Synthesis and sonocatalytic property of rod-shape Sr(OH)2·8H2O

Abstract

A novel rod-shape sonocatalyst Sr(OH)2·8H2O was prepared by a facile precipitation method, and characterized by X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy and UV-vis absorption spectroscopy. Comparative sonocatalytic degradation experiments were carried out in different conditions under ultrasonic irradiation by using rhodamine B (RhB) as the model substrate, indicating that Sr(OH)2·8H2O was highly sonocatalytic. Total organic carbon experiment demonstrated Sr(OH)2·8H2O with mass mineralization of organic carbon. The effects of catalyst amount, initial RhB concentration and ultrasonic energy of degradation were investigated, and the sonocatalyst could be reused 5 times without significant loss of activity. Furthermore, the potent degrading capability was ascribed to ultrasonic cavitation producing flash light/energy which generated radicals (e.g., OH) with high oxidation activity.

Visible Light Responsive Strontium Carbonate Catalyst Derived from Solvothermal Synthesis

“…Notably, mixed phases of SrCO 3 and hydrated strontium hydroxides (Sr(OH) 2 •xH 2 O, where x is the number of molar coefficient of water in strontium hydroxide solid) were obtained from all other synthesis conditions (results shown in Supplementary Materials: Figures S1 and S2). Typical diffraction peaks correspond well with (110), (111), (021), (002), (012), (130), (220), (221), (132) and (113) orthorhombic SrCO 3 lattice planes [34,36], whereas other diffraction peaks match with those of previously reported Sr(OH) 2 •H 2 O [37] and Sr(OH) 2 •8H 2 O phases [38]. The formation of Sr(OH) 2 xH 2 O is possibly due to adsorbed alcohol, promoting the addition of OH functional groups on the solid surface [39], upon solvothermal crystallization of Sr-containing products.…”

Aerobic Oxidation of Benzyl Alcohol on a Strontium-Based Gold Material: Remarkable Intrinsic Basicity and Reusable Catalyst

“…Lopez-Sanchez et al have concluded PVA-stabilized gold NPs may have its activity affected by the stabilizer for CO oxidation reactions. They proposed an efficient water extraction method that is able to clean the NPs surface, maintaining their size and morphology [30]. The Au/calc-Sr sup catalyst is very active considering that no base was added to the reaction medium; therefore, we performed an extraction with acetone, and it was applied to this material with some modifications.…”

“…The supports were prepared according to literature with modifications [30]. For one of them, 50 mL of strontium nitrate (1 mol L −1 ) and 50 mL of sodium hydroxide (2 mol L −1 ) were mixed and constantly stirred for 1 h. The mixture was centrifuged for 5 min at 2400 rpm and a white precipitate was obtained by pouring the supernatant off.…”

Facile Synthesis of SrCO3-Sr(OH)2/PPy Nanocomposite with Enhanced Photocatalytic Activity under Visible Light

“…In the search to find a cheap and straight route to obtain the SrCO 3 phase, it was chose to dry Sr(OH) 2 at ambient atmosphere to take advantage of the reaction with CO 2 present in the air [42,43,44,45,46,47]. …”

“…Taking into account some reports about SrCO 3 -Sr(OH) 2 composite as background [42,43,44,45,46,47], and due the SrCO 3 -Sr(OH) 2 /PPy nanocomposite has not been studied as a photocatalyst candidate, this manuscript describes a modified strategy for the preparation of SrCO 3 -Sr(OH) 2 nanocomposite, followed by coating with the semiconducting polypyrrole (PPy) to increase its photoactivity in the visible light range. Both SrCO 3 -Sr(OH) 2 and SrCO 3 -Sr(OH) 2 /PPy nanocomposites were tested for photodegradation of MB dye under visible light irradiation.…”