Adsorption and photocatalytic performance of bentonite-titanium dioxide composites for methylene blue and rhodamine B decoloration

Abstract

Bentonite − TiO2 composites were prepared by impregnation of TiO2 and bentonite, followed by microwave irradiation processes. The composites were characterized using FTIR, SEM, XRD, and nitrogen sorption methods. Anatase phase of TiO2 in all composites are observed through XRD diffraction peaks and surface morphology of the composites. The adsorption and photocatalytic capabilities of the composites were tested in liquid phase adsorption of methylene blue and Rhodamine B. The adsorption and photocatalytic degradation experiments were conducted in the presence or absence of UV light irradiation. Langmuir and Freundlich models were employed to correlate the experimental adsorption data, and it was found that Langmuir gave better performance in correlating the experimental data. Modification of Langmuir equation to accommodate photocatalytic degradation process was conducted, and the model could represent the experimental results very well.

Structural characterization of Argania spinosa Moroccan wooden artifacts during natural degradation progress using infrared spectroscopy (ATR-FTIR) and X-Ray diffraction (XRD)

“…Fig. 1 shows the detection of broad absorption between 3750-3000 cm −1 that was attributed to the ѵOH stretching vibration of bonded hydroxyl groups in crystalline cellulose as well as in hemicelluloses and lignin (Laysandra et al., 2017; Zghari et al., 2018). The slight peak around 3278 cm −1 originating from ѵ(O6 H6⋯O3) intermolecular hydrogen bonds (Schwanninger et al., 2004) in monoclinic cellulose I β was observed (Schwanninger et al., 2004).…”

Preparation of modified paints with nano-structured additives and its potential applications

“…The shape of the hysteresis loop is of type H3 in agreement with the International Union of Pure and Applied Chemistry convention, which is associated with the stack of plate-like particles, generating slit-like pores distributed in the range between micro-and mesopores. [84][85][86][87] In case of ZnO nanoparticles, the hysteresis loops can be ascribed to H3 type due to the relative pressure of about 0.9-1.0, attributed to the fragile particle agglomerations with three-dimensional network of pores. 88 SEM and TEM images are also in agreement with these results, supporting the type of aggregation presented for both TiO 2 and ZnO nanoparticles.…”

The effect of graphitized carbon on the adsorption and photocatalytic degradation of methylene blue over TiO2/C composites

“…17,18 Thus, the combination of some adsorbents and TiO 2 nanoparticles has attracted much attention for enhancing photocatalytic activity in the degradation of organic contaminants. [19][20][21][22][23][24][25] TiO 2 composites obtained by adding a co-adsorbent, doping, or depositing on other material are helpful for solving these problems. Supporting the TiO 2 nanoparticles on adsorbents such as activated carbon, 19 clay minerals 21,22 and calcium silicate 23 is not only benecial for improving the efficiency of photocatalysis, but also favors the separation and recovery of these catalysts from aqueous solution.…”

“…[19][20][21][22][23][24][25] TiO 2 composites obtained by adding a co-adsorbent, doping, or depositing on other material are helpful for solving these problems. Supporting the TiO 2 nanoparticles on adsorbents such as activated carbon, 19 clay minerals 21,22 and calcium silicate 23 is not only benecial for improving the efficiency of photocatalysis, but also favors the separation and recovery of these catalysts from aqueous solution. These adsorbents usually have some excellent physicochemical properties such as high surface area, porous structure, large adsorption capacity, fast adsorption kinetics, good chemical and thermal stability, and low cost.…”