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    30 May 2018, Volume 52 Issue 3 Previous Issue    Next Issue
    Preparation and Adsorption of Methyl Orange Imprinted Magnetic Chitosan Polymer
    LI Man, CAI Zhaosheng, FANG Guigan, LIANG Long, ZHOU Jing
    2018, 52 (3):  1-8.  doi: 10.3969/j.issn.1673-5854.2018.03.001
    Abstract ( 464 )   PDF (2211KB) ( 565 )   Save
    Magnetic chitosan(Fe3O4@CTS) microspheres were prepared through sol-gel method firstly. Then, a novel, magnetic molecularly imprinted polymers(MMIPs) were synthesized by aqueous solution polymerization with Fe3O4@CTS as support and functional monomer and methyl orange as template molecules. Characterizations of the obtained MMIPs were achieved by SEM, XRD, FT-IR and VSM. Batch adsorption experiments were performed to investigate the adsorption conditions, selectivity and reusability of the adsorption of MO on MIMPs. The results showed that the maximum adsorption capacity was 113.16 mg/g and equilibrium adsorption was achieved around 60 min observed at pH value 6.5 and temperature 25℃, and the MMIPs had specific adsorption capacity for MO compared with the non-imprinted magnetic particles(NIMPs). Adsorption process could be well described by Langmuir adsorption isotherms and the kinetic data could be fitted with pseudo-second-order equation. Furthermore, the selectivity coefficient of MO and other dyes onto MMIPs indicated an overall preference with the maximum selectivity coefficient(K) of 2.85. Moreover, MMIPs could be separated by external magnet, which could be reused for 5 times with a high adsorption efficiency overall 90% after desorption.
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    Preparation of Mesoporous-activated Carbon from Amygdalus Pedunculata Shell by Steam Activation
    LI Shaoni, SUN Kang, SHEN Yehua, LI Cong, LI Jihui
    2018, 52 (3):  9-15.  doi: 10.3969/j.issn.1673-5854.2018.03.002
    Abstract ( 585 )   PDF (3368KB) ( 633 )   Save
    Activated carbon with developed mesopore were prepared from Amygdalus pedunculata shell by steam activation at different technology condition. The effects of carbonization temperature, activation temperature, activation time and steam dosage on the adsorption properties and yield of resulting activated carbon were analyzed. The results showed that the optimal activated carbon was obtained at carbonization temperature 600℃, activation temperature 850℃, activation time 60 min and steam/carbide weight ratio 6:1, whose yield, iodine value, methylene blue value, mesopore ratio, BET surface area and average pore size were 12%, 1 175 mg/g, 315 mg/g, 60.9%, 1 127 m2/g and 2.6 nm, respectively. Besides, the results of adsorption experiment indicated that the activated carbon prepared at the optimal conditions was promising absorbent for cephalexin, the equilibrium adsorption capacity could reach 245 mg/g after 24 h, which was higher than that of coconut shell activated carbon and walnut shell activated carbon prepared under the same conditions.
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    Activation Processes of Wood Fiber Under Freezing by NaOH/urea Aqueous Solution
    MA Panpan, CHEN Bingyu, DI Mingwei
    2018, 52 (3):  16-22.  doi: 10.3969/j.issn.1673-5854.2018.03.003
    Abstract ( 581 )   PDF (765KB) ( 538 )   Save
    The wood fiber was activated by sodium hydroxide/urea mixed aqueous solution under freezing treatment. The freezing activation effect of wood fiber was characterized by measuring the mechanical properties of the self-bonding fiberboard hot-pressed with activated wood fiber and implementing the analysis of Fourier tansform infrared spectroscopy and X-ray diffraction. The experimental results showed that the sodium hydroxide/urea mixed aqueous solution had a certain activation effect on the wood fiber under freezing treatment. The optimized activated process was described as the mass ratio of total sodium hydroxide and urea (the mass ratio of sodium hydroxide to urea 7:12) to wood fiber 1:12, freezing temperature -15℃, freezing time 1.0 h, and wood fiber moisture content 20%. The static bending strength and internal bonding strength of fibreboard prepared with wood fiber freezing-activated by sodium hydroxide/urea mixed aqueous solution increased from 32.16 and 0.29 MPa to 45.53 and 1.21 MPa, and the water absorption rate and the thickness swelling rate decreased from 53.95% and 22.57% to 43.62% and 10.34% respectively compared to those of the unactivated wood fiber. Microscopic characterization by Fourier tansform infrared spectroscopy and X-ray diffraction showed that the hydrogen bonding structure of cellulose in the wood fiber was destroyed under the freezing activation treatment with sodium hydroxide/urea mixed solution, the expansion of cellulose I lattice was promoted and a new crystalline modification was produced, which reduced the degree of molecular association and consequently enhanced the hydroxyl activity of the wood fiber surface.
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    One-step Catalytic Synthesis and Herbicidal Activity of (1S,4R)-4,7,7-Trimethyl-6-oxabicyclo[3.2.1] octane-1,4-diol
    XIE Zhipeng, HUANG Daozhan, HUANG Yanpei, HUANG Yanni
    2018, 52 (3):  23-28.  doi: 10.3969/j.issn.1673-5854.2018.03.004
    Abstract ( 575 )   PDF (902KB) ( 539 )   Save
    (1S,4R)-4,7,7-trimethyl-6-oxabicyclo[3.2.1]octane-1,4-diol(2) was synthesized from terpinolene by using hexadecyl pyridinium peroxo heteropolyoxomolybdotungstate(HPP) as redox-acid bifunctional catalyst and 30%(mass fraction) H2O2 as oxidant. The optimal conditions for the reaction were terpinolene 4 mmol, HPP catalyst 7.35%(calculated by the mass of terpinolene), solvent chloroform 0.8 mL, the reaction material ratio(molar ratio of H2O2 and terpinolene) 3, reaction temperature 35℃, reaction time 6 h. Under these conditions, the conversion rate of terpinolene reached 100% and the yield of compound 2 reached 29%. The molecular structure was identified by means of IR, NMR and single crystal X-ray diffraction. The preliminary herbicidal activity assay indicated that compound 2 showed excellent inhibitory effect against the root growth and shoot elongation of ryegrass(Lolium rigidum); the inhibition rates against the root growth and shoot elongation were up to 91.8% and 80.7%, respectively, at the concentration of 120 mmol/L. Compared with the reported 1, 8-cineole, compound 2 had better inhibitory effect on ryegrass.
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    Activated Carbon Prepared with Phosphoric Acid Activation by Mechanical Force Pretreatment Method and Conventional Method
    LIN Xing, YANG Xuan, CAI Zhenghan, LIN Guanfeng, LI Yuhua, HUANG Biao
    2018, 52 (3):  29-34.  doi: 10.3969/j.issn.1673-5854.2018.03.005
    Abstract ( 617 )   PDF (835KB) ( 677 )   Save
    The activated carbon was prepared from kenaf rod core by mechanical force pretreatment process and conventional process with phosphoric acid as activator. The effects of activation time on the yield, adsorption performance of the kenaf rod based-activated carbon were discussed. The pore structure characteristics were characterized by specific surface area and pore size analyzer and the surface functional groups were characterized by Fourier transform infrared spectroscopy. The results showed that compared with the conventional process, the mechanical force pretreatment process made phosphoric acid permeate into the inner layer of raw material to strengthen the activation efficiency, which improved the yield, adsorption performance, BET specific surface area and pore volume of kenaf rod based-activated carbon. Under the activation time 90 min, the yield, iodine adsorption value, methylene blue adsorption value, BET specific surface area and total pore volume of the activated carbon prepared by mechanical force pretreatment process were 50.24%, 1 024 mg/g, 275 mg/g, 1 625.42 m2/g and 0.762 cm3/g, respectively. According to pore size analysis, activated carbons prepared by the two methods were mainly microporous and contained a certain number of mesopores. It was known from infrared spectrum analysis that the mechanical force pretreatment process didn't destroy the basic structure of activated carbon. The surface of kenaf rod based-activated carbon prepared by the two methods contained oxygen-containing functional groups, such as —OH,C—O and C=O groups.
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    Synthesis and Application of Melamine Urea Formaldehyde Monolithic Resin Modified by Enzymolysis Lignin
    GUO Tengfei, GAO Shishuai, WANG Chunpeng
    2018, 52 (3):  35-39.  doi: 10.3969/j.issn.1673-5854.2018.03.006
    Abstract ( 576 )   PDF (610KB) ( 593 )   Save
    The enzymolysis lignin modified melamine urea formaldehyde resin(ELMUF) was prepared by using the classic alkali-acid-alkali method with enzymolysis lignin(EL), urea(U), formaldehyde(F) and melamine(M) as raw materials. The influences of the amount of EL on the curing time, curing temperature, free formaldehyde content, the strength and formaldehyde release of the plywood obtained from the prepared ELMUF resin were investigated. With the increase of the amount of EL, the free formaldehyde content decreased from 0.26% to 0.12%, the curing time increased from 96 s to 152 s and the viscosity increased from 86 mPa·s to 1 140 mPa·s. The curing process of resins with different amounts of EL was determined by DSC. The results showed that the introduction of EL could reduce the reactivity of the urea-formaldehyde resin. With the increase of the amount of EL, the curing temperature increased from 120.6℃ to 132.0℃, which required the hot pressing process requirements to be more stringent.
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    Microwave Assisted Liquefaction of Coconut Fiber
    WU Jun, XU Shuying, MENG Fanrong, ZHANG Jie, ZHANG Yucang, WANG Dun
    2018, 52 (3):  40-44.  doi: 10.3969/j.issn.1673-5854.2018.03.007
    Abstract ( 529 )   PDF (743KB) ( 478 )   Save
    Liquefaction of coconut fiber assisted via microwave irradiation was carried out with the mixture of macrogol 400(PEG-400) and glycerol(Gl) as liquefied reagent and concentrated sulfuric acid as catalyst. The liquefaction rates were obtained at different reaction time, amount of catalyst, temperature, the mass ratio of PEG-400 and Gl and the mass ratio of liquefied reagent and coconut fiber. The results showed that the optimal conditions for the liquefaction were liquefied reagent and coconut fiber mass ratio 5:1, the amount of sulfuric acid 3%(relative to the mass of liquefied reagent), reaction temperature 160℃, reaction time 20 min, PEG-400 and Gl mass ratio 4:1, the highest liquefaction rate was 88.83% under these conditions. And the viscosity(25℃) and density(20℃) of liquefied product were 0.235 Pa·s and 1.084 g/cm3. According to the different reaction time, the molecular weight of the liquefied products were analyzed by GPC. The results showed that weight average molecular mass and dispersion coefficient increased gradually with the increase of reaction time. The infrared spectroscopy analysis showed that during the liquefaction, the cellulose, lignin and some aliphatic hydrocarbon were liquefied and the liquefied product with abundant hydroxyl was obtained and some of the cellulose and lignin in the liquefaction residue was still not liquefied.
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    Synthesis and Application Progress of Water Soluble Rosin Resin
    ZHAI Zhaolan, GAO Hong, SHANG Shibin, SONG Zhanqian, LING Qinghua, ZHOU Guangping
    2018, 52 (3):  45-49.  doi: 10.3969/j.issn.1673-5854.2018.03.008
    Abstract ( 777 )   PDF (723KB) ( 744 )   Save
    The synthesis of water soluble rosin resin and its application were reviewed.The synthesis of water soluble rosin resin from rosin and modified rosin (maleic rosin,acrylic rosin and fumaric rosin),and its application in water-based ink,water-based paint and etc.were mainly discussed.Moreover,the prospective direction of water soluble rosin resin was given.
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    Research Development of Botanical Extract as Feed Additive in Poultry
    WANG Xiaojie, HUANG Lixin, ZHANG Caihong, XIE Pujun, DING Shasha, DENG Yejun
    2018, 52 (3):  50-58.  doi: 10.3969/j.issn.1673-5854.2018.03.009
    Abstract ( 765 )   PDF (1150KB) ( 763 )   Save
    The raw material sources, active ingredients and extraction process of botanical extract and its functional and safety evaluation as feed additive are summarized. The active ingredients of plant extracts mainly include plant polyphenols, alkaloids, volatile oils, organic acids, polysaccharides and plant pigments. The extraction processes include supercritical fluid extraction, subcritical fluid extraction, enzymatic extraction and semi-bionic extraction, etc. Botanical extract with antioxidant and antibacterial properties can improve the poultry gastrointestinal functions and production performances.
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    Synthesis and Application Progress of Terpene-based Polymer Materials
    GUO Jiawen, CHEN Lijing, WANG Jun, XU Xu
    2018, 52 (3):  59-64.  doi: 10.3969/j.issn.1673-5854.2018.03.010
    Abstract ( 528 )   PDF (810KB) ( 593 )   Save
    As a renewable biomass resource, terpene compounds are widely found in the nature. Its molecular structure includes unsaturated carbon-carbon double bond and other active functional groups. The terpene-based polymer materials can be synthesized through addition, oxidation, polymerization, isomerism and other reactions. They can be used in the fields of surface active agents, paint coating, adhesives, composites and so on. The synthesis and application of terpene-based epoxy resin, terpenyl-cyclic carbonate, terpene-based polyurethane and other terpene-based polymers are reviewed. Moreover, the prospective direction of terpene-based polymer materials in the future is given as well.
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