Abstract
The sorption of coconut-core active carbon for automatic elimination of organic impurities, oxidized or reduced substances of 2-butyne-1·4-diol, in bright nickel plating bath was investigated.The results obtained were as follows:1) The sorption points of acidic impurities and alcoholic ones were different each other.2) Much more 2-butyne-1·4-diol (brightener) was sorbed than its oxidized or reduced substances (acidic or alcoholic impurities).3) The process of automatic or semi-automatic elimination of the organic impurities was preferable to conduct in the following order of sequence.(a) Passing through 30g/l of coconut-core active carbon of 30-50 mesh about 5 times for elimination of the brightener.(b) Adding 0.1g/l of KMnO4 to the solution.(c) Dissolving the precipitate obtained (MnO2) with 0.143ml/l of 30% H2O2.(d) Passing through the active carbon layer, used in the process of (a), more than 9 times for more than 1hr.
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