Preparation of activated carbon from the wood of paulownia tomentosa as an efficient adsorbent for the removal of acid red 4 and methylene blue present in wastewater

Sultan Alam, Muhammad Sufaid Khan, Wahida Bibi, Ivar Zekker, Juris Burlakovs, Makarand M. Ghangrekar, Gourav Dhar Bhowmick, Anna Kallistova, Nikolai Pimenov, Muhammad Zahoor

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Paulownia tomentosa, a woody plant that is widely found in Pakistan and in other regions of the world, was used as a raw material to prepare activated carbon using chemical and physical activation methods. Adsorption of the dyes-acid red 4 and methylene blue onto the prepared activated carbon were analyzed by batch experiments. The impacts of different adsorption parameters such as pH, temperature, contact time, initial dye concentration and adsorbent dosage were also evaluated. Equilibrium data were fitted into various isotherm models such as: Langmuir, Temkin and Freundlich. High regression values were achieved with Langmuir isotherm model. Different kinetic adsorption models such as pseudo-first-order, pseudo-second-order and intra-particle diffusion model models were applied. The adsorption kinetics was found to be best-fitted into pseudosecond-order kinetic model. The optimum pH for acid red 4 was around 1 while for methylene blue it was 8. The optimum adsorbent dosage was 0.3 g for both dyes used. The activation energy (Ea) values were 30.57 and 3.712 kJ/mol, respectively for acid red 4 and methylene blue while the enthalpy (ΔH) and entropy (ΔS) values were correspondingly as 24.88/1.1927 kJ/mol and-2843.32/-0.329 J·mol/K for the mentioned dyes. The experimental result showed that the prepared activated carbon was the best in the removal of acid red 4 and methylene blue from aqueous media and therefore, could be preferably used as cheap adsorbent in wastewater treatment.

Original languageEnglish
Article number1453
JournalWater (Switzerland)
Volume13
Issue number11
DOIs
StatePublished - 1 Jun 2021
Externally publishedYes

Keywords

  • Acid red 4
  • Activated carbon
  • Equilibrium data
  • Methylene blue
  • Paulownia tomentosa

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Biochemistry
  • Aquatic Science
  • Water Science and Technology

Fingerprint

Dive into the research topics of 'Preparation of activated carbon from the wood of paulownia tomentosa as an efficient adsorbent for the removal of acid red 4 and methylene blue present in wastewater'. Together they form a unique fingerprint.

Cite this