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All three colloidal O - MWNTs exhibit strong adsorption affinities to the three test compounds ( with K ( OC ) values orders of magnitude greater than those of natural organic matter ) , likely resulting from strong nonhydrophobic interactions such as pi - pi electron donor - acceptor interactions and Lewis acid - base interactions .
 Chemical: Lewis acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Lewis acid