Enhanced accumulation and visible light-assisted degradation of azo dyes in poly(allylamine hydrochloride)-modified mesoporous silica spheres

Journal Article · Wed Feb 04 04:00:00 EST 2009 · Materials Research Bulletin

OSTI ID:21199667

Bing, Liu; Qian, Hou; Hui, Xu ^[1]

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1. Key Laboratory for Nanomaterials of the Ministry of Education, Beijing University of Chemical Technology, Beijing 100029 (China)

A new route for the economic and efficient treatment of azo dye pollutants is reported, in which surface-modified organic-inorganic hybrid mesoporous silica (MS) spheres were chosen as microreactors for the accumulation and subsequent photodegradation of pollutants in defined regions. The surface-modified silica materials were prepared by anchoring the polycationic species such as poly(allylamine hydrochloride) on MS spheres via a simple wet impregnation method. The as-synthesized spheres with well-defined porous structures exhibited 15 times of accumulating capacity for orange II and Congo red compared to that of the pure MS spheres. Diffuse reflectance UV-vis spectroscopy and confocal laser scanning microscopy demonstrated that the accumulated orange II and CR in defined MS spheres were rapidly degraded in the presence of Fenton reagent under visible radiation. Kinetics analysis in recycling degradation showed that the as-synthesized materials might be utilized as environment-friendly preconcentrators/microreactors for the remediation of dye wastewater.

• OSTI ID: 21199667
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMINES
AZO DYES
ELECTRON MICROSCOPY
KINETICS
RECYCLING
REMEDIAL ACTION
SILICA
SOL-GEL PROCESS
SPECTROSCOPY
SULFONIC ACIDS
SURFACE PROPERTIES
SURFACES
VISIBLE RADIATION
WASTE WATER