Waste‐derived nanomaterials for environmental remediation: Laboratory research versus real‐world application

Abstract

Waste‐derived nanomaterials represent a viable solution for environmental remediation by converting industrial, agricultural/farming, and municipal wastes into high‐performance materials for wastewater treatment. They are critically reviewed in terms of synthesis using heterogeneous feedstocks, laboratory‐scale effectiveness in dye, heavy metal, and pharmaceutical pollution removal using adsorption, photocatalysis, and catalysis, and the gaps that remain to be resolved in scalability, practical performance, toxicity, and economic feasibility. Conventional processes are only expensive, produce sludge, and cannot effectively compete with recalcitrant contaminants, whereas nanomaterials can enhance removal rates by up to 90% under controlled conditions due to their high surface area, controlled chemistry, and reactivity. The reality of competing ions in matrices, organic matter, pH changes, and long‐term functioning, however, reflects less stability and leaching threats, as well as secondary pollution, which impede commercialization. This review emphasizes the significant industrial potential of nanomaterials derived from waste as sustainable and economical options for advanced wastewater treatment. By transforming various types of industrial, agricultural, and municipal waste into functional nanomaterials, industries and policymakers can tackle waste management issues. Unlike previous studies that mainly address efficiency at the laboratory level, this research highlights the disparity between experimental success and practical application by thoroughly investigating the variability of feedstocks, the stability of nanomaterials, leaching effects, toxicity concerns, scalability, economic feasibility, and life‐cycle sustainability.