Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras

A Process for the removal of Dyes from waste waters of Industrial Effluents

Technology Category/Market

Technology: Method for the removal of Dyes from waste waters;

Industry: Textile Industries & dye processing Industries & etc.

Applications: Industrial wastewater treatment

Market: The global wastewater treatment market is projected to grow at a CAGR of     6.3% during the period of 2022 to 2028


Problem Statement

  • Generally, there are many treatment methods have already available for wastewater treatment by using functionalized nanocomposites, which is expensive and tedious process.
  • Hence, there is a need to mitigate above challenges efficiently.
  • Present Patent provides solution by addressing above issues in efficient manner.



  1. The present invention describes a process for the preparation of nanocomposite adsorbents for the removal of dyes from wastewaters of Industrial effluents.
  2. The proposed process consists of mainly three steps which are illustrated in the smart chart A and suitable figures.
  3. The three different dimensional nanomaterial before & after have been characterized by UV-visible and FTIR-spectrum for ensuring color absorbance, shown in Fig.1a,,1b,1c.
  • The key features of said patent is given herein:
  • 1st step explains the preparation of nanocomposites from at least one substances of the following group of nanometals & nanomaterial oxides;
  • 2nd step talks about passing the waste-water through at least nanofiltration membrane
  • 3rd step discloses
  • further
  • passing the filtered wastewater thereafter over the nanocomposites to enable the nanocomposites to absorb the dyes in the wastewater

Key Features/Value Proposition

Technical Perspective:

  • The nanocomposites are prepared from selected group of nanometals & nanometal oxides like Au, Ag, Fe, Co, Ni, Pt, Pd, Ru, ZnO. TiO2, MnO2, Fe2O3, Fe3O4 dispersed on a support material consisting of two or three different dimensional nanomaterials selected from namely carbon nanotubes, thermally exfoliated graphite, chemically exfoliated graphite oxide, graphene sheets, graphene functionalized carbon nanotubes/graphene.
  • The Nanofilteration membrane is configured of a biocompatible material such as chitosan, polypyrote.
  • The nanocomposites are being further treated with an inorganic acid for re-using said nanocomposites, (inorganic acids consists of hydrochloric, sulphuric, and nitric acid).
  • Optimum conditions for all dyes removal were obtained with absorbent dosage of 100ppm of dye in 1 litre of water per gram with an equilibrium time of 1 hour.

Industrial Perspective:

  • Cost effective & simple eco-friendly sustainable process for wastewater treatment thereafter reuse water.
  • Facilitates the experimental results by the removal of Tolune blue, Evan’s blue, Trypan blue, Eosin yellow & Coomassic Brilliant Blue from aqueous solutions, VAT dye, AZO dye &industrial wastewaters.
Questions about this Technology?

Contact for Licensing

Research Lab

Prof. Ramapabhu S, 

Department of  Physics

Intellectual Property

  • IITM IDF Ref. 785

  • IN Patent No: 288734

Technology Readiness Level

TRL- 4/5

Proof of Concept, tested & validated

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