Abstract
The main idea to conduct this study is the treatment of hazardous arsenite (As+3) and arsenate (As+5)from water by two efficient adsorbetns i.e. polyacrylonitrile fiber (organic) and iron ore (inorganic). Polyacrylonitrile (PAN) fibers were chemically modified prior to loading iron using a solution of diethylenetriamine and aluminum chloride hexahydrate. The characterization of PAN fibers was performed through FTIR spectroscopy, which shows the binding of functional groups on PAN fibers surfaces. Atomic absorption spectrometer (AAS) was used to analyze arsenic concentration in samples. The impact of pH, dosage, shaking (contact) time and shaking speed was studied and parameters were optimized for further study. The highest adsorption of 98% is exhibited by modified PAN fiber for As+5 while for As+3 removal is 80%. Modified PAN also showed higher adsorption capacity of 42×103μg/g for As+5 which is better than the As+3 adsorption capacity 33×103 μg/g. Overall results demonstrated that MPAN adsorbent is better than the iron ore adsorbent for the treatment of both As+3 and As+5. Comparative studies of PAN Fiber and iron ore adsorbents revealed that PAN fibers had better adsorption properties than iron ore for As+3 and As+5 in terms of percentage removal and capacity.
Highlights
IntroductionAmong the wide range of pollutants available in water, arsenic is one of the most unwanted pollutant that causes water quality to decrease [3,4,5]
All forms of life on Earth can only be maintained with water because water is an indispensable commodity on Earth
The results demonstrated that when As+3 was initially used, the raw PAN showed a 72% elimination, but As+3 adsorption was enhanced with modified polyacrylonitrile (MPAN) adsorption to 78%
Summary
Among the wide range of pollutants available in water, arsenic is one of the most unwanted pollutant that causes water quality to decrease [3,4,5]. Drinking water quality is affected by toxic metal contamination of As+3 and As+5. It is reported that arsenic is a deadly factor in more than 70 countries, which causes serious health problems worldwide [6]. More than 150 million people worldwide are involved in arsenic-related health problems. People in Pakistan, Vietnam, Nepal, China, India, Myanmar, and Cambodia drink water contaminated with arsenic [8]. The concentration of arsenic in food is another problem causing health issues in the world [10]. One of the main requirements for sustaining life on earth is clean water availability. As the world's population increases, the need for contaminated free drinking water is increasing [11]
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