Optical Photocatalytic Degradation of Methylene Blue Using Lignocellulose Modified TiO<sub>2</sub>

Abstract

This paper reports the photo-catalytic activity and stability of Lignocellulose/TiO 2 nanoparticles (NPs) was evaluated through using the decomposition of methylene blue (MB) as a testing model reaction under visible light irradiation (λ max > 420nm). The modified (NPs) (pH = 6.94 -6.97) photocatalyst material was dried for 24 hours at the temperature of 80°C and calcinated at 400°C for 2 hours through constant air flow. The degradation of MB was performed using 250 Watt xenon lamp within every 30 minute time interval followed by measuring the absorbance. The maximum characterstic absorption peak of MB solution was observed at (λ max ~ 664nm) and the absorbance of this peak approaches to a minimum value and the degradation efficiency become effective after illumination for 150 minute. Optimized parametric conditions like pH ≈ 6, initial concentration (C o = 6 ppm), time = 120 min and catalyst loading (160 mg) results were examined to improve the degradation efficiency (> 95%).

Immobilization of TiO2 Semiconductor Nanoparticles onto Posidonia Oceanica Fibers for Photocatalytic Phenol Degradation

“…The photodegradation efficiency after 4 h irradiation time under UV-C light was increased from 27% at 0.2 g/L to 62%, which was the maximum. The decrease in efficiency was observed due to an increase in the amount of catalyst and low light penetration into the dispersion that was also reported in recent studies [22].…”

“…In lab-scale, the photocatalytic pollutant degradation is carried out with suspended TiO 2 photocatalysts, but TiO 2 tends to agglomerate, whereby agglomeration depends on TiO 2 concentration and water quality [13]. To avoid the agglomeration of photocatalyst particles and also to improve their photocatalytic activity, they can be mixed with low cost and abundant materials forming composite photocatalysts as shown in the literature, e.g., clay for ZnO [14,15], zeolites for TiO 2 [16,17], chitosan for TiO 2 [18,19], perlite for TiO 2 [20], and cellulose/lignocellulose for TiO 2 [21,22]. In many of these composite photocatalysts, the natural and abundant material acts as support for the photocatalyst particles, thus allowing a good dispersion of the titanium oxide particles while avoiding their agglomeration.…”

Gap type effect on photocatalytic degradation using newly hydrotalcite nanoposite precursor synthesized by hydrothermal method

“…Photocatalysis operates on the principle of degrading materials under the influence of light with energy equal to or greater than its band gap (h ≥ Eg). This process involves catalyzing chemical reactions through electronically excited species generated by photon absorption (Khatamian et al, 2010;Dessie, 2017;Terna et al, 2021).…”

Optimization Conditions of Malachite Green Adsorption onto Almond Shell Carbon Waste Using Process Design

“…Therefore, it is necessary to effectively remove dyes from water. Treatment technologies such as coagulation [ 2 ], photocatalytic degradation technique [ 3 ], filtration through membranes [ 4 ], and adsorption [ 5 , 6 , 7 , 8 , 9 , 10 ] are used. The adsorption technique is one of the most cost-effective, efficient, and eco-friendly methods, as no byproducts are formed during the purification process.…”