by Ludmila Velichkina  , Yakov Barbashin  and Alexander Vosmerikov

Received: 10 October 2021;  Published: 01 December 2021;  doi: 10.21926/cr.2104004

The objective of this research was to analyze the effect of different concentrations of nitric and hydrochloric acids on the structural, acidic, and catalytic properties of a post-synthetic treated ZSM-5 type zeolite at various temperatures. The properties of zeolite catalysts were determined using different methods, such as the Brunauer-Emmett-Teller (BET) method for specific surface area, temperature-programmed desorption (TPD) of ammonia method for acidic properties, and a flow-through unit with fixed bed cataly [...]

by Lin Xie  and Donald Kirk

Received: 09 June 2021;  Published: 16 September 2021;  doi: 10.21926/cr.2103003

Fe-rich alloys have been widely studied as catalyst materials for the cathodic oxygen reduction reaction (ORR) in hydrogen fuel cells, and many have shown high activities. The stability of Fe-rich catalysts has also been researched, and some studies have shown promising results using an accelerated stress test (AST), which uses a potential cycling method. However, for commercial fuel cell applications, such as standby power systems, the catalyst has to tolerate a high potential for a long period, which can not be r [...]

by Minato Nakamura  and Yoshinori Murakami

Received: 17 August 2021;  Published: 13 September 2021;  doi: 10.21926/cr.2103002

The photocatalytic reaction involved in TiO2 photocatalysis was investigated using a microreactor coated with TiO2 film on the glass plate attached on one side of the microreactor. It was confirmed that the effect of H2O2 on the photocatalytic degradation efficiency of azo dyes (acid orange 7, acid red 151, and acid yellow 23) was dependent on the polymorphs (anatase and rutile) of TiO2 coated on the glass plate of the UV-irradiated microreactor. Scavengers of holes (KI) and electrons (p-benzoquinone) were added to [...]

by Shiping Wang  , Georg Bendt  and Stephan Schulz

Received: 24 May 2021;  Published: 16 July 2021;  doi: 10.21926/cr.2103001

One-pot synthesis of mesoporous hybrid material consisting of Mn-Co/CoO nanoparticles encapsulated in an N-doped graphene shell decorated with Mo2C nanoparticles (Mo2C-NC@Mn-Co/CoO) was reported. The Mn and Mo components synergistically refined the graphitized carbons due to the interactions with N and C atoms while promoting the stability of the Co/CoO nanoparticles. These components exhibited a beneficial effect on the dispersion of the active metal/metal oxide nanoparticles and the formation of a mesoporous stru [...]

by Rupesh Kumar Gupta  , Yash Kumar Tiwari  , Arpit Gupta  , Grinedge Yadav  and Swati Gupta

Received: 01 March 2026;  Published: 27 May 2026;  doi: 10.21926/aeer.2602011

The rapid urbanisation in developing countries has not only intensified land transformation but also significantly altered surface temperatures, thereby increasing climate vulnerability. Ahmedabad, one of India’s fastest-growing cities, has witnessed substantial urban growth over the past two decades and therefore requires an integrated approach to analyse land-use change, thermal dynamics, and future growth patterns. This study aims to analyse the spatial and temporal patterns of land use/land cover (LULC) changes [...]

by Pham Van Dinh  , Pham Van Toi  , Tuan-Dung Hoang  , Leu Tho Bach  and Pham Tuan Hung

Received: 24 December 2025;  Published: 25 May 2026;  doi: 10.21926/aeer.2602010

Municipal solid waste (MSW) landfills remain a major source of greenhouse gas emissions, leachate pollution, and land degradation, particularly in low- and middle-income countries where many sites operate beyond their design capacity. This study proposes an integrated and low-cost framework combining unmanned aerial vehicle (UAV) photogrammetry with environmental assessment to support landfill closure planning. Using the Da Mai landfill (Vietnam) as a case study, high-resolution orthomosaics and a digital surface m [...]

by Rupesh Kumar Gupta

Received: 12 February 2026;  Published: 19 May 2026;  doi: 10.21926/aeer.2602009

Rapid urbanization has remarkably altered land surface characteristics and thermal environments in Indian metropolitan cities, thereby increasing ecological pressure and urban heat risk. This study integrates assessments of land use and land cover (LULC) change and LST, and the UTFVI for Bangalore, India, using multi-temporal Landsat imagery and geospatial techniques, along with machine learning methods. LULC changes were studied and analyzed for 2000 and 2020, and a simulation to 2024 was performed, employing a Ra [...]

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-intensive and thermodynamica [...]

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, BET, pH, and PZC analysis before and aft [...]

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)6OH1.75F0.25, 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 intraparticular diffuision model and external diffusion model. The modeling results proved that the pseudo-second-order model best matched t [...]