Fabrication of efficient surface ion-imprinted materials based on rice husk ash for Cu2+ ion detection in crafish and adsorption from tap water

Abstract

In light of the growing emphasis on circular economies and green chemistry, biosorbent-based detection and capture of Cu2+ ions are becoming increasingly important. This study fabrication of Cu2+ ion-imprinted materials (RHA-CIIM) was conducted using surface ion imprinting technology using MCM-41 derived from rice hull ash (RHA) as the support material. A comparison of RHA-CIIM and non-imprinted materials (RHA-CNIM) reveals that RHA-CIIM with low LOD of 4.03 μg/L has superior selectivity and sensitivity for Cu2+ ions in the NIR. Meanwhile, RHA-CIIM was able to detect Cu2+ ions in crayfish accurately with a relative standard deviation of 2.1%. Moreover, RHA-CIIM demonstrated 128.7 mg/g adsorption capacity for Cu2+ ions, indicating its potential as a Cu2+ ion adsorbent. Based on its adsorption properties, almost 101.7% of Cu2+ was removed from tap water samples. Furthermore, the adsorption kinetics was accurately described by the pseudo-second-order model, while the sorption isotherm conformed to the Langmuir model.