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characteristics, e.g. dyeability, fastness etc. It University, Rajshahi). Leaching of Sodium
is found that the dye up take by silk fibre was Sulphide Roasted Ilmenite Sand. Bang. J. Sci.
decreased with the increase of dye Ind. Res., 2007, 42(4), 367-376.
concentration. Similarly the absorption of dye
was increased with the decrease of dye The possibilities of co-leachings of Ti(IV) and
concentration. The maximum dye absorption Fe(IIl) from the.roasted product of ilmenite
has been observed at 0.9 % dye with 10 % sand with sodium sulphide at the optimum
alum for the period of 65 minutes at conditions by hydrochloric and sulphuric acid
temperature 80° C and pH 4. At this optimum were investigated. The leaching was dependent
condition the dye absorption was 93 %. The on hydrochloric and sulphuric acid
effects of sunlight in air on silk fibre have been concentrations, temperature and leaching time.
studied to investigate the colourfastness. The The optimum conditions for the best
colourfastness of dyed silk fibre of water and dissolution of Ti(lV) and Fe(III) were:
soap solution at different treatment temperature 100° C, time 60 min for 1:1
temperature was satisfactory. Considering ilmenite to sodium sulphide weight ratio
dyeability and colour-fastness, dye from henna roasted product and 10 min for 1:2 ilmenite to
matured leaves was highly applicable on sodium sulphide weight ratio roasted product,
dyeing of silk fibre as well as other protein acid concentration 4-6 N and agitation speed
fibre. 400 rpm. About 95 % Ti(lV) and 93 % Fe(Ill)
dissolutions were obtained from hydrochloric
637 HALIM, M.A. & HOSSAIN, F. (Dept. acid leaching and 95 % Ti(lV) and 91 %
of Botany, Jahangirnagar University, Savar, Fe(IlI) were obtained from sulphuric acid
Dhaka). Biodegradation of textile dyes leaching at a solid to liquid phase ratio (S/L) of
-3
employing Fomes lignosus. Bang. J. Life Sci., 0.10 kg dm .
2006, 18(2), 17-24.
639 JAHAN, I.A.; ISLAM, M.N.;
Fomes lignosus is a white-rot basidiomycete HOSAIN, M.A.; (Fibre and Polymer Division,
fungus which has a lignolytic activity. BCSIR Laboratoties, Dhaka); SULTANA, F.
Ligninolytic enzyme system of white-rot fungi & ABEDIN, J. (Dept. of Chemical
plays an important role in decolourization of Technology and Polymer Science, Shahjalal
different dyes which are extensively used in University of Science and Technology,
textile and dye-based industries. In order to Sylhet). Studies on Indigenous Cotton linters
investigate the degradation of synthetic dyes, for Preparation of Carboxymethyl Cellulose.
five different dyes (Basilon yellow, Basilon Bang. J. Sci. Ind. Res., 2007, 42(1), 29-36.
turquoise, Vat blue, Vat orange and Vat red)
were tested in both solid and liquid culture Studies were carried out to find out a suitable
media. In solid media, F. lignosus showed the method for preparation of carboxymethyl
dye decolourization activity wihtin 6 to 10 cellulose (CMC) from indigenous cotton
days of incubation. From the linters. Special emphasis was given on
spectrophotometric analysis of liquid cultures purification method to remove most of the
of dyes also proved that F. lignosus has a non-cellulosic materials. A two-step
highly decolourizing capability. The spectra of purification method of cotton linters for
control and treated culture media for each dye preparation of water soluble car-boxymethyl
were found to differ greatly. These results can cellulose (CMC) with degree of substitution
be basis for using F. lignosus for biological (DS) 0.89 and viscosity 235 cp (0.5 %
degradation of synthetic dyes in the treatment solution) have been described.
of effluents released from dye based industries.
640 JAHAN, M.S. (Pulp and Paper Research
638 HASAN, M.K.; BEGUM, D.A. & Division, BCSIR Laboratores, Dhaka); AL-
ISLAM, M.F. (Dept. of Applied Chemistry MARUF, A. & QUAIYYUM, M.A. (Dept. of
and Chemical Technology, Rajshahi Applied Chemistry and Technology, Dhaka
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