Hybrid photoactive materials from municipal sewage sludge for the photocatalytic degradation of methylene blue

Abstract

To our knowledge this is the first manuscript describing a one step synthesis to produce an organic/inorganic hybrid material prepared by carbonization of municipal sewage sludge (AC RM ) that shows photoactivity for the photocatalytic degradation of methylene blue (MB). The hybrid material (AC RM ) exhibited a mesoporous texture while XRD and SEM-EDX showed Fe 2 O 3 and Fe 3 C crystallites. Photodegradation of MB was studied under two different lamps and results were compared against those obtained with a commercial TiO 2 . The photocatalytic tests showed that the hybrid material is photoactive and the binary composite TiO 2 -AC RM showed higher apparent first-order rate constants for the degradation of MB than those obtained on pure TiO 2 . A synergy effect between TiO 2 and AC RM was estimated at about 5 and 8 under lamps with UV-vis and almost pure visible light, respectively. It can be concluded that the photoactivity of TiO 2 -AC RM relative to neat TiO 2 was up to one order of magnitude higher, suggesting that iron phases in the hybrid material photo-assist the TiO 2 in the photodegradation of the methylene blue.

Synthesis and application of green mixed-metal oxide nano-composite materials from solid waste for dye degradation

“…1). Residue left at higher temperature is the weight of the ash bearing iron NCM (Matos et al, 2011;Zhuo et al, 2012). Thermogram of S(Fe-8) ( Fig.…”

“…Sludge sample was spread over glass plate and sun dried for 2e3 days time (in which its' mass became constant) (Matos et al, 2011). Thereafter, 5 g of the solid waste was taken in a silica crucible and calcined in a muffle furnace at different temperatures for 3 h. Scheme 1 shows the graphical representation of the preparation of iron oxide NCMs from EC solid waste.…”

“…Sewage sludge-based composite materials have been used as an adsorbent for adsorbing NO 2 (Pietrzak and Bandosz, 2008). Municipal sludge has also been used for biodiesel production (Matos et al, 2011). Iron oxide NCMs possessing meso-and micro-pores have received much attention in wastewater treatment (Eriksson et al, 2005).…”

“…from different solid wastes (Fan et al, 2008;Kargbo, 2010;Matos et al, 2011;Esparza et al, 2011;Zhuo et al, 2012). Sewage sludge-based composite materials have been used as an adsorbent for adsorbing NO 2 (Pietrzak and Bandosz, 2008).…”

Eco-Friendly Heterogeneous Photocatalysis on Biochar-Based Materials Under Solar Irradiation

“…Irradiation was provided with a metal halide lamp [18]. Photons flux was 1.44 9 10 17 photons cm -2 s -1 (90 % in the visible region).…”