磁性改性玉米秸秆材料吸附铬的性能及机理研究

doi:10.11894/iwt.2020-0102

摘要/Abstract

摘要：

采用柠檬酸、壳聚糖和Fe₃O₄对玉米秸秆进行改性，制备了复合材料SMC，用XRD、Zeta、BET、XPS表征秸秆改性前后结构和官能团的变化，研究pH对SMC吸附Cr（Ⅵ）效果的影响，用动力学与热力学模型拟合玉米秸秆的吸附动力学与等温吸附特征。结果表明：SMC结构疏松、孔隙增大，且具有较强的顺磁性；表面接枝羧基、氨基等基团，对铬的吸附能力提高。SMC对Cr（Ⅵ）的吸附可用准二级动力学方程描述，吸附热力学过程可用Freundlich模型描述，表明吸附过程为多分子层、吸热反应，且吸附过程中部分铬被还原。

关键词: 壳聚糖, 改性, 玉米秸秆, 铬, 重金属废水

Abstract:

After modification of corn straw by citric acid, chitosan and Fe₃O₄, composite SMC was prepared, and characterized by XRD, BET, Zeta and XPS. The effect of initial pH on the adsorption of chromium by SMC was studied. The adsorption kinetics and isotherm adsorption characteristics of corn straw were fitted by kinetic and thermody namic models. The results showed that SMC had loose structure, large pores, strong paramagnetism. The surface grafting of carboxy and amino groups was carried out, and the activity of each functional group was enhanced, which was beneficial to improve the adsorption capacity of chromium. The adsorption of chromium by SMC could be described by pseudo-second-order kinetic equation, which was characterized by endothermic reaction, and the thermodynamic process of adsorption of chromium could be described by Langmuir model. During the adsorption process, part of the chromium was reduced.

Key words: chitosan, modification, corn straw, chromium, heavy metal wastewater

中图分类号:

X703
TQ424

张铁军,李博,韩剑宏,姜庆宏,张连科,王维大. 磁性改性玉米秸秆材料吸附铬的性能及机理研究[J]. 工业水处理, 2020, 40(12): 100-105.

Tiejun Zhang,Bo Li,Jianhong Han,Qinghong Jiang,Lianke Zhang,Weida Wang. Study on adsorption performance and mechanism of chromium on magnetic modified corn stalk[J]. Industrial Water Treatment, 2020, 40(12): 100-105.

https://www.iwt.cn/CN/Y2020/V40/I12/100

图/表 10

参考文献 19

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初始质量浓度/ (mg·L^-1)	准一级动力学模型			准二级动力学模型
初始质量浓度/ (mg·L^-1)	Q_e/(mg·g^-1)	K₁/min^-1	R²	Q_e/(mg·g^-1)	K₂/min^-1	R²
50	22.490 3	0.126 0	0.896 6	23.711 7	0.213 0	0.983 2
80	33.268 1	0.142 1	0.888 7	34.911 2	0.249 0	0.993 2
100	44.555 0	0.139 9	0.897 7	46.741 0	0.247 2	0.984 7

初始质量浓度/ (mg·L^-1)	准一级动力学模型			准二级动力学模型
初始质量浓度/ (mg·L^-1)	Q_e/(mg·g^-1)	K₁/min^-1	R²	Q_e/(mg·g^-1)	K₂/min^-1	R²
50	22.490 3	0.126 0	0.896 6	23.711 7	0.213 0	0.983 2
80	33.268 1	0.142 1	0.888 7	34.911 2	0.249 0	0.993 2
100	44.555 0	0.139 9	0.897 7	46.741 0	0.247 2	0.984 7

温度/℃	Langmuir模型			Freundlich模型
温度/℃	Q_m/(mg·g^-1)	K₁/(L·mg^-1)	R²	n	K₂	R²
25	41.49	0.104 9	0.867 7	0.726	6.839 8	0.992 9
35	44.81	0.099 7	0.940 4	0.838	10.726 7	0.978 9
45	47.36	0.087 6	0.944 7	0.887	22.642 6	0.992 2

温度/℃	Langmuir模型			Freundlich模型
温度/℃	Q_m/(mg·g^-1)	K₁/(L·mg^-1)	R²	n	K₂	R²
25	41.49	0.104 9	0.867 7	0.726	6.839 8	0.992 9
35	44.81	0.099 7	0.940 4	0.838	10.726 7	0.978 9
45	47.36	0.087 6	0.944 7	0.887	22.642 6	0.992 2

T/K	lnK/ （kJ·mol^-1）	ΔG/ （kJ·mol^-1）	ΔS/ （J·mol^-1·K^-1）	ΔH/ （kJ·mol^-1）	R²
298.15	13.045	-0.582	105.308	53.688	0.964
308.15	20.071	-2.634
318.15	21.749	-4.012

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