Evaluation of nitrate removal efficiency from aqueous solutions using modified biochar derived from coffee husk

Authors

  • Le Hong Minh Institute of Materials, Biology and Environment/Academy of Military Science and Technology
  • Vu Ngoc Toan Institute of Materials, Biology and Environment/Academy of Military Science and Technology
  • Nguyen Thi Thu Huong Institute of Materials, Biology and Environment/Academy of Military Science and Technology
  • To Phuong Linh Institute of Materials, Biology and Environment/Academy of Military Science and Technology
  • Le Thuy Trang Institute of Materials, Biology and Environment/Academy of Military Science and Technology
  • Le Xuan Dong Department of Military Science, Ministry of National Defense
  • Dang Thi Ngoc Chau Department of Military Science, Ministry of National Defense

Keywords:

Adsorption; Biochar; Coffee husk; Nitrate (NO₃⁻)-

Abstract

This study presents the fabrication and evaluation of the nitrate adsorption capacity of modified biochar derived from coffee husk. The coffee husks were initially pyrolyzed at 350 °C for 1 hour, then soaked in 1 M KOH solution for 24 hours, followed by a second pyrolysis step at 700 °C for 2 hours. The resulting biochar was characterized using FT-IR, BET, and SEM techniques, and its nitrate removal efficiency from aqueous solutions was investigated. The highest nitrate removal efficiency (82,38%) was achieved under the following conditions: pH 3, biochar dosage of 1,5 g/100 mL, nitrate concentration of 50 mg/L, and reaction time of 210 minutes. The pseudo-first-order kinetic model and the Langmuir isotherm model were applied to describe the adsorption behavior, showing good agreement with the experimental data.

Downloads

Download data is not yet available.

Downloads

Published

2025-08-25

Issue

Vol. 105 (2025)

Section

Chemistry, Biology & Environment