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Modified Chitosan Beads Used as an Adsorbent of Soluble Metal Working Fluid

Pornpimon Jarupanavet, Kowit Piyamongkala


งานวิจัยนี้ศึกษาการบำบัดน้ำมันหล่อเย็นชนิดผสมน้ำด้วยกระบวนการดูดซับแบบแบตซ์ในระดับห้องปฏิบัติการ โดยได้แบ่งการทดลองออกเป็น 2 ส่วน ส่วนแรก ศึกษาความสามารถและร้อยละการดูดซับของตัวดูดซับที่แตกต่างกัน 3 ชนิด ได้แก่ ผงไคโตซาน เม็ดไคโตซาน และเม็ดไคโตซานดัดแปร ส่วนที่สอง ศึกษาปริมาณเม็ดไคโตซานดัดแปรที่เหมาะสมสำหรับการดูดซับน้ำมันหล่อเย็นชนิดผสมน้ำ จากการศึกษาสมบัติทางเคมีด้วยการวิเคราะห์ประจุที่ผิวเป็นศูนย์ของตัวดูดซับ เพื่อตรวจสอบค่าความเป็นกรด-เบสที่ทำให้ผลรวมของประจุบนพื้นผิวตัวดูดซับเท่ากับศูนย์ สำหรับการดูดซับน้ำมันหล่อเย็นชนิดผสมน้ำที่มีค่าความเป็น-เบสเท่ากับ pH 8.90 พบว่า ผงไคโตซาน เม็ดไคโตซาน และเม็ดไคโตซานดัดแปรมีค่าประจุที่ผิวเป็นศูนย์เท่ากับ pH 8.90, 4.10 และ 1.98 ตามลำดับ การใช้ตัวดูดซับปริมาณเท่ากันที่ 2.0 กรัม และความเข้มข้นเริ่มต้นน้ำมันหล่อเย็นเท่ากับ 11,540 มิลลิกรัมต่อลิตร พบว่า เม็ดไคโตซานดัดแปรมีร้อยละการดูดซับสูงสุดเท่ากับ 100 ขณะที่ผงไคโตซาน และเม็ดไคโตซานมีร้อยละการดูดซับเท่ากับ 0 และ 19 ตามลำดับ เนื่องจาก ประจุที่ผิวของเม็ดไคโตซานดัดแปรมีโปรตอนของกรดไฮโดรคลอริกที่ใช้ในการดัดแปรมาเกาะที่ผิวของเม็ดไคโตซานดัดแปร ไอโซเทอมการดูดซับสอดคล้องกับสมการฟรุนดิช

The adsorption soluble metal working fluid was studied in the batch adsorption at laboratory scale. The experiment was divided into 2 parts. The first part involves investigation of the adsorption capacity and adsorption percentages of chitosan powder, chitosan beads and modified chitosan beads. The second part encompasses effects of the amount of adsorbents on the adsorption process of the soluble metal working fluid. The point of zero charge was used to describe the pH where the net charge of total particle surface of adsorbents is equal to zero. The pH of soluble metal working fluid was 8.90. It was found that the point of zero charge of chitosan powder, chitosan beads and modified chitosan beads were 8.90, 4.10 and 1.98, respectively. When adsorbent doses of each category were all set at 2.0 g with initial soluble metal working fluid of 11,540 mg/L, the adsorption percentage of modified chitosan beads reached 100% while that of chitosan powder and chitosan beads were 0 and 19 %, respectively. Modified chitosan beads show greater adsorption capacity because their surface charge contains protons from hydrochloric acid. The adsorption isotherm was found to correspond to the Frundish equation.


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DOI: 10.14416/j.kmutnb.2024.01.004

ISSN: 2985-2145