Kinetic and Isotherms Studies of Hexavalent Chromium Adsorption by Mimosa pigra L. Adsorbents
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Abstract
Hexavalent chromium is a dangerous substance to living things and can contaminate into soi and water. Disposal this substance is very important and can be done in several ways. Adsorption by using adsorbent made from weed is another way which getting a lot of attention nowadays. This study is aimed to produce adsorbent from modified Mimosa pigra L. and activated carbon from Mimosa pigra L. using ZnCl2 as an activated agent. BET isotherm of nitrogen adsorption was conducted to identify the surface area value of the adsorbents. Scanning electron microscope was used to analyze the surface morphology of the adsorbents. The results showed that the surface area of modified Mimosa pigra L. and activated carbon from Mimosa pigra L. are 406.20 and 796.75 m2/g, respectively. The batch adsorption method was used to study kinetic and isotherm adsorption of hexavalent chromium. The flame atomic absorption spectrophotometer was used to analyze the concentration of hexavalent chromium solution after adsorption. The result indicated that the kinetic model of the adsorption process of both adsorbents was found to follow a pseudo second order model. The adsorption quantity will enter into an equilibrium state after 60 minutes. The maximum adsorption value is 77.52 mg/g for the activated carbon from Mimosa pigra L. which correspond to its surface area and average pore size value. Therefore, the adsorption behavior of both adsorbents is fitted with the Langmuir isotherm model. The preparation of both absorbents can increase the adsorption efficiency and is another alternative way to treat wastewater and to utilize the Mimosa pigra L. to its benefits.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการเผยแพร่ในวารสารวิทยาศาสตร์และเทคโนโลยี มรย. นี้ ถือเป็นลิขสิทธิ์ของวารสารวิทยาศาสตร์และเทคโนโลยี มรย. หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือกระทำการใดๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษรจากวารสารวิทยาศาสตร์และเทคโนโลยี มรย. ก่อนเท่านั้น
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