Temperature effect on chicken egg shell investigated by XRD, TGA and FTIR

Conference proceedings article

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Naemchan K., Meejoo S., Onreabroy W., Limsuwan P.

ผู้เผยแพร่: Trans Tech Publications

ปีที่เผยแพร่ (ค.ศ.): 2008

Volume number: 55-57

หน้าแรก: 333

หน้าสุดท้าย: 336

จำนวนหน้า: 4

ISBN: 9780878493562

นอก: 1022-6680

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-62949168354&partnerID=40&md5=69e710241905b19548eb10339054e284

ภาษา: English-Great Britain (EN-GB)

บทคัดย่อ

The chicken egg shell powders were annealed in air at the temperature range of 200-900ฐC for 4 h. The crystal structures were analyzed by x-ray diffraction (XRD), thermogravimetric analysis (TGA) and fourier transform infrared (FTIR). The natural phase was identified as calcite and no other crystalline species were detected in the annealing temperature range from room temperature up to 600ฐC. It was observed that the XRD peaks of calcite phase decreased and the new XRD peaks of CaO appeared after the chicken egg shells were annealed above 700 ฐC. At 900 ฐC, the chicken egg shells become porous, fragile and very white in color. CaO from the chicken egg shell was very sensitive to humidity and it was transformed to portlandite. The effects of heat treatment on the structure of chicken egg shell were carefully studied by Rietveld refinement method. TGA was used to monitor structural, thermal decompositions and phase transition from calcite to CaO. The FTIR spectra of chicken egg shell show that the relative intensities of CO3 2- absorption bands at the annealing temperature to that of room temperature increased. The OH absorption bands were observed at the annealing temperatures from 700-900ฐC. The results show that CaO obtained from chicken egg shell can be used as a moisture absorber for commercial application. ฉ 2008 Trans Tech Publications, Switzerland.

คำสำคัญ

CaCO3, Portlandite