Degradation of formaldehyde aqueous solution by Bi based catalyst and its activity evaluation

Abstract

Bi based catalysts have attracted continuous attention from the scientific community because of their excellent photochemical properties and wide application in photocatalytic treatment of environmental pollution.

Investigation on the photocatalytic degradation properties of BiOX on carbendazim and its mechanism

“…Each diffraction peak is completely consistent with its standard card (JCPDS No. 06-0249), [30][31][32] belonging to tetragonal structure. BiOBr has typical diffraction peaks at 10.9°, 31.69°, 32.22°a nd 46.21°and these are well matched with the crystal planes (001), ( 102), ( 110) and (200), respectively.…”

“…BiOX catalysts were synthesized and prepared via a solvothermal method, and solution A and solution B were prepared as required. [30] In a typical run, 5 mmol of Bi(NO 3 ) 3 ⋅ 5H 2 O was dissolved in 35 mL of 2-Methoxyethanol aqueous solution (V 2-Methoxyethanol / V water = 1/1) to form solution A. Meanwhile, 5 mmol of KCl (or KBr, KI) was dissolved in 35 mL of 2-Methoxyethanol aqueous solution to form solution B.…”

Development and study of a bifunctional photocatalyst based on SAPO-34 molecular sieve

“…After stirring for 30 min, the above mixture was put into a hydrothermal synthesis kettle lined with polytetrafluoroethylene and hydrothermally treated at 120 1C for 12 h. The resulting solid was first washed with deionized water to neutral and then washed with anhydrous ethanol three times, and the solid was collected and placed in an oven at 100 1C for 8 h. The solid was dried in an oven at 100 1C for 8 h to obtain BiVO 4 crystals. 37 Preparation of the SAPO-34 molecular sieve. SAPO-34 molecular sieve was prepared by using silica sol as the silicon source and Al 2 O 3 as the aluminum source.…”

Activated metal Bi and La modified SAPO-34 molecular sieve and its photocatalytic degradation of formaldehyde in aqueous solution

“…The SAPO-34 molecular sieve has a large speci c surface area [1,2], well-developed pores, and abundant active sites [3], and has been widely used in catalytic oxidation [4][5][6].In recent years, in order to overcome the problem that SAPO-34 molecular sieve is easy to accumulate carbon in the catalytic process due to the complex pore structure [7][8][9][10], its pore structure can be changed by introducing other elements. For example, the precious metal Bi is introduced into the skeleton structure of SAPO-34 [11][12][13], so that it participates in the composition of the pore structure of SAPO-34 molecular sieve [14][15][16]. Meanwhile, Bi element itself has diverse valence states and surface plasmon resonance (SPR) effect, and this doping method makes the prepared molecular sieve possess certain photoresponse and accelerate the charge mobility in photocatalytic reaction, thus improving the e ciency of photocatalyst [17][18][19].…”