Abstract
The present article describes the adsorption behavior of some low cost adsorbents such as olive waste, maize cobs, bentonitic clay, wheat bran, coal ash and coffee waste, with respect to Pb2+, Cu2+ and Zn2+ ions. The batch method was used and parameters such as electrical conductivity, pH, contact time, adsorbent dosage and initial and final concentration of metal ions were studied. All used adsorbents were effective, but coal ash was most effective, with total removal for all ions of over 90%, with highest percentage removal from 99.2% for Zn2+ ions and 97.5% of Pb2+. Maize cob was an effective adsorbent with maximal percentage removal of 92.6% for Zn2+ ions, wheat bran had highest removal of 93.7% for Pb2+ ions as did olive waste, 97% for Pb2+ ions. Coffe waste offers considerable promise as a low-cost natural adsorbent with highest efficiency in removal of Pb2+ with 97.5% while bentonitic clay having a structure with net negative charge, which is neutralized by positively charged species, resulted also as an effective low cost adsorbent with max total removal from 92.7% for Pb2+ to 80.9% for Zn2+ ions.
Highlights
The present article describes the adsorption behavior of some low cost adsorbents such as olive waste, maize cobs, bentonitic clay, wheat bran, coal ash and coffee waste, with respect to Pb2+, Cu2+ and Zn2+ ions
Adsorbent The starting materials, maize cobs, wheat bran, and coffee waste were obtained commercially from Kosovo, coal ash was obtained from Thermo Power Plants in Kosovo, bentonitic clay from Vitia, Kosovo while olive waste were obtained from olive oil industry in Ulqin, Montenegro
Maize cob was an effective adsorbent with maximal percentage of removal of 92.6% for Zn2+ and 66% for Cu2+ ions
Summary
The present article describes the adsorption behavior of some low cost adsorbents such as olive waste, maize cobs, bentonitic clay, wheat bran, coal ash and coffee waste, with respect to Pb2+, Cu2+ and Zn2+ ions. Solid residues from corn production such as corn cobs can be used as raw materials in the production of adsorbents[30, 31] Wheat bran, another agricultural waste was studied for its adsorbent properties[32, 33]. In present study we’ve analyzed some low cost materials, olive waste, maize cobs, bentonitic clay, wheat bran, coal ash and coffee waste as potential adsorbents for removing of Pb2+, Cu2+ and Zn2+ ions from standard solutions
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