Use of organo-clays in the removal of toxic organics from industrial wastewaters

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6488325

Srinivasan, K R; Fogler, H S

This study describes the development of organo-clays as cost-effective adsorbents for the removal of nonionic, toxic organics from wastewaters. Cetyl pyridinium montmorillonite (CPC-CLAY; an interlayer organo-clay) and Cetyl pyridinium hydroxy aluminum montmorillonite (CPC(HYDAL-CLAY; a predominantly external layer organo-clay) were prepared as model sorbents. Using pentachlorophenol (PCP) as the target organic molecule, our studies show that CPC-HYDAL-CLAY containing 12.0% by weight surface organic carbon is significantly more effective (about 10 times) than CPC-CLAY with 19.2% by weight surface organic carbon. Similar results were obtained with La-CPC-CLAY (12% organic carbon) and CPC-kaolinite (3.0% organic carbon), both of which exhibit surface orientation of organic carbon similar to that of CPC-HYDAL-CLAY. Specifically, the effectiveness of CPC-kaolinite establishes the idea that orientation of surface organic carbon may be as significant as the actual amount. All the three external surface oriented organo-clays studied here are comparable to activated carbon in their sorption potential for PCP. Electrokinetic and adsorption/desorption measurements reveal that in the cases of CPC-HYDAL-CLAY and La-CPC-CLAY, binding of CPC ion to the respective surfaces is of the high affinity and irreversible type and that the endpoint of adsorption may be in the form of a bidimensional aggregate or a ''hemimicelle''.

• OSTI ID: 6488325
• Report Number(s): CONF-871113-
• Resource Relation: Conference: American Institute of Chemical Engineers annual meeting, New York, NY, USA, 15 Nov 1987; Other Information: Technical Paper 57E
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
CLAYS
SORPTIVE PROPERTIES
ORGANIC CHLORINE COMPOUNDS
ADSORPTION
PHENOLS
WASTE WATER
DECHLORINATION
ADSORBENTS
ALUMINIUM COMPOUNDS
BINDING ENERGY
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
HYDROXY COMPOUNDS
KAOLINITE
MONTMORILLONITE
PYRIDINIUM COMPOUNDS
REMOVAL
TOXIC MATERIALS
WASTE PROCESSING
WATER POLLUTION CONTROL
WATER TREATMENT
ALUMINIUM SILICATES
AMINES
AMMONIUM COMPOUNDS
AROMATICS
AZINES
CHEMICAL REACTIONS
CONTROL
DEHALOGENATION
ENERGY
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LIQUID WASTES
MANAGEMENT
MATERIALS
MINERALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROCESSING
PYRIDINES
QUATERNARY COMPOUNDS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SORPTION
SURFACE PROPERTIES
WASTE MANAGEMENT
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)