采用共沉淀法将硫酸铁与水玻璃负载,制备出新型吸附剂硅酸铁,通过傅里叶变换红外光谱仪(FT-IR)、X射线粉末衍射仪(XRD)、扫描电镜(SEM)、BET和吸附-脱附表征手段测试分析,对该材料的各种物理化学性质进行表征,并系统地考察了吸附时间、吸附剂用量、温度及其溶液pH对模拟废水中苯酚吸附特性的影响。结果表明:该硅酸铁吸附剂比表面积高达560m2/g,平均孔径为3.5nm;当模拟废水中苯酚初始浓度为100mg/L,吸附剂加入量2g,吸附时间120min,吸附温度25℃,pH=7时,去除率和吸附量分别可达74%和3.7mg/g。吸附等温线拟合与Langmuir模型符合,因此其对苯酚的吸附是单分子层吸附。
A new ferric silicate adsorbent was prepared by coprecipitation method with iron sulfate and water glass.Through fourier transform infrared spectroscopy (FT-IR),X-ray powder diffractometry (XRD),scanning electron microscopy (SEM),BET,and the adsorption-desorption characterization method,the various physical and chemical properties of the material were tested and analyzed.The effects of adsorption time,adsorbent dosage,temperature and solution pH on the adsorption characteristics of phenol in simulated wastewater were systematically investigated.The results shown that the specific surface area of the adsorbent was as high as 560m2/g and the average pore diameter was 3.5nm.When the initial concentration of phenol in the simulated wastewater was 100mg/L,2g of the adsorbent was added,the adsorption time was 120min,the adsorption temperature was 25℃,and solution pH was 7,the removal rate and the adsorption amount were as high as 74% and 3.7mg/g,respectively.The adsorption isotherm fit was consistent with the Langmuir model,so the adsorption of phenol was monolayer adsorption.
[1] Basim Abussaud,Hamza A Asmaly,Ihsanullah,et al.Sorption of phenol from waters on activated carbon impregnated with iron oxide,aluminum oxide and titanium oxide[J].Journal of Molecular Liquids,2016,213:351-359.
[2] 张伟,韦朝海,彭平安,等.A/O/O生物流化床处理焦化废水中酚类组成及降解特性分析[J].环境工程学报,2010,4(2):253-258.
[3] Lin K L,Pan J Y,Chen Y W,et al.Study the adsorption of phenol from aqueous solution on hydroxyapatite nanopowders[J].Journal of Hazardous Materials,2009,161(1):231-240.
[4] 姬登祥,于凤文,艾宁,等.溶剂萃取法处理苯酚废水[J].实验室研究与探索,2010,29(6):24-26.
[5] Niu Y X,Xing M Y,Zhang J L,et al.Visible light activated sulfur and iron co-doped TiO2 photocatalyst for the photocatalytic degradation of phenol[J].Catalysis Today,2013,201:159-166.
[6] Guan Q Q,Wei C H,Shi H S,et al.Partial oxidative gasification of phenol for hydrogen in supercritical water[J].Applied Energy,2011,88(8):2612-2616.
[7] Dotto G L,Pinto L A A.Adsorption of food dyes acid blue 9 and food yellow 3 onto chitosan:stirring rate effect in kinetics and mechanism[J].Journal of Hazardous Materials,2011,187(1-3):164-170.
[8] Garoma T,Skidmore L.Modeling the influence of ethanol on the adsorption and desorption of selected BTEX compounds on bentonite and kaolin[J].Journal of Environmental Sciences,2011,23(11):1865-1872.
[9] Najafpoor A A,Dousti S,Jafari A J.Efficiency in phenol removal from aqueous solutions of pomegranate peel ash as a natural adsorbent[J].Social Science Electronic Publishing,2016,3(1),41-46.
[10] Wurzbacher J A,Gebald C,Steinfeld A.Separation of CO2 from air by temperature-vacuum swing adsorption using diamine-functionalized silica gel[J].Energy & Environmental Science,2011,4(9):3584-3592.
[11] Kadous A,Didi M,Villemin D.Removal of uranium (Ⅵ) from acetate medium using Lewatit TP 260 resin[J].Journal of Radioanalytical and Nuclear Chemistry,2011,288(2):553-561.
[12] Yang M,Huang Y,Cao H,et al.A novel polymeric adsorbent by a self-doped manner:synthesis,characterization,and adsorption performance to phenol from aqueous solution[J].Polymer Bulletin,2016,73(8):2321-2341.
[13] Fernandez E,Hugicleary D,Lopezramon M V,et al.Adsorption of phenol from dilute and concentrated aqueous solutions by activated carbons[J].Langmuir,2017,19(23):9719-9723.
[14] Rafatullah M,Sulaiman O,Hashim R,et al.Adsorption of methylene blue on low-cost adsorbents:a review[J].Journal of Hazardous Materials,2010,177(1-3):70-80.
[15] 侯炳江,沈吉敏,李太平.硅酸铁催化臭氧去除水中的阿特拉津和硝基苯[J].黑龙江大学自然科学学报,2015,32(2):223-228.
[16] Parmar K,Pramanik A K,Bandyopadhya N R,et al.Synthesis and characterization of Fe(Ⅲ)-silicate precipitation tubes[J].Materials Research Bulletin,2010,45(9):1283-1287.
[17] Zeng X,Yu T,Wang P,et al.Preparation and characterization of polar polymeric adsorbents with high surface area for the removal of phenol from water[J].Journal of Hazardous Materials,2010,177(1-3):773-780.
[18] 陈焕利,邢宝林,谌伦建,等.有机膨润土对模拟废水中苯酚的吸附特性[J].化工进展,2017,36(2):735-741.
[19] Luo Z X,Gao M L,Yang S F,et al.Adsorption of phenols on reduced-charge montmorillonites modified by bispyridinium dibromides:mechanism,kinetics and thermodynamics studies[J].Colloids & Surfaces A:Physicochemical & Engineering Aspects,2015,482:222-230.
[20] Vasiliu S,Bunia I,Racovita S,et al.Adsorption of cefotaxime sodium salt on polymer coated ion exchange resin microparticles:kinetics,equilibrium and thermodynamic studies[J].Carbohydrate Polymers,2011,85(2):376-387.