| Title | Utilization of e-wastes as a sustainable silica source in synthesis of ordered mesostructured titania nanocomposites with high adsorption and photoactivity |
|---|---|
| ID_Doc | 24069 |
| Authors | Liou, TH; Liu, SM; Chen, GW |
| Title | Utilization of e-wastes as a sustainable silica source in synthesis of ordered mesostructured titania nanocomposites with high adsorption and photoactivity |
| Year | 2022 |
| Published | Journal Of Environmental Chemical Engineering, 10, 2 |
| Abstract | The production of electronic waste (e-waste) is rapidly increasing globally. This waste is not effectively used at present. Moreover, few studies have investigated the synthesis of photocatalytic materials using materials recovered from e-waste. This paper reports the synthesis of a nanosized TiO2 catalyst supported on mesoporous Mobil Composition of Matter No. 41 (MCM-41). Sodium silicate precursor extracted from e-waste was used as a silicon source for the synthesis of an MCM-41 support. Transmission electron microscopy images revealed that TiO2 was successfully embedded in the pores of MCM-41. The particle size and crystalline structure of TiO2 was controlled by the mesostructured MCM-41 support. Nitrogen adsorption isotherms confirmed that TiO2/MCM-41 had uniform pore size (2.83 nm), a large pore volume (0.757 cm(3)/g), and high surface area (947 m(2)/g). The purity of TiO2/PRA-MCM-41 was as high as 99.90 wt%. The influences of TiO2 ratio, calcination temperature, and catalyst weight on the efficiency of methylene blue photodegradation were investigated. Different proportions of titanium species deposited on the MCM-41 surface resulted in the formation of differently sized TiO2 particles and strongly influenced the adsorption and photocatalytic activity. The TiO2/MCM-41 composite synthesized from e-waste had higher photocatalytic performance than TiO2/silica gel and pure TiO2. The composite catalyst had a combination of features that ensured high photocatalytic activity: small TiO2 particles, effective dispersion of TiO2 on the mesoporous silica, and high adsorptive efficiency. The proposed method, using an environmentally friendly approach, can reduce the accumulation of e-waste and produce highly valuable photocatalyst composites for environmental uses. |
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