Kinetics, Thermodynamics, and Mechanistic Studies of Arsenic Removal Utilizing Natural Soil as Adsorbent

• Published in: LANGMUIR
• Main Authors: Mohd Fairuz, Farah Shahirah; Md Muslim, Noor Zuhartini; Abdullah, Wan Nazwanie Wan; Shohaimi, Norshahidatul Akmar Mohd; Abdullah, Nor Hakimin; Ab Halim, Ahmad Zamani; Mohd Shukri, Nurasmat Mohd; Salleh, Nur Fatien Muhamad
• Format: Article
• Language: English
• Published: AMER CHEMICAL SOC 2024
• Subjects: Chemistry; Materials Science
• Online Access: https://www-webofscience-com.uitm.idm.oclc.org/wos/woscc/full-record/WOS:001312763200001
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/acs.langmuir.4c02309

The contamination of water sources with the heavy metal contaminant arsenic (As) causes substantial risks to humans, animals, and other living organisms. Therefore, the introduction of methods for the removal of As is important. The present study aimed to investigate the adsorption model and mechanism of As removal utilizing natural soil adsorbents. The batch adsorption technique was used to analyze the impacts of various parameters such as contact time, initial As concentration, pH, and temperature. Adsorption mechanisms were studied through adsorption kinetic, isotherm, and thermodynamic models. The batch adsorption study findings indicate that the optimal conditions for maximum As removal were achieved by application of 2.2 g of adsorbents in 50 mu g/L of As solution for 60 min of contact time at a pH of 5.5 +/- 0.5 and a temperature of 40 degrees C. The highest removal efficiency was achieved when red soil was employed as the adsorbent. The kinetic, isotherm, and thermodynamic models revealed that As adsorption was a chemisorptive, nonspontaneous, and endothermic process.