Characteristics of phosphorus adsorption by magnetic lobster shell
LIANG Yue-gan1, FANG Tao1, LI Wei1, BAO Jing1, LIU Bo1, LUO Pei-wen1, ZHANG Liu2, YUAN Bu-xian2
1. Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China;
2. Anhui Institute of Environmental Science, Hefei 230071, China
The characteristics of phosphorus adsorption were studied by using magnetic modified-lobster shell. The results showed that the highest efficiency of phosphorus removal occurred at the adsorbent dosage of 4g/L, and above 91.6% phosphorus was removed in the wastewater with the phosphorus concentration lower than 20mg/L by magnetic modified-lobster shells, and their ability of removing phosphorus was suitable to a wide range of pH. The co-existing ions (Cl-, SO42-, NO3- and HCO3-) had a little influence on the phosphorus removal ability, and whereas HCO3- ion had a slightly negative effect on phosphorus adsorption. Freundlich equation could well describe the adsorption behaviour of phosphorus of magnetic modified-lobster shells, and the adsorption process followed the quasi-second-order kinetic model. Thermodynamic analysis showed that the adsorption process was spontaneous. The main mechanisms of phosphorus adsorption by magnetic modified-lobster shells were ligand exchange, electrostatic interaction and surface precipitation according to X-ray diffraction and FTIR analyses.
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