High Efficiency Synthesis of FeY Type Zeolite and Its Heterogeneous Fenton Catalytic Degradation†

doi:10.7503/cjcu20180178

Abstract

Abstract:

Iron containing zeolite with FAU structure was synthesized via the wet-gel crystallization method to improve the traditional hydrothermal synthesis of zeolites. X-ray diffraction(XRD), scanning electron microscopy(SEM), Ultraviolet-visible(UV-Vis) spectroscopy, inductively coapled plasma(ICP) elemental analysis and X-ray photoelectron spectrometry(XPS) spectroscopy were used to study the structure, morphology and composition of the zeolites, which was compared with those of samples prepared by traditional hydrothermal synthetic method and direct ion exchanging method. FeY zeolites were employed into heterogeneous catalytic system based on Fenton reaction, which had good catalytic degradation performance against methylene blue. The effects on the degradation rate were evaluated, including initial pH value of solution, initial concentration of H₂O₂, dosage of catalyst as well as different preparation methods. The optimum operation parameters for the Fenton oxidation were determined. Stabilities of the catalysts were also studied by successive recycling experiments.

Key words: Wet gel crystallization, Zeolite Y, Hetergeoneous Fenton reaction, Catalytic degradation

CLC Number:

O643
O614

TrendMD:

ZHANG Wu,JI Yanyan,PENG Han,DAI Shaoying,LIU Ying,ZHANG Jimei,WANG Dongmei. High Efficiency Synthesis of FeY Type Zeolite and Its Heterogeneous Fenton Catalytic Degradation^†[J]. Chem. J. Chinese Universities, 2018, 39(9): 1985.

Figures/Tables 12

Fig.1 XRD patterns of NaY-WG(a), FeY-WG(b), FeY-HY(c) and FeY-IE(d)

Fig.2 SEM images of FAU zeolites synthesized through different routes (A) NaY-WG; (B) FeY-WG; (C) FeY-HT; (D) FeY-IE.

Fig.3 UV-Vis adsorption spectra of FeY-HT(a), FeY-WG(b) and FeY-IE(c)

Table 1 Elemental analysis data of FeY zeolites synthesized via different routes

Sample	Elemental content/(mg·L^-1)			Molar ratio
Sample	Al	Si	Fe	Si/Al	Fe/Si
FeY-WG	12.29	39.43	6.63	3.09	0.084
FeY-HT	14.52	42.90	7.05	2.85	0.082
FeY-IE	14.18	42.49	6.54	2.90	0.077

Fig.4 XPS spectra of Fe2p in FeY-WG(a), FeY-HT(b) and FeY-IE(c)

Fig.5 Effect of pH value on the decolorization of MBpH: a. 2.0; b. 2.5; c. 3.0; d. 3.5. Reaction conditions: initial concentration of MB: 50 mg/L; initial concentration of H2O2: 0.016 mol/L; catalyst dosage: 0.5 g/L; temperature: 25 ℃.

Fig.6 Effect of initial concentration of H2O2 on the decolorization of MBInitial concentration of H2O2/(mol·L-1): a. 0; b. 0.098; c. 0.196; d. 0.294; e. 0.392. Reaction conditions: initial concentration of MB: 50 mg/L; catalyst dosage: 1.0 g/L; temperature: 25 ℃; pH=2.5.

Fig.7 Effect of catalyst FeY-WG dosage on the decolorization of MBFeY-WG dosage/(g·L-1): a. 0; b. 0.5; c. 1.0; d. 2.0; e. 4.0. Reaction conditions: initial concentration of MB: 50 mg/L; initial concentration of H2O2: 0.294 mol/L; temperature: 25 ℃; pH=2.5.

Fig.8 Kinetic curves of decolorization efficiency on catalysts FeY-WG(a), FeY-IE(b), FeY-HT(c) and NaY-WG(d)Reaction conditions: initial concentration of MB: 50 mg/L; initial concentration of H2O2: 0.294 mol/L; catalyst dosage: 1.0 g/L, temperature: 25 ℃; pH=2.5.

Fig.9 EPR spectrum of DMPO hydroxyl adducts obtained from a solution of DMPO, FeY-WG and H2O2

Fig.10 Successive recycling experiments of FeY-WG(A) and FeY-IE(B) for decolorization of MBReaction conditions: initial concentration of MB: 50 mg/L; initial concentration of H2O2: 0.294 mol/L; catalyst dosage: 1.0 g/L; temperature: 25 ℃; pH=2.5.

Fig.11 Decolorization profiles of FeY-WG for different dyesa. Methyl violet; b. xylenol Orange; c. azure Ⅰ; d. bromophenol blue.

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