ENVIRONMENTAL TECHNOLOGY
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2020
·
IF 2.213
Fan Xia,Haifeng Yang,Li Li,Yang Ren,Dezhi Shi,Hongxiang Chai,Hainan Ai,Qiang He,Li Gu
This paper used cetyltrimethylammonium chloride (CTAC) pre-loaded activated carbon (AC) to research nitrate adsorption. Effects of various parameters such as AC types, AC dosage as well as initial pH were studied. The results indicated that the ACs modified by CTAC can get higher nitrate removal. Even pH is neutral and basic, an accepted removal about 2.5 mg/g can be observed. The more CTAC pre-loaded on the AC surface, the higher nitrate adsorption capacity can be obtained. pH is regarded as a key factor affecting interactions between adsorbent and adsorbate, and the results confirmed that the nitrate adsorption on modified AC decreases gradually with the growth of initial pH. Besides, the acidic pH condition is much favoured for adsorption while the results gained a nitrate adsorption about 4.28 mg/g at pH = 3 condition. Sorption mechanism of nitrate on CTAC modified AC was investigated through two kinetic modellings including pseudo-second-order and Weber and Morris intra-particle diffusion model. The results imply that the generalized kinetic models tally well with experimental data. Additionally, interference of co-existing anions is examined, and the results showed that higher co-anions concentration would bring a heavier depression of the nitrate uptake due to its competing for adsorption sites.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2020
·Vol. 101
·期 9
·3605-3612
·
IF 2.614
Lipeng Han,Jiahui Li,Shujie Wang,Weiwei Cheng,Lukai Ma,Guoqin Liu,Dongxue Han,Li Niu
BACKGROUND Glycidyl esters (GEs) have attracted worldwide attention for their potential harm to human health. The GEs in edible oils mainly form during the deodorization of the oil refining processes. We used sesamol and sesamolin to inhibit the formation of GEs in model corn oil (MCO), model palm oil (MPO) and model rice bran oil (MRO) during a deodorization process. RESULTS The results showed that, in the three model oils, the total GE content was in the following order from highest to lowest: MRO (1437.98 μg kg −1 ) > MPO (388.64 μg kg −1 ) > MCO (314.81 μg kg −1 ). The inhibitory effect of the three antioxidants on the formation of GEs in the MCO was in the following order from strongest to weakest: tert-butylhydroquinone (TBHQ) > sesamol > sesamolin. CONCLUSION When the mass percentage of sesamol was 0.05%, its inhibition percentage on GEs was close to the inhibition percentage of 0.02% added TBHQ. The present study provides a foundation for understanding how to inhibit the formation of GEs in oils by adding sesamol during the deodorization process.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jing Pan,Shaobin Li,Fengbo Li,Tingting Yu,Yupeng Liu,Li Zhang,Lin Ma,Ming Sun,Xuefeng Tian
Metal-organic frameworks (MOFs)-based derivatives provide a flexible platform for constructing high performance supercapacitors as electrode materials. Herein, a novel NiFe 2 O 4 /NiCo 2 O 4 /GO composites has been successfully prepared by dual-MOF as precursor. The NiFe 2 O 4 /NiCo 2 O 4 /GO composite formed a special structural morphology providing a large surface area. The composite electrode material exhibited an excellent specific capacity of 661.6 C/g (1470 F/g) at 1 A/g, excellent rate capability (from 1 to 20 A/g the specific capacity decreases about 38 %) and outstanding long cyclic life (89.9 % capacity retention after 3000 cycles). Moreover, an asymmetric supercapacitor was composed of NiFe 2 O 4 /NiCo 2 O 4 /GO and activated carbon as positive electrode and negative electrode, respectively. Meanwhile, ASC exhibited a specific capacity of 373.3 C/g at 1A/g in a potential range from 0 to 1.45 V, it showed the maximum energy density of ASC equal to 109 Wh kg −1 at a power density of 1051.17 W kg −1 . In addition, the NiFe 2 O 4 /NiCo 2 O 4 /GO//AC has an outstanding cycling stability (90.7 % capacitance retention after 1000 cycles), which makes it a potential application for in the field of energy storage-conversion application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Guorong Wang,Zhiliang Jin,Weixin Zhang
Improving conductivity of electron and ion was considered to be the significant tendency on pseudocapacitive materials. In this work, a flower-like P-NiAl LDHs electrode materials have been successfully fabricated by hydrothermal synthesis and subsequent phosphatized treatment. Owing to the presence of phosphide, the resulting P-NiAl LDHs electrode showed a high specific capacitance of 2159F g −1 at 1 A g −1 and a good capacitance retention of 85.6% at 20 A g −1 , which more excellent than NiAl LDHs electrode. Besides, the P-NiAl LDHs//AC asymmetric supercapacitor exhibited a high energy density of 79.3 Wh kg −1 under a power density of 1033.6 W kg −1 and an acceptable stability of 73.6% specific capacitance retention after 2400 charge-discharge cycles. Consequently, the P-NiAl LDHs nanoflower is one of the better candidates for assembling supercapacitor, and this phosphatized method is a kind of facile and desirable strategies to improve the electrochemical characteristics of LDH-based supercapacitor materials .
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ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Qingshan Fu,Lei Zhang,Haifei Zhang,Xuedan Chen,Mingtian Li,Min Gong
Various nanoporous particles, nanofibers have been employed for adsorptive removal of dyes from wastewater. However, these nanomaterials are difficult in separation from solution, generally by centrifugation or filtration. These processes are tedious and will limit the upscale applications. Herein, a hierarchically porous carbon monolith has been fabricated on grounds of ice and metal organic framework (MOF) templating method. The prepared carbonaceous monolith exhibited abundant ice-templated macropores , MOF-templated micropores and mesopores, and a high BET (Brunauer-Emmett-Teller) special surface area (530 m 2 g −1 ). The monolith achieved an MB (methylene blue) adsorption capacity of 95.82 mg g −1 (10 mg adsorbent/5 mL aqueous dye solution) and a theoretic maximum value of 179.86 mg g −1 by the Langmuir model. Compared with MB, the adsorption capacity for MO (methyl orange) was lower. Several adsorption kinetics and isotherms models were used for analysis of adsorptive data, and the results demonstrated the adsorption of MB and MO on the porous carbon monolith is a spontaneous endothermic physisorption process, which was mainly controlled by electrostatic reaction. Importantly, the monolith could be easily picked up using tweezers and used for recycling tests. After four cycles, the 94% of the initial adsorption capacity for MB can be retained.
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JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Zhen Sun,Yanqing Lai,Na Lv,Liangxing Jiang,Ming Jia,Jie Li,Weizhai Bao,Fangyang Liu
Solid-state batteries (SSBs) exhibit a promising prospect due to their potential in terms of safety and energy densities . As an oxide electrolyte, cubic garnet solid electrolyte (cubic-Li 7 La 3 Zr 2 O 12 ) attracts wide attention due to the high ionic conductivity . However, the problem of poor contact between garnet solid electrolyte and lithium impairs the development of solid electrolytes. Herein, we demonstrate an effective modification method to cope with the interface issue between electrolyte and Li metal by introducing an Ag@WSe 2 composite layer. By applying this method, the interfacial resistance between the garnet electrolyte and Li metal is reduced to ~12.5 Ω cm 2 , which is nearly 150 times lower than the value of 1900 Ω cm 2 before modification. The WSe 2 acts as a framework to immobilize Ag, while Ag forms an Ag–Li alloy with lithium for lithium ions transportation. And other Ag@TMDs (transition metal dichalcogenides) composites have also been proven to have similar effects. In addition, the Li | Ag@WSe 2 -LLZO | LFP full cell demonstrates a satisfactory capacity and excellent cycle stability (500 cycles with 90% capacity retention rate) at room temperature .
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Wei Luo,Yi Liu,Fan Li,Jinghao Huo,Dan Zhao,Jianfeng Zhu,Shouwu Guo
The novel V 2 CT x MXenes have gained increasing attention as anode materials in lithium-ion batteries, but to boost their practical to the theoretical values is still challenging. Herein, the partially etched V 2 CT x was oxidized in the presence of H 2 O 2 through a hydrothermal reaction and the electrochemical properties of as-obtained oxidized V 2 CT x were assessed. It is illustrated that the oxidized V 2 CT x possesses a large surface interlayer spacing, and enriched with VO 2 (A) and O-terminate groups. Once used as anode materials for Li-ion batteries, the oxidized V 2 CT x shows enhanced specific lithium ion storage capacities of 318 mAh·g −1 at 100 mA·g −1 after 100 cycles, and 125 mAh·g −1 at 1000 mA·g −1 after 1000 cycles, and better cycling stability and excellent rate performance over the V 2 CT x .
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Guodong Zhang,Mengting Sun,Bingjie Liu,Fei Wang
Despite confined nanospace is known as corresponding to fast hydrate kinetics, hydrate nucleation and growth mechanisms behind the promotion effect have not been thoroughly understood. Here we estimated hydrate nucleation and growth kinetics in confined porespace and proposed a new adsorption-induced two-way nanoconvection mechanism, which may constitute the essence of the confinement effect. Hydrate formation kinetics loaded by activated carbon (AC) suggest a discrete two-stage adsorption that attributes to methane physical adsorption and hydrate formation, respectively, and the promotion of methane physical adsorption on hydrate nucleation in inner pores was first presented. Impressively, the two-way convection at molecular scale gives rise to hydrate fibers, which grow out from inner pores and significantly depend on the contents of pre-adsorbed water, and this finding inversely confirms the nanoconvection mechanism. This work provides a novel perspective on improving the understanding of hydrate nucleation and growth kinetics in confined porespace and sheds light on the application of AC-based methane storage.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Daman Xu,Genhui Teng,Yingqi Heng,Zhizhong Chen,Dongying Hu
The transparent and renewable porous cellulose separators (ACR-3, ACR-5, ACR-7, ACR-9) with different concentration of cellulose solution (3 wt%, 5 wt%, 7 wt%, 9 wt%) were prepared via a phase-inversion process with 1-allyl-3-methylimidazolium chloride (AMIM-Cl) as the solvent. Cellulose separators displayed high thermal stability, strong mechanical properties and excellent apparent properties. ACR-7 separator showed a higher porosity of 74.90% and electrolyte uptake of 323.68% with a smaller pore size and a more uniform pore structure compared with the other cellulose separators. The assembled supercapacitors (electrode/separator/electrode, SCD-7) showed good electrochemical performances in many aspects, including a lower equivalent series resistance of 0.5Ω, a higher charge-discharge efficiency of 98.58% at 3 A/g and areal capacitance of 1.15 F cm −2 at 5 mV/s than the SCD-3, SCD-5, SCD-9 and the assembled SCDs with two commercial separators (TF4040 for SCD-40 and MPF30AC for SCD-30). SCD-7 showed a high retention of 81.99% after 4000 charge-discharge tests at 1 A/g, showing a good charge-discharge cycle stability. Compared with SCD-40 and SCD-30, SCD-7 showed a lower voltage drop below 0.03 V, a higher specific capacitance of 130 F/g, energy density of 25.94 Wh/kg and power density of 0.36 kW/kg at 0.5 A/g. Overall, ACR-7 is expected to be applied as a separator in the field of supercapacitors.
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Materials
·
2020
·Vol. 13
·期 7
·1513
·
IF 3.057
Jialing Kang,Mengjia Wang,Chenbao Lu,Changchun Ke,Pan Liu,Jinhui Zhu,Feng Qiu,Xiaodong Zhuang
Due to the growing demand for energy and imminent environmental issues, hydrogen energy has attracted widespread attention as an alternative to traditional fossil energy. Platinum (Pt) catalytic hydrogen evolution reaction (HER) is a promising technology to produce hydrogen because the consumed electricity can be generated from renewable energy. To overcome the high cost of Pt, one effective strategy is decreasing the Pt nanoparticle (NP) size from submicron to nano-scale or even down to single atom level for efficient interacting water molecules. Herein, atomically dispersed Pt and ultra-fine Pt NPs embedded porous carbons were prepared through the pyrolysis of Pt porphyrin-based conjugated microporous polymer. As-prepared electrocatalyst exhibit high HER activity with overpotential of down to 31 mV at 10 mA cm−2, and mass activity of up to 1.3 A mgPt−1at overpotential of 100 mV, which is double of commercial Pt/C (0.66 A mgPt−1). Such promising performance can be ascribed to the synergistic effect of the atomically dispersed Pt and ultra-fine Pt NPs. This work provides a new strategy to prepare porous carbons with both atomically dispersed metal active sites and corresponding metal NPs for various electrocatalysis, such as oxygen reduction reaction, carbon dioxide reduction, etc.Keywords:platinum;atomically dispersed active site;nanoparticle;porous carbon;hydrogen evolution reaction
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BIOMEDICAL CHROMATOGRAPHY
·
2020
·Vol. 34
·期 7
·e4834
·
IF 1.728
Xiaoyue Shan,Siwei Tan,Yanpeng Shi,Ji Shao,Kewen Su,Ling Zhang,Hui Feng,Haipeng Ye
In this study, activated carbon/diatomite-based magnetic nancomposites (denoted as AC/DBMNs) were synthesized and applied as an adsorbent for magnetic solid-phase extraction of S- phenylmercapturic acid ( S- PMA) from human urine prior to high-performance liquid chromatography. The surface morphologies and structures of AC/DBMNs were characterized by Fourier transform infrared spectroscopy, transmission and scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller surface area, vibrating sample magnetometer and ζ -potential measurements. The experimental parameters including sample volume, sample pH, adsorbent amount, extraction time, elution solvent and desorption time were investigated in detail. Under the optimum conditions, the method exhibited good linearity ( r > 0.9993) within the concentration ranges of 0.03–1.0 mg/L. Moreover, the limits of detection and quantification were 0.01 and 0.03 mg/L, respectively. The enrichment factor was 5, and good recoveries (88.9–97.3%) with relative standard deviations in the range of 5.6–6.8% ( n = 6) for inter-day and 6.3–8.1% ( n = 6) for intra-day were achieved. The developed method was successfully applied to the analysis of S- PMA in urine samples. In addition, this accurate and sensitive method has great potential to be applied in the early screening and clinical diagnosis of the workers exposed to benzene.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Xueying Yang,Cuili Xiang,Yongjin Zou,Jing Liang,Huanzhi Zhang,Erhu Yan,Fen Xu,Xuebu Hu,Qiong Cheng,Lixian Sun
Transition metal oxides are ideal electrode materials used for supercapacitors . However, the synthesis of transition metal oxides suffers from drawbacks such as high reaction temperature and energy consumption. Herein, we report the synthesis of sea urchin-like Co 3 O 4 -NiO composites supported on graphene oxide (GO) using a hydrothermal method followed by calcination with a low temperature (250 °C). The obtained Co 3 O 4 -NiO/GO composite demonstrates a high specific capacitance of 883 F g −1 at 1 A g −1 . Furthermore, upon coupling with an activated carbon (AC) positive electrode, an asymmetric cell of Co 3 O 4 -NiO/GO//AC exhibits outstanding stability reflected by the high capacitance retention of 82% at a high current density of 10 A g −1 . The excellent electrochemical properties of the composite may be attributed to the good synergistic effect of Co 3 O 4 and NiO, as well as the assembly of Co 3 O 4 and NiO into a sea urchin structure, which results in increased electron conductivity and more exposed electroactive sites leading to the promotion of the Faradaic redox process .
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