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Construction and visible‐light photocatalytic performance of carboxyethyltin/transition metal–functionalized wheel‐like tungstophosphates
Author(s) -
Yu XiaoShu,
Cui HongJuan,
Wang QiZhi,
Li JianSheng,
Su Fang,
Zhang LanCui,
Sang XiaoJing,
Zhu ZaiMing
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5720
Subject(s) - chemistry , polyoxometalate , x ray photoelectron spectroscopy , transition metal , photocatalysis , aqueous solution , crystal structure , crystallography , nuclear chemistry , titanium dioxide , hydrolysis , metal , infrared spectroscopy , analytical chemistry (journal) , stereochemistry , catalysis , materials science , metallurgy , organic chemistry , nuclear magnetic resonance , physics
The wheel‐like tungstophosphate ([P 8 W 48 O 184 ] 40− , abbreviated as P 8 W 48 ) reacted with estertin trichloride (Cl 3 SnRCH 3 , R = CH 2 CH 2 COO) in aqueous solution, resulting in a new wheel‐like polyoxometalate (POM) containing six SnR fragments, formulated as K 6 Na 24 [{(SnR(H 2 O)) 2 ( μ ‐OH)( μ ‐SnR(H 2 O))} 2 (P 8 W 48 O 184 )]·59H 2 O (abbreviated as Sn 6 ‐ P 8 W 48 ). Based on this, the transition metal (TM) was further introduced into the Sn 6 ‐ P 8 W 48 system, self‐assembling three other wheel‐like POMs with the general formula K x Na y H 26 − x − y [{TM(H 2 O) 3 (SnR(H 2 O)) 2 ( μ ‐OH)( μ ‐SnR(H 2 O))} 2 (P 8 W 48 O 184 )]· n H 2 O (abbreviated as TM 2 ‐ Sn 6 ‐ P 8 W 48 , TM = Mn, Co, Ni; x = 0, 1, 2; y = 19, 22, 15; n = 72, 85, 75, respectively). The structures of these new organometal and TM co‐modified compounds were characterized using infrared, UV–Vis. spectroscopy, 119 Sn NMR, and powder‐ and single‐crystal X‐ray diffraction analysis. The estertin precursor hydrolyzed into carboxyethyltin (SnR) fragment in these crystalline POM materials, which can improve their adhesion to titanium dioxide (TiO 2 ). The photocatalytic performance of Sn 6 ‐ P 8 W 48 , TM 2 ‐ Sn 6 ‐ P 8 W 48 , and their TiO 2 composites was examined by studying the degradation of a model dye pollutant Rhodamine B (RhB) under visible‐light irradiation without adding hydrogen peroxide (H 2 O 2 ), and the photocatalytic mechanism was also discussed. The experimental results show that the title compounds exhibit a quicker and better photocatalytic degradation effect on RhB compared with their parent compound, indicating that the introduced organotin groups play a significant role. Moreover, it was found that H 2 O 2 was produced after illumination pretreatment for POM solution, promoting the photocatalytic reaction.