Tio2 Coated Fiber Cement Composites: Effect Of The Load Of Tio2 Particles On Photocatalytic Degradation Of H2s

This paper evaluated the effect of the amount of mass of the commercial photocatalyst Fotosan (R) (PC) based on TiO2 in the modification of the textural and morphological characteristics of the coatings formed in fiber cement supports (FB). The effect of mass addition on photocatalytic activity was also evaluated using the hydrogen sulfide degradation reaction (H2S) as a parameter. For this, five treatments conducted by different amounts of PC mass per area of FB in the range of 5.3 to 14.4 mg cm(-2 )were evaluated. The surfaces formed by these photocatalytic coatings (PCFB) were characterized by scanning electron microscopy with X-ray energy dispersive spectroscopy (SEM-EDS), X-ray diffractometry (XRD), nitrogen adsorption-desorption (BET) isotherms and infrared spectroscopy with total attenuated reflection (ATR-FTIR).The results of nitrogen isotherms confirmed that the coatings formed have a large specific pore volume (3.6 x 10(-2) to 5.6 x 10(-2) cm(3) g(-1)) and a high specific surface area (18.9 to 29.9 m(2) g(-1)). It was verified that the variation of PC mass over FB significantly affected the textural characteristics and the morphological structure of PCFB when comparing means between treatments (Tukey test; alpha = 5%), and probably these characteristics correlate with the respective photocatalytic activity. The modification of the structural properties produced by the accumulation of PC mass was more beneficial when the coatings were formed with a dosage of 7.3 mg cm(-2), because it corresponded to the treatment where photocatalytic activity showed maximum intensity in the reaction of H2S degradation (72%) and a minimum amount of PC used in comparison to other treatments. (C) 2020 Elsevier Ltd. All rights reserved.