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Experimental determination of Cd2+ adsorption mechanism on low-cost biological waste

Frontiers of Environmental Science & Engineering 2013年第3期7卷 356-364页

作者： Farhah Amalya ISMAIL Ahmad Zaharin ARIS Environmental Forensics Research Centre Faculty of Environmental StudiesUniversiti Putra MalaysiaUPM Serdang 43400Malaysia

carbonate shells have an astonishing ability in the removal of Cd2+in a short time period with emphasis on being a low cost *** the present study,the sorption capacity of carbonate shells was studied for Cd2+in batch *** infuence of different carbonate shell sizes and physico-chemical factors were evaluated and the results were analyzed for its correlation matrices by using Predictive Analytics Software(PASW).The mineralogy state of aqueous solution regarding the saturation index was simulated using PHREEQC to identify the Cd2+uptake *** Cd uptake rates were calculated as well as Ca2+,HCO–3concentration,pH,ambient humidity and temperature were ***2+removal of 91.52%was achieved after 5 h *** adsorption effciencies were signifcantly infuenced by pH as they increased with the increase of pH from acidic solution(5.50 0.02)to slightly alkaline(7.60 0.05).In addition,the mineralogy state of aqueous solution calculated from PHREEQC confrmed that the increment of Ca2+and HCO–3concentrations in solution was attributed to the dissolution of carbonate ***,the ion exchange adsorption mechanism of Cd2+toward Ca2+was identifed as the process involved in Cd2+uptake.

关键词： carbonate shell cadmium heavy metal adsorption mechanism saturation state

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Experimental determination of Cd^2＋ adsorption mechanism on low-cost biological waste

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Frontiers of Environmental Science & Engineering 2013年第3期7卷 356-364页

作者： Farhah Amalya ISMAIL Ahmad Zaharin ARIS Environmental Forensics Research Centre Faculty of Environmental Studies Universiti Putra Malaysia UPM Serdang 43400 Malaysia

carbonate shells have an astonishing ability in the removal of Cd^2＋ in a short time period with emphasis on being a low cost adsorbent. In the present study, the sorption capacity of carbonate shells was studied for Cd^2＋ in batch experiments. The influence of different carbonate shell sizes and physico-chemical factors were evaluated and the results were analyzed for its correlation matrices by using Predictive Analytics Software （PASW）. The miner- alogy state of aqueous solution regarding the saturation index was simulated using PHREEQC to identify the Cd^2＋ uptake mechanism. The Cd uptake rates were calculated as well as Ca^2＋, HCO3- concentration, pH, ambient humidity and temperature were measured. Cd2＋ removal of 91.52% was achieved after 5 h adsorption. The adsorption efficiencies were significantly influenced by pH as they increased with the increase of pH from acidic solution （5.50±0.02） to slightly alkaline （7.60±0.05）. In addition, the mineralogy state of aqueous solution calculated from PHREEQC confirmed that the increment of Ca^2＋ and HCO3- concentrations in solution was attributed to the dissolution of carbonate shells. Moreover, the ion exchange adsorption mechanism of Cd^2＋ toward Ca^2＋ was identified as the process involved in Cd^2＋ uptake.

关键词： carbonate shell cadmium heavy metal,adsorption mechanism saturation state

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