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(a) UV-visible spectra of MB (10 ppm) absorbed by [BMIM][PF6]/CIM91(20%) in water. (b) Maximum absorbance of pristine CIM91 (circle), [BMIM][PF6]/CIM91 (10%) (triangle), [BMIM][PF6]/CIM91 (20%) (square), and [BMIM][PF6]/CIM91 (40%) (cross) in water over time.
