Wastewater treatment, using waste materials as adsorbents, represents a path for developing sustainable processes and for reducing the environmental burden. The use of fly ash in wastewater treatment, for heavy metal immobilisation, represents a topic much addressed to in the past years solving both, the problems of advanced treatment and the intelligent use of fly ash.

Ion exchange or chemical trapping of the ions, on the fly ash surface, are the expected processes for heavy metal removal on this substrate.

The fly ash surface properties depend on many factors, including the coal composition, the burning process and the furnace characteristics. Developing an up-scalable process requires reproducible surface properties, less (or no) related to the above mentioned influences.

The study presents the results obtained in Cd²⁺ and Ni²⁺ removal, using fly ash from CHP Brasov (Romania) with modified surface. The fly ash morphology is characterised using AFM while XRD provides composition and crystallinity data.

Metal ions solutions (c = 10^-4 – 10^-2m) are mixed in a reaction flask with fly ash (powder); samples of fly ash washed in ultra pure water or with modified surfaces after long contact with alkaline (NaOH), acid (HCl) and complexing agents (Complexone III, pyrocatechol violet) were used in series of experiments. Using the optimized adsorption parameters (contact time, wastewater volume: adsorbent mass ratio), the adsorption isotherms are obtained and the adsorption mechanisms are discussed.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/11244 must be provided.

1. Electrochemical deposition of advanced materials based on SnO₂ using polymeric additives
2. Kinetics of dyes photodegradation over cadmium doped TiO₂
3. Tailoring WO₃ Thin Layers Using Spray Pyrolysis Technique
4. Crystallinity of Nanostructured Cu₂S Thin Films Deposited by Spray Pyrolysis. A Defect Chemistry Approach
5. Tailoring Alumina Thin Films Properties Using Hidrophile/Hidrophobe Polymer Additives
6. Electrochemical Deposition of Ni-Based Thin Film Cermets Using Polymeric Additives