Titania modified activated carbon prepared from sugarcane bagasse: adsorption and photocatalytic degradation of methylene blue under visible light irradiation

Abstract

Activated carbon (AC), prepared from sugarcane bagasse waste through a low-temperature chemical carbonization treatment, was used as a support for nano-TiO. TiO supported on AC (xTiO-AC) catalysts (x = 10, 20, 50, and 70 wt.%) were prepared through a mechano-mixing method. The photocatalysts were characterized by Raman, X-ray diffraction analysis, FTIR, S, field emission scanning electron microscope, and optical technique. The adsorption and photo-activity of the prepared catalysts (xTiO-AC) were evaluated using methylene blue (MB) dye. The photocatalytic degradation of MB was evaluated under UVC irradiation and visible light. The degradation percentage of the 100 ppm MB at neutral pH using 20TiO-AC reaches 96 and 91 after 180 min under visible light and UV irradiation, respectively. In other words, these catalysts are more active under visible light than under UV light irradiation, opening the possibility of using solar light for this application.

Preparation of TiO2 supported on MDF biochar for simultaneous removal of methylene blue by adsorption and photocatalysis

“…In this sense, previous studies focused on the immobilization of titanium dioxide (TiO 2 ) onto a precursor like biochar, thus in the literature different biochars such as walnut shell, 7 reed straw, 8 coconut shell, 9 corn cob, 10 Salvinia molesta, 11 activated carbon-TiO 2 , olive pits-TiO 2 and wood shaving-TiO 2 , 12 ramie bars, 13 softwood pellets and miscanthus straw pellets, 14 sugarcane bagasse, 15 and bamboo 16 have been used. In fact, TiO 2 /walnut shell was capable to discolor 96% and mineralize 83% of a 20 mg L −1 methyl orange solution in 150 min.…”

Reforming of Rice Ash Waste by Incorporated Nanotitania in Silica Framework for Photo‐catalytic Treatment of Wastewater

“…The photo-catalytic nanocomposite samples, namely, RSA-TiO 2 (x), RSA-CuPc and RSA-TiO 2 (50)-CuPc, were prepared to apply the mechano-mixing method. [24] A requisite amount of RSA was mixed with TiO 2 in a ratio (x) maintained at 10, 20, 50 and 70 wt% and ground thoroughly in a mortar. After complete grinding, the mixture was dried at 110 C and calcined in air at 250 C for 2 hr.…”

“…On the other hand, a lower intensity indicates that more excited electrons are trapped and transferred gradually through the interface. [24] The room-temperature photoluminescence spectra of the prepared photo-catalysts; under excitation at the wavelength of 254 nm and 400 nm corresponding to UV irradiation and visible light, respectively ( Figure 5). In general, the rate of e − /h + recombination increased under UV excitation due to high PL spectrum intensity (i.e.)…”

Síntese E Caracterização De Compósitos De Dióxido De Titânio E Semente De Manga Para Fotocatálise / Synthesis and Characterization of Titanium Dioxide and Mango Seed Composites for Heterogenous Photocatalysis

“…A fotocatálise heterogênea vem sendo objeto de diversas pesquisas na área de tratamento de efluentes como corantes têxteis, fármacos hospitalares, entre outros (Subtil, et al, 2020;Wu, Wang e Yi, 2018;Perini, et al, 2018;Karaolia et al, 2018). Nos processos fotocatalíticos semicondutores inorgânicos como, trióxido de tungstênio (WO3), sulfeto de zinco (ZnS) e óxido de ferro III Fe2O3são bastante empregados, mas o dióxido de titânio (TiO2) destaca-se como sendo um dos fotocatalisadores mais aplicados devido a sua estabilidade física, química e biológica, baixo custo, baixíssima toxicidade além de apresentar alta atividade fotocatalítica (EL-SALAMONY et al, 2017).…”

“…Nesse processo pode ser obtido um novo material, caracterizado como compósito, apresentando propriedades que não são encontradas nos materiais constituintes individualmente (GIBSON, 1994). Nessa perspectiva, trabalhos como o de El-Salamony et al (2017) apresentaram bons resultados na fotocatálise do azul de metileno, sob luz visível, com o emprego de nanocompósitos de dióxido de titânio e carvão ativado preparado a partir do bagaço de cana-de-açúcar. No entanto, as etapas de preparação deste material são complexas e não se investigou a separação entre as partículas do mesmo e a solução, ao final do processo, comparado ao dióxido de titânio comercial.…”