the CuO/γ-Al2O3 catalyst based on μPBRs could be a promising pathway for the treatment of industrial wastewater with antibiotics.
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JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2024
·Vol. 150
·期 5
·04024016
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IF 1.6
Chenglong Zou,Qun Wu,Kun Guan,Fahui Nie,Sulin Xiang
Biochar with abundant functional groups, porous structure, and high specific surface area has been widely used as an adsorbent for the removal of metal ions, and its low production costs make it economically suitable for large-scale application in various industries. Hydroxyapatite nanoparticles were used to functionalize magnetic rice husk biochar (MBC) to produce hydroxyapatite functionalized magnetic rice husk biochar (HAP@MBC) in this study. The functional groups, magnetism performance, surface morphology, and aperture structure of HAP@MBC were characterized to explore the feasibility of its application in the treatment of wastewater containing Cu(II) ions. It is found that the maximum adsorption removal rate reaches 96.02% at 35°C, pH=5.0, with an adsorbent dosage of 0.65 g/L and an initial Cu(II) ion concentration of 50 mg/L. Additionally, adsorption kinetics, isotherms, and thermodynamics were analyzed to probe into the adsorption mechanism of Cu(II) ions by HAP@MBC. The results show that the adsorption process is very close to the pseudo-second-order model, indicating that the adsorption process is mainly controlled by chemisorption. The adsorption of Cu(II) ions can also be fitted by the intraparticle diffusion model, revealing that the adsorption rate is limited by intraparticle diffusion as well as other factors. Moreover, the adsorption process is consistent with the Langmuir isotherm, and the saturated adsorption capacity is calculated to be 81.59 mg/g. Thermodynamic analysis shows that the value of adsorption enthalpy change is 48.35 kJ/mol, suggesting the adsorption process is chemisorption. More precisely, it is a spontaneous entropy-increasing reaction, and an increase in the temperature is conducive to the adsorption. To sum up, HAP@MBC exhibits perfect adsorption properties and has the potential to be a novel and promising adsorbent for the removal of Cu(II) ions.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Guansheng Ma,Yuefeng Yan,Yuming Feng,Kaili Zhang,Boshi Gao,Jun Weng,Guangyu Qin,Seeram Ramakrishna,Xiaoxiao Huang
To cope with different environments of application, electromagnetic wave absorption (EWA) materials with multifunctionality have attracted a wide range of interests. And excessive heavy metal ions in aqueous solutions seriously affect people’s health and pose a major challenge to environmental safety. In this study, carbon microtube/carbon nanotube (CMT/CNT) composites were fabricated via carbonization and chemical vapor deposition (CVD) methods. The CNT wrapped with cobalt nanoparticles were grown in situ on the CMT which derived from kapok fiber. By varying the concentration of cobalt precursors, the EWA and Cu(II) adsorption performances of CMT/CNT can be efficiently tuned. Optimizing the cobalt content to 2 wt% resulted in a minimum reflection loss ( RL ) of −66.14 dB at a matching thickness of 1.91 mm, with an effective absorption bandwidth (EAB) of 5.35 GHz. The adsorption capacity of Cu(II) by the CMT/CNT composite can reach 102.01 mg/g when the initial Cu(II) concentration is 500 mg/L. This research not only shows great promise for applications in the field of EWA materials but also holds significant potential for heavy metal ion removal and as a catalyst carrier, among other areas.
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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
·
2024
·
IF 1.3
Wenbin Jin,Nan Liu,Fang Cheng,Zongqing Ma,Yongchang Liu,Pingzhan Si,Hongliang Ge
We report the C substitution effects in MgB 2 bulks on the lattice parameters, FWHM, and critical current density ( J c ) as a function of doping level. It is shown that using carbon-coated boron powder can effectively control the grain growth of MgB 2 during the whole sintering process. Accompanied by the rapid cooling process, the final average grain size can be restrained within merely 50 nm, and the J c value of the sample can be significantly improved at high field. On top of that, adding Cu is also considered a key factor in improving the current carrying property of the graphene-doped sample throughout the whole field, which can be attributed to the formation of the MgCu 2 alloy phase.
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ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Ting-Hong Huang,Cheng Luo,Dan Zheng
Cationic and neutral mononuclear Cu(I) complexes, [Cu(PPh 3 ) 2 (PmH)]BF 4 (1a), [Cu(DPEphos) (PmH)]BF 4 (2a), [Cu(Xantphos) (PmH)]BF 4 (3a), [Cu(PPh 3 ) 2 (Pm)] (1b), [Cu(DPEphos) (Pm)] (2b) and [Cu(Xantphos) (Pm)] (3b) (PPh 3 = triphenylphosphine , DPEphos = bis(2-diphenylphosphinophenyl)ether, Xantphos = 9, 9-dimethyl-bis(diphenylphosphino)xanthenes, PmH = 2-(pyridin-2-yl)benzimidazole, Pm=(2-(Pyridin-2-yl)benzimidazolate), have been prepared and characterized by IR, 1 H NMR, 13 C NMR, 31 P NMR, XRD, elemental analysis and X-ray crystal structure analysis. The structural analysis shows that each of Cu(I) complexes includes a tetrahedral [Cu(NN) (PP)] + moiety, and temperature variation from 99 K to 298 K leads to the change of bonds lengths, angles and weak interactions. Meanwhile, theoretical calculations indicate that the differences between cationic and neutral Cu(I) complexes affect the composition of HOMO and LUMO orbitals, and the effect of temperature on Mülliken atomic charges is limited. Furthermore, neutral Cu(I) complexes 1b–3b show better luminescence in comparison to cationic Cu(I) complexes 1a-3a at room temperature , and temperature variations from 99 K to 298 K result in changing photoluminescence to some extent, which partly agrees with the related calculation results. In these cationic and neutral Cu(I) complexes, the maximum phosphorescent lifetime and quantum yield reach respectively 137 μs and 42% at room temperature. Moreover, cationic and neutral Cu(I) complexes are utilized to fabricate the monochromatic LEDs, showing favorable electroluminescence with the maximum EQE of 7.10%.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Xiaorong Gan,Huimin Zhao,Xie Quan,Yaobin Zhang
An ultrasensitive electrochemical sensor for Cu 2+ detection was first developed based on p-aminothiophenol (PATP) anchored on the surface of Au nanoparticle-decorated hydrogen-incorporated TiS 2 nanosheets (PATP/Au-H x TiS 2 ). In the synthesis process, the plane edges of H x TiS 2 nanosheets offered Au nanoparticles with incubation sites for the heterogeneous nucleation and growth. On the other hand, Au nanoparticles were not only served as an excellent electrical catalyst to facilitate electron transfer and as a substrate for loading PATP molecules by Au-S valent bonds, but also could effectively avoid the aggregation of H x TiS 2 nanosheets . Due to the synergetic effects from Au-H x TiS 2 for signal amplification, the as-formed electrochemical sensor exhibited highly sensitive and selective assaying of Cu 2+ with a detection limit of 90 pM (3σ) and a linear range from 0.2 nM to 5 μM, under optimal conditions. Its specificity was ascribed to the strong coordination interaction between Cu 2+ and N atoms of imine moieties in PATP after electrochemical oxidation .
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qingming Song,Ya Liu,Lingen Zhang,Zhenming Xu
With a huge amount of waste liquid crystal displays (LCDs) generated annually, their proper recycling raises continuous concern to realize pollution control (heavy metal and liquid crystal) and resource recovery (indium). However, due to their multi-metal feature, traditional hydrometallurgy lacks of sufficient selectivity, which makes the recycling route lengthy, costly, and generate more waste. Electrodeposition acts as a promising technique for selective metal extraction from multi-metal system due to its high selectivity and electron as clean reagent. To fully develop its application in metal recovery, stepwise Cu/MoO 2 and In electrodeposition from In-Cu-Mo-Fe waste LCD leachate is explored in depth. Electrochemical behavior analysis shows Cu and MoO 2 can be first electrodeposited for their higher electroreduction potential. Cl - plays a key role in accelerating indium electroreduction kinetics, which largely shortens the extraction time without the sacrifice of current efficiency . This accelerating effect is attributed to the increased concentration of electroactive species or collision frequency . Under optimized condition, 99.41% of indium (> 99% purity) can be electrodeposited within 13 h with high current efficiency. This study provides a cleaner approach for waste LCDs recycling and gives implications for the potential application of electrochemical technique in e-waste recycling.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lixian Wang,Lizhi Zhao,Didi Si,Zhixin Li,Huiqin An,Hui Ye,Qingping Xin,Hong Li,Yuzhong Zhang
Metalloporphyrin-based nanozymes are effective peroxidase-like catalysts for dye degradation; however, their reusability is a challenge due to the nanoscale dimensions. Membrane technology has the advantages of high efficiency, low energy consumption, and easy operation. Here, we integrate poly (vinylidene fluoride) (PVDF) membrane with nanozyme for effective decolorization of Congo Red (CR). A nanozyme (Cu@Cu-FeTCPP) is prepared by growth of copper hydroxide-copper oxide (Cu(OH) 2 -CuO) nanocomposites onto the metal organic framework (MOF) nanosheet consisting of tetrakis-(4-carboxyphenyl)-porphyrin iron ligands and cupric ion nodes. The functional membrane is achieved by loading Cu@Cu-FeTCPP nanozyme on the PVDF membrane surface (Cu@Cu-FeTCPP/PVDF). The as-prepared membrane shows catalytic activity for the degradation of CR. Under flow through conditions, the catalytic degradation in tangential flow plays a major role in overall decolorization of CR, far exceeding the contribution of adsorption. The membrane can rapidly catalyze the dye degradation even at different operating pressures (0.1–0.7 kPa) and feed solutions with higher CR concentrations (eg. 60 mg·L -1 ). Compared with the static batch catalysis and the free nanozyme catalysis, the membrane exhibits higher decolorization efficiency and outstanding reusability in the continuous flow process owing to the promoted mass transfer. After 40 min of continuous flow reaction in a feed solution containing CR (40 mg·L -1 ) and H 2 O 2 (50 mM), the decolorization efficiency approaches 90% and remains above 85% after five catalytic cycles. The membrane with enzyme-mimicking ability has application prospect in wastewater treatment.
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