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Removal of Heavy Metals from Plating Wastewater by Crystallization/Precipitation of Gypsum
Author(s) -
Huang CheinHo,
Wu ChengKwung,
Sun PingChing
Publication year - 1999
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199900088
Subject(s) - gypsum , chemistry , precipitation , nucleation , crystallization , solubility , adsorption , ionic strength , zeta potential , metal , hydroxide , inorganic chemistry , wastewater , colloid , plating (geology) , metal hydroxide , sulfate , metallurgy , chemical engineering , aqueous solution , environmental engineering , geology , organic chemistry , nanoparticle , physics , materials science , geophysics , meteorology , engineering
A high surface area was created during nucleation and crystal growth of gypsum by mixing calcium and sulfate ions, causing adsorption of heavy metals on the colloids of gypsum and capsulation in the subsequent precipitation process. In addition to the effect of surface area, zeta potential and surface pH of the gypsum colloids, ionic strength of solution, as well as solubility and particle size of the metal hydroxide influenced the extent of uptake of heavy metals from wastewater.