| Summary: | Heavy metals like nickel, chromium and copper have been excessively released into the environment due to rapid industrialization, which can cause a significant global concern. Despite numerous research on the removal of heavy metals, this study focuses on the application of glutaraldehyde-crosslinked chitosan (GCC) beads as highly effective bioadsorbents for the separation of nickel ions (Ni (II)). With increasing the extent of glutaraldehyde-crosslinking, the GCC beads showed enhanced adsorption selectivity and capacity toward Ni (II). The effects of pH, agitation speed, contact time, adsorbent dose, and initial metal ion concentration were studied in batch adsoiption systems. Under the optimum conditions, the adsorbent shows 91.97% for Ni (II) removal with good reusability till the third cycle. After eight cycles, adsorption capacity of GCC showed no noticeable decline. This study provides an economical approach as a sorbent for removing heavy metals from water. © 2025 American Institute of Physics Inc.. All rights reserved.
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