Published Paper Details:

Water scarcity is a critical global challenge, particularly in arid and semi-arid regions where conventional water resources are inadequate to meet growing demands. Atmospheric Water Harvesting (AWH) has emerged as a promising alternative water source by extracting moisture directly from ambient air. Among various AWH techniques, adsorption-based atmospheric water harvesting has gained increasing attention due to its ability to operate under low relative humidity conditions and its potential for energy-efficient operation. This paper presents a comprehensive review of adsorption-based atmospheric water harvesting systems with a focus on working principles, adsorbent materials, system configurations, and performance parameters. Various solid adsorbents such as silica gel, zeolites, metal-organic frameworks (MOFs), and composite materials are discussed with respect to water uptake capacity, regeneration temperature, and operational feasibility in arid climates. The advantages and limitations of adsorption-based systems are critically analyzed and compared with conventional condensation-based water harvesting methods. In addition, recent advancements, sustainability aspects, and challenges related to material cost, regeneration energy, and system scalability are highlighted. The study identifies key research gaps and emphasizes the need for low-cost, environmentally friendly adsorbents and passive or solar-driven regeneration techniques. This review aims to provide a consolidated understanding of adsorption-based AWH systems and serve as a reference for future research and practical implementation in water-stressed regions.