UPM Institutional Repository

Adsorptive removal of COD from produced water using tea waste biochar


Khurshid, Hifsa and Ul Mustafa, Muhammad Raza and Rashid, Umer and Isa, Mohamed Hasnain and Yeek, Chia Ho and Muhammad Shah, Mumtaz (2021) Adsorptive removal of COD from produced water using tea waste biochar. Environmental Technology & Innovation, 23. art. no. 101563. pp. 1-17. ISSN 2352-1864


This study was conducted to explore the effectiveness of tea waste (TW) biochar (BC) as an adsorbent for the oxidizable organic contaminants measured as chemical oxygen demand (COD) in produced water (PW). BCs were prepared by modifying the TW with single (pre-pyrolysis) and combined (pre and post pyrolysis) treatments using phosphoric acid and hydrogen peroxide solutions. Based on FTIR, XPS, XRD and BET characterizations, the combined modified BC had higher oxygen-containing functional groups (-OH and -COOH), surface area (82 ± 0.50 m2/g) and pore volume (0.08 ± 0.001 cm 3/g) compared to single modified BC (60 ± 0.50 m2/g, 0.02 ± 0.002 cm 3/g). The Langmuir monolayer adsorption model best fitted both BCs with separation factor < 1, showing favorable adsorption process. The controlling mechanism of the adsorption process was best described by the pseudo-second-order kinetic model with a coefficient of determination value of 0.995. The particle diffusion mechanism was demonstrated by the Weber–Morris plot. Taguchi method was used in Minitab 19 for optimization of operating factors i.e., pH, contact time and BC dosage. Maximum COD removal efficiencies were found to be 89.35 ± 0.5% and 95.5 ± 0.5% for single and combined modified BCs, respectively. The study provides a successful approach towards high level of COD removal from PW while reducing the waste generation and protecting the environment.

Download File

Full text not available from this repository.

Additional Metadata

Item Type: Article
Divisions: Institute of Advanced Technology
DOI Number: https://doi.org/10.1016/j.eti.2021.101563
Publisher: Elsevier
Keywords: Biochar; Organic pollutants; COD; Adsorption; Produced water
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 05 Apr 2023 03:53
Last Modified: 05 Apr 2023 03:53
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.eti.2021.101563
URI: http://psasir.upm.edu.my/id/eprint/95717
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item