JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 12
·123502
·
IF 4.386
Qibin Tao,Hao Lan,Lanlan Wei,Lu Chen,Mili Weng,Qizhou Dai
An innovative CMS-PbO2 electrode was fabricated by combining hydrothermally synthesized carbon microspheres (CMS) on a PbO2 electrode by electrodeposition. Using the CMS-PbO2 electrode, the main factors affecting Isopropylantipyrine (PRP) degradation were studied. Under optimum process conditions, the concentration of PRP was 50 mg l−1, the applied current density was 30 mA cm−2, the electrolyte (Na2SO4) concentration was 0.1 mol l−1, and pH was 7. The PRP degradation rate reached 100%, and chemical oxygen demand (COD) removal rate reached 43.42% after 120 min of electrochemical oxidation. Using field-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy, the electrochemical performance of the two electrodes was discussed. The composite of carbon microspheres successfully improved the electrochemical activity of the electrode and its conductivity. Furthermore, the ability of the two electrodes to generate hydroxyl radicals was compared and the possible degradation pathway of PRP was considered. In addition, electrode stability and safety were evaluated by accelerated lifetime experiments and detection of lead ions in solution after electrochemical oxidation. The CMS-electrode was more stable and safer than the PbO2 electrode. The CMS-PbO2 electrode provides a new strategy for the treatment of pharmaceutical wastewater.
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高影响因子
LANGMUIR
·
2023
·
IF 3.9
Lei Tang,Tongchang Wang,Zhixiang Zeng
Materials require specific surface structures to achieve the best performance, but achieving an optimal structural design requires a systematic study of how structure affects performance. In this work, we comprehensively and systematically investigated the structure–activity relationship between the nanowire structure and the oil dewetting self-cleaning performance. It is easy for an oil droplet to enter this structure, but it is difficult for it to escape from the gaps between the structures even under the action of water. So, the oil dewetting ability is greatly reduced, showing that this “easy to enter and difficult to exit” mode is very disadvantageous for oil desorption. Moreover, if the structure is dissolved during the test, the oil dewetting ability will be restored. The desorption effect is affected by structural parameters and reaction conditions, which further verifies the negative effect of this structure. In contrast, copper(II) oxide nanowires completely lose their self-cleaning ability due to the enhancement of hydrophobicity and oleophilicity, and the larger-diameter copper(II) oxalate nanorods exhibit a “difficult to enter and difficult to exit” mode, leading to the partial recovery of the oil dewetting performance. This study helps us deeply understand the influence of the surface microstructure on the oil dewetting performance and lay a solid foundation for further appropriate structural design.
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高影响因子
FUEL
·
2023
·
IF 7.4
Gui-Hua Wei,Ting Lu,Hai-Yan Liu,Jiao-Xuan Bai,Qian Wang,Guang-Yue Li,Ying-Hua Liang
Catalytic oxidation of cellulose using O 2 in aqueous solution shows important potential in the production of formic acid, an important industrial chemical as well as a promising hydrogen storage material. However, the microscopic oxidation mechanism is unclear due to the challenges in observing the cleavage of chemical bonds and the formation of transient intermediates and radicals. In this work, a combination of experimental and theoretical methods has been used to explore the catalytic oxidation mechanism of cellulose to formic acid. In the oxidation of cellulose, hydrogen cation plays a catalytic role and a decrease in pH improves the transformation with 57.7% formic acid obtained. Based on the model compound experiments, intermediate detection, molecular dynamics simulation, and density functional theory calculation, a mechanism is proposed, in which polyhydroxy aldehydes generated by cellulose hydrolysis undergo a continuous carbon–carbon bond cleavage-oxidation reaction to form formic acid with aldehyde moiety as the direct precursor. Acid has a catalytic effect on the cleavage-oxidation reaction of carbon–carbon bonds, reducing the energy barrier of carbon–carbon bond cleavage through generating epoxy intermediates. The aldehyde moieties are kept at an appreciable concentration, thereby increasing the yield of formic acid. Moreover, it is confirmed that the carboxyl moiety obtained by the oxidation of aldehyde is the precursor of the by-product CO 2 . These findings provide an in-depth insight into the production of bio-chemicals through carbon–carbon bond cleavage and a theoretical support for further process optimization.
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Foods
·
2023
·Vol. 12
·期 2
·374
·
IF 5.2
Shengyue Zhong,Bin Huang,Teng Wei,Zeyuan Deng,Jing Li,Qiang Wen
Red-flowered oil-tea camellia (ROC) is an important woody oil species growing in the south, and its oil has high nutritional value. There are four main species ofROCin China, namely,Camellia chekiangoleosa(CCH),Camellia polyodonta(CPO),Camellia semiserrata(CSE) andCamellia reticulata(CRE). Reports on the comprehensive comparative analysis ofROCare limited. This study investigated the fruit characteristics and nutritional components of fourROCfruits, and the results showed thatROChad high oil content with levels of 39.13%–58.84%, especially theCCHfruit, which reached 53.6–58.84%. The contents of lipid concomitants ofROCoil were also substantial, including β-amyrin (0.87 mg/g–1.41 mg/g), squalene (0.43 mg/g–0.69 mg/g), β-sitosterin (0.47 mg/g–0.63 mg/g) and α-tocopherol (177.52 μg/g–352.27 μg/g). Moreover, the transverse diameter(TD)/longitudinal diameter (LD) of fruits showed a significant positive correlation with the oil content, andROCfruits with thinner peels seemed to have better oil quality, which is similar to the result of the oil quality evaluation obtained by the gray correlation coefficient evaluation method. FourROCoils were evaluated using the gray correlation coefficient method based on 11 indicators related to the nutritional value ofROC.CCHoil had the highest score of 0.8365, and YS-2 (a clone ofCCH) was further evaluated as the bestCCHoil. Finally, the results of heatmap analysis showed that triglycerides could be used as a characteristic substance to distinguishCCHoil from the other threeROCoils. The PLSDA (Partial least squares regression analysis) model and VIP (Variable important in projection) values further showed that P/S/O, P/O/O, P/L/L, P/L/Ln, S/S/O, S/O/O and P/S/S (these all represent abbreviations for fatty acids) could be used as characteristic differential triglycerides among the fourROCoils. This study provides a convenient way for planters to assess the nutritional quality of seed oil depending on fruit morphology and a potential way to distinguish between variousROCoils.Keywords:red-flowered oil-tea camellia;Camellia chekiangoleosaoil;correlation analysis;gray correlation coefficient;triglycerides
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高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Wanlei Geng,Debin Wang,Yinfeng Liu,Jialing Zhang,Limei Zhong,Runxiong Lin,Li Ding,Lianying Wu,Dianquan Dong
Developing a stable and efficient adsorbent to recover Cs + from liquid resources or to remove radioactive Cs + from wastewater is challenging. In this study, the precursor Cs 2 Ti 6 O 13 (CTO) was synthesized by the solvothermal and solid-phase sintering methods for the first time, then it was acid-modified to synthesize a novel H-type titanium-based material (H-CTO nanosheets). A series of batch adsorption experiments was carried out. The adsorption of Cs + on H-CTO was evaluated under different experimental conditions, including contact time, temperature, initial Cs + concentration, pH, and interfering ions. Experiments show that H-CTO exhibits a larger adsorption capacity (329 mg/g) and better cycle performance than the currently reported titanium-based adsorbents. The cesium ions were easily eluted by the 0.2 M HCl solution; the adsorption capacity did not decrease significantly after five cycles. Furthermore, the adsorption behavior of Cs + on H-CTO can be described by the Langmuir isotherm and pseudo-second-order kinetic models. Characterization using IR and Raman spectroscopic analyses indicates that the adsorption mechanism of Cs + on H-CTO involves O H bond cleavage and O Cs bond formation. Thermodynamic studies showed that low temperatures are favorable for Cs + adsorption and are spontaneous. Overall, the results suggest that H-CTO nanosheets are promising for the recovery or removal of Cs + ions from Cs-containing liquid ores or radioactive wastewater .
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Qi Chen,Ying Li,Kangling Yan,Guanghui Li,Donghui Luo,Weidong Bai,Xiaofang Zeng,Qingping Wu,Jinhua Deng,Hao Dong
Chaozhou pickle, a traditional Chinese fermented vegetable product, is highly regarded among consumers due to its unique flavor. This work monitored the flavor substances and microbial communities of Chaozhou pickles during fermentation by gas chromatography-ion mobility spectrometry (GC-IMS) and high-throughput sequencing. A total of 70 volatile compounds were identified from Chaozhou pickles. In addition to fruit aroma esters, the pickles also contain aldehydes, ketones, alcohols, acids, and heterocyclic compounds. The four pickles exhibited a prevalence of Cyanobacteria, Proteobacteria, and Firmicutes as the leading bacterial phyla , while Weissella, Leuconostoc, and Lactobacillus were identified as the predominant bacterial genera. Physiochemical quality and acid properties of Chaozhou pickle were also investigated. Results revealed a significant reduction in hardness, chewiness and pH during fermentation, as well as a notable increase in free amino acids, and organic acid levels. These results could contribute to a greater comprehension of the role of microorganisms in flavor formation during fermentation and provide a scientific foundation for the industrialization of Chaozhou pickle.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Debin Zeng,Longtao Wang,Ruian Du,Zhen Wu,Xiting Wang,Chunguang Kuai,Yuzheng Guo,Changlin Yu
CO 2 photoreduction under mild conditions remains challenging, attributing to sluggish kinetics of complex coupling process of multi-electrons-protons and inefficient electron-hole pairs utilization. Herein, with Zn 3 V 2 O 8 as a phase transformation material, we construct an effective Zn 2 V 2 O 7 /Zn 3 V 2 O 8 /ZnO (OVZn) Z-scheme system by partial decomposition of Zn 3 V 2 O 8 into Zn 2 V 2 O 7 and ZnO. Time-resolved fluorescence decay (TRFD) spectra investigation shows that the photogenerated electrons of Zn 2 V 2 O 7 and ZnO recombine with the holes of Zn 3 V 2 O 8 , retaining more reductive electron of Zn 3 V 2 O 8 for CO 2 reduction. Moreover, in-situ Fourier-transform infrared spectroscopy suggests that the heterostructure can lower the energy barrier of CO desorption by changing bridge-bonded CO to linear-bonded CO and optimizing the energy barrier of CO production. Moreover, Cu, Ag and Au loading on OVZn greatly enhance light harvesting and promote photoelectric conversion, producing much photogenerated electron-hole pairs for CO 2 reduction. OVZn and metal loaded OVZn have better photocatalytic performance, showing application superiority on CO 2 photoreduction.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Wenqi Nie,Pengfei Sun,Shuai Xu,Jiangdong Sun,Shuang Sun,Yanyan Sun,Lianmei Liu,Zhenzhen Xu,Hao Jia
Ammonium vanadate (NH 4 V 4 O 10 ) is a prominent cathode material for zinc ion storage owing to the abundant active sites, tunable layered structure, and the multivalence state of vanadium ions . Despite the great potential of NH 4 V 4 O 10 , it is constrained by its weak fastness and homogeneity with substrates. A key issue with poor energy storage of flexible battery is extremely low active material load quality. Additionally, the severe self-aggregation phenomena and the brittle interlayer structures are the cause of the rapid capacity fading and the poor rate capacities. Herein, a novel flexible self-support carbon cloth (CC)-based NH 4 V 4 O 10 (CC@NH 4 V 4 O 10 ) cathode was rationally fabricated via a simple hydrothermal method . Apart from serving as a flexible interconnected conductive network, CC can provide uniform nucleation centers and induces ordered growth of NH 4 V 4 O 10 , which effectively reduces its agglomeration problem. The synthesized NH 4 V 4 O 10 nanoribbons exhibit a unique micropore structure with enlarged interlayer spacing, which ensures rapid co-transfer of H + /Zn 2+ ions with enhanced storage capacity. The CC@NH 4 V 4 O 10 cathode delivers a stable specific capacity of 330 mAh g −1 at 0.25 A g −1 with almost no capacity fading (99% capacity retention) over 600 cycles at 5 A g −1 . More impressively, the as-prepared package battery offers outstanding operation stability to power electronics under the low temperature, and it is able to maintain 76% energy retention after 100 cycles at 0 ℃ at a 0.5 A g −1 current density. This high-performance flexible battery may open a new prospect in wearable energy storage applications.
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Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 6
·1845-1856
·
IF 2.3
Zhang Liying,Gan Guoyou,Fan Peiyuan,Liu Yunchuan,Wang Tianwei,Li Weichao,Du Jinghong
Amine ligand, as one of the essential components of the Ag–amine complex, is necessary to reduce the sintering temperature and time of conductive inks. Herein, we report the facile preparation of hybrid amine conductive silver ink, mainly composed of silver oxalate–hybrid amine complex and methanol–acetone solvent. The synergistic effect of long-chain and short-chain amines enhances the uniformity of silver nanoparticles in the silver film. A uniformly conductive silver film is obtained by spin-coating as-prepared ink on the polyimide film, followed by thermal sintering. Then, the influence of butylamine content and sintering parameters on the physical properties and microstructure of silver film is systematically investigated. The resistivity of silver films, sintered at 170 °C for only 20 min, is found to be 6.71 μΩ·cm, which is four times higher than bulk silver. In addition, silver films after bending and adhesion test exhibit low resistivity and excellent adhesion. These results indicate that the hybrid amine conductive silver ink can provide promising opportunities for fabricating highly conductive flexible printed electronics at low temperatures in short times.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hongjin Wang,Shuangqing Zhou,Tao Wang,Zhiye Zhou,Yanggen Huang,Stephan Handschuh-Wang,Hongyu Li,Ying Zhao,Yongbing Tang
Long-term exposition of electrodes to aqueous media inevitably results in biofouling and adhesion of bacteria, reducing the electrolysis efficiency of electrodes for water treatment. To ensure technically efficient antifouling of materials for durable electrodes, hierarchical micro-/nano structured boron-doped diamond (BDD) electrodes were designed and synthesized. Multi-level structured BDD was coated on titanium mesh by a bottom-up strategy, based on a combination of self-assembly seeding and hot filament chemical vapor deposition (HFCVD) growth. The morphology of the BDD coating can be controlled by manipulating the seeding density and boron doping concentration. The designed micro/nano hierarchical structure of the BDD electrode suppressed bacterial adhesion greatly and exhibited excellent anti-biofouling efficiency with an antibacterial rate of ∼ 93 %, which entails simplified self-cleaning and durable BDD-coated electrodes. The BDD-coated electrodes were employed to electrochemically treat Escherichia coli -contaminated water, killing virtually all bacteria (≥99.9 %) in 1 min. Finally, real river water was electrochemically treated, reducing the chemical oxygen demand (COD) down to 5 mg/L in 4 h. The excellent performance shows the great potential of the structured BDD electrodes for long-term water purification .
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Tianyuan Xu,Ting Chen,Zhenhua Chen,Yijun Cao,Yaowen Xing,Xiahui Gui
A photochemical system combining iron (hydr)oxides and oxalate (Ox) shows application prospects in wastewater treatment due to the abundance of reactive oxygen species (ROS) generation. Nevertheless, it is a challenge to the investigate photochemical activity of iron (hydr)oxides/Ox systems with varying structural properties. Herein, the photochemical behaviors of Ox on goethite (Gt) surface from the view of structural dependent activity, containment degradation, and ROS generation were explored in detail. Results confirmed that bidentate mononuclear was formed on Gt surface after complexing Ox. Combined with density functional theory calculation and pH time evolution during aniline degradation, the photochemical activity of the Gt/Ox system fell in between that of ferrihydrite/Ox and hematite/Ox systems. After irradiating 120 min visible light, 96.5% aniline was degraded by 1.0 mM Ox and 0.2 g/L Gt. The amount of •OH in vis/Gt/Ox system could be up to 309.3 μM and its generation was closely associated with Fe(II) while slightly affected by the generated H 2 O 2 . Moreover, as revealed by high-performance liquid chromatography with mass spectrometric and Ecological Structure Activity Relationships software, the toxicity of the intermediates of aniline degradation in the vis/Gt/Ox system towards fish and green algae increased first but then declined accompanied by the generation of non-toxic ring-opening products at the end of reaction. According to the findings in the presented study, it could be concluded that vis/Gt/Ox is a promising approach to wiping out aniline wastewater.
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高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Jueqin Chen,Cao Yang,Tian Wu,Jian Wang,Lihui Yang,Wei Sun,Wei Li,Anqi Wang,Sihao Lv
At present, considerable efforts have been devoted to the development and application of MOFs, and some MOFs have realized industrial mass production and sales. However, little attention was paid to the treatment and disposal of the resulting waste MOF . In this study, the antibiotic(N source)-saturated waste MOF adsorbent was recycled into metal-free N-doped carbocatalyst through one-step pyrolysis . Compared with the pristine MOF-derived undoped carbon, N-doping led to nearly 2-fold enhancement in the pseudo-first-order rate constant for catalytic ozonation of oxalic acid (OA), and the COD removal of coking and swine wastewaters reached more than 60 % within 30 min. Apart from the formation of spongy porous morphology and the boosting of specific surface area from 253.7 to 320.6 m 2 /g after N doping, the characterization analysis and OA degradation results revealed that oxygen vacancies, hydroxyl groups and N species were the main active sites. Furthermore, it was identified the dominant contribution of OH in OA destruction, followed by O 2 — and 1 O 2 , and the metal-free N-doped carbon displayed good reusability and chemical stability. This study proposes a feasible strategy for the utilization of waste MOF, showing great reference significance for the expansion of material functions.
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