Adsorption and photocatalytic degradation performances of methyl orange-imprinted polysiloxane particles using TiO<sub>2</sub> as matrix

doi:10.1007/s11706-024-0693-9

2024, Vol. 18

Issue (3) : 240693 https://doi.org/10.1007/s11706-024-0693-9

Adsorption and photocatalytic degradation performances of methyl orange-imprinted polysiloxane particles using TiO₂ as matrix

Wenshuang Wang¹, Xingya Pan¹, Xinxin Zhang^1,², Minglin Wang¹, Zijia Wang¹, Lingzhi Feng¹, Xiaolei Wang¹, Kongyin Zhao¹(

)

¹. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
². Shandong Sinocera Functional Materials Co., Ltd., Dongying 257091, China

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Abstract

Combining molecular imprinting technique with titanium dioxide (TiO₂) photocatalysis technique can improve the degradation ability and selectivity of TiO₂ nanoparticles towards pollutants. In this work, methyl orange-imprinted polysiloxane particles (MIPs) were synthesized using TiO₂ as matrix and silane as functional monomers. The adsorption capacity (Q_e) of MIPs was 20.48 mg·g⁻¹, while the imprinting efficiency (IE) was 3.4. Such MIPs exhibited stable imprinting efficiencies and adsorption efficiencies towards methyl orange (MO) in the multi-cycle stability test. Photocatalytic degradation performances of both MIPs and non-imprinted polysiloxane particles (NIPs) were investigated. Compared with NIPs, MIPs exhibited better photocatalytic degradation performance towards MO, with the degradation efficiency of 98.8% in 12 min and the apparent rate constant (K_obs) of 0.077 min⁻¹. The interaction between silane and MO was also studied through molecular dynamics simulation. This work provides new insights into the use of silane for the synthesis of MIPs as well as the molecular imprinting technique for applications in the field of TiO₂ photocatalysis.

Keywords titanium dioxide molecular imprinting adsorption photocatalytic degradation

Corresponding Author(s): Kongyin Zhao

Issue Date: 10 September 2024

Cite this article:

Kongyin Zhao,Xiaolei Wang,Lingzhi Feng, et al. Adsorption and photocatalytic degradation performances of methyl orange-imprinted polysiloxane particles using TiO₂ as matrix[J]. Front. Mater. Sci., 2024, 18(3): 240693.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-024-0693-9
https://academic.hep.com.cn/foms/EN/Y2024/V18/I3/240693

Scheme1 Schematic diagrams of (a) the synthesis of MIPs and (b) the molecular imprinting principle.

Fig.1 Characterizations of MIPs using TiO₂ as matrix: TEM images of (a) TiO₂ and (b) MIPs; SEM images of (c) TiO₂ and (d) MIPs; (e) Elemental analysis results of MIPs. (f) FTIR spectra of TiO₂, KH550-MIPs, KH570-MIPs, and MIPs. Particle size distributions of (g) TiO₂ and (h) MIPs in water.

Fig.2 (a) Variations of Q_t for both MIPs and NIPs as well as variation of IE with the total volume of (KH550 + KH570) in preparation. (b) Variations of Q_t for both MIPs and NIPs as well as variation of IE with the concentration of MO in preparation.

Fig.3 (a) Relationships between c_o and Q_e and (b) relationships between c_e and Q_e for MIPs and NIPs (experimental conditions: m = 0.10 g, temperature = 25 °C, adsorption time = 12 h). (c) Adsorption kinetics curves for MIPs and NIPs as well as variation of IE with time (experimental conditions: c_o = 0.5 mmol·L^?1, m = 0.10 g, temperature = 25 °C).

Tab.1 Molecule recognitions of MO-MIPs and MR-MIPs

Fig.4 (a) Q_e, (b) K_D, and (c) reusability of MIPs and NIPs after five cycles of selective adsorption (experimental conditions: c(MO) = 0.5 mmol·L^?1, m = 0.10 g, temperature = 25 °C, time = 12 h).

Fig.5 (a) Photocatalytic degradation curves and (b) corresponding reaction rate constants of MO using MIPs and NIPs. (c) Selective photocatalytic degradation curves and (d) corresponding reaction rate constants of both MO and MR using MIPs. Experimental conditions: c(MO) = 0.5 mmol·L^?1, m(MIP) = 0.10 g, temperature = 25 °C, time = 12 h.

Fig.6 Reusability of MIPs in photocatalytic degradation.

Fig.7 Molecular structures and reaction results of MO + KH550, MO + KH570, and MO + (KH550 + KH570).

Fig.8 Variations of the number of hydrogen bonds with time for (a) MO + KH550, (b) MO + KH570, and (c) MO + (KH550 + KH570).

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