Guava seed as an adsorbent and as a precursor of carbon for the adsorption of acid dyes.
The guava seed (SEGUVE) was characterized by ultimate and proximate analysis. In SEGUVE the principal thermal effect occurred at 363 degrees C and this can be attributed to the cellulose degradation, which was the main component ( approximately 61%). The guava seed has an acidic character with a high content of bulk functional groups (CO) and these characteristics were affected by carbonization. Two samples of carbon were prepared from the seeds at 600 and 1000 degrees C without chemical activation. Adsorption of eight acid dyes belonging to the monoazo and anthraquinone class was studied at 25 degrees C. The non-carbonized SEGUVE adsorbed the acid dyes more efficiently than SEGUVE-C600 and SEGUVE-C1000 although the specific surface of the raw material SEGUVE was low.
Elizalde-González
María P
MP
Centro de Química, Instituto de Ciencias, Universidad Autónoma de Puebla, Puebla Pue, Mexico. melizald@siu.buap.mx
Hernández-Montoya
Virginia
V
D000143:Acids; D000327:Adsorption; D001673:Biodegradation, Environmental; D002244:Carbon / Q000378:metabolism*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D004055:Differential Thermal Analysis; D008956:Models, Chemical; D009584:Nitrogen; D031647:Psidium / Q000378:metabolism*; D012639:Seeds / Q000166:cytology / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry
D000143:Acids; D004396:Coloring Agents; D002244:Carbon; D009584:Nitrogen