Mohd Fairuz Farah Shahirah, Md Muslim Noor Zuhartini, Wan Abdullah Wan Nazwanie, Mohd Shohaimi Norshahidatul Akmar, Abdullah Nor Hakimin, Ab Halim Ahmad Zamani, Mohd Shukri Nurasmat, Muhamad Salleh Nur Fatien
School of Health Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian, Kelantan 16150, Malaysia.
School of Chemical Sciences, Universiti Sains Malaysia, Pulau Pinang 11800, Malaysia.
Langmuir. 2024 Sep 11. 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 μg/L of As solution for 60 min of contact time at a pH of 5.5 ± 0.5 and a temperature of 40 °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.
水源被重金属污染物砷（As）污染会给人类、动物和其他生物带来重大风险。因此，引入去除砷的方法很重要。本研究旨在探讨利用天然土壤吸附剂去除砷的吸附模型和机制。采用批量吸附技术分析了接触时间、初始砷浓度、pH值和温度等各种参数的影响。通过吸附动力学、等温线和热力学模型研究了吸附机制。批量吸附研究结果表明，在pH值为5.5±0.5、温度为40℃的条件下，将2.2 g吸附剂应用于50μg/L的砷溶液中60分钟，可实现最大程度去除砷的最佳条件。使用红壤作为吸附剂时去除效率最高。动力学、等温线和热力学模型表明，砷的吸附是一个化学吸附、非自发和吸热的过程。
