Reduction and dissolution of manganese(III) and manganese(IV) oxides by organics. Part 2. Survey of the reactivity of organics

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00126a010· OSTI ID:6185233

Stone, A T; Morgan, J J

Reduction and dissolution of manganese(III,IV) oxide suspensions by 27 aromatic and nonaromatic compounds resembling natural organics were examined in order to understand the solubilization reaction in nature. At pH 7.2 10/sup -3/ M formate, fumarate, glycerol, lactate, malonate, phthalate, propanol, propionaldehyde, propionate, and sorbitol did not dissolve appreciable amounts of oxide after 3 h of reaction. The following organics did dissolve manganese oxides under these conditions and are listed in order of decreasing reactivity: 3-methoxycatechol approx. catechol approx. 3,4-dihydroxybenzoic acidapprox. ascorbate > 4-nitro-catechol > thiosalicylate > hydroquinone > 2,5-dihydroxybenzoic acid > syringic acid > o-methoxyphenol > vanillic acidapprox. orcinol approx. 3,5-dihydroxybenzoic acid > resorcinol > oxalite approx. pyruvate approx. salicylate. Relative reactivities of organic substrates are discussed in terms of surface complex formation prior to electron transfer. Dissolution of manganese oxides by marine fulvic acid was enhanced by illumination, verifying that the reaction is photocatalyzed.

• Research Organization: California Inst. of Tech., Pasadena
• OSTI ID: 6185233
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 18:8; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

520100* -- Environment
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACTIVATION ENERGY
AROMATICS
CHALCOGENIDES
CHEMICAL REACTIONS
DISSOLUTION
ELECTRON TRANSFER
ELEMENTS
ENERGY
FULVIC ACIDS
HYDROGEN COMPOUNDS
MANGANESE
MANGANESE COMPOUNDS
MANGANESE OXIDES
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOTOCHEMICAL REACTIONS
REDUCTION
SEAWATER
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER