Application of Coal Fly Ash–Derived Zeolites for Batch Adsorption of Chromium from Wastewater

The application of coal fly ash has for decades been regarded as a viable method for the adsorption of chromium in contaminated water. However, coal fly ash as an adsorbent has its setbacks due to its limited number of adsorption sites, resulting in inadequate extraction efficiencies. In this work,...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2022-07, Vol.233 (7), Article 279
Main Authors: Mokgehle, Tebogo Mphatlalala, Nevhudogwa, Funanani Bridget, Tavengwa, Nikita Tawanda
Format: Article
Language:English
Subjects:
Adsorption
Ageing
Aging
Atmospheric Protection/Air Quality Control/Air Pollution
Chromium
Climate Change/Climate Change Impacts
Coal
Crystallization
Drinking water
Earth and Environmental Science
Environment
Environmental monitoring
Fly ash
Hydrogeology
Hydrothermal treatment
Influents
Silica
Silicon dioxide
Sodium hydroxide
Soil Science & Conservation
Temperature
Wastewater
Water pollution
Water Quality/Water Pollution
Zeolites
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Summary:The application of coal fly ash has for decades been regarded as a viable method for the adsorption of chromium in contaminated water. However, coal fly ash as an adsorbent has its setbacks due to its limited number of adsorption sites, resulting in inadequate extraction efficiencies. In this work, batch adsorption studies of chromium from wastewater were done using zeolites derived from coal fly ash. The hydrothermal treatment technique for synthesis of zeolites consisted of ageing and crystallization studies. The optimized conditions for ageing were a concentration of 2.5 M NaOH for the activating agent, aged for 48 h with the NaOH volume at 100 mL. Thereafter, crystallization studies were performed evaluating the effect of the H 2 O/SiO 2 ratio, crystallization time and crystallization temperature, where the optimum conditions were observed at 1, 72 h and 200 °C, respectively. The adsorption performance of these materials was evaluated with respect to mass of zeolite, influent concentration, contact time and temperature, where the optimized parameters were 80 mg, 0.9 M, 420 min and 75 ∘ C , respectively. In conclusion, application studies revealed that the chromium concentration in tap water from the studied municipality was below the detection limit, indicating that the water was adequately treated.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-022-05753-z