Preparation of konjac glucomannan/ZIF-67 hybrid aerogel and its adsorption properties for malachite green

Konjac glucomannan/zeolitic imidazole framework-67 (KGM/ZIF-67) hybrid aerogels were prepared as novel adsorbents to remove malachite green (MG) from aqueous solutions. The impacts of adsorption temperature, solution pH, and ionic strength on adsorption capacity were investigated. The results show that ZIF-67 coordinates with the molecular chain of KGM and modifies the KGM aerogel. The adsorption equilibrium time of KZ2 for MG is 150 min. The adsorption process follows the pseudo-second-order and Langmuir models, with a maximum adsorption capacity of 2891.30 mg·g−1 at 30 ℃. MG adsorption using the hybrid aerogels is a spontaneous and endothermic process. This research shows that hybrid aerogels prepared using KGM and ZIF-67 are promising for use in new water purification applications.