A robust PHDI-crosslinked cellulose aerogel loaded with CaCO 3 for Congo red removal

Key Points

• The aim is to develop a cellulose aerogel loaded with calcium carbonate for efficient dye removal from water.
• Created a CaCO3/CA-PHDI aerogel through crosslinking and in situ mineralization.
• Tested the adsorption capacity for Congo red dye across a range of pH levels from 3 to 11.
• Evaluated the regeneration capability of the aerogel after dye removal.
• Achieved a Congo red adsorption capacity of 191.6 mg g−1.
• Demonstrated pH tolerance from 3 to 11.
• Showed more than 73% regeneration capability of the aerogel after multiple cycles.