What question did this study set out to answer?

The aim is to synthesize activated carbons from peanut shells to improve CO2 capture efficiency.

March 10, 2026

Valorization of Peanut Shell Biomass Into Sustainable Microporous Activated Carbons by H 3 PO 4 Activation for Enhanced CO 2 Capture

Key Points

The aim is to synthesize activated carbons from peanut shells to improve CO2 capture efficiency.
Synthesis of activated carbons using H3PO4 activation and carbonization at 750°C
Characterization of adsorbents using techniques like X-ray diffraction and FT-IR
Evaluation of CO2 uptake capacity and textural properties
Assessment of recyclability through multiple adsorption-desorption cycles
Analysis of dynamic CO2 adsorption behavior with kinetic models.
Activated carbon PNC7 showed CO2 uptake performance of 3.87 mmol/g
Micropore surface area measured at 1195 m2/g and micropore volume at 0.79 cm3/g
High recyclability demonstrated over ten consecutive cycles
Effective CO2 adsorption characterized by pseudo first and second-order kinetic behaviors.

Abstract

ABSTRACT Here in this current research, sustainable activated carbons (ACs) were synthesized from peanut (PN) shells using an H 3 PO 4 activating agent in various percentages through a simple impregnation method, followed by carbonization at 750°C in N 2 flow. Furthermore, the resulting ACs was examined for their CO 2 uptake capacity. Among all the prepared ACs, activated carbon adsorbent PNC7 showed superior CO 2 uptake performance about 3.87 mmol/g at atmospheric pressure and 25°C conditions. Several factors contributed to the high CO 2 uptake, including a large micropore surface area (1195 m 2 /g), a large micropore volume (0.79 cm 3 /g), narrow pore size (0.75 nm), and more abundant basic oxygen functional groups. The significant high surface area was explained by I D /I G values and it was 1.31 for PNC7 activated carbon. In order to determine the textural properties of the ACs, a variety of characterization techniques were used, including x‐ray diffraction, Fourier‐transform infrared spectroscopy (FT‐IR), x‐ray photoelectron spectroscopy (XPS), N 2 adsorption and desorption, Field emission scanning electron microscopy (FE‐SEM), Raman, and CHNS elemental analysis. In addition, the adsorbent PNC7 demonstrated excellent recyclability during adsorption‐desorption up to ten consecutive cycles along with high CO 2 uptake. Furthermore, the dynamic CO 2 adsorption behavior was evaluated using kinetic models such as pseudo first, second, and avrami kinetic model.

Mark Helpful

Bookmark

Relay