Foods
·
2022
·Vol. 11
·期 24
·4112
·
IF 5.561
Junzhu Li,Jiayu Zhang,Chen Li,Wenjing Huang,Cheng Guo,Weiping Jin,Wangyang Shen
Pulsed electric field (PEF) is an effective way to modulate the structure and activity of enzymes; however, the dynamic changes in enzyme structure during this process, especially the intermediate state, remain unclear. In this study, the molten globule (MG) state of α-amylase under PEF processing was investigated using intrinsic fluorescence, surface hydrophobicity, circular dichroism, etc. Meanwhile, the influence of coexisting carrageenan on the structural transition of α-amylase during PEF processing was evaluated. When the electric field strength was 20 kV/cm, α-amylase showed the unique characteristics of an MG state, which retained the secondary structure, changed the tertiary structure, and increased surface hydrophobicity (from 240 to 640). The addition of carrageenan effectively protected the enzyme activity of α-amylase during PEF treatment. When the mixed ratio of α-amylase to carrageenan was 10:1, they formed electrostatic complexes with a size of ~20 nm, and carrageenan inhibited the increase in surface hydrophobicity (<600) and aggregation (<40 nm) of α-amylase after five cycles of PEF treatment. This work clarifies the influence of co-existing polysaccharides on the intermediate state of proteins during PEF treatment and provides a strategy to modulate protein structure by adding polysaccharides during food processing.Keywords:molten globule;protein;pulsed electric field;λ-carrageenan;assembly behavior
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2022
·
IF 11.958
Gaoyin Zhang,Dan Long,Weining Xu,Xiaowei Cheng,Sheng Huang,Chunmei Zhang,Ming Zhou,Kaiyuan Mei,Liwei Zhang
High-ferrite oil-cement (HFOC) has attracted extensive research interest owing to its excellent mechanical properties and corrosion resistance . However, it is difficult to distinguish ferrite and its hydration products in cement paste . Therefore, establishing the mechanism of improvement of the mechanical properties of Portland cement upon the addition of ferrite is challenging. In this study, spherical ferrite (SF) was prepared via jet granulation to explore the mechanism of hydration and improvement of mechanical properties of oil-well cement pastes upon the addition of ferrites. XRD results showed that the crystal structure of the SF is consistent with that of ferrite. Phase analysis of the hydration products revealed that the hydration products in the AFm phase gradually covered the SF particles entirely during the early hydration reaction and transformed into cubic crystals C 3 (A, F)H 6 during the subsequent hydration reaction. The assessment of mechanical properties demonstrated that the compressive and tensile strengths of the oil-well cement paste increased by 11.7 % and 17.5 %, respectively, upon the addition of 4 % SF. Moreover, the addition of SF reduced the elastic modulus of the cement paste. The mechanical properties enhancement mechanism of SF in oil well cement involves participating in the hydration process of oil-well cement and consuming fracture energy . This study provides theoretical support for the development mechanism of mechanical properties of oil-well cement.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Demin Jiang,Yuhan Yang,Chentao Huang,Meiying Huang,Jianjun Chen,Tongde Rao,Xiaoyan Ran
To remove toxic Ni(II) ions from wastewater, a novel flower globular magnesium hydroxide (FGMH) was prepared by a gentle method using trisodium citrate as a crystal modifier. This material exhibited a high specific surface area. The synthesized products and adsorption mechanism for Ni(II) ions were examined by diverse characterization technologies and methods. FGMH was employed to remove Ni(II) ions by the adsorption method. The effects of various parameters, viz., the amount of adsorbent, contact time, temperature and pH, on the removal rate by the adsorbent were investigated in detail. The kinetic data fitted well with a pseudo-second-order model and experimental equilibrium adsorption data conformed to a Langmuir isotherm under optimized conditions. The optimal process parameters included 30 mg of FGMH, a 50 min contact time, pH values between 6.07 and 7.71 for the Ni(II) solution, and adsorption at room temperature for 50 mL of 80 mg/L Ni(II) solution. The percentage of removal efficiency was found to be above 92.64%, and the maximum adsorption capacity of MH was 287.11 mg/g under optimum adsorption conditions. The analyses indicated that the Ni(II) ions were chemisorbed on the FGMH surface.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Ting Li,Xianfa Zhang,Xiaoli Cheng,Yingming Xu,Shan Gao,Lihua Huo
It is necessary to achieve highly sensitive and low temperature detection of Cl 2 for the protection of the environment and human life and health. How to achieve sensitive detection of Cl 2 at low temperature remains a challenge. The construction of heterojunction is beneficial for promoting carrier transfer, increasing active sites, thus effectively improving sensing performance of materials. In this study, the flower sphere-like Cu 2 O/CuO composite with p-p heterojunction was obtained by using Cu-CPs as precursor followed with sintering treatment. The Cu 2 O/CuO sensor exhibits high response (S=405) to 10 ppm Cl 2 at low temperature (50 °C), the response/recovery time is 50 s/2420 s. At the same time, the Cu 2 O/CuO sensor has a low detection limit (50 ppb) and good long-term stability (60 days). The characterization results, e.g. electron paramagnetic resonance (EPR), O 2 /Cl 2 -temperature programmed desorption ( O 2 /Cl 2 -TPD), X-ray photoelectron spectroscopy (XPS) etc., reveal that oxygen vacancy effectively promotes the increase of surface adsorbed oxygen, the formation of p-p heterojunction not only modulates the electronic properties of Cu 2 O/CuO but also provides abundant adsorption sites for gas. The synergistic effect of the above factors makes Cu 2 O/CuO composite exhibit satisfactory Cl 2 sensing performance.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Ying Li,Jiahao Lai,Xiaoni Zheng,Siying Lv,Jing Yang,Shihai Cui
Novel material wool ball-like F-doped BiOCl 0.4 Br 0.3 I 0.3 has been successfully fabricated via a facile solvothermal method. In this work, the as-synthesized catalyst was characterized to examine the structure, morphology, optical and electrochemical properties. The catalyst was used in sulfamethazine degradation under visible-light irradiation. The optimized photocatalyst F-BiOCl 0.4 Br 0.3 I 0.3 (Bi:F = 3:2) exhibits superior activity and the degradation efficiency can reach 99.6 % in pH 6 within 60 min. There are two reasons to explain it: (i) The F-BiOCl 0.4 Br 0.3 I 0.3 has narrow band gap; (ii) Wool ball-like morphology can cause multiple reflections of the irradiated light, and availably prolong the action time. The primary oxidative species are holes and superoxide radicals. The possible degradation mechanism was discussed based on the experimental results.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 17
·2815-2824
·
IF 2.909
Zhang He,Zhu Fang,Yu Fenting,Komarneni Sridhar,Ma Jianfeng
In this work, a multi-hollow spherical CeO 2 material was prepared, which when combined with persulfate (PS) efficiently catalyzed the degradation of basic orange II (BOII) under visible light. In the CeO 2 /PS/Vis system, the degradation rate reached 99.70% within 15 min, which suggested very strong photocatalytic activity. The effects of pH and dissolved oxygen were evaluated to provide a basis for subsequent verification of free radicals. Superoxide radicals (O 2 · − ), hydroxyl radicals ( · OH), and oxidative sulfate radicals (SO 4 · − ) generated in the process are conducive to efficient degradation. Afore mentioned radicals were proved by radical scavenging experiments with detection by electron spin-resonance spectroscopy, and the possible degradation pathways are proposed. In addition, after three consecutive degradation cycles, the degradation efficiency of the material was not less than 99%, which proved that the prepared multi-hollow spherical cerium oxide had high stability and recoverability. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 22
·20315-20324
·
IF 2.22
Tan Yang,Zhang Zheng,Guo Fuqiang,Guo Renqing,Bai Haineng,Zhang Baohua,Li Xin,Yang Qian,Liu Xuebo
In this study, multi-shaped CdS was synthesized by hydro- and solvothermal methods. Interestingly, the results of scanning electron microscopy and transmission electron microscopy showed that branch-like CdS could be transformed into ball-like and flake-like in deionized water by ethylenediaminetetraacetic acid and l -cysteine, respectively, and the growth mechanism of CdS was discussed and explored: the ion-binding rate might be the main factor for the morphology transformation of CdS. X-ray diffraction and energy dispersive spectroscopy revealed branch-like CdS which exhibited the hexagonal phase. Besides, the optical characteristics of CdS were performed by ultraviolet–visible and photoluminescence spectrum. Also, CdS was utilized to explore the photocatalytic activity of rhodamine B, and the result showed that the photocatalytic activity of ball-like CdS was higher than flake-like and branch-like CdS.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 35
·e52822
·
IF 3.057
Hejia Chang,Qinghu Meng,Defa Liu,Yue Wu,Zhizhou Yang,Bin Sun,Fang Liu,Yu Liu
Synthesis of hollow spherical polyaniline (HSPANI) with the merits of facile strategy, low cost, low safety risk and high adsorption capacity of Cr(VI) is always a big challenge. In this manuscript, we proposed a facile way to preparation of HSPANI by using the poly(styrene-co-acrylic acid) sphere as template. The results indicated that HSPANI was emeraldine comprised of lots of basically uniform hollow spheres, and its average pore diameter was about 300 nm. HSPANI displayed high adsorption capacity of Cr(VI), and its value arrived at 601.3, 347.8, 235 mg g −1 at pH = 1, 2, and 3, respectively, which were high than many other adsorbents. The endothermic, spontaneous and chemical adsorption process was responsible for this adsorption. The Cr(VI) adsorption capacity was significant relied on its pH, contact time, Cr(VI) concentration and adsorption temperature. The adsorption behavior was well agreed with pseudo second-order equation and Redlich–Peterson isotherm models. HSPANI exhibited remarkable selectivity for adsorption of Cr(VI) even if the K + , Cu 2+ , NO 3 − and SO 4 2− were coexisted. HSPANI also displayed excellent regeneration performance. Therefore, this work not only provided a facile way to synthesis of hollow spherical polyaniline, but also supplied a potential adsorbent for adsorption of Cr(VI) from the industrial wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shuangyue Hou,Yue Lian,Zongying Xu,Dawei Wang,Chaolei Ban,Jing Zhao,Huaihao Zhang
the ball-flower like composite (NiS 2 @MoS 2 ) was successfully synthesized by a convenient two-step hydrothermal method using Ni(NO 3 ) 2 ·6H 2 O and (NH 4 ) 6 Mo 7 O 24 ·4H 2 O as precursors. MoS 2 nano-sheets, uniformly generated on NiS 2 surface, increases the surface roughness and porosity, and accelerates the electrons and ions transfer of the composite. The synergistic effect of Mo and Ni improves the conductivity of the materials. Furthermore, by controlling the atomic ratio of Mo to Ni in precursors, the composite MN-1 (the molar ratio of MoS 2 to NiS 2 is 1:1) with the best capacity performance was obtained. The morphology and composition were characterized by a variety of means, such as TEM, SEM, XPS, XRD, BET and EDX. The electrochemical measurement results exhibited high specific capacity (848.2 C g −1 at specific current of 1 A g −1 ) and good cycling stability (83.1% specific capacity retention after 10000 GCD cycles) of MN-1 in 6 M KOH. Furthermore, an asymmetric supercapacitor was assembled with MN-1 as positive electrode and activated carbon as negative electrode. When the power density is 0.8 kW kg −1 , its energy density reaches up to 37.2 Wh kg −1 . The present work may offer new design strategy for electrode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2017
·Vol. 9
·期 21
·4035-4042
·
IF 4.803
Ting Song,Piyong Zhang,Jian Zeng,Tingting Wang,Atif Ali,Heping Zeng
Graphical Unique morphological structure : Three carbon nitrides with different morphologies are shown to be highly effective visible-light photocatalysts for the photocatalytic H 2 evolution reaction (HER). Globe/tree-like g-C 3 N 4 shows high visible-light photocatalytic HER activity, apparent quantum efficiency, and stability. The enhanced photocatalytic activity might arise from the globe-like carbon nitride as a self-cocatalyst and hollow-tree-branch structures. Photogenerated carriers possess high recombination efficiency in carbon–nitrogen materials, which results in lower photocatalytic H 2 evolution activity. By reviewing the literature, it was concluded that relying only on a structure-controlled technique was insufficient to reduce the combination of photogenerated carriers without introducing a foreign material or element. Hence, bulk-like g-C 3 N 4 [CN (B)], globe/strip-like g-C 3 N 4 [CN (G/S)], and globe/tree-like g-C 3 N 4 [CN (G/T)] were in situ obtained through a facile calcination method. Similar to platinum (Pt) as a cocatalyst, globe-like carbon nitride as a self-cocatalyst was found to improve the separation efficiency of photogenerated carriers effectively. Interestingly, the hollow-tree-branch morphology of CN (G/T) effectively transmitted photogenerated holes, which thereby enhanced the photocatalytic H 2 evolution activity. The H 2 production rates of CN (G/S) and CN (G/T) were almost 10.7 and 18.3 times greater, respectively, than that of CN (B) without the addition of Pt as a cocatalyst. Notably, CN (G/S) and CN (G/T) displayed considerable rates of H 2 production in water relative to that shown by CN (B) (no activity) without the use of any sacrificial agent and by using Pt as a cocatalyst. CN (G/T) showed outstanding long-term stability, as evidenced by seven cycle tests performed over 28 h. The charge separation and transfer process of the compounds were verified by photoluminescence (PL), time-resolved PL spectroscopy, and photocurrent measurements.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Feng Ye,Si Chen,GuoDong Tang,Xu Wang
A two-component gelator (B1⋯C12⋯B1) based on interaction between dendritic branch (Branch1 (COOH)) and diaminododecane is designed and synthesized, and its self-assembly behavior in methyl methacrylate (MMA) is firstly investigated. It is interesting to find that the gel formation depends on the concentration and sonication during cooling of the B1⋯C12⋯B1/MMA solution. Sonication plays as a switch simulator for exchanging morphology between a 3D gel network and globular structure in a certain concentration range. Thermal stability, rheological properties, morphology and self-assembly mechanism of the gels were investigated with tube inversion methodology, Dynamic oscillatory measurement, SEM and FTIR, respectively. The results indicated that Sonication-induced-gel (S-gel) exhibits much higher gel–sol temperature, storage modulus and lower critical gelator concentration compared with Temperature-induced-gel (T-gel), while sonication could partially destroy the hydrogen bond network and benefit the formation of the organogels.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 11
·1-10
·
IF 2.127
Duan Wanyi,Li Aoqi,Chen Yujuan,Zhuo Kelei,Liu Jianming,Wang Jianji
In this work, a facile one-pot solvothermal method is developed for fabricating hollow spherical PtCu alloy nanoparticles (with the size of 124 ± 16 nm) supported on reduced graphene oxide (PtCu/rGO), with the assistance of 1-decyl-3-methylimidazolium bromide ([C 10 MIm]Br) as the structure-directing agent and capping agent. The influence of various experimental parameters on the morphology and structure of prepared PtCu/rGO hybrids is researched. Compared with the commercial Pt/C (10 wt%) and Pt/rGO, the as-prepared PtCu/rGO hybrid exhibits a larger electrochemical active surface area, higher electrocatalytic activity, and better tolerance for methanol oxidation in acidic media. We believe that the hollow spherical PtCu alloy supported on rGO will have great potential applications for direct methanol fuel cells.
Hollow spherical PtCu alloy supported on rGO hybrid is successfully synthesized by a facile one-pot solvothermal method with the assistance of 1-decyl-3-methylimidazolium bromide. 1-Decyl-3-methylimidazolium bromide acts as both shape-controlled agent and capping agent for synthesizing PtCu/rGO. The as-prepared PtCu/rGO exhibits high electrocatalytic activity and good poisoning-resistant ability for methanol oxidation in acidic media.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）