Utilizing metakaolin and siliceous waste from the alum industry to create geopolymer adsorbent for the removal of certain heavy metals
Khaled Elewa, A. F. Tawfic, Mostafa Tarek, Nabil Abdullah Al-Sagheer, Nabil M. Nagy
TL;DR
This paper shows how industrial waste can be turned into a material that effectively removes heavy metals like lead, cadmium, and chromium from polluted water.
Contribution
The novel use of partially dealuminated kaolin waste to synthesize a geopolymer for heavy metal adsorption from wastewater.
Findings
The geopolymer achieved 100% removal of Cr, Cd, and Pb under optimal conditions.
High adsorption capacities were observed for Pb (105.6 mg/g), Cd (150 mg/g), and Cr (125 mg/g).
The adsorption process followed pseudo-1st-order kinetics with high correlation coefficients.
Abstract
A geopolymer (GP) from Partially Dealuminated Kaolin (PDK) was synthesized. PDK is a solid waste of alum industry, it was produced in a big quantity, which need careful management to be recycled for protection of the environment against pollution. Utilization of PDK is very lacking, and there were no studies for using in the preparation of geopolymer as an adsorbent for heavy metal removal from wastewater. GP was used for the removal of Cr, Cd, and Pb from synthetic industrial wastewater by the adsorption technique. FTIR spectrum indicates a peak at 977 cm−1 due to Si–O–Si and Si–O–Al bonds confirming the formation of geopolymer. The effects of various parameters such as temperature, pH, contact time, and metal ion concentration were tested to stand over the most favorable conditions for adsorption. A total of 100% removal was achieved at a pH = 6.0, temperature = 25 °C, and initial…
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Taxonomy
TopicsConcrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production · Clay minerals and soil interactions