以沙柳木粉为原料,采用无水乙醇、氢氧化钠、氯乙酸对沙柳木粉改性,制备羧甲基化沙柳木粉(CMS)。研究氢氧化钠浓度、羧甲基化反应时间和反应温度等制备条件对CMS吸附铅离子(Pb2+)的影响。采用扫描电子显微镜(SEM)、傅里叶红外光谱(FT-IR)和X射线衍射(XRD)等表征手段对CMS的微观结构进行分析。研究结果表明:在氢氧化钠浓度为15%,羧甲基化反应时间为2h,反应温度为60℃条件下,CMS对Pb2+的吸附量最大达到71.55mg/g。改性后的沙柳木粉表面变得疏松,呈现多孔的网状结构,沙柳木粉被羧甲基化了。
The carboxymethyl salix psammophila powder(CMS) was prepared by salix psammophila as raw material,anhydrous ethanol,sodium hydroxide and chloroacetic acid as the reaction reagent.The effects of preparation conditions such as sodium hydroxide concentration,carboxymethylation reaction time and temperature on the adsorption properties of CMS for lead ion(Pb2+) were studied.The microstructure of CMS was characterized by scanning electron microscope(SEM),fourier infrared spectrometer(FT-IR) and X-ray diffractometer(XRD).The results showed:the adsorption capacity of CMS reached a maximum of 71.55mg/g as the concentration of sodium hydroxide was 15%,the reaction time was 2h and temperature was 60℃.The characterization results showed that the powder was carboxymethylated by —CH2COOH,and the surface of CMS became loose and showed a porous network structure.
[1] 中国工程院,环境保护部.中国环境宏观战略研究[M].北京:中国环境科学出版社,2011,12-98.
[2] Wang L,Zhang J P,Wang A Q.Fast removal of methylene blue from aqueous solution by adsorption onto chitosan-g-poly(acrylic acid)/attapulgite composite[J].Desalination,2011,266(1/3):33-39.
[3] Huang J H,Liu Y F,Wang X G.Selective sorption of tannin from flavonoids by organically modified attaplgite clay[J].J Hazard Master,2008,160(2/3):382-387.
[4] Xue A,Zhou S,Zhao Y,et al.Adsorption of reactive dyes from aqueous solution by silylatedpalygorskite[J].Appl Clay Sci,2010,48(4):638-640.
[5] Zou X H,Pan J M,Ou H X,et al.Sorptive removal of Cr(Ⅲ) and Fe(Ⅲ) from aqueous solution by chitosan/attapulgite composite:equilibrium,thermodynamics and kinetics[J].Chem Eng J,2011,167(1):112-121.
[6] 黄海涛,梁延鹏,魏彩春,等.水体重金属污染现状及其治理技术[J].轻工科技,2009,5(5):99-100.
[7] 李增新,薛淑云.廉价吸附剂处理重金属离子废水的研究进展[J].环境污染治理技术与设备,2006,7(1):6-11.
[8] 周殷,胡长伟,李鹤,等.柚子皮吸附剂的物化特性研究[J].环境科学与技术,2010,33(11):87-91.
[9] 陈瑛,金叶飞,王秀琴,等.水葫芦各部位富集能力的研究[J].环境保护科学,2004,30(123)31-35.
[10] 黄明星.沙柳制备微晶纤维素的工艺研究[D].郑州:郑州大学,2014.
[11] 陈强,黄萍,罗彦卿,等.林木生物质化学品的开发利用研究进展[J].生物质化学工程,2012,46(6):40-46.
[12] Zhou H Y,Cao P P,Li J B,et al.Preparation and release kinetics of carboxymethyl chitosan/cellulose acetate microspheres as drug delivery system[J].Journal of Applied Polymer Science,2015,132(26):26-32.
[13] Spychaj T,Wilpiszewska K,Zdanowicz M.Medium and high substituted carboxymethyl starch:synthesis,characterization and application[J].Starch Stärke,2013,65(1/2):22-33.
[14] Narayanan D,Jayakumar R,Chennazhi K P.Versatile carboxymethyl chitin and chitosan nanomaterials:a review[J].Wiley Interdisciplinary Reviews Nanomedicine & Nanobiotechnology,2014,6(6):574-598.
[15] 张东北,汪和木,赵忠北,等.杉木木粉羧甲基化产物及其高吸水树脂特性的研究[J].浙江林业科技,2010,30(4):1-5.
[16] 闫永海.棉织物羧甲基化改性工艺研究[D].青岛:青岛大学,2013.
[17] 赵鹏,张婷婷,宋逍,等.倒卵叶五加多糖的羧甲基化工艺及抗氧化性[J].化工进展,2015,34(1):219-223.
[18] Wang Yawen,Li Aimin,Yang Hu.Effects of substitution degree and molecular weight of carboxymethyl starch on its scale inhibition[J].Desalination,2017,408:60-69.
[19] 朱昌玲,史劲松,孙达峰,等.羧甲基壳聚糖的制备及其在保鲜中的应用[J].南京野生植物研究院,2010,29(3):7-11.
[20] 王格慧,宋湛谦.多胺型螯合棉纤维的制备与吸附性能研究[J].林产化学与工业,2000,20(2):9-12.
[21] 朱昌玲,史劲松,孙达峰,等.羧甲基壳聚糖的制备及其在保鲜中的应用[J].中国野生植物资源,2010,29(3):41-45.
[22] 张楠楠,朱平.羧甲基化改性纤维素医用敷料的制备与性能研究[D].武汉:武汉纺织大学,2013.
[23] 陈明凤.纤维素的去结晶[D].广州:华南理工大学,2011.
基金资助
内蒙古自然科学基金(2016MS0210);内蒙古农业大学优秀青年科学基金(2014XYQ-12)
PDF
(2131KB)
