Thiohydroxy-functionalized Mesoporous Materials: Preparation and its Adsorption to Cr6+

doi:10.15541/jim20190103

Abstract

Abstract:

Chromium ion accumulation in environment is a health hazard to human being. A thiohydroxy-functionalized mesoporous material SBA-15-SH as adsorbent was prepared by the hydrothermal polycondensation method in this study. When 3-mercaptopropyltrimethoxysilane was used as the silicon source, SBA-15 was successfully modified with the thiohydroxy group confirmed by FTIR. This designed mesoporous material was rod-like with regular and well-defined channel systems of 7 nm. The adsorption capacity of SBA-15-SH to Cr ⁶⁺ was affected by the adsorption temperature, Cr ⁶⁺ solution pH and its initial concentration together with the adsorbent dosage. The adsorption equilibrium was reached in 10 min which obeyed the Langmuir adsorption equation and the pseudo second-order kinetic mode. The maximum adsorption capacity of SBA-15-SH to Cr ⁶⁺ was 6.85 mg/g when the Cr ⁶⁺ solution pH and adsorption temperature was controlled at 4.0 and 25-45 ℃, respectively. This functionalized mesoporous material was successfully applied in spiked tap-water and industrial waste water, and the recovery rate can reach 95%-105%.

Key words: mesoporous materials, thiohydroxy-functionalized, Cr⁶⁺, adsorption performance

CLC Number:

O647

CHENG Fu-Qiang,JI Tian-Tian,XUE Min,MENG Zi-Hui,WU Yu-Kai. Thiohydroxy-functionalized Mesoporous Materials: Preparation and its Adsorption to Cr⁶⁺[J]. Journal of Inorganic Materials, 2020, 35(2): 193-198.

Figures/Tables 11

Fig.1 Morphologies of SBA-15 and thiohydroxy-functionalized mesoporous material SBA-15-SH (a) SEM image and (b) TEM image of SBA-15; (c) SEM image and (d) TEM image of SBA-15-SH

Fig. 2 FT-IR spectra of the as-prepared mesoporous materials

Fig. 3 Effect of solution pH on Cr6+ adsorption by SBA-15-SH

Fig. 4 Effect of environment temperature on Cr6+ adsorption by SBA-15-SH

Fig. 5 Adsorption kinetic study of SBA-15/SBA-15-SH on Cr6+ adsorption

Table 1 Adsorption kinetics fitting results

Adsorption equation	k	q_e/(mg·g^-1)	R²
Lagergren first order equation $In(q_{e}- q_{1})= Inq_{e}-kt$	0.351	5.737	0.9662
Lagergren second order equation $\frac{t}{q_{t}}=\frac {1}{kq^{2}_{e}}+\frac {t}{q_{e}}$	1.44×10^-4	6.930	0.9950

Fig. 6 Effect of the initial concentration of Cr6+ on its adsorption

Table 2 Isothermal adsorption data fitting

Isothermal model	K	q_m	1/n	R²
Langmuir $\frac{c_{e}}{q_{e}}=\frac{c_{e}}{q_{m}}+\frac{1}{Kq_{m}}$	2.89	6.86	-	0.9899
Freundlich $Inq_{e}= InK_{F}+\frac{Inc_{e}}{n}$	-	-	1.849	0.7494

Fig. 7 Effect of adsorbent dosage on Cr6+ adsorption

Fig. 8 Chelation mechanism of sulfhydryl group and heavy metal ions

Table 3 Determination of Cr6+ in spiked real water sample

Sample	Added/(mg·L^-1)	Found/(mg·L^-1)	Recovery /%
Tap water	0	0.01	-
	0.2	0.20	95
	0.5	0.50	98
	1.0	0.97	96
Industry waste water	0	0.20	-
	0.2	0.41	105
	0.5	0.68	96
	1.0	1.21	101

References 20

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Thiohydroxy-functionalized Mesoporous Materials: Preparation and its Adsorption to Cr⁶⁺

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