Visible-light-enhanced photothermocatalytic activity of ABO3-type perovskites for the decontamination of gaseous styrene

Abstract

ABO 3-type perovskites (A=La, Ce, Sm; B=Cr, Mn, Fe, Co, Ni) were systematically fabricated via a facile soft-templated sol-gel with post-calcination method through a complexation-carbonation-oxidation process, which were successfully applied in the visible-light-driven photothermocatalytic degradation of volatile organic compounds (VOCs) for the first time. Preliminary characterization results revealed the lower impact to the oxidative performance and visible-light-absorption properties of ANiO 3 than LaBO 3 , while the latter ones should present more attractive promotion of catalytic performance toward VOC degradation. Subsequently catalytic degradation of VOCs using gaseous styrene as model compound confirmed that all LaBO 3-type perovskites possessed both high visible-light-driven photocatalytic and temperature-induced thermocatalytic activities. Meanwhile, synergetic effect between photocatalysis and thermocatalysis activities of different position B substituted LaBO 3 resulted in different enhancement of their photothermocatalytic activities, where the highest synergistic factor (3.53) was obtained for LaMnO 3 at 140 o C. Besides, the synergetic effect could also effectively preserve the activity of the perovskite catalysts (eg. LaMnO 3) that almost the same removal efficiency (ca. 96.6% within 40 min) was obtained to styrene (initial concentration of 40 ppmv) after five continuous cycling tests. The highly and stably photothermocatalytic activity of these perovskites were attributed to the coefficient effect of the small crystal size and narrower bandgap as well as high visible light absorption and reducibility. This work could provide an efficient and practical way to utilize the total energy of sun for the remediation of atmospheric environment pollutions.

An Emerging Visible-Light Organic–Inorganic Hybrid Perovskite for Photocatalytic Applications

“…Shen et al [54], in their interesting research on hybrid organic-inorganic perovskite for solar cell application, assigned this peak to the methyl group. The conclusion obtained here agrees well with that reported by previous literature confirming the achievement of the synthesis processes [18,[63][64][65][66].…”

“…Peak corresponding to 401 eV peak were assigned to N1s Figure 4D. In accordance with the studies performed by Chen et al [64], N state may vary and the associated peaks can be found at different BE. Different peaks positions were found in a range of 396-404 eV in agreement with Nakamura and Mrowetz et al [65].…”

Metal–organic framework-based nanomaterials for adsorption and photocatalytic degradation of gaseous pollutants: recent progress and challenges

“…Recently, photocatalysis with a semiconductor has been proven to be efficient in the degradation of a wide range of organic pollutants as well as detoxification of hazardous compounds in practical applications. 16,[60][61][62]143 Recently, MOFs have also been demonstrated as semiconductors and are capable of generating reactive charges and transferring the photo-generated charges to reactive sites for in situ degrading organic compounds into CO 2 and water upon light irradiation, resulting in the regeneration of adsorbent MOFs and avoiding secondary pollution. The unique chemical and physical properties of MOFs hold great potential for photocatalytic degradation of VOCs.…”

Silver-Copper Oxide Heteronanostructures for the Plasmonic-Enhanced Photocatalytic Oxidation of N-Hexane in the Visible-NIR Range

“…are continuously contributing to the VOCs emissions in indoor habitats [1,2,3,4,5]. There are currently different exploring technologies devoted to VOCs remediation including the use of plasma discharges [6,7,8,9], microwaves combining absorption–desorption–combustion steps [10,11,12], photodegradation [2,5,13,14,15,16,17,18,19,20], and adsorption/catalytic oxidation [2,21,22,23,24,25,26,27,28,29]. Total oxidation of VOCs promoted by conventional catalysts represents one of the most appealing alternatives.…”

“…Noble metals are able to completely oxidize VOCs into CO 2 and H 2 O at mild reaction temperatures [22,23,25,30,31,32,33,34,35,36,37,38,39]. Transition metal oxides and complex metal oxides (i.e., rare earth element-based perovskites) are also excellent VOCs oxidation candidates that operate at relatively mild temperatures without incurring in the burdening costs of noble metals [3,8,16,37,38,39,40,41,42,43,44,45]. Alternatively, the use of inexpensive arrays of photocatalysts based on titania (TiO 2 ) has become one of the most important research fields towards the sustainable remediation of VOCs [5,20,46,47,48,49,50,51].…”