Efficient removal of heavy metal ions in wastewater by using a novel alginate-EDTA hybrid aerogel

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Abstract

In this study, we prepared a novel calcium alginate-disodium ethylenediaminetetraacetate dihydrate hybrid aerogel (Alg-EDTA) by chemical grafting and vacuum-freeze-drying to remove heavy metal ions from wastewater. Experimental results show that the as-prepared Alg-EDTA adsorbent has a high affinity for heavy metal ions, such as Cd2+, Pb2+, Cu2+, Cr3+, and Co2+, and can adsorb > 85% of metal ions from the corresponding solution. Alg- EDTA also exhibits high selectivity toward Cd2+, and the maximum adsorption capacity for Cd2+ reached 177.3 mg/g, which exceeds the adsorption capacity of most reported Cd2+-adsorbents. Adsorbent regeneration can be achieved by a simple acid-washing process, and adsorption performance of Alg-EDTA remains stable after repeated use. All these findings indicate that Alg- EDTA has a promising prospect in the treatment of heavy metal ions wastewater.

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Wang, M., Wang, Z., Zhou, X., & Li, S. (2019). Efficient removal of heavy metal ions in wastewater by using a novel alginate-EDTA hybrid aerogel. Applied Sciences (Switzerland), 9(3). https://doi.org/10.3390/app9030547

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