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| Adsorption of Acid Scarlet G by Eggshell Powder from Aqueous Solution |
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| KeyWord:eggshell powder; recycling; isothermal model; ionic strength |
| Author Name | Affiliation | | YANG Ru-yi | College of Environmental Science and Engineering, Anhui Normal University, Anhui Wuhu 241003, China | | ZAN Shu-ting | College of Environmental Science and Engineering, Anhui Normal University, Anhui Wuhu 241003, China | | GUO Fu-yu | College of Environmental Science and Engineering, Anhui Normal University, Anhui Wuhu 241003, China | | ZHOU Gang | College of Environmental Science and Engineering, Anhui Normal University, Anhui Wuhu 241003, China | | SU Nan-nan | College of Environmental Science and Engineering, Anhui Normal University, Anhui Wuhu 241003, China | | LI Jing | College of Environmental Science and Engineering, Anhui Normal University, Anhui Wuhu 241003, China |
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| Abstract: |
| China is the largest producer and consumer of eggs in the world and generates 4 million tons of eggshells annually. However, the utilization rate of eggshell in China is less than 1%. Eggshells contain large amount of calcium carbonate and trace amounts of magnesium, phosphorous and other micronutrients. The uses of eggshell are receiving extensive attentions all over the world. This study was designed to explore the application of eggshells in wastewater treatments. Surface microstructure, specific surface area, pore volume and pore radius of eggshell powder（ESP） were determined using scanning electron microscope（SEM）, laser diffraction particle size analyzer and surface area and pore size analyzer, respectively. Static adsorption experiment was conducted to investigate adsorption and influencing factors of acid scarlet G by ESP from aqueous solution. Adsorption process of acid scarlet G by ESP could be well described by Lagergren pseudo-second-order kinetic equation and better fitted to Freundlich isotherm model. The negative ΔH0 and positive ΔG0 revealed that the adsorption was an exothermic and physical sorption process that could not occurred spontaneously. The maximal removal rate and adsorption capacity of acid scarlet G by ESP were 70.34% and 0.78 mg·g-1, respectively. Solution pH and ionic strength were the most important factors influencing the adsorption process. Overall, ESP could be an alternative adsorbent for pre-treatment of acid scarlet G although its removal rate was limited. Developing an integrated utilization of ESP would expand applications of eggshell resources. |
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