以壳聚糖包裹酵母菌(CWY)为前驱体,在氮气保护条件下,400℃炭化制备出了石榴结构型多孔炭微球。利用扫描电镜、X射线衍射和红外光谱分别对CWY炭微球的形貌和物化结构进行了表征,测试了CWY炭微球的极性,并采用Boehm滴定法对其表面酸性基团进行了分析。结果表明:生成的酵母炭颗粒均匀镶嵌在CWY炭微球内,CWY炭微球在非极性溶液中表现出更好的分散性能,且其表面酸性基团总量为3.281mmol/g。考察了CWY炭微球对强力霉素废水的吸附处理能力,在碱性条件下,CWY炭微球对强力霉素废水(10mg/L)的吸附符合Langmiur模型,50℃时最大吸附量为3.07mg/g。
A novel porous carbon microspheres with pomegranate-like internal structure was synthesized by using chitosan wrapping yeasts (CWY) as precursor via thermal cracking under 400℃.The resultant CWY carbon composite microspheres were characterized by scanning electron microscope (SEM),X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR),respectively.The polarity of microspheres was explored.Boehm titration was involved to determine the contents of acidic groups on the surface of microspheres.The results showed the uniform distribution of internal yeasts carbon.Polarity test showed that the microspheres had a higher dispersion capacity in non-polar dissolvent.The contents of surface acidic groups on the microspheres were 3.281mmol/g.The adsorption capacity of microspheres was evaluated through doxycycline was used as an adsorbate under alkaline condition (pH=10).The equilibrium data of microspheres fitted well with the langmuir isothermal model,and the maximum theoretical adsorption capacity of microspheres for doxycycline was 3.07mg/g at 50℃.
[1] Bai F,Xia Y,Chen B,et al.Preparation and carbon dioxide uptake capacity of N-doped porous carbon materials derived from direct carbonization of zeolitic imidazolate framework[J].Carbon,2014,79(6):213-226.
[2] Fan Y,Liu P F,Huang Z Y,et al.Porous hollow carbon spheres for electrode material of supercapacitors and support material of dendritic Pt electrocatalyst[J].Journal of Power Sources,2015,280:30-38.
[3] 马森,卢家炯,初兰娜,等.超声波辅助提取啤酒废酵母中活性成分的研究[J].四川食品与发酵,2008,44(6):10-13.
[4] Guan Z,Liu L,He L,et al.Amphiphilic hollow carbonaceous microspheres for the sorption of phenol from water[J].Journal of Hazardous Materials,2011,196(12):270-277.
[5] Ni D,Wang L,Sun Y,et al.Amphiphilic hollow carbonaceous microspheres with permeable shells[J].Angewandte Chemie International Edition,2010,49(25):4223-4227.
[6] 腊明,陈昌东,冯云晓,等.富含中孔和微孔的生物质炭的制备及其吸附性能研究[J].现代化工,2014,34(9):103-105.
[7] 党昱,吴京凤,何云华,等.酵母基多孔炭微球的热裂解制备及其吸附性能研究[J].材料导报,2013,27(14):53-57.
[8] Mi F L,Wu Y B,Shyu S S,et al.Asymmetric chitosan membranes prepared by dry/wet phase separation:a new type of wound dressing for controlled antibacterial release[J].Journal of Membrane Science,2003,212(1-2):237-254.
[9] 丁珊,李立华,周长忍.壳聚糖对肝素微胶囊性能的影响[J].中国临床康复,2006,10(33):161-164.
[10] Thanou M,Verhoef J C,Junginger H E.Oral drug absorption enhancement by chitosan and its derivatives[J].Advanced Drug Delivery Reviews,2001,52(52):117-26.
[11] Luciani C V,Choi K Y,Han J J,et al.Polymer particles with a pomegranate-like internal structure via micro-dispersive polymerization in a geometrically confined reaction space I.experimental study[J].Macromolecular Theory & Simulations,2011,52(4):942-948.
[12] Liu Q,Duan Y,Shen S,et al.A simple route to prepare pomegranate-like polystyrene-based microspheres with high porosity[J].Polymer International,2011,60(9):1287-1290.
[13] Tadic M,Citakovic N,Panjan M,et al.Synthesis,morphology and microstructure of pomegranate-like hematite (α-Fe2O3) superstructure with high coercivity[J].Journal of Alloys & Compounds,2012,543:118-124.
[14] Feng D J,Bai B,Wang H L,et al.Enhanced mechanical stability and sensitive swelling performance of chitosan/yeast hybrid hydrogel beads[J].New Journal of Chemistry,2016,40(4)3350-3362.
[15] 张文标,李文珠,金首文,等.竹炭负载壳聚糖对Zn2+吸附动力学及其机制分析[J].浙江农林大学学报,2010,27(5):641-645.
[16] And M S,Fuertes A.Chemical and structural properties of carbonaceous products obtained by hydrothermal carbonization of saccharides[J].Chemistry (Weinheim an der Bergstrasse,Germany),2009,15(16):4195-203.
[17] 杨颖,李磊,孙振亚,等.活性炭表面官能团的氧化改性及其吸附机理的研究[J].科学技术与工程,2012,12(24):6132-6138.
[18] Salame I I,Bandosz T J.Surface chemistry of activated carbons:combining the results of temperature-programmed desorption,Boehm,and potentiometric titrations[J].Journal of Colloid & Interface Science,2001,240(1):252-258.
基金资助
陕西省自然科学基金项目(2015JM2071);中央高校基本科研业务费专项资金(310829162014);国家自然科学基金项目(21176031)
PDF
