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Encapsulated Cadmium Sulfide in Silicon Dioxide Porous Shells for Enhanced Photocatalytic Sustainability and Commendable Protection of Organic Carriers
Author(s) -
Zhao Jian,
Tian Shengnan,
Shi Haiting,
Quan Quan,
Xiao Changfa
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201801933
Subject(s) - materials science , photocatalysis , chemical engineering , cadmium sulfide , tetraethyl orthosilicate , calcination , polymerization , sulfide , porosity , nanoparticle , inorganic chemistry , nanotechnology , catalysis , organic chemistry , composite material , metallurgy , chemistry , polymer , engineering
The purpose of this study is to provide a solution to two troublesome problems on photocorrosion of cadmium sulfide (CdS) and photocatalysis damage to organic carrier. An encapsulation system of CdS in silicon dioxide (SiO 2 ) porous shell can be constructed by following strategies: polyporrole (PPy) layer is deposited on the surface of CdS nanoparticles via chemical redox polymerization; then the resulting PPy@CdS is covered by metasilicic acid (H 2 SiO 3 ) with polyethylene glycol by sol–gel process, which originates from hydrolysis of tetraethyl orthosilicate; after removing PPy interlayers by calcination, CdS@void@SiO 2 yolk–porous‐shell nanospheres (YSNs) are fabricated. As expected, YSN nanoarchitecture is verified by transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) analysis. The tailored void can be tuned by the sacrificed layers of PPy. CdS@void@SiO 2 YSNs exhibit excellent photostability with a considerably low level of Cd 2+ concentration at <30 ppm, which is dropped down 18 times less than ≈520 ppm of CdS. CdS@void@SiO 2 YSNs show good dye removal efficiency up to 99.5%, and commendable hydrogen evolution of 126.8 µmol g −1 h −1 . More interestingly, the transparent and porous SiO 2 shell in the YSNs has an impressive shielding to organic carrier. Our versatile YSNs have great potential to translate CdS photocatalyst to industrial‐scale application because of its stability and nondestructivity.