A series of strontium-lanthanum oxide mixed manganese nodules were prepared and characterized by X-ray diffraction, nitrogen adsorption-desorption, electrical conductivity, and surface excess oxygen. X-ray diffraction patterns confirm the formation of perovskite-type oxides at low strontium content
Studies on Indian Ocean Manganese Nodules
โ Scribed by K.M. Parida; B. Gorai; N.N. Das
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 112 KB
- Volume
- 187
- Category
- Article
- ISSN
- 0021-9797
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โฆ Synopsis
Adsorption of aqueous selenite (SeO32-) on Indian Ocean manganese nodules was studied as a function of time, temperature, pH, and concentrations of adsorbate and adsorbent in acetic acid-sodium acetate buffer medium. Analysis of adsorption data supports a heterogeneous nature for the surface of manganese nodules. The adsorption capacity of various manganese nodules for selenite was correlated with their chemical composition and surface properties.
๐ SIMILAR VOLUMES
45 mm) were dried at 110ะC for 8 h and stored in a Adsorption of aqueous phosphate on Indian Ocean manganese desiccator over fused CaCl 2 for further use in characterizanodules was studied as a function of time, pH, and concentrations tion and adsorption studies. ## of adsorbate and adsorbent in ac
extensively studied and the results are well documented in The oxidation of thiols to corresponding disulfides by Indian the literature ( 16). However, their oxidizing ability and cata-Ocean ferromanganese nodules has been studied under varying lytic activity for organic reactions have been sparsely
ร400ะC (8)(9)(10)(11). A number of attempts have been made to The promoting effect of Ag 2 O on the physicochemical properties modify the surface properties and catalytic activity of the and catalytic activity of manganese nodules has been investigated. nodules (10, 12, 13); for example, incorporati
In order to activate the naturally occurring material, sam-The effects of acetic acid treatment on the physicochemical ples 075/45 mm were treated with various concentrations properties and catalytic activity of manganese nodules have been (0.1 to 1 M) of acetic acid. About 10 g of the sample was st