EGC复合材料的制备及其对Cr~(3+)的吸附性能
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摘要
采用溶液混合法制得功能化氧化石墨烯(E-GO)与壳聚糖(CS)的复合材料(EGC),对产物的形貌和结构进行了表征;将EGC用于Cr~(3+)的吸附,考察了E-GO含量、pH值、EGC投加量、吸附时间等因素对吸附效果的影响;结果表明E-GO呈表面光滑的片状结构,局部褶皱;CS结构致密,无明显孔隙;EGC则比CS更加光滑,无明显缝隙和孔状结构。当E-GO质量分数为25%,pH值为5时的吸附效果最佳;EGC投加量为0.3g·L~(-1)时,吸附效率可达99.0%;3h可达到吸附平衡;准二级动力学模型和朗格缪尔等温吸附方程对吸附过程拟合度较高;EGC重复使用性能良好。
The E-GO/CS composite was prepared by solution blend method. Morphology and structure of the EGC were characterized.Effects of E-GO concentration,pH value,EGC dosage,adsorption time on the adsorption behavior of EGC composite on Cr~(3+) were discussed. The results showed that E-GO was smooth and flake with folds,CS was compact without obvious pore,EGC was more smooth than CS without obvious crevice and pore. Effect of adsorption was best when mass fraction of the E-GO was 25%,pH value was 5. The adsorption efficiency could be 99.0% when the EGC dosage was 0.3 g·L~(-1). The adsorption equilibrium was obtained in 180 mins. The adsorption process could be highly fitted by pseudo-second-order kinetic model and Langmuir equation. The reusability of the composite was excellent.
The E-GO/CS composite was prepared by solution blend method. Morphology and structure of the EGC were characterized.Effects of E-GO concentration,pH value,EGC dosage,adsorption time on the adsorption behavior of EGC composite on Cr~(3+) were discussed. The results showed that E-GO was smooth and flake with folds,CS was compact without obvious pore,EGC was more smooth than CS without obvious crevice and pore. Effect of adsorption was best when mass fraction of the E-GO was 25%,pH value was 5. The adsorption efficiency could be 99.0% when the EGC dosage was 0.3 g·L~(-1). The adsorption equilibrium was obtained in 180 mins. The adsorption process could be highly fitted by pseudo-second-order kinetic model and Langmuir equation. The reusability of the composite was excellent.
引文
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[3] 刘帅霞. 两段式还原工艺解毒铬渣技术研究[D]. 上海:东华大学,2013.
[4] Tokalsoglu S. Indirect speciation of Cr(Ⅲ) and Cr(Ⅵ) in water samples by selective separation and preconcentration on a newly synthesized chelating resin[J]. Analytica Chimica Acta,2009,645(2):36-41.
[5] 赵进才,塔里克,王齐,等. 无需外加还原剂和牺牲剂的处理含铬废水的光化学还原方法:中国专利,200810104379.5[P]. 2008-07-17.
[6] 占金宝,苏海佳. 青霉菌丝体分子印迹吸附膜对 Cr(Ⅲ)的吸附性能[J]. 北京化工大学学报:自然科学版,2010,37(4):94-96.
[7] 周隽,翟建平,吕慧峰,等. 木屑和花生壳吸附去除水溶液中Cr3+的试验研究[J]. 环境污染治理技术与设备,2006,7 (1):122-125.
[8] Varma A J,Deshpande S V,Kennedy J F. Metal complexation bychitosan and its derivatives:a review[J]. Carbohydrate Polymers,2004,55(1):77-93.
[9] 赵娜,金烨纯. 壳聚糖交联螺旋藻小球对Cr(VI)的吸附作用研究[J]. 生态环境学报,2016,25(6):994-1000.
[10] Stoller M D,Park S J,Zhu Y W,et al. Graphene-based ultracapacitors[J]. Nano Letters,2008,8(10):3498-3502.
[11] Gomez-Navarro C,Burghard M,Kern K. Elastic properties of chemically derived single graphene sheets[J]. Nano Letters,2008,8(07):2045-2049.
[12] 庄媛,于飞. 石墨烯去除水中重金属和抗生素的研究进展[J]. 功能材料,2014,45(23):23001-23008.
[13] 谢普,吕晴. 石墨烯的制备和改性及其与聚合物复合的研究进展[J]. 材料导报,2010,24(11):163-166.
[14] 张丽,田艳红,张学军,等. 石墨烯/ABS树脂复合体系的阻燃性能[J]. 高分子材料科学与工程,2013,29(5):63-66.
[15] Sorlier P,Denuziere A,Viton C,et al. Relation between the Degree of Acetylation and the Electrostatic Properties of Chitin and Chitosan[J]. Biomacromolecules,2001,2(3):765-772.
[16] He Y Q,Zhang N N,Wang X D. Adsorption of grapheme oxide/chitosan porous materials for metal ions[J].Chinese Chemical Letters,2011,22(7):859-862.
[17] 罗南,张晓影,李晓军,等. 虾壳和松树皮对水中三价铬的吸附性能研究[J]. 环境科学与技术,2017,40(6):44-48.
[18] 李仕友,史冬峰,唐振平,等. 壳聚糖/氧化石墨烯复合材料吸附U(Ⅵ)的特性与机理[J]. 环境科学学报,2017,37(4):1388-1395.
[19] 季雪琴,吕黎,陈芬,等.秸秆生物炭对有机染料的吸附作用及机制[J].环境科学学报,2016,36(5):1618-1654.