Open AccessPENGARUH VALENSI KATION DALAM RUANG-ANTAR LAPISAN VERMIKULIT TERHADAP PEMBENTUKAN DAN KARAKTERISTIK KIMIA ALUMINIUMHIDROKSIVERMIKULIT
Author(s) -
Iskandar Iskandar
Publication year - 2005
Publication title -
jurnal ilmu tanah dan lingkungan/jurnal ilmu tanah dan lingkungan (journal of soil science and environment)
Language(s) - English
Resource type - Journals
eISSN - 2549-2853
pISSN - 1410-7333
DOI - 10.29244/jitl.7.1.6-10
Subject(s) - vermiculite , valence (chemistry) , clay minerals , diffractometer , materials science , particle size , chemical composition , thermal stability , molecular sieve , analytical chemistry (journal) , ion , chemistry , mineralogy , chemical engineering , scanning electron microscope , catalysis , composite material , organic chemistry , engineering
Aluminumhydroxy-smectite (AHS), known also as pillared clay, has some specific c...haracteristics such as: wide specificsurface area, high basal spacing, and stable at significant high temperature. The AHS was produced from smectite andpolymer aluminum-hydroxy. In industrial sector, this product can be used as cracking-catalyst, absorber, and molecular sieveup to 500°C. Similar product can be constructed from vermiculite, and the aluminumhydroxy-vermiculite (AHV) is predicted have a better thermal stability than AHS due to higher charge density of vermiculite that adsorb more aluminumhydroxy than that of smectite.Related to the above background the objectives of the research were to study the effects of cation valence in theinterlayer space of vermiculite using Li and Ml ions in the formation process and the chemical characteristics of AHV. Liand Mg-vermiculites with different particle sizes are reacted with polymer aluminum-hydroxy' at 100°C temperature.Solution of 2% Locron was used as source of aluminum-hydroxy. The products were characterized chemically andmineralogica/~v. The chemical characteristic includes total chemical analysis, whereas the mineralogical characteristiccomprises basal spacing identification that was measured with X-ray diffractometer (XRD). The results indicated that the AHVproducedfrom Li-vermiculite showed peaks of 1.86 nm and 1.41-1.45 nm with increasing intensity of the 1.86 nm peaks as the particle size was finer. The AHV produced from Mg-vermiculite showed only peak of 1.45 nm, whereas the 1.84 nm peak can on~v be identified as a shoulder. The AHV with peak of 1.86 nm (AHV-I.86) can keep its basal spacing to 1.68 nm after 3 hours heating at temperature of 700°C, whereas the AHV-I.45 nm shrinkages to 1.10/0.98 nm at the same treatments. Chemical analysis showed that the inter/oyer space of the AHV-I.86 consists more aluminum-hydroxy than that of the AHV-I.45. Ratio o(OH/AI o(the interlayer aluminum-hydroxy in the AHV-1.86 was 2.57, whereas that of the AHV-I.45 was 2.40.