Effective Treatment of Nutrients by Adsorption onto the Surface of a Modified Clay and a Toxicity Evaluation of the Adsorbent
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- 作者：Soonjae Lee ; Kyu-Sang Kwon ; Jae-Chun Ryu ; Mi-Kyung Song…
- 关键词：Phosphate ; Clay ; Surface modification ; Adsorption ; Toxicity
- 刊名：Water, Air, and Soil Pollution
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：226
- 期：4
- 全文大小：1,197 KB
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16. Johir, MAH, George, J, Vigneswaran, S, Kandasamy, J, Grasmick, A (2 - 刊物类别：Earth and Environmental Science
- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Terrestrial Pollution
Hydrogeology - 出版者：Springer Netherlands
- ISSN：1573-2932
文摘
A pure clay ball and surface-modified clay ball were investigated to remove phosphate from synthetic wastewater; phosphate causes eutrophication in hydro-ecological systems. Adsorption tests of phosphate from aqueous solutions onto two types of adsorbents were conducted. The maximum phosphate adsorption capacities of the pure and surface-modified clay ball were found to be 0.084 and 8.869?mg/g, respectively. In a fixed-bed column packed with surface-modified clay balls, the first breakthrough of phosphate appeared after approximately 4000?min. In addition, the phosphate adsorbed on the surface-modified clay ball was effectively desorbed using a 1?M zirconium sulfate solution, and the adsorbent was regenerated for four adsorption and three desorption cycles by maintaining the adsorption capacity at the value before regeneration. X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), and Brunauer-Emmett-Teller (BET) analysis method were performed to reveal the characteristics of the surface-modified clay ball. Cytotoxicity experiment was conducted on the developed adsorbents, and as a result, these showed low cytotoxic effect on the human cells. These results indicated that the surface-modified clay ball, due to the low cost, high adsorption capacity, and non-toxicity, has the potential to be utilized in the cost-effective removal of phosphate from aqueous solutions.