Hadi Erfani is a Chemical and Environmental Engineer, researcher, inventor, and sustainability specialist from Iran with expertise in environmental science, waste management, sustainable development, recycling technologies, and advanced materials for environmental protection. He obtained his Master of Engineering in Chemical Engineering (Environment) from the Central Tehran Branch of Islamic Azad University, Iran, where his research focused on evaluating the operational performance of compost plants for sustainable waste management. He also holds a Bachelor of Engineering in Chemical Engineering (Petrochemical) from Payame Noor University, Iran. His research interests include environmental science, waste management, sustainable development goals (SDGs), recycling technologies, circular economy, water treatment, pollution control, biochar applications, additive manufacturing, and green chemical engineering. He has authored a book titled Introduction to E-Waste Optimization Management and translated Introduction to Scientific Research Projects into Persian. He has published numerous peer-reviewed articles in internationally recognized journals covering environmental monitoring, wastewater treatment, oil-water separation, air pollution control, agricultural waste management, composting, 3D printing with recycled materials, metal-organic frameworks, and sustainable manufacturing technologies. Dr. Erfani actively contributes to the scientific community as a reviewer for numerous international journals, including Environmental Development, Environmental Quality Management, Discover Applied Sciences, Sustainable Chemistry and Pharmacy, Discover Environment, Arabian Journal of Chemistry, Environmental Monitoring and Assessment, and several other leading journals in environmental science and engineering. He has also served as a speaker at international conferences, including the World Recycling Convention, the Royal Society of Chemistry Poster Conference, and the International Conference on Interdisciplinary Research for Sustainable Development. His professional experience spans research, editorial, engineering, and international scientific service. He has served as a Humanitarian Ambassador with the United Nations Development Programme (UNDP), Reviewer Board Member for the American Society for Engineering Education, Young Editorial Board Member for Pharmacoeconomics and Policy, Editorial Board Member for Bilingual Publishing Group, Academic Researcher at Islamic Azad University, Researcher at the International Academy of Science, Technology Engineering and Management, Research and Development Engineer at Pishgaman Pardis, Judge for the World Invention Competition and Exhibition Malaysia, Global Judging Committee Member for the Global Youth Challenge for Human Development, Council Member of the EQORIA Earth Consortium, and Lead Guest Editor for Science Publishing Group. An accomplished inventor, Hadi Erfani has contributed to several patented technologies, including Filament Glue for the 3D Printer Industry, Multifunctional Test Tube, and Method for 3D Printing Model Using Acrylonitrile Butadiene Styrene Polymer. His research projects focus on sustainable waste management, recycling technologies, climate change mitigation, environmentally friendly materials, and innovative solutions for additive manufacturing. His contributions have been recognized with numerous national and international awards, including the Top Scientist recognition by the AD Scientific Index, Gold Medal of Recognition from the Global Sustainable Futures Network (GSFN), Gold, Silver, and Bronze Medals at international invention exhibitions including INTARG and the Beirut International Innovation Show, and invitations as keynote speaker and conference presenter at several global scientific events. His multidisciplinary work continues to advance sustainable engineering, environmental protection, circular economy solutions, and innovative technologies for global environmental challenges.      

Title : The Impact of PLA Materials on the Economic Cycle and its Recycling in 3D Printers -  Abstract :  The presented study introduces an environmentally friendly PLA-based adhesive system for 3D printers designed to overcome the limitations of conventional adhesives. Traditional adhesives often contain hazardous chemicals that may negatively affect human health, particularly the respiratory system, while also contributing to environmental pollution due to their poor degradability. The proposed plant-based adhesive offers a sustainable alternative with a simple yet effective structure, high bonding performance, and the ability to be naturally replenished and recycled without generating harmful waste. The innovation supports improved printing quality, enhanced material adhesion, and greater compatibility with modern 3D printing technologies. The use of renewable raw materials and recyclable PLA contributes to reducing dependence on petroleum-based resources while lowering greenhouse gas emissions associated with conventional plastic production. As polylactic acid is biodegradable and compatible with living tissues, it offers significant environmental and industrial advantages for applications involving packaging, manufacturing, and additive manufacturing. The proposed technology promotes sustainable industrial development by improving product performance, reducing waste generation, protecting human health, and supporting circular economy principles. Its industrial applications extend across chemical engineering, materials science, and additive manufacturing, demonstrating the potential of renewable materials to replace conventional petroleum-based plastics. The study highlights that expanding the production and application of PLA-based materials can significantly contribute to environmental protection, resource conservation, and sustainable manufacturing practices. Keywords: PLA, Recycling, Economic Cycle, 3D Printer, Materials