Reference

Metal ion collecting agents

Metal ion collecting agents. Iwashita, Keigo; Nishiyama, Nobuyuki; Ohkawa, Nagisa; Kato, Yasuo; Tamura, Ryoichi (Hokutan Chemical Industry Co., Ltd., Japan). Japan. Kokai JP 52035190 17 Mar 1977 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: B01D015-00. APPLICATION: JP 75-109954 12 Sep 1975. DOCUMENT TYPE: Patent CA Section: 60 (Sewage and Wastes) The metal collecting agents, a coal deriv. (a reaction product of a salt and a coal or a H type deriv.), have Ni2+ adsorbing capacity .gtoreq.0.2 mequiv/g. Thus, a mixt. of lignite 100, Ca(NO3)2 [10124-37-5] 52, Ca(OH)2 50 parts, and water was dried, reacted at 250.degree., and the product was rinsed, then immersed in a Ca(OAc)2 soln. and dried at <1 atm. The collecting agent had Ni2+ adsorption capacity 1.05 mequiv/g at Ni equil. concn. 0.2 ppm.

Characterization of hydroxyapatite deposit layer prepared by electrochemical method

Characterization of hydroxyapatite deposit layer prepared by electrochemical method. Murayama, Miwa; Ogata, Takeshi; Katoh, Nakahide; Kuwabara, Katsumi (Dep. of Chemistry, College of Science, Rikkyo University, Toshimaku, Tokyo 171-8501, Japan). Journal of the Society of Inorganic Materials, Japan, 11(309), 119-124 (Japanese) 2004 Society of Inorganic Materials, Japan. CODEN: JSIJFR. 10124-37-5 and 7757-93-9 are also occured in this study. ISSN: 1345-3769. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Ca-deficient hydroxyapatite (DAp) crystals were deposited on a stainless steel from mixed solns. of Ca nitrate and NH4+ H phosphate by electrochem. method. The electrolyte soln. pH was adjusted to 5.0. Various morphologies of DAp were obsd. depending on bath temp. and c.d. At a room temp. and at low current densities, high cryst. Ca H phosphate, and at the same time, low cryst. hydroxyapatite-like product were obtained. At 50-80° and at low current densities, narrow and long crystals oriented perpendicularly to the substrate in the deposits. At 80° and at high current densities, c-axis-oriented plate-like crystals were deposited. The Ca/P molar ratios of the crystals obtained from solns. with Ca/P = 1.67 and 2.0 were nearly equal to 1.60 at higher current densities. .