Synergistic effect of adsorption and photolysis on methylene blue removal by magnetic biochar derived from lignocellulosic biomass.

Bioresour Technol

Department of Wood Science and Engineering, Chonnam National University, Gwangju, Korea; Interdisciplinary Program in IT-Bio Convergence System, Chonnam National University, Gwangju, Korea. Electronic address:

Published: September 2024

AI Article Synopsis

  • A study synthesized magnetic biochar by adding FeO to biochar, confirming its properties through advanced techniques like Raman and X-ray photoelectron spectroscopy.
  • The magnetic biochar demonstrated a higher recovery rate of methylene blue (MB) at 97.07%, but had a lower maximum adsorption capacity compared to regular biochar.
  • Optimal conditions for MB removal were found to be 10-20 mg/L concentration, 1 g biochar, pH 12, and a 30-minute duration, with magnetic biochar showing effective removal under visible light due to a combination of adsorption and photolysis.

Article Abstract

In this study, magnetic biochar was synthesized by doping FeO onto the biochar surface followed by analysis of its properties. The efficiency of methylene blue (MB) removal through the combined processes of adsorption and photolysis was assessed. The presence of FeO on the biochar surface was confirmed using Raman spectroscopy and X-ray photoelectron spectroscopy. The magnetic biochar, after MB adsorption, showed a magnetism of 39.50 emu/g leading to a 97.07 % recovery rate. The specific surface area of biochar was higher (380.68 m/g) than that of magnetic biochar (234.46 m/g), and the maximum adsorption capacity of MB was higher in the biochar (0.03 mg/g) than that in magnetic biochar (0.02 mg/g) under the optimal conditions for MB adsorption. The MB adsorption experiments using biochar or magnetic biochar were optimally conducted under 10-20 mg/L MB concentration, 1 g biochar dosage, pH 12, 200 rpm rotation speed, 25 °C temperature, and 30 min duration. Under dark conditions, biochar had a higher MB removal rate, at 83.91 %, compared to magnetic biochar, at 78.30 %. Under visible light (λ > 425 nm), magnetic biochar effectively removed MB within 10 min, highlighting the synergistic effect of adsorption and photolysis. MB is physically and chemically adsorbed by the monolayer on the surface of EB and EMB according to adsorption behavior.

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Source
http://dx.doi.org/10.1016/j.biortech.2024.131124DOI Listing

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