by Jimoh Muktar  and Toyese Oyegoke

Received: 31 December 2025;  Published: 30 April 2026;  doi: 10.21926/aeer.2602008

The growing concerns over fossil fuel dependency have motivated the exploration of sustainable biofuel alternatives. However, the practice of utilizing first-generation bioethanol production obtained majorly from food crops threat food supply market and poses threat to food security and land use. As a way forward, second-generation bioethanol from biomass, such as rice husk, an abundant agricultural residue, could potentially offer a promising pathway. Yet, its conversion remains energy-intensiv [...]

by Aster Woldu Gebrearegay  , Melaku Tesfaye  and Alemu Gizaw

Received: 04 January 2026;  Published: 24 April 2026;  doi: 10.21926/aeer.2602007

Hexavalent chromium (Cr(VI)) is a carcinogenic pollutant commonly found in wastewater from tanning and electroplating industries. This study investigates the efficiency of raw Cordia africana sawdust as a biosorbent for Cr(VI) removal. Batch adsorption experiments were conducted by varying pH (3-8), contact time (10-120 min), and Cr(VI) concentration (21-47 mg/L) using Response Surface Methodology (RSM) with Box-Behnken design. Characterization was performed using FTIR, SEM, [...]

by Takwa Tabbassi  , Asma Abdedayem  , Zohra Sghaier  , Amor Hafiane  and Mustapha Hidouri

Received: 15 December 2025;  Published: 10 April 2026;  doi: 10.21926/aeer.2602006

This study investigated the use of new bioadsorbent the Hydroxyfluorapatite (Ca₁₀(PO₄)₆OH_1.75F_0.25, HFA) to eliminate Alizarin Red S (ARS), a harmful water pollutant. Initial batch tests were conducted to evaluate the adsorption process, focusing on both kinetics and equilibrium behavior. Various kinetic models were applied such as: pseudo first-order, pseudo second order, the intra [...]