Reference

Photoinduced oxygen formation and silver metal deposition in aqueous solutions of various silver salts by suspended titanium dioxide powder

Photoinduced oxygen formation and silver metal deposition in aqueous solutions of various silver salts by suspended titanium dioxide powder. Nishimoto, Seiichi; Ohtani, Bunsho; Kajiwara, Hiroshi; Kagiya, Tsutomu (Dep. Hydrocarbon Chem., Kyoto Univ., Kyoto 606, Japan). J. 13463-67-7 and 10294-26-5 are also occured in this study. Chem. Soc., Faraday Trans. 1, 79(11), 2685-94 (English) 1983. CODEN: JCFTAR. ISSN: 0300-9599. DOCUMENT TYPE: Journal CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Section cross-reference(s): 67 The photochem. reaction of Ar-purged aq. solns. contg. various Ag salts and TiO2 powder in suspension was studied at room temp. Photoirradn. at <300 nm results in O2 formation and deposition of Ag metal on the TiO2 particles. The apparent reaction rate depends on the anions of the Ag salt and increases in the order ClO4- < NO3- u SP42- < F- u PO43-. The sensitizing activity of rutile is comparable to that of anatase. The molar ratio of deposited Ag metal to liberated O2, which is independent of the reaction rate, is ~5 except for anatase/AgClO4. The pH of the reaction mixt. decreases with irradn. time, resulting in deactivation of the TiO2. Although O2 formation and Ag metal deposition do not occur at pH <2, the photosensitizing activity of the TiO2 powder is recovered by the addn. of NaOH. The addn. of Me2CHOH to the deactivated acidic suspension of TiO2 is effective for Ag-metal deposition but not for O2 formation. .

Recovery of silver from x-ray film

Recovery of silver from x-ray film. Kunda, W.; Etsell, T. H. (Dep. Miner. Eng., Univ. Alberta, Edmonton, AB T6G 2G6, Can.). Precious Met. Proc. Int. Precious Met. Inst. Conf., 9th, Meeting Date 1985, 289-304. Edited by: Zysk, Edward D.; Bonucci, John A. Int. 10294-26-5 and 7761-88-8 are cas registry numbers of chemicals which are used as reagents here. Precious Met. Inst.: Allentown, Pa. (English) 1986. CODEN: 55KBAH. DOCUMENT TYPE: Conference CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Various methods for Ag recovery from x-ray film were investigated and the results evaluated with respect to Ag recovery and product purity. Two main routes were studied: (1) incineration of the film followed by HNO3 leaching of the ash, (2) stripping of Ag from the film in an alk. medium and extn. of Ag from the residue by HNO3 leaching. The Ag from both leach solns. was processed to high purity Ag powder by pptn. of Ag2SO4 with H2SO4, and conversion of Ag to metal by calcining Ag2SO4 with Na2CO3 at 600°. .