Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green

Abstract

Dawson heteropolyacid, H 6 [P 2 W 18 O 62 ], was chemically anchored to the amine-functionalized nanosilica surface in different loadings. The synthesized nanocomposite was characterized by FT-IR spectroscopy and N 2 adsorption experiments. The preservation of the structure of the Dawson and dispersion of the cluster on the support were verified on the basis of the spectroscopic data. The photocatalytic degradation efficiency of the synthesized nanocomposites was studied using an aqueous solution of malachite green dye as a model water pollutant. The mineralization of dye contents was investigated in different loadings from 10 to 30 % at room temperature. Decolorization was observed in shorter time using 30 % loading. The photocatalyst was reusable after the filtration and remained active even after being washed with hot water, which confirm its attachment firmly to the surface of amine-functionalized nanosilica.

Recent green approaches for the synthesis of pyrazolo[3,4‐d]pyrimidines: A mini review

“…Bamoharram et al [ 25 ] made use of the acidic cesium salt in a successful attempt to apply the nanotechnology in the synthesis of new pyrazolopyrimidines 22 (Scheme 12)…”

H 4 [W 12 SiO 40 ] grafted on magnetic chitosan: a green nanocatalyst for the synthesis of [1,2,4]triazolo/benzimidazolo quinazolinone derivatives

“…Despite their extensive usage in many catalytic reactions, some disadvantages, such as their high solubility in polar medium [22] and low surface area (lower than 10 m 2 /g [23]), limit their potential catalytic performance. In order to overcome these difficulties, considerable efforts have been allocated to the immobilising of HPAs on acidic or natural porous carriers with high surface area such as silica [24], titania [25,26], zirconia (ZrO 2 ), alumina (Al 2 O 3 ) [27], mesoporous molecular sieve [28] and polymers [29].…”