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A platform for research: civil engineering, architecture and urbanism
TiO2/montmorillonite nanocomposite for removal of organic pollutant
Abstract In order to improve the adsorption and photocatalytic performance of TiO2 modified clay composite, a new method of immobilization of nano-scaled TiO2 on the layer surface of montmorillonite (MT) clay was designed and carried out in two steps in this work. The first step was to prepare a nano-scaled TiO2 dispersion by a hydrothermal method with the addition of organic dispersant into an aqueous solution of TiCl4; and then the assemblies of nano-scaled TiO2 with CTAB (cetyltrimethylammonium bromide) were applied to regulate the process of immobilization of nano-scaled TiO2 on the layer surface of MT clay. The results indicated that well pre-dispersed nano-TiO2 was obtained with the application of diethanolamine (DEA) as a dispersant, which could interact with CTAB to form assemblies of nano-scaled TiO2 particles and CTAB molecules (CTAB–DEA–TiO2), and then became self-anchored on the layer surface of MT clay to produce well-distributed TiO2/MT nanocomposites. After calcination at 500°C, the modified composites showed much higher values for specific surface area, average pore size and pore volume than the raw MT clay. The adsorption and photocatalytic performance of the composite TCM-500 was evaluated by using methyl orange (MO). The comparative photocatalytic degradation of MO indicated that the composite gave 10% higher photocatalytic efficiency than P25 due to its optimal structural conformation tailored by surfactant assembly. Therefore, the new method of immobilization of pre-dispersed nano-scaled TiO2 assembly with a surfactant was a good alternative to prepare a TiO2/MT nanocomposite and was effective to improve its adsorption capacity and photocatalytic performance.
Research highlights ► A new method of modification of clay was developed with an immobilization of nano-TiO2 on the surface of clay layer rather than intercalation of nano-TiO2 within the interlayers of clay. ► The assembly of surfactant in aqueous solution was used to regulate the size and morphology of nano-TiO2 particle and the process of immobilization of nano-TiO2 on the surface of clay layer. ► The TiO2/MT (montmorrilonite) nanocomposite presents higher adsorption and photocatalytic performance by more than 10 percent compared with the commercial P25 TiO2 product due to the improvement of the BET surface area, pore size and pore volume. ► This new method of immobilization of nano-TiO2 on the layer surface of MT clay is expected to overcome the basic space limitation of the interlayer of MT clay and increase the number of alternatives for preparation of TiO2/MT functional clay composites.
TiO2/montmorillonite nanocomposite for removal of organic pollutant
Abstract In order to improve the adsorption and photocatalytic performance of TiO2 modified clay composite, a new method of immobilization of nano-scaled TiO2 on the layer surface of montmorillonite (MT) clay was designed and carried out in two steps in this work. The first step was to prepare a nano-scaled TiO2 dispersion by a hydrothermal method with the addition of organic dispersant into an aqueous solution of TiCl4; and then the assemblies of nano-scaled TiO2 with CTAB (cetyltrimethylammonium bromide) were applied to regulate the process of immobilization of nano-scaled TiO2 on the layer surface of MT clay. The results indicated that well pre-dispersed nano-TiO2 was obtained with the application of diethanolamine (DEA) as a dispersant, which could interact with CTAB to form assemblies of nano-scaled TiO2 particles and CTAB molecules (CTAB–DEA–TiO2), and then became self-anchored on the layer surface of MT clay to produce well-distributed TiO2/MT nanocomposites. After calcination at 500°C, the modified composites showed much higher values for specific surface area, average pore size and pore volume than the raw MT clay. The adsorption and photocatalytic performance of the composite TCM-500 was evaluated by using methyl orange (MO). The comparative photocatalytic degradation of MO indicated that the composite gave 10% higher photocatalytic efficiency than P25 due to its optimal structural conformation tailored by surfactant assembly. Therefore, the new method of immobilization of pre-dispersed nano-scaled TiO2 assembly with a surfactant was a good alternative to prepare a TiO2/MT nanocomposite and was effective to improve its adsorption capacity and photocatalytic performance.
Research highlights ► A new method of modification of clay was developed with an immobilization of nano-TiO2 on the surface of clay layer rather than intercalation of nano-TiO2 within the interlayers of clay. ► The assembly of surfactant in aqueous solution was used to regulate the size and morphology of nano-TiO2 particle and the process of immobilization of nano-TiO2 on the surface of clay layer. ► The TiO2/MT (montmorrilonite) nanocomposite presents higher adsorption and photocatalytic performance by more than 10 percent compared with the commercial P25 TiO2 product due to the improvement of the BET surface area, pore size and pore volume. ► This new method of immobilization of nano-TiO2 on the layer surface of MT clay is expected to overcome the basic space limitation of the interlayer of MT clay and increase the number of alternatives for preparation of TiO2/MT functional clay composites.
TiO2/montmorillonite nanocomposite for removal of organic pollutant
Yuan, Lingling (author) / Huang, Dandan (author) / Guo, Weinan (author) / Yang, Qiuxin (author) / Yu, Jiang (author)
Applied Clay Science ; 53 ; 272-278
2011-03-23
7 pages
Article (Journal)
Electronic Resource
English
TiO2/montmorillonite nanocomposite for removal of organic pollutant
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