Promoting effect of adding carbon black to TiO2 for aqueous photocatalytic degradation of methyl orange

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

“…However, catalysts TiO2/CB [45] and CNT/Fe-Ni/TiO2 [46] presented degradations of C/C0 = 0.12 (MO) and 0.10 (MB), respectively.…”

Photocatalytic degradation of phenol by char/N-TiO 2 and char/N-F-TiO 2 composite photocatalysts

“…The photocatalytic removal of phenol by ACT 0.5/2, ACT 0.2/2 was 18% and 22%, respectively. Low removal percentages have also been reported by Mao et al [12] during the photocatalytic degradation of methyl orange using TiO 2 /activated carbon composite catalysts. This phenomenon can be justified as follows: (i) the presence of micropores in the activated carbonaceous materials limited the diffusion of the adsorbed pollutant's molecules toward the surface of TiO 2 and KOH-activated carbons possess extensive microporosity [39]; (ii) activated carbonaceous materials can prevent incident photons from reaching internalised TiO 2 , and consequently reduce the frequency of photoexcitation (shielding effect) resulting in slower production of the photogenerated pair hole/electron; (iii) part of the TiO 2 was deposited in the micropores of activated carbonaceous materials and as a result a less amount of TiO 2 is located on the exterior and illuminated surface of composite catalysts [12], and (iv) the accumulation of degradation intermediates by oxidative coupling reactions in the micropores and mesopore surface of the photocatalysts that induced a poisoning of the photocatalysts.…”

“…The low crystal size values observed in the present study are consistent with previous studies reporting that doping of TiO 2 with non-metals such as N, F, I [2,7,[24][25][26] affects the crystallite size growth of TiO 2 leading to smaller crystallite size. In addition, the presence of carbonaceous surfaces in composite TiO 2 catalysts was found to inhibit also the crystallite growth and/or suppress TiO 2 aggregation [13,27].…”

“…Activated carbon (AC), carbon black and carbon nanotubes are among the most commonly used TiO 2 supports [12][13][14][15]. More recently, we have reported the utilization of pyrolytic char (PC) from tire-rubber as an efficient TiO 2 support with promising results [13].…”

Catalytic photodegradation of dyes by in situ zeolite-supported titania

“…Dyes represent a serious danger for the aquatic environment. Several approaches have been employed for the treatment of waste water containing dyes, such as removal by biosorption [1], adsorption [2], electrocoagulation [3,4], ultracentrifugation [5] and photodecomposition [6,7]. The latter has been widely investigated, especially using titania as the catalyst.…”