Removal of Pb2+ from aqueous solution by adsorption on chemically modified muskmelon peel

Kai Huang, Hongmin Zhu

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


A cost-effective biosorbent was prepared by a green chemical modification process from muskmelon peel by saponification with alkaline solution of Ca(OH)2. Its adsorption behavior for lead ions was investigated and found to exhibit excellent adsorption properties. Results showed that the optimal equilibrium pH range for 100 % adsorption is from 4 up to 6.4. Adsorption equilibrium was attained within 10 min. The adsorption process can be described well by Langmuir model and pseudo-second-order kinetics equation, respectively. The maximum adsorption capacity for lead ions was found to be 0.81 mol/kg. Pectic acid contained in the muskmelon peel is the main factor responsible for the uptake of lead ions onto the gel, and the chemical modification process presented in this study can be assumed effective to prepare other similar biomaterials. The large adsorption capacity and the fast adsorption rate indicated that chemically saponified muskmelon peel gel in present study has great potential to be used as a cost-effective adsorbent for the removal of lead ions from the water.

Original languageEnglish
Pages (from-to)4424-4434
Number of pages11
JournalEnvironmental Science and Pollution Research
Issue number7
Publication statusPublished - 2013 Jul


  • Adsorption
  • Lead ions
  • Muskmelon peel
  • Pectic acid
  • Saponification


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