Organoclay vs conventional bentonite

When comparing organoclay vs conventional bentonite, their chemical properties highlight key differences, especially in ion exchange and surface electric.

Conventional bentonite features prominent ion exchangeability, where interlayer exchangeable cations (Na⁺, Ca²⁺, Mg²⁺, etc.) are replaceable by other solution cations, supporting its use in modification, pollutant removal, and drilling fluid control.

Its surface has permanent negative charges from isomorphous substitution (pH – independent) and variable charges at edges or functional groups, which regulate particle interactions and ion adsorption. Organoclay, however, undergoes organic modification that modifies its ion exchange profile—organic cations like quaternary ammonium salts occupy interlayer spaces.

This changes its surface charge characteristics, shifting from hydrophilic to lipophilic, resulting in distinct adsorption behaviors, particularly stronger affinity for organic pollutants compared to conventional bentonite.