Liquid-liquid reaction of hydrogen peroxide and sodium hypochlorite for the production of singlet oxygen in a centrifugal flow singlet oxygen generator

Journal Article · Mon Feb 28 04:00:00 EST 2011 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2011V041N02ABEH014286· OSTI ID:21541777

Rongrong, Cui; Liezheng, Deng; Wenbo, Shi; Heping, Yang; Guohe, Sha; Cunhao, Zhang ^[1]

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1. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (China)

An attempt is made to produce gas-phase singlet oxygen O{sub 2}(a{sup 1{Delta}}{sub g}) in a liquid-liquid reaction between acidic hydrogen peroxide (AHP) and sodium hypochlorite (NaOCl). The attempt arises from the fact that basic hydrogen peroxide (BHP) has long been the prime source for producing singlet delta oxygen through its reaction with chlorine. However, BHP suffers from the defect of being unstable during storage. Exploratory experiments were performed in a centrifugal flow singlet oxygen generator (CF-SOG) with two streams of solutions, AHP and NaOCl, mixed in a slit nozzle and then injected into the arc-shaped concavity in the CF-SOG to form a rotating liquid flow with a remarkable centrifugal force. With the help of this centrifugal force, the product of the O{sub 2}({sup 1{Delta}}) reaction was quickly separated from the liquid phase. The gas-phase O{sub 2}({sup 1{Delta}}) was detected via the spectrum of O{sub 2}({sup 1{Delta}}) cooperative dimolecular emission with a CCD spectrograph. Experimental results show that it is feasible to produce gas-phase O{sub 2}({sup 1{Delta}}) from the AHP + NaOCl reaction, and the stronger the acidity, the more efficient the O{sub 2}({sup 1{Delta}}) production. However, since in the AHP + NaOCl reaction, Cl{sub 2} unavoidably appears as a byproduct, its catalytic action on the decomposition of H{sub 2}O{sub 2} into ground-state O{sub 2} remains a major obstacle to utilising the AHP + NaOCl reaction in producing gas-phase O{sub 2}({sup 1{Delta}}). Qualitative interpretation shows that the AHP + NaOCl reaction is virtually the reaction of interaction of molecular H{sub 2}O{sub 2} with molecular HOCl, its mechanism being analogous to that of reaction of BHP with Cl{sub 2}, where HOOCl is the key intermediate. It is difficult to form the intermediate HOOCl via the H{sub 2}O{sub 2} + NaOCl reaction in a basic medium, thus gas-phase O{sub 2}({sup 1{Delta}}) cannot be obtained in appreciable quantities. (active media)

• OSTI ID: 21541777
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 2 Vol. 41; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METALS
CHLORINE
CHLORINE COMPOUNDS
ELEMENTS
FLUID FLOW
FLUIDS
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
HYPOCHLOROUS ACID
INORGANIC ACIDS
INORGANIC COMPOUNDS
LIQUID FLOW
LIQUIDS
METALS
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
PEROXIDES
PH VALUE
RIVERS
SODIUM
STREAMS
SURFACE WATERS