纤维素/硅藻土复合气凝胶球的制备及其吸附性能的研究?
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摘要
以碱脲试剂作为溶解体系,采用冷冻干燥法制备出不同质量分数的纤维素/硅藻土复合气凝胶球,并通过扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FT-IR)检测手段对复合气凝胶进行表征。结果表明复合气凝胶内部仍呈现出疏松多孔的三维网状结构,硅藻土附着在纤维素链上,同时复合气凝胶具有纤维素Ⅱ型特征峰。此外考察了硅藻土含量、亚甲基蓝溶液浓度以及pH对复合气凝胶吸附性能的影响,结果表明在最佳条件下,复合气凝胶对亚甲基蓝的最大吸附量可达71.942 4 mg/g,吸附过程满足伪二级动力学方程学。
Cellulose/diatomaceous earth composite aerogel spheres with different mass fractions were prepared by freeze-drying with urea reagent as the dissolution system. The composite aerogel was characterized by scanning electron microscope(SEM) and Fourier transform infrared spectroscopy(FT-IR).The results show that composite aerogel internal still present a porous three-dimensional network structure, attached to the cellulose backbone diatomite, with cellulose type Ⅱ characteristic peak. At the same time, the influences of diatomite content,methylene blue solution concentration and pH on the adsorption performance of the compound aerogel were investigated. The results show that under the optimal conditions, the maximum adsorption capacity of the compound aerogel on the methylene blue could reach 71.479 6 mg/g, and the adsorption process met the pseudo-second-order kinetic equation.
Cellulose/diatomaceous earth composite aerogel spheres with different mass fractions were prepared by freeze-drying with urea reagent as the dissolution system. The composite aerogel was characterized by scanning electron microscope(SEM) and Fourier transform infrared spectroscopy(FT-IR).The results show that composite aerogel internal still present a porous three-dimensional network structure, attached to the cellulose backbone diatomite, with cellulose type Ⅱ characteristic peak. At the same time, the influences of diatomite content,methylene blue solution concentration and pH on the adsorption performance of the compound aerogel were investigated. The results show that under the optimal conditions, the maximum adsorption capacity of the compound aerogel on the methylene blue could reach 71.479 6 mg/g, and the adsorption process met the pseudo-second-order kinetic equation.
引文
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[2]赵阳,赵玉真,张永明,等.功能化氧化石墨烯/纤维素共混复合材料对Pb2+吸附性能的研究[J].纤维素科学与技术,2018,26(3):39-44.
[3]高鹤,梁大鑫,李坚.纤维素气凝胶材料研究进展[J].科技导报,2016,34(19):138-142.
[4]Yang X.Hydrogels and aerogels based on chemicallly cross-linked cellulose nanocc rystals[D].Ha amilton:Mc Ma ster Unicersity,2014.
[5]李经方,刘志明,廖平,等.Ce-N共掺杂TiO2/纤维素气凝胶的制备及光催化性能[J].纤维素科学与技术,2017,25(3):14-19.
[6]吴鹏,刘志明,刘昕昕,等.毛竹纳米纤丝化纤维素球形气凝胶的制备和表征[J].现代化工,2015,35(3):62-65.
[7]Zubairu S M J,Uzairu A,Iyun J F,et al.Methylene blue adsorption from glycerol solution onto the acicular habit ofα-goethite[J].Bulletin of the Chemical Society of Ethiopia,2011,25(1):25-35.
[8]刘志明,杨少丽,吴鹏.再生竹纤维球形介孔气凝胶的表征[J].科技导报,2014,32(Z1):69-73.
[9]Nelson M L,O'connor R T.Relation of certain infrared bands to cellulose crystallinity and crystal latticed type.Part I.Spectra of lattice typesⅠ,Ⅱ,Ⅲand of amorphous cellulose[J].Journal of Applied Polymer Science,1964,8(3):1311-1324.
[10]唐丽荣,黄彪,戴达松,等.纳米纤维素碱法制备及光谱性质[J].光谱学与光谱分析,2010,30(7):1876-1879.
[11]陈嘉翔,余家鸾.植物纤维化学结构的研究方法[M].广州:华南理工大学出版社,1989:5-6.
[12]吴鹏,刘志明.海藻酸钠/纤维素水凝胶球的制备与应用[J].功能材料,2015,46(10):10144-10147,10152.
[13]Arfaoui S,Frini-Srasra N,Srasra E.Modelling of the adsorption of the chromium ion by modified clays[J].Desalination,2008,222(1):474-481.
[14]刘亚纳,周鸣,汤红妍,等.亚甲基蓝在污泥活性炭上的吸附[J].环境工程学报,2012,6(7):2339-2344.
[15]Caliskan N,Kul A R,Alkan S,et al.Adsorption of Zinc(Ⅱ)on diatomite and manganese-oxide-modified diatomite:A kinetic and equilibrium study[J].Journal of Hazard Materials,2011,193(10):27-36.
[16]何边阳,郑婷婷,王丰喜,等.纤维素/硅藻土复合气凝胶的吸附性能[J].环境工程学报,2016,10(6):3005-3011.
[17]XIE Fei,WANG Yan Li,ZHAN Liang,et al.Adsorption/desorption performance of CO2 on pitch-based spherical act ivated carbons[J].Journal of Inorganic Materials,2010,26(2):149-154.
[18]李婧,刘志明,余慧,等.羧基化改性纤维素凝胶球的制备和表征[J].生物质化学工程,2016,50(4):21-25.
[19]Mojtaba Hedayati Marzbali,Mohamad Esmaieli.Fixed bed adsorption of tetracycline on a mesoporous activated carbon:Experimental study and neuro-fuzzy modeling[J].Journal of Applied Research and Technology,2017,15(5):454-463.
[20]Enos W Wambu,Gerald K Muthakia,Joseph K wa-Thiong’o,et al.Kinetics and thermodynamics of aqueous Cu(Ⅱ)adsorption on heat regenerated spent bleaching earth[J].Bulletin of the Chemical Society of Ethiopia,2011,25(2):181-190.
[21]孙青,祁琪,张俭,等.磁性ZnFe2O4/埃洛石复合材料的结构及吸附性能研究[J].无机材料学报,2018,33(4):390-396.