Hydrothermal Preparation and Adsorption Property of MoS2/Na2Fe2Ti6O16†

doi:10.7503/cjcu20180040

Abstract

Abstract:

Novel nanocomposites of MoS₂/Na₂Fe₂Ti₆O₁₆(MoS₂/NFTO) with different ratios were synthesized by a simple hydrothermal method in this paper. The crystal structure, morphology, chemical composition, specific surface area, pore distribution and zeta potential of the composites were analyzed. In addition, we studied the adsorption behaviour and adsorption kinetics of the composites. The results showed that the adsorption capacity per specific surface area of 70%MoS₂/NFTO composite is 58 times higher than that of the pure Na₂Fe₂Ti₆O₁₆, and the adsorption ratio increases 4.9 times. The adsorption kinetics meets the pseudo-second-order kinetics model.

Key words: MoS₂/Na₂Fe₂Ti₆O₁₆ nanocomposites, Adsorption property, Hydrothermal method

CLC Number:

O611.3

TrendMD:

KANG Yuanyuan, GUO Zeqing, ZHOU Jianping. Hydrothermal Preparation and Adsorption Property of MoS₂/Na₂Fe₂Ti₆O₁₆†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1364.

Figures/Tables 7

Fig.1 XRD patterns of MoS2/NFTO samples with different composite ratios^ w(MoS2): a. 0; b. 10%; c. 30%; d. 50%;^ e: 70%; f: 80%; g: 90%; h: 100%.

Fig.2 SEM images of MoS2/NFTO samples with different composite ratios^w(MoS2): (A) 0; (B) 10%; (C) 30%; (D) 50%; (E) 70%; (F) 80%; (G) 90%; (H) pure MoS2.

Fig.3 Adsorption capacity(A), adsorption rate(B) and adsorption kinetic curves(C) of MoS2/NFTO samples with different composite ratios^ w(MoS2): a. 0; b. 10%; c. 30%; d. 50%; e: 70%; f: 80%; g: 90%.

Fig.4 N2 adsorption-desorption isotherms of pure NFTO(A), 70%MoS2/NFTO(B) and 90%MoS2/NFTO(C) composites^ The insets show the pore size distribution of the corresponding samples.

Table 1 BET analysis, organic dye MB removal on adsorbents and zeta potential at pH=7

Sample	Surface area/ (m²·g^-1)	MB removal after 180 min(%)	Q/(mg·g^-1)	Q_BET/(mg·m^-2)	Adsorption rate contant, k/min^-1	Zeta potential/mV
NFTO	52.46	10.689	9.42	0.18	0.0001	-16.05
70%MoS₂/NFTO	4.55	63.196	48.55	10.68	0.0014	-8.94
90%MoS₂/NFTO	10.09	50.505	39.03	3.87	0.0028	-12.75

Fig.5 Adsorption kinetics of MB adsorbed by the MoS2 nanosheets^ (A) Pseudo-first-order model; (B) pseudo-second-order model.

Table 2 Pseudo-first-order and pseudo-second-order kinetic parameters of MB adsorption on nanocomposites

Sample	Experimental q_e/(mg·g^-1)	Pseudo-first-order, ln(q_e-q_t)=lnq_e-k₁t			Pseudo-second-order, t/q_t=1/(k₂ $q e 2$ )+t/q_e
Sample	Experimental q_e/(mg·g^-1)	q_e/(mg·g^-1)	k₁/min^-1	R²	q_e/(mg·g^-1)	k₂/(g·mg^-1·min)	R²
Pure NFTO	9.422	4.660	0.008	0.507	8.811	0.012	0.959
10%MoS₂/NFTO	14.057	6.418	0.010	0.598	13.353	0.011	0.983
30%MoS₂/NFTO	24.452	8.197	0.014	0.584	24.027	0.011	0.995
50%MoS₂/NFTO	49.514	23.601	0.017	0.842	49.213	0.004	0.996
70%MoS₂/NFTO	48.553	16.390	0.016	0.655	47.916	0.007	0.997
80%MoS₂/NFTO	47.775	31.987	0.025	0.968	48.638	0.003	0.996
90%MoS₂/NFTO	39.034	30.981	0.020	0.945	48.638	0.003	0.996

Table 2 Pseudo-first-order and pseudo-second-order kinetic parameters of MB adsorption on nanocomposites

Sample	Experimental q_e/(mg·g^-1)	Pseudo-first-order, ln(q_e-q_t)=lnq_e-k₁t			Pseudo-second-order, t/q_t=1/(k₂ $q e 2$ )+t/q_e
Sample	Experimental q_e/(mg·g^-1)	q_e/(mg·g^-1)	k₁/min^-1	R²	q_e/(mg·g^-1)	k₂/(g·mg^-1·min)	R²
Pure NFTO	9.422	4.660	0.008	0.507	8.811	0.012	0.959
10%MoS₂/NFTO	14.057	6.418	0.010	0.598	13.353	0.011	0.983
30%MoS₂/NFTO	24.452	8.197	0.014	0.584	24.027	0.011	0.995
50%MoS₂/NFTO	49.514	23.601	0.017	0.842	49.213	0.004	0.996
70%MoS₂/NFTO	48.553	16.390	0.016	0.655	47.916	0.007	0.997
80%MoS₂/NFTO	47.775	31.987	0.025	0.968	48.638	0.003	0.996
90%MoS₂/NFTO	39.034	30.981	0.020	0.945	48.638	0.003	0.996

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Hydrothermal Preparation and Adsorption Property of MoS₂/Na₂Fe₂Ti₆O₁₆†

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