This invention relates to a process for the preparation of nanocomposite adsorbents for the removal of dyes from waste waters of industrial effluents
The treatment of industrial waste-watera is effected by oontactijig waste-water feed atreama with at least OUB NANOFLUTCATION membrane with. nsnocom-posites which conaist^s of at least one oanD-metal or naoo-metal oxide or both dispersed on snppoit materials corxsisting of two or three dittercnl dimensional (a cxtmbiridtion of one dtmensionai, two dimensional and three dimensional) nanomatcrials. The process has been checked for dve rcmovai fix>m tannery effluent and textile effluents.
The development of novel functionahzed naaocompositcs made up of at

solutions, VAT dye, AZO dye and industrial waste-waters.

Optimum conditions for all dyes removal were obtained with adsorbent dosage of lOO-ppm of dye in 1 litre of water per gram with an equilibrium time of 1 b. Tbe nanocomposites with at least one nanoSltration membrane with nanocomposites which consist of at least one nano-metal or nano-meta} oxide or both dispersed on support JziateriaJs consisting of three different dimensional nanomaterials before and after have berJ3 ciiaractcrized hy UV-viaibJe and FTIR- flpectnim for ej^simng color adsorbance.
The process for the manufacture of nanocomposites for removal of dyes ftota waste-waters of industrial effluents, according to this invention, comprises the steps of preparing nanocomposites fiom at least one substance of the Iblfowing group of nanometais and nanometai oxKJes, namefy, Au, Ag, Fe, Co, Ni, Pt, Pd, Ru ZaO, TiO^, Mu02, Fe203, FCSOA dMpcrscd ou a support material coasistiug of two or three diflfcrcut dimeasiioaal aaaom^aterials selected Gxim at least one of the following, namely, carbon nanotubes, thermally exfoliated gyapbite, chemically exfoliated graphite oxide, grapbene sheets, graphene, iiinctiozialized carbon nanotubes/grapbene; passing the waste waters through at least one nanoGltration membrane which is madc^ of a biocompatible material such as cbilDsan, polypyrole; passing the waste water thereafter over the nanocomposites to enable the nanocomposites to adsoJl> the dyes in

The inorganic acids ai-e at least one of the following, namely,
hydrochloric, sulphuric and nitric acids.


was discovered in 1856, many thousands of dyes have been produced. Many stable dyestuffs have been synthesized and unfortunately these arc the most diSicult to degrade once they eater a waterway. The effects of dyes in certain environmental areas, that is, in suivatic organisms^ such as fish and aigae are kno^w. Basic dyes are used in the dyeing of silk, cotton, WDoJ, aciyjic ^bexs and other fibej:s that contain anionic sites which attract and interact with cationic moJeciiles. The present invention enables the adsorption of Basic Blue, Eosin yellow, natural black, Tolune blue, Evan's blue. Trypan blue. Eosin yellow and Coomassie Brilliant Blue, VAT dye, AZO dye. Industrial waste-waters treated hy the nanocomposite are visibly shown in the Figures (Figure 2. la, 2a, 3a, 4a, 5a) and also shown in the t/V-vjsibfc spectrum (F%urcs 2. lb, 2b, 3b, 'tb, Sb\ and FTIR spectrum (Fliguies 2. Ic, 2c, 3c, 4c, 5c).
It is possibfc to icmovc Che dyv adsorbed oa the surfecc of Che nanocomposite by simphs suitabie fluid ttcatmeat, whetcin the fluid is any one of acids HCl, HISOA, HNOS or their combiaations.
The photographs of the pure Quid, of them, after passing through the color removiDg system and the UV-Vi»ibJe spectrum of fluid and after passing through coJor jrmoving system are shown Figure 2-6 a? and b). The purifiexl nanocomposite can be re-xised for the adsorption of difierent types of dyes. The dye adsorbed nanocomposite is shown not to give out

any of the dyes when allowed to react with water. Figure 2.7 shows the dye adsorbed nanocomposite treated with water.
The following Table illustrates the adsorption of dye concentration in a column elution (q mg/g) of nanomaterials.

We Claim:
\. ^ p'Eoce's.s fox MK^ meamfactviTC of nanoco'capoaitca for removal of dye?. fsQVBL wa-ate-vratexa of iadviatswl e.f5.\sfi.n.ts compriainft the. steps of ptepariu^ nanocotCLposites fmm, at- least one subatjEuice of the followmg group of nauoTu^taJji ami nanotcwtal oxtdea, namftly, An, Ag, Fe, Co, Ni, Pt, Prt, Ru ZnO, TiOi, MnOi, FcaO:i, Fe^O^ dispelled on a support materia] 'consisting of two oi' tlirec diffen-nt dimensional natiomatcrials selected irom at least one of the following, namciy, carbon nanotubcs, thermally exfoliated graphite, ciiemicaiiy exlbiialed grapljite oxide, grapiiene siincts, grapiicne, imictxoiiiiiiicd cmboji nanofufaes/giaphene; paasing the wnvtt wateis ffjiougii a( l(;as( one iiaiiofiltTation meinbraw^ ivhich is iiiade of a tiiooompafibte matei-mt sach as chitosan, polypyinfc; passing the waste water tliereafter over tiic naiiocomposites to enable the n^iocomiiositcs to adsorb the dyts ia. the said waster waters, the naaocozapositcs being then treated with an. iaorgaziic cicid for IV n-stag the aski nanocompoaites.
2. A prorr«^ as rlwinied in CJaira 1 wherein the inoji^anjc arids are at Irast one of the foUoiving, namely, hydrochioiic, siiipiniric and nitric acids.

3, A process for the maiiiiiacture of iiaaocomposites for removal of dyes (irom waste-waters of mdustrial effluents substantially as herein described and illustrated.