抄録
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.
