采用冷冻诱导相分离法制备了二乙基三胺五乙酸(DTPA)改性的壳聚糖海绵状吸附材料,利用红外光谱、X射线衍射、扫描电镜等手段对吸附剂的官能团和结构进行了详细的表征;研究了pH、初始染料浓度、时间、温度对材料吸附行为的影响。结果表明:海绵状改性壳聚糖吸附剂为三维网格多孔洞结构,对甲基橙具有良好的吸附能力,最大吸附容量可达1585.43mg/g。吸附过程符合准二级动力学模型和朗缪尔模型,主要为化学吸附,吸附机理为静电作用和氢键作用。因此,该壳聚糖基海绵状复合材料可作为绿色吸附剂用于染料的吸附。
Diethyltriamine pentaacetic acid (DTPA)-modified sponge-like chitosan adsorbent was prepared by freezing induced thermal phase separation.The functional groups and structure of the adsorbent were characterized by FT-IR,XRD diffraction and SEM.The effects of pH value,initial dye concentration,contact time,temperature on adsorption behavior of the composite were investigated.The result suggested that the adsorbent had a three-dimensional lattice porous structure and exhibited good adsorption capacity for methyl orange,with a maximum adsorption capacity of up to 1585.43mg·g-1.The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir model,indicating that the adsorption of methyl orange by the adsorbent was mainly chemical adsorption.The adsorption mechanism was electrostatic interaction and hydrogen bonding.In conclusion,the diethyltriamine pentaacetic acid-modified sponge-like chitosan adsorbent could be used as green biological adsorbent for dye adsorption.
[1] Sharma J,Sharma S,Soni V.Classification and impact of synthetic textile dyes on Aquatic Flora:a review[J].Regional Studies in Marine Science,2021,45:101802.
[2] 靳君,张聪璐.多壁碳纳米管/壳聚糖复合材料对水中染料的吸附[J].工业水处理,2022,42(4):100-105.
[3] 段雨辰,王启航,花天滋,等.三维木基/壳聚糖复合吸附剂制备及对Pb(Ⅱ)的吸附性能研究[J].化工新型材料,2022,50(S1):213-219.
[4] 简宁,胡纪尧,张然,等.壳聚糖复合吸附材料的制备研究进展[J].辽宁化工,2023,52(2):259-261.
[5] Huang Y Y,Zheng H L,Hu X B,etal.Enhanced selective adsorption of lead(Ⅱ) from complex wastewater by DTPA functionalized chitosan-coated magnetic silica nanoparticles based on anion-synergism[J].Journal of Hazardous Materials,2022,422:126856.
[6] Surgutskaia N S,Di Martino A,Zednik J,et al.Efficient Cu2+,Pb2+ and Ni2+ ion removal from wastewater using electrospun DTPA-modified chitosan/polyethylene oxide nanofibers[J].Separation and Purification Technology,2020,247:116914.
[7] Wang Y T,Wang K Q,Lin J,etal.The preparation of nano-MIL-101(Fe)@chitosan hybrid sponge and its rapid and efficient adsorption to anionic dyes[J].International Journal of Biological Macromolecules,2020,165:2684-2692.
[8] Zhao X L,Wang X J,Lou T.Preparation of fibrous chitosan/sodium alginate composite foams for the adsorption of cationic and anionic dyes[J].Journal of Hazardous Materials,2021,403:124054.
[9] Li X,Wang S,Liu Y,et al.Adsorption of Cu(Ⅱ),Pb(Ⅱ),and Cd(Ⅱ) ions from acidic aqueous solutions by diethylenetriaminepentaacetic acid-modified magnetic graphene oxide[J].Journal of Chemical & Engineering Data,2016,62(1):407-416.
[10] Huang Y,Wu H,Shao T,et al.Enhanced copper adsorption by DTPA-chitosan/alginate composite beads:mechanism and application in simulated electroplating wastewater[J].Chemical Engineering Journal,2018,339:322-333.
[11] Kuang S P,Wang Z Z,Liu J,et al.Preparation of triethylene-tetramine grafted magnetic chitosan for adsorption of Pb(Ⅱ) ion from aqueous solutions[J].Journal of Hazardous Materials,2013,260:210-219.
[12] Pan J Y,Zhou L J,Chen H H,etal.Mechanistically understanding adsorption of methyl orange,indigo carmine,and methylene blue onto ionic/nonionic polystyrene adsorbents[J].Journal of Hazardous Materials,2021,418:126300.
[13] Pu Y H,Xie Z F,Gong X Y,etal.Study on removal of organic dyes by Fe3O4/amidation modified waste polystyrene composites[J].Environmental Technology & Innovation,2021,23:101732.
[14] He C,Lin H,Dai L,et al.Waste shrimp shell-derived hydrochar as an emergent material for methyl orange removal in aqueous solutions[J].Environment International,2020,134:105340.
[15] Lu F F,Dong A Q,Ding G J,et al.Magnetic porous polymer composite for high performance adsorption of acid red 18 based on melamine resin and chitosan[J].Journal of Molecular Liquids,2019,294:111515.
基金资助
国家青年科学基金项目(51703152);山西省自然科学基金项目(20210302124101和201901D111115)
PDF
