C@K2Ti6O13分级纳米材料对Cr(VI)的吸附去除

doi:10.15541/jim20190370

摘要/Abstract

摘要：

Cr(VI)具有非常大的生物毒性, 去除溶液中的Cr(VI)是当前的一个研究热点。本研究制备了C@K₂Ti₆O₁₃分级纳米材料, 并用不同表征手段对材料的物相和结构等进行表征, 进一步探究了初始pH、吸附时间、离子强度等对C@K₂Ti₆O₁₃复合纳米结构吸附Cr(VI)的影响。实验结果表明C@K₂Ti₆O₁₃复合纳米结构对Cr(VI)有较强的吸附能力, 1 h内去除率能够达到50%以上, 其吸附动力学符合准二级动力学模型, 吸附热力学符合Langmuir等温吸附模型, 表明这种分级纳米材料在环境治理方面应用潜力巨大。

关键词: 环境, C@K₂Ti₆O₁₃, Cr(VI), 吸附

Abstract:

Cr(VI) is toxic to the organic life. Eliminating the pollutant of Cr(VI) in solution has become a hot research field. In this work, the C@K₂Ti₆O₁₃ hierarchical nanomaterials were prepared by liquid phase deposition combined with hydrothermal treatment, which were constituted by carbon nano spheres and K₂Ti₆O₁₃ nanobelts. The morphology and phase of the materials were characterized by different methods. The C@K₂Ti₆O₁₃ hierarchical nanomaterials show high potential as adsorbent to adsorb Cr(VI). Effect of initial pH, adsorption time and ionic strength on Cr(VI) adsorption by C@K₂Ti₆O₁₃ composite nanostructures were investigated. The elimination rate of Cr(VI) can reach 50% in 1 h. The adsorption kinetics agrees well with the pseudo- second-order kinetic model, and the adsorption thermodynamics accords with the Langmuir isotherm adsorption model. It can be expected that the C@K₂Ti₆O₁₃ hierarchical nanomaterials have great application potential in environmental treatment.

Key words: environment, C@K₂Ti₆O₁₃, Cr(VI), adsorption

中图分类号:

TQ174

朱明玉, 范德哲, 刘蓓, 刘舒雅, 方明, 谭小丽. C@K₂Ti₆O₁₃分级纳米材料对Cr(VI)的吸附去除[J]. 无机材料学报, 2020, 35(3): 309-314.

ZHU Mingyu, FAN Dezhe, LIU Bei, LIU Shuya, FANG Ming, TAN Xiaoli. C@K₂Ti₆O₁₃ Hierarchical Nano Materials: Effective Adsorption Removal of Cr(VI)[J]. Journal of Inorganic Materials, 2020, 35(3): 309-314.

图/表 7

图1 C@K2Ti6O13的(a) SEM照片, (b) TEM照片, (c) HETEM照片, (d) XRD图谱, (e) N2吸附-脱附等温线和(f)热重及其微分曲线

Fig. 1 (a) SEM image, (b) TEM image, (c) HRTEM image, (d) XRD pattern, (e) N2 adsorption-desorption isotherm and (f) TGA- DTG curves of C@K2Ti6O13 hierarchical nanostructures

图2 不同温度退火样品的傅里叶红外光谱图

Fig. 2 FT-IR spectra of the samples annealed at different temperatures

图3 pH和离子强度对Cr(VI)去除的影响

Fig. 3 Effect of pH and ionic strength on Cr(VI) adsorption

图4 (a) 反应时间对C@K2Ti6O13吸附去除Cr(VI)效果的影响及其(b)准二级动力学模型

Fig. 4 (a) Effect of contact time on Cr(VI) adsorption onto C@K2Ti6O13 HNMs and (b) corresponding fitting curve by the pseudo-second-order kinetic model

图5 Cr(VI)在C@K2Ti6O13上的(a)吸附等温线, (b)Langmuir模型的拟合, (c)Freundlich模型的拟合和(d)吸附热力学拟合曲线

Fig. 5 (a) Adsorption isotherms, (b) Langmuir isotherm model, (c) Freundlich isotherm model, and (d) plot of lnKd vs 1/T of the Cr(VI) on C@K2Ti6O13

表1 C@K2Ti6O13复合结构对Cr(VI)吸附的Freundlich和Langmuir等温吸附模型拟合相关参数

Table 1 Parameters simulated by Langmuir and Freundlich models of C@K2Ti6O13

T/K	Langmuir model			Freundlich model
T/K	q_m	b	R²	n	K_f	R²
298	37	0.056	0.97	2.7	2.2	0.97
313	37	0.052	0.95	2.7	2.2	0.93
328	29	0.066	0.94	3.2	2.2	0.89

表2 对Cr(VI)吸附的热力学参数

Table 2 Thermodynamic parameters for Cr(VI) adsorption

ΔH^θ /(kJ·mol^-1)	ΔS^θ /(kJ·K^-1·mol^-1)	ΔG^θ/(kJ·mol^-1)
ΔH^θ /(kJ·mol^-1)	ΔS^θ /(kJ·K^-1·mol^-1)	298 K	313 K	323 K
0.075	0.0124	-4.77	-4.74	-4.75

参考文献 27

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C@K₂Ti₆O₁₃分级纳米材料对Cr(VI)的吸附去除

C@K₂Ti₆O₁₃ Hierarchical Nano Materials: Effective Adsorption Removal of Cr(VI)

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