This issue consists of 10 articles from 34 authors affiliated with 20 institutions from 7 countries including:

• Algeria (University of El Oued, University of Ouargla, University of Sidi Bel Abbès, Federal University of Viçosa, University of Jijel)
• Indonesia (Universitas Pendidikan Indonesia, Universitas Sultan Ageng Tirtayasa)
• United States (Virginia Commonwealth University)
• Nigeria (Federal University of Technology, University of Benin, Science and Education Development Institute, Federal College of Agriculture, Bamidele Olomilua University of Education, Rufus Giwa Polytechnic, University of Education, Science, and Technology)
• Sweden (Royal Institute of Technology)
• Mauritania (Institut National de Recherches en Santé Publique, Université de Nouakchott Al-Aasriya)
• India (Osmania University, ICSSR Major Project)

Articles

Aluminum Wastes Effect on Solar Distillation

Abdelkader Bellila, Abderrahmane Khechekhouche, Imad Kermerchou, Ali Sadoun, Antonio Marcos de Oliveira Siqueira, Nafila Smakdji

Teaching concept of bio-battery material: Use of Sweet Potato Peels and Lime Juice Solution

Rahma Maulida, Muhammad Naufal Daffa, Shafwa Faza Nadhira, Alin Parliana Hotimah, Sri Anggraeni, Asep Bayu Dani Nandiyanto, Hadi Sudarjat

Physicochemical Properties of Soil Ecosystem Polluted With Spent Engine Oil

Maximus M. Ebulue, C. S. Ebulue

Models for Elasto-electricity and Photovoltaic Material in the Micropower Plant

Lena J. T. Strömberg

Physicochemical Properties of Human Hair using Fourier Transform Infra-Red (FTIR) and Scanning Electron Microscope (SEM)

Ezenwali Moses Obinna

Conversion of Indonesian Coal Fly Ash into Zeolites for Ammonium Adsorption

Hesti Prihastuti, Teguh Kurniawan

Phytochemical Assessment of The Extracts of Stem (Bark) and Leaves of Theobroma Cocoa Materials: Experimental Procedure and Its Comparison to Literature

Francis Olawale Abulude, Mary Omofolarin Ogunkoya, Grace Bamise Adenibuyan, Kikelomo Mabinuola Arifalo, Akinyinka Akinusotu, Ademola Samuel, A. Adamu, Amoke Monisola Kenni, Lateef Johnson Bello

Preliminary Physico-Chemical and Phytochemical Study of Seeds of Balanites Aegyptiaca

Mohamed Moutaly, Abdoulaye Demba N’diaye

Bibliometric Analysis of Briquette Research Trends During the Covid-19 Pandemic

Dwi Novia Al Husaeni

Sustainable Urban Development Strategies for Slum Upgrading and Environmental Improvement using Material Science Technology

A. Bala Kishan, Mohd Akhter Ali, M. Kamraju