Abstract:

A non-woven viscose material was modified with self-made cationic gelatin protein auxiliary by the padding process. The material prepared was then used as an environmentally friendly colour absorbent for the decolourisation of dye wastewater. The effects of the sodium hydroxide swelling pretreatment process and cationic padding modification process on the colour absorption and decolourisation rate were discussed. Moreover an optimal preparation process for the colour-absorbing material was determined. This was as follows: In order to make the non-woven viscose material swell and improve the subsequent modification effect, first the non-woven viscose material was pretreated with an aqueous solution containing 50 g/l of sodium hydroxide, at room temperature, for 5 min. Then the material was padded in a mixed aqueous solution containing 80 g/l of cationic gelatin and 18 g/l of sodium hydroxide by means of a laboratory padder with two dips and two nips. After treatment, the material was dried and steamed for 4 min. Lastly the material was washed with water and dried. The results show that the colour-absorbing material prepared by this process has the advantages of a high colour absorption rate and high decolourisation percentage. And it could be applied to the decolourisation of printing and dyeing wastewater, or to prevent washed off dyestuff staining on light colour clothes in the process of laundry.