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    30 September 2020, Volume 54 Issue 5 Previous Issue    Next Issue
    Research Report
    Antibacterial Activity of Dehydroabietyl Nitrogen Derivatives
    Zhaolan ZHAI,Pu LYU,Ping ZHAO,Zhanqian SONG,Shibin SHANG,Xiaoping RAO
    2020, 54 (5):  1-7.  doi: 10.3969/j.issn.1673-5854.2020.05.001
    Abstract ( 298 )   HTML ( 16332899 )   PDF (648KB) ( 399 )   Save

    The antibacterial activities of dehydroabietic acid(1), dehydroabietylamine(2), dehydroabietamide derivatives(3a-3m), dehydroabietylamine benzaldehyde Schiff base derivatives (4a-4i), against six different pathogenic fungi were studied by using plate counting method. The results showed the antibacterial activity of dehydroabietylamine was better than that of dehydroabietic acid, and the antibacterial activities of dehydroabietylamine benzaldehyde Schiff base derivatives were better than that of dehydroabietamide. And the dehydroabietylamine p-chlorosalicylaldehyde Schiff base(4d), dehydroabietylamine m-fluorobenzaldehyde Schiff base(4f), dehydroabietylamine p-fluorobenzaldehyde Schiff base(4g) and dehydroabietylamine p-chlorobenzaldehyde Schiff base(4h) showed strong antibacterial activities. The inhibitory rates of sample 4h against Botrytis cinerea, Fusarium solani and Alternaria brassicae at 180 mg/L were up to 100%, which were close to the positive control, Actinomycin. The antibacterial activities of samples 4d, 4f, 4g and 4h at mass concentrations of 11.25, 22.5, 45 and 90 mg/L against six different pathogenic fungi were further studied. All the samples showed excellent antibacterial activities against Botrytis cinerea and Alternaria brassicae at different mass concentrations. The inhibitory rates of sample 4f at 22.5 mg/L against six different pathogenic fungi were more than 95%, but the sample 4g at 22.5 mg/L showed the lowest inhibitory rate. And the sample 4h at 45 mg/L showed the highest antibacterial activities. The above results demonstrated that the substitution position and the type of the halogen atom on the benzene ring affected the antibacterial activity at different mass concentrations and the concentration of the optimum antibacterial activity.

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    Effect of Jet Plasma Discharge in Different Atmosphere on Surface Properties of Wood-plastic Composites
    Chunpo YUE,Zhiling YU,Qianhui YU,Tao WANG,Pengbo WANG,Mingwei DI
    2020, 54 (5):  8-14.  doi: 10.3969/j.issn.1673-5854.2020.05.002
    Abstract ( 184 )   HTML ( 411 )   PDF (8317KB) ( 237 )   Save

    The surface treatment of polyethylene wood-plastic composite(PE-WPC) was carried out to improve the adhesion properties by jet plasma discharge in three different atmospheres of air, nitrogen and oxygen, respectively. Among them, the samples treated with air, nitrogen and oxygen atmosphere were labelled as PE-WPC-A, PE-WPC-N and PE-WPC-O, respectively. The effect of different atmosphere jet plasma treatment on the surface properties of PE-WPC was studied by using shear strength test, contact angle test, surface morphology observation, Fourier transform infrared spectroscopy(FT-IR) analysis and X-ray photoelectron spectroscopy(XPS) analysis. The results showed that the bonding shear strength of PE-WPC was improved obviously after the surface treatment of jet plasma discharge due to the change on the surface properties for the PE-WPC, which was in creased from 0.62 MPa to 11.32-13.79 MPa. For the bonding strength, there was slight difference between the jet plasma discharges in different atmospheres, and for the surface microstructure of the treated PE-WPC, there was evident difference between the jet plasma discharges in different atmospheres. The plasma discharge in pure nitrogen atmosphere was mainly surface chemical modification, which introduced more nitrogen-containing groups on the surface of PE-WPC. Surface oxidation etching was dominant in oxygen atmosphere jet plasma treatment, which introduced more oxygen-containing groups on the surface of PE-WPC. The jet plasma discharge in air atmosphere was combined with the above two effects.

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    Effect of Pyrolysis Temperature and Biomass Type on Adsorption of U(Ⅵ) by Biochar
    Peng LYU,Guanghui WANG,Bing WANG,Deyu HU
    2020, 54 (5):  15-24.  doi: 10.3969/j.issn.1673-5854.2020.05.003
    Abstract ( 308 )   HTML ( 1840393 )   PDF (2392KB) ( 406 )   Save

    Biochar(BC) was made by pyrolysis of rice husk, bamboo and Chinese fir sawdust at different temperature, which respectively labeled DBC, ZBC and MBC in turn. The physicochemical properties of the product were characterized by Fourier transform infrared spectroscopy(FT-IR), scanning electron microscope(SEM), energy dispersive X-ray(EDS) and X-ray diffraction(XRD). The adsorption characteristic and mechanism of BC to U(Ⅵ) were studied by batch adsorption experiments. The results showed that, as the temperature increased from 300 ℃ to 700 ℃, the pH value and ash content of the three kinds of biochars increased, but the yield decreased. Meanwhile, the characterization of both ZBC and DBC was also changing with increasing pyrolysis temperature, such as the crystallinity of the carbon fiber and content of oxygen-containing functional groups decreased, the proportions of inorganic elements and pore shapes increased, and the surface was rougher. The adsorption processes on the three kinds of BCs were more consistent with the pseudo-second-order kinetic model(R22>0.96), and the adsorption equilibrium time was 3 h at reaction temperature 25 ℃, pH value 4, solid-liquid ratio 1:1(g:L). The adsorption isotherms of the three kinds of BCs were more consistent with Langmuir model, which indicated that chemical adsorption was the main process. The largest adsorption capacity of ZBC700 was 18.55 mg/g. The abilities of ZBC and DBC to adsorb U(Ⅵ) were enhanced with increasing pyrolysis temperature, simultaneously, the contribution utility of cation-π and ion exchange was increasing. Nevertheless, the relationship between the ability of MBC to adsorb U(Ⅵ) and pyrolysis temperature was not obvious, and the adsorption capacities of ZBC and DBC were higher than that of MBC at the same pyrolysis temperature.

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    Flame Retardant Modification of Bamboo Liquefied Wall Foam Materials
    Mengmeng WANG,Lequn LIU,Zhentao LIU,Ying ZHAO
    2020, 54 (5):  25-32.  doi: 10.3969/j.issn.1673-5854.2020.05.004
    Abstract ( 202 )   HTML ( 140 )   PDF (10680KB) ( 234 )   Save

    In order to improve the fireproof performance of the high-light foam wall materials prepared by the bamboo material liquefaction products, various methods of internal addition and surface immersion were used to carry out a variety of flame retardant modifications, and the effects of different flame retardants and their additions on the foam materials were evaluated. The expenmental effect of flame retardancy. The experimental results show that: adding the selected flame retardant inside or on the surface of the material will not have a significant impact on the morphology or composition of the material itself, and will not cause damage to the mechanical properties of the material. After adding 3 g of expanded gel-silica/ammonium polyphosphate core-shell flame retardant(MCAPP) inside the material, the compressive strength reached 0.37 MPa. The compressive strength after immersing the surface of the material with oxane reaches 0.58 MPa. At the same time, it can improve the flame retardance of the material. The limiting oxygen index increased to 33.2% after adding ammonium polyphosphate(M-APP) inside the material, which was 3% higher than before modification. After immersing the expanded chitosan-montmorillonite-ammonium polyphosphate(CMAp). The flame retardant was soaked on the surface of the material, the ignition time was significantly prolonged, and the limiting oxygen index reached 31.5%.

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    Industrial Refining Process of MES Surfactant
    Guoqiang SONG,Huan LI,Yinmei CAO,Long TANG
    2020, 54 (5):  33-36.  doi: 10.3969/j.issn.1673-5854.2020.05.005
    Abstract ( 268 )   HTML ( 132085 )   PDF (404KB) ( 364 )   Save

    α-sulfofatty acid methyl ester sodium salt(MES) with 70% active mass fraction product was added into 50-55 ℃ low boiling organic solvent of water soluble in heat and molten state. After cooling, crystallization, filtration and drying, high purity MES powder products were obtained. The experiment obtained the best optimum purification and refining process by investigating the low boiling organic solvent type of water soluble, feed quality ratio of raw materials and solvent, cooling temperature and crystallization time. And the optimum conditions were methanol as solvent, the mass ratio of MES and the feed 1:3, the cooling temperature 5 ℃, the crystallization time 120 min, the drying time 60 min, the drying temperature 45 ℃ and the solvent was used for three times and then distilled. Under these conditions, the recovery rate of the prepared MES powder product was greater than 98%, and the active mass fraction was greater than 93.0%. After the product was sealed and stored at 40 ℃ for 12 h, the sieving rate of sieve size of 0.850 mm reached 100%.

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    Preparation of High Purity Yacon Fructo-oligosaccharides by Nanofiltration and Its Characterization
    Xiaomeng QU,Ge YANG,Zehao ZHANG,Lan ZHANG
    2020, 54 (5):  37-44.  doi: 10.3969/j.issn.1673-5854.2020.05.006
    Abstract ( 245 )   HTML ( 152618 )   PDF (724KB) ( 409 )   Save

    The yacon fructo-oligosaccharides(FOS) was separated and purified by the nanometer membrane from yacon. A quadratic mathematical model for predioting the concentration of oligosaccharides was developed to optimize the purification process by Box-Behnken central composite design(CCD) and response surface methodology(RSM). Consequently, the optimized processing parameters were determined as operating pressure 0.15 MPa, circulation flow rate 5.3 mL/min, pH value 2.7, purification fold 5, the purity of the obtained FOS was 95.1%, which could reach P grade standard. HPLC-MS, IR, 1H NMR and 13C NMR were used to characterize the purity, composition and structure of FOS. The results showed that the purified FOS was composed of kestose, nystose and bestonentaose. The purity was 95.1% and it contained on average of 5 fructose units. The yacon FOS was mainly composed of β-furan-fructose tested by IR.

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    Review Comment
    Application Research Progress of Biological Pretreatment Technology in Extraction of Natural Products
    Weixing ZENG,Xian CHENG,Zuohui ZHANG,Liangwu BI,Zhendong ZHAO
    2020, 54 (5):  45-52.  doi: 10.3969/j.issn.1673-5854.2020.05.007
    Abstract ( 308 )   HTML ( 4132219 )   PDF (1639KB) ( 452 )   Save

    Biological pretreatment technology is applied to the extraction of natural products by the action of microorganisms or biological enzymes. Under appropriate conditions, the cell walls of natural resources are decomposed, which promotes the release of natural products into the extraction medium. Therefore, the efficiency of extraction and the activity of natural products are improved. Biological pretreatment technology includes microbial fermentation technology and biological enzyme assisted technology. This paper reviews the mechanism and application of two biological pretreatment techniques, aiming at providing reference for the development and utilization of natural products.

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    Research Progress in Preparation and Functional Application of Lignin-based Nanoparticles
    Xue LIU,Shujun LI,Shouxin LIU,Jian LI,Zhijun CHEN
    2020, 54 (5):  53-65.  doi: 10.3969/j.issn.1673-5854.2020.05.008
    Abstract ( 700 )   HTML ( 7079105 )   PDF (10179KB) ( 429 )   Save

    Lignin is a kind of abundant, cheap and sustainable natural biomass resource. Recently, converting lignin to functional nanomaterials has greatly broadened its application. Meanwhile, this conversion greatly solved the typical problems for traditional materials. Here, in this paper, several preparation methods including preparation of lignin functional nanoparticles such as self-assembly, mechanical method, polymerization assembly, freeze-drying carbonization, etc were introduced. And then their different applications in catalysts, additives, adsorbents, UV protection and anti-oxidation, sterilization, carrier materials, aggregation-inducing emmision materials, etc were described. Also, an outlook about the prospect of its application was presented. Developing controllable preparation and functional modification will facilitate the further application of lignin-based nanoparticles in the fields of environmental protection, energy, catalysis and biomedicine.

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    Research Progress on Activated Carbon Modification Technology
    Xiaopeng JIAN,Wei XU,Xinglong HOU,Shicai LIU
    2020, 54 (5):  66-72.  doi: 10.3969/j.issn.1673-5854.2020.05.009
    Abstract ( 500 )   HTML ( 5812309 )   PDF (1690KB) ( 664 )   Save

    Activated carbon has unique physical and chemical properties and is widely used in many fields such as industry, civil and national defense, and has an irreplaceable important role. Common activated carbon can not meet the needs of human production and life expansion, so further research on modified activated carbon technology has become a hot spot.In this paper, the research results of chemical modification(oxidation modification, reduction modification, acid and alkali modification, loading metal modification and plasma modification) and physical modification(high temperature heat treatment and microwave modification) of activated carbon were summarized, the technical characteristics of different modification methods were compared and the furture development of the modification technology was prospected.

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