Amino-modified cellulose was prepared from pine sawdust with urea as modifier,and its adsorption properties for Cu2+ in wastewater were studied.The amino-modified cellulose was characterized by Fourier transform infrared spectrometer,scanning electron microscope,X-ray diffractometer,specific surface area and aperture analyzer,etc.The effects of temperature,solution pH,initial mass concentration of Cu2+ and time on the adsorption performance were investigated,and the effects of kinetics and thermodynamics of the adsorption process were also explored.The results showed that amino group was grafted onto pine sawdust cellulose.The amino-modified cellulose exhibited a porous structure,with a crystal type of cellulose Ⅰ.The crystallization index increased from 35.34% to 47.39%,the specific surface area decreased by 0.036m2/g,and the surface potential increased from -19.1mV to -6.03mV.When the adsorption time was 120min,temperature was 45℃,and pH was 5,the adsorption effect was the best,with an adsorption rate of 84.4% and an adsorption capacity of 6.75mg/g.The adsorption of Cu2+ by amine-modified cellulose conformed to the quasi-second-order kinetic model,and the Freundlich isothermal adsorption model could accurately describe the adsorption behavior.
[1] Maleki A,Hajizadeh Z,Sharifi V,et al.A green,porous and eco-friendly magnetic geopolymer adsorbent for heavy metals removal from aqueous solutions[J].Journal of Cleaner Production,2019,215:1233-1245.
[2] Yang R Q,Ma G G,Liu C L,et al.Effects of different heavy metal pollution levels on microbial community structure and risk assessment in Zn-Pb mining soils[J].Environmental Science and Pollution Research International,2023,30(18):52749-52761.
[3] Weng L,Lin J,Lv S J,et al.A bi-direction performance evaluation model for water pollution treatment engineering under the intuitionistic multiplicative linguistic environment[J].Journal of Intelligent & Fuzzy Systems,2023,44(3):4149-4173.
[4] Mohannad A J,Ahmad J,Ahmad K D.Heavy metal pollution and human health risk assessment for exposure to surface soil of mining area:a comprehensive study[J].Environmental Earth Sciences,2020,79(14):227-238.
[5] Shetaia S A,Nasr R A,Lasheen E S R,et al.Assessment of heavy metals contamination of sediments and surface waters of Bitter lake,Suez Canal,Egypt:ecological risks and human health[J].Marine Pollution Bulletin,2023,192:115096.
[6] Nirali K,Lavleen B,Mansi N.Wastewater treatment by ion exchange method:a review of past and recent researches[J].Environmental Science,2016,12:143-150.
[7] Zeng G,He Y,Zhan Y,et al.Novel polyvinylidene fluoride nanofiltration membrane blended with functionalized halloy-site nanotubes for dye and heavy metal ions removal[J].Journal of Hazardous Materials,2016,317:60-72.
[8] Tofan L,Suta D.Renewable resource biosorbents for pollutant removal from aqueous effluents in column mode[J].Separations,2023,10(2):143.
[9] Hou H,Li S Y,Meng Z C,et al.Removal of Cu ions in wastewater through a combined foam separation-cell adsorption approach[J].Chemical Engineering & Technology,2022,45(4):585-594.
[10] Elametr Y A,Elsayed A,Elesawi M A,et al.Optimizing the biosorption behavior of ludwigia stolonifera in the removal of lead and chromium metal Ions from synthetic wastewater[J].Sustainability,2021,13(11):6390.
[11] Xin H,Tao Z,Qing X,et al.Enhanced adsorption of Cu(Ⅱ) and Zn(Ⅱ) from aqueous solution by polyethyleneimine mo-dified straw hydrochar[J].Science of the Total Environment,2021,778:146116.
[12] 那立艳,张丽影,张凤杰,等.固液界面吸附热力学参数的计算[J].材料导报,2020,34(22):22030-22035.
[13] 王凡.改性花生壳纤维素的制备及其吸附性能研究[D].沈阳:沈阳理工大学,2020.
[14] 狄婧,刘海霞,姜永强,等.聚吡咯/壳聚糖复合膜的制备及其对Cu(Ⅱ)和Cr(Ⅵ)吸附机制[J].复合材料学报,2021,38(1):221-231.
[15] 施文健,陈肖云,张元璋,等.两性纤维素对持久性污染物的吸附特征[J].高分子材料科学与工程,2011,27(6):49-52.
[16] 沈王庆,李小雪,黄佳.改性柠檬渣的结构特征及其对Cu2+的吸附性能[J].环境科学研究,2016,29(1):146-154.
[17] 张海波,闫洋洋,程红艳,等.平菇菌糠生物炭对水体中Pb2+的吸附特性与机制[J].环境工程学报,2020,14(11):3170-3181.
[18] 毕景望,单锐,韩静,等.改性西瓜皮生物炭的制备及其对Pb(Ⅱ)的吸附特性[J].环境科学,2020,41(4):1770-1778.
[19] 梅杨璐,徐晋,张寅,等.氮改性对生物炭理化性质的影响及其对废水中铜离子的吸附特性[J].环境化学,2022,41(5):1796-1808.
[20] Marius G,Ionsl B,Giannin M.Removal of Cr(Ⅵ) from aqueous solutions by adsorption on MnO2[J].Journal of Hazardous Materials,2016,310:270-277.
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