Adsorption of Iodine by ZIF Materials

doi:10.15541/jim20190351

Abstract

Abstract:

Radioactive iodine present in nuclear waste water streams is harmful to human health and environment. Since iodine will exist in multiple states in water, accurate quantification of the total iodine content in any given sample is very difficult. The development of a method for determining the total iodine content accurately in water, and finding materials which can effectively remove the iodine are of particular importance. Here, a method was proposed for determining the concentration of iodine by cyclohexane extraction. And two kinds of zeolite imidazole skeleton materials ZIF-8 and ZIF-67 were prepared to be used as adsorbents to effectively adsorb iodine from an aqueous environment. Samples ZIF-8 and ZIF-67 were characterized by different methods. The results show that these two kinds of materials have good chemical structure and large specific surface area. The results of adsorption kinetics experiments show that the adsorption of ZIF-8 and ZIF-67 materials to iodine can reach the equilibrium within 60 min. The iodine adsorption behaviors of both materials are fitted with the pseudo second-order kinetic model. Their adsorption thermodynamics indicate linear adsorption behavior for iodine in the case of both zeolites. Adsorption capacities of ZIF-8 and ZIF-67 for iodine could reach as high as 2000 mg·g ^-1.

Key words: ZIF-8, ZIF-67, iodine, aqueous solution, adsorption

CLC Number:

TQ174

LIU Rong, ZHANG Wei, CHEN Yuantao, FAN Yuanrui, HU Guangzhang, XU Cheng, HAN Zheng. Adsorption of Iodine by ZIF Materials[J]. Journal of Inorganic Materials, 2020, 35(3): 345-351.

Figures/Tables 11

Fig. 1 Standard curve of iodine-cyclohexane after extraction of iodine from water with cyclohexane

Fig. 2 Simulated and experimental XRD patterns of ZIF-8 and ZIF-67

Fig. 3 SEM images of ZIF-8 and ZIF-67 before and after iodine adsorption (a) ZIF-8 before adsorption, (b) ZIF-8 after adsorption, (c) ZIF-67 before adsorption, (d) ZIF-67 after adsorption

Fig. 4 Mapping images and EDS patterns of ZIF-8 and ZIF-67 (a) Mapping image of ZIF-8 after adsorption iodine; (b) Mapping image of ZIF-67 after adsorption iodine; (c) EDS pattern of ZIF-8 after adsorption iodine; (d) EDS pattern of ZIF-67 after adsorption iodine

Fig. 5 TGA curves of ZIF-8 (a) and ZIF-67 (b)

Fig. 6 Nitrogen adsorption and desorption curves of ZIF-8 (a) and ZIF-67 (b)

Fig. 7 ZIF-8 (a) and ZIF-67 (b) adsorption capacity dependences of the initial concentration of the solution

Table 1 Langmuir and Freundlich parameters for adsorption of iodine by ZIF-8 and ZIF-67

		ZIF-8	ZIF-67
Langmuir equation	Q_m/(mg·g^-1)	64416.71	77747.64
	k_L/(L·mg^-1)	1.59×10^-4	1.30×10^-4
	R²	0.99	0.99
Freundlich equation	k_F/(mg·g^-1)	10.00	10.84
	n	1.00	0.98
	R²	1.00	0.99

Fig. 8 Iodine adsorption capacity dependence of the adsorption time by ZIF-8 and ZIF-67

Table 2 Pseudo first and pseudo second order kinetics parameters for the adsorption of iodine by ZIF-8 and ZIF-67

		ZIF-8	ZIF-67
Psedo-first-order kinetics equation	Q_e/(mg·g^-1)	1010.54	1047.37
	k₁/(L·mg^-1)	1.30×10^-4	1.49×10^-4
	R²	0.97	0.93
Psedo-second-order kinetics equation	Q_e/(mg·g^-1)	947.61	916.08
	k₂/(g·min^-1·mg^-1)	0.08	0.12
	R²	0.99	0.96

Fig. 9 Adsorption mechanism of iodine on ZIF-8 and ZIF-67

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