Materials Research Express
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2022
·Vol. 9
·期 6
·065505
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IF 2.025
Qinghong You,Xiulian Yin,Jun Wang,Chunhua Dai
A recyclable heterogeneous KF/Ca-Mg-Al-O catalyst was prepared by co-precipitation and calcination processes. The characteristics of the catalyst were investigated using FTIR, XRD, TG-DTG and SEM. Response surface methodology was utilized to obtain the best most extreme biodiesel production yield. The ideal biodiesel production conditions were: the amount of catalyst was 3 wt%; the reaction temperature was 65 °C; the alcohol oil molar ratio 9.8:1, the reaction time was 3.5 h. Under these amended conditions, the average biodiesel yield was 95.19%, which is well in close concurrence with the worth anticipated by the model. The repeatability of catalysts was studied. After using the catalyst seven times, the catalytic efficiency was only reduced by 2.7%. These results indicate that the catalyst has good catalytic efficiency and is recyclable.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Xiang Huang,Rui Tu,Hongbo Song,Kai Dong,Fang Geng,Lei Chen,Qun Huang,Yingmei Wu
Vitamin C is an essential nutritional supplement and antioxidant in food. However, the development of vitamin C in the food industry is limited due to its extremely poor chemical stability. In this study, W 1 /O/W 2 double emulsions loaded with vitamin C were prepared, and their structure, physicochemical stability, and in vitro gastrointestinal digestion were investigated. The results manifested that the encapsulation efficiency was the highest (90.23 ± 0.49 %) when the addition of vitamin C in the internal aqueous phase was 0.05 %. Storage stability revealed that no phase separation occurred and did not show stratification in the emulsion system during storage, and the physical stability was excellent. pH stability demonstrated that the W 1 /O/W 2 double emulsion loaded with vitamin C had a lower polydispersity index (PDI) value (0.19 ± 0.01) and greater absolute zeta potential value (40.37 ± 0.48) in alkaline environment (pH 8.0–12.0). The ionic stability suggested that the double emulsion was less stable in the presence of sodium ions. In vitro gastrointestinal digestion indicated that the bioavailability of vitamin C was 25 % after simulated digestion in vitro , elucidating that the W 1 /O/W 2 double emulsion loaded with vitamin C was released slowly in the small intestine and had a certain sustained-release function.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yaqiong Zhang,Xu Xu,Lei Zhang
Accurate on-site profiling of the pollutants is of vital significance for estimating environmental pollution . Herein, we propose a paper-based fluorescence-sensing system to precisely report the level of multiple pollutants. A high-performance fluorescence-sensor for apparatus-free and visual on-site tandem precisely reporting phosphate ions (Pi), o -phenylenediamine (OPD), and benzaldehyde (BA) levels have been fabricated successfully by introducing synthesized red emission (>600 nm) fluorescent chromophore 10-(diethylamino)-3-hydroxy-5,6-dihydrobenzo [c]xanthen-12-ium (HTD) into the environment of CoZn zeolitic imidazolate framework (CoZn ZIF) by a simple stirring method. CoZn ZIF@HTD with the bimetallic nodes not merely provided main Zn 2+ sites for specific recognition of Pi to generate an enhanced red fluorescent optical signal , Co 3+ /Co 2+ exhibited excellent peroxidase-like activity for the catalytic oxidation of OPD substrate in the presence of H 2 O 2 resulting in color changing from red to yellow. Subsequently, the obvious yellow fading of the OPDox species took place with the addition of BA. By virtue of the sensitively visual tandem detection of Pi, OPD, and BA, the sensor can be applied to real wastewater samples. Meanwhile, this fluorescent sensor was further adopted for practical application in confocal cell imaging and security inks. Overall, this work established a fluorescent sensing system with integrated multifunctional applications for environmental and biological samples, implying the great potential for simultaneous real-time cascade detection of various important pollutants with the merit of low-cost, time-saving, and easy-to-use.
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Foods
·
2021
·Vol. 10
·期 10
·2387
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IF 4.35
Huan Liu,Teng Hui,Fei Fang,Qianli Ma,Shaobo Li,Dequan Zhang,Zhenyu Wang
The key aroma compounds in the pre- and postrigor roasted mutton were studied in this study. The results showed that 33 and 30 odorants were detected in the pre- and postrigor roasted mutton, respectively. Eight aroma compounds, including 3-methylbutanal, pentanal, hexanal, heptanal, octanal, nonanal, 1-octen-3-ol, and 2-pentylfuran, were confirmed as key odorants by aroma recombination and omission experiments. The aroma profiles of pre- and postrigor roasted mutton both presented great fatty, roasty, meaty, grassy, and sweet odors. Particularly, the concentrations of hexanal, heptanal, octanal, nonanal, 1-octen-3-ol, and 2-pentylfuran in postrigor roasted mutton were significantly higher (p< 0.05) than those in the prerigor roasted mutton. The postrigorback strapwas more suitable for roasting than the prerigorback strap. The pre- and postrigor roasted mutton could be obviously discriminated based on the aroma compounds by orthogonal partial least squares discrimination analysis (OPLS-DA) and principal component analysis (PCA). Hexanal and 1-octen-3-ol might potential markers for the discrimination of the pre- and postrigor roasted mutton.Keywords:roasted mutton;pre- and postrigor;key aroma compounds;marker;recombination and omission experiments
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
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IF 5.279
Xiaoli Song,Yang Lu,Yongling Lu,Lishuang Lv
Acrolein (ACR) derives from the external environment and the endogenous metabolism of organisms. It has super-reactivity and can induce various diseases. We investigated the capacity of cyanidin-3-O-glucoside (C3G) and its degradants/metabolites to capture ACR during thermal processing or in vivo. Our results indicated that both C3G and its degradants, including phloroglucinaldehyde (PGA) and protocatechuic acid (PCA), could efficiently trap ACR to form adducts, such as C3G–ACR, C3G–2ACR, PGA–ACR, PGA–2ACR, PCA–ACR, and PCA–2ACR. Additionally, these adducts were detected in commercial canned red bayberry products. The adducts of C3G and its metabolites conjugated with ACR, such as C3G–ACR, C3G–2ACR, PGA–ACR, and 4-hydroxybenzoic-acid–ACR (4-HBA–ACR), were also detected in mice feces treated with C3G by oral gavage, where the adduct level was dose-dependent. A similar pattern was observed in tests on human consumption of red bayberry. In human urine, only PGA–2ACR and 4-HBA–ACR, were found, whereas C3G–ACR, C3G–2ACR, myricetin-3-O-rhamnoside–ACR (M3R–ACR), PGA–2ACR, 4-HBA–ACR and ferulic acid–ACR (FA–ACR) were detected in human feces following administration of red bayberry. Our results are the first demonstration that C3G and its metabolites can capture ACR in vitro and in vivo (mice and humans) and present a novel strategy, the development of C3G as a promising ACR inhibitor.
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FUEL
·
2021
·
IF 6.609
Yishuang Wu,Zixiang Lin,Xun Zhu,Xun Hu,Mortaza Gholizadeh,Hongqi Sun,Yong Huang,Shu Zhang,Hong Zhang
Catalytic hydrogenolysis of lignin to phenolic monomers has received a lot of attention, but it is still a challenge because the cleavage of the strong C(sp 2 )-O/C bonds between structural units is usually under harsh conditions, resulting in the presence of the competing reaction of hydrogenation. Herein, hydrogenolysis of an herbaceous lignin into phenolic monomers was performed over Ru supported on various (non)-functionalized graphitized carbon nanotubes (CNT, CNT-OH, CNT-COOH, and CNT-NH 2 ), which were featured by different hydrogenation performances originally from the diverse metal-support interactions. Among the investigated supports, CNT-NH 2 enables the formation of the finest Ru nanoparticles with an average size of 1.86 nm, leading to the highest yield of phenolic monomers from lignin hydrogenolysis. The best hydrogenolysis performance of Ru@CNT-NH 2 was mainly from the partial hydrogenation of C(sp 2 )-O/C bonds to C(sp 3 )-O/C bonds in lignin, thus reducing their bond dissociation energy (BDE). The intimacy between hydrogenolysis and hydrogenation was further proved by depolymerization of a lignin β-O-4 model compound.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hairus Abdullah,Yu-Rou Ko,Dong-Hau Kuo,Noto Susanto Gultom
La–Sn-codoped Zn(O,S) catalysts were synthesized with different amounts (0%, 2.5%, 5%, and 10%) of Sn and a constant amount (10%) of La to improve the photocatalytic hydrogenation reaction (PHR) of azobenzene to aniline. The as-prepared catalysts were carefully characterized and tested for a hydrogenation reaction. The incorporation of Sn significantly enhanced the PHR activities since the incorporated Sn in the Zn(O,S) lattices could increase the conductivity of the catalysts to improve the charge transfer during the catalytic reaction as indicated with EIS measurement. Further measurement with a photoresponse of La–Sn-codoped Zn(O,S) catalysts also exhibited relatively higher intensities as compared to those of La-doped Zn(O,S) and Sn-doped Zn(O,S) catalysts. On the basis of the measurement results of EIS and transient photo current, the La–Sn-codoped Zn(O,S) with the best properties was further utilized for PHR to convert azobenzene to aniline. GC–MS measurement confirmed that 15 ppm azobenzene could be totally converted to aniline in only 60 min which was achieved with a catalyst that was prepared with 5%-Sn and 10%-La doping. The relatively short reaction time indicated that the as-prepared catalyst had a strong reduction capability able to cleave the strong bonding of N═N in azobenzene. The reaction kinetic of the N═N bond cleavage was elucidated based on solvation, adsorption, pinning, and photocatalytic hydrogenation processes on the catalyst surfaces.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Yaxin Zheng,Zexiu An,Weihua Liu,Minghua Wang,Yichun Ren,Dongchen Yang,Wei Gao,Ningzhao Shang,Jinlin Zhang,Chun Wang,Shutao Gao
Nitrogen vacancy incorporation into Co 4 N-600 upshifts the D-band center and facilitates the generation of Co IV =O. • The Co 4 N-600/PMS system yields a modified kinetic rate constant of 300.6 min⁻ 1 M⁻ 1 . • Rapid degradation of different types of pollutants within Co 4 N-600/PMS system. High‑valent cobalt-oxo species (Co IV =O) have been demonstrated to exhibit efficient degradation capability toward emerging contaminants (ECs). However, the 3d 7 electronic configuration of Co(II) sites in Co‑based catalysts severely restricts their binding affinity to the terminal oxygen of peroxymonosulfate (PMS), which is unfavorable for the generation of Co IV =O. Herein, we report a nitrogen vacancy (Nv)‑rich cobalt nitride nanozyme Co 4 N-600. The introduction of Nv markedly reduces the d‑electron occupancy of Co, upshifts the d‑band center, and promotes the formation efficiency of Co IV =O. Remarkably, employing 150 mg L −1 peroxymonosulfate (PMS) as the oxidant, the Co 4 N-600 nanozyme achieves complete degradation of 10 mg L −1 imidacloprid within 10 min at an ultralow catalyst loading of 1 mg L −1 , yielding an excellent modified kinetic rate constant of 300.6 min −1 M −1 . These findings establish d -band center engineering as an effective strategy for boosting the catalytic performance of nanozymes by promoting the generation of high-valent metal-oxo (HVMO) species. Download: Download high-res image (179KB) Download: Download full-size image
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Dongze Lai,Mingyu Xie,Huawang Zhao,Xiaomin Wu,Bihong Lv,Guohua Jing
Electrochemical reduction of CO 2 into high-value chemicals, such as formic acid (HCOOH), is an important way to resource CO 2 . Interfacial effects through catalyst design are important to improve the ECO 2 RR performance of Bi-based catalysts. A Bi/ATO heterojunction catalyst was constructed. The current density and FE HCOOH of Bi/ATO were 20 mA cm −2 and 95%, respectively, at a potential of -0.97 V, respectively, compared with the reversible hydrogen electrode (RHE). In-situ cyclic voltammetry curves and Raman spectra showed that electron density change occurred between ATO and Bi during the ECO 2 RR process. This Interfacial electron effects increased the conversion of adsorbed CO 2 molecules to HCOOH by reducing the Interfacial resistance. Interfacial electron transfers also prevented the complete reduction of Bi by transferring electrons to ATO during the ECO 2 RR, which stabilized Bi-O structures. Bi-O improved the selectivity for HCOOH, probably by accelerating the formation of an *OCHO intermediate.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wenfeng Zhuge,Xueying Li,Xiaokun Li,Suxiang Feng
A sensitive electrochemical sensor decorated with multiwalled carbon nanotubes and molybdenum carbide (MWCNTs-MoxCy) was successfully developed in this study for the simultaneous detection of hydroquinone (HQ) and o-hydroxyaniline (OHX). The MWCNTs-MoxCy nanomaterials were synthesized by high temperature calcination under nitrogen protection, and the morphologies and elements were characterized and analyzed using a scanning electron microscope (SEM) and energy dispersive spectrometry (EDS), respectively. The MWCNTs-MoxCy composite was ultrasonically dispersed into a modification liquid to construct the modified the glassy carbon electrode, and cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronocoulometry (CC) were used to study the electrochemical performance. In phosphate buffer solution, the synthetic materials displays good redox peaks for hydroquinone (HQ) and o-hydroxyaniline (OHX). The synthesized composite has a large effective surface area, high electron transfer rate and catalytic activity. Under optimum experimental conditions, the MWCNTs-MoxCy/GCE exhibits linear responses to HQ and OHX in the range of 0.1-900.0 μM and 0.8-20.0 μM, respectively, with a limit of determination (S/N=3) calculated to be 0.075 μM and 0.047 μM, respectively. The method was applied to measure the concentrations of these compounds in real water samples and achieved satisfactory results.
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ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Yuanjia Luo,Leming Ou,Wei Sun,Haisheng Han,Jianhua Chen,Jian Peng
To date, lime-free flotation processes are increasingly advocated due to many problems caused by the traditional process using lime (CaO) as a depressant and xanthate (BX) as a collector. In this work, we developed a combination of pyrogallic acid (PGA) and o-isopropyl ethylthiocarbamate (Z200) as an eco-friendly alternative to the lime-xanthate process for chalcopyrite-molybdenite (ccp-mlb) flotation. Roughing flotation experiments showed that this process yields ccp-mlb concentrate with similar recovery and grade of Cu and Mo as in the traditional lime-xanthate process. However, the huge advantage of the novel process is that it requires ten times lower dosages of sodium sulfide in the subsequent separation of ccp-mlb concentrate. The ab initio calculations explained this trend at the atomistic level, where hydrogen sulfide ions could desorb collector more easily from the Z200@ccp complex compared with BX@ccp. The same method could be applied for environmentally friendly separations of other resources with similar composition.
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Journal of Energy Storage
·
2023
·
IF 9.4
Wei Yang,Zheng Yang,Jing Wang,Wei Lu,Weihua Wang
MXenes materials are novel promising candidates for the next generation energy storage devices. In this work, we designed a facile avenue using biomass derived carbons (PCarbons) and Nb 2 C MXenes as raw materials via sonication treatment to obtain Nb 2 C-PCarbons composites (Nb 2 C-PCarbons CPs). As a result, the prepared Nb 2 C-PCarbons CPs achieved a relative high specific capacitance up to 465.6 F·g −1 in the three-electrode system with 6 M KOH electrolyte. The fabricated symmetric supercapacitors (SSCs) displayed the ultra-high energy density (126.9 Wh·kg −1 ) in ion liquid electrolyte and the long cycling life after 10,000 cycles. Meanwhile, the obtained Nb 2 C-PCarbons CPs were also applied as cathode materials in the aqueous zinc ion batteries (AZIBs), achieving the maximum discharge specific capacity of ca. 239.7 mAh·g −1 with good cycling stability. Thus, our work provides an efficient method to modify the MXenes as bi-functional materials for the potential high-value utilization in SSCs and AZIBs.
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