NGAHNational Groepering Ambulante Handel (Dutch: National Ambulatory Trade Group; professional association)
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Since Table 4 also shows rates of E (sorption average energy) greater than 8 kj mol"1, the occurrence of chemical adsorption between adsorbate / adsorbent was again suggested (WAN NGAH et al.
Moreover, negative AG rates indicate the spontaneous nature of the reaction, whereas positive AS rates demonstrate an increase in disorder and randomness of the solid/solution interface during the sorption process, as occurred in the biosorbents under analysis (WAN; NGAH HANAFIAH, 2008).