Synthesis of an inorganic‐framework molecularly imprinted Fe‐doped TiO₂ composite and its selective photo‐Fenton‐like degradation of acid orange II

Abstract

BACKGROUND The heterogeneous photo‐Fenton‐like process is emerging as a promising treatment of dye‐containing wastewater because of its economic feasibility and high efficiency. However, it is still required to develop photo‐Fenton‐like catalysts with highly selective degradation ability and reusability. RESULTS Inorganic‐framework molecularly imprinted Fe‐doped TiO2 composites (MIP/Fe–TiO2) were successfully prepared by the sol–gel method, with acid orange II as the template and TiO2 as the matrix material. The photo‐Fenton‐like catalysts were characterized using FESEM, EDS, BET, X‐ray diffraction, FT‐IR spectroscopy and UV–vis diffuse reflectance spectroscopy. These methods revealed the well‐crystallized anatase phase and good nanometer‐level particle sizes. The adsorption property and photo‐Fenton‐like activity of the catalysts were also studied in single and binary systems, respectively. CONCLUSIONS Compared with non‐imprinted Fe–TiO2 composites (NIP/Fe–TiO2), MIP/Fe–TiO2 showed higher adsorption capacity and selectivity toward the template molecule. In addition, it was found that the molecular recognition ability of MIP/Fe–TiO2 provided the catalysts with rapidly selective photo‐Fenton‐like degradation of low target pollutant levels (20 mg L−1) in the presence of high levels of interferential pollutant sodium dodecyl benzene sulfonate (100 mg L−1). Moreover, because of the stable physicochemical properties of the inorganic framework, the new photo‐Fenton‐like catalysts were resistant to photochemical attack and showed favorable reusability. © 2017 Society of Chemical Industry

A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment

“…Another researcher developed a catalyst rGO-Fe3O4-TiO2 with a ratio of 1:1:2 and about 99% of dye was degraded in only 6 minutes [4]. Similarly, many scientists worked with the prepared catalyst by sol-gel method for degradation of dye like Rhodamine B and Cu-Embedded Alumina [21], acid orange-II and Fe-doped TiO2 [7], methylene blue dye and Ag-SiO2@-Fe2O3 [146], Orange G and TiO2/stainless steel mesh photo-electrode [147], methyl orange and TiO2/Fe3O4 [148]. Table 3 shows the brief literature survey of previous Table 4.…”

“…Elemental analysis (atomic % and weight %) can be obtained when SEM connected with Energy Dispersive X-ray spectroscopy (EDX). EDX is also known as EDS, can be used to show or map one compound to another as shown in Figure 15 [7]. Generally, the magnification of any material through SEM can be in the range of 10 5 -10 6 .…”

“…Many researchers are working on the treatment of wastewater generated from different industries like printing, dye [1], plastic, paint [2], textile [3], food, leather [4], petroleum [5], paper [6], cosmetics [7], distilleries [8], steel, rice mill, fractory nature [28][29][30]. For the treatment of generated wastewater, various conventional and non-conventional methods like coagulation method [31], biological method [32], ion exchange method have been used, but among these methods, advanced oxidation technology (AOTs) is very effective comparatively [16,33].…”

“…The red color showing iron (a) and yellow color showing is Titanium (b). Red color distributed over Titanium (c)[7].Figure dand e illustrate the morphology of catalyst (Fe/TiO2) synthesized by wet impregnation and hydrothermal method respectively with 50×10 3 magnification (Reprinted with permission from Ref [7]. copyright from Elsevier).…”

Synthesis and Applications of Molecularly Imprinted Polymers Modified TiO2 Nanomaterials: A Review

“…According to Li et al [44], SMIT combined with sol-gel process was applied to synthesis a new Pb(II)-imprinted polymer with nano-TiO 2 as a solid substrate, glycidoxy propyltrimethoxysilane (GPTMS) as both a crosslink and a silane coupling agent. Song et al [45] prepared the new molecularly imprinted inorganic-framework Fe–TiO 2 composites (MIPs/Fe–TiO 2 ) based on the sol-gel method with acid orange II (AOII) as the template molecule and TiO 2 as the matrix material. Liu [46] used nnthracene-9-carboxylic acid as the imprinting molecular to construct a novel molecularly imprinted TiO 2 thin film modified TiO 2 nanotube array photocatalyst by the sol-gel method.…”