Chitrakar Ramesh, Tezuka Satoko, Sonoda Akinari, Sakane Kohji, Ooi Kenta, Hirotsu Takahiro
Health Technology Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14 Hayashi-cho, Takamatsu 761-0395, Japan.
J Colloid Interface Sci. 2006 May 15;297(2):426-33. doi: 10.1016/j.jcis.2005.11.011. Epub 2005 Dec 7.
Phosphate adsorption from single electrolyte (NaH2PO4), phosphate-enriched seawater, and model wastewater was studied using amorphous zirconium hydroxide, ZrO(OH)2(Na2O)0.05 1.5H2O, as an adsorbent. Batch experiments were carried out to investigate the adsorption of phosphate. The effect of pH on phosphate adsorption from seawater showed that the uptake of phosphate increased with an increase in pH up to 6, and then decreased sharply with a further increase in pH of the solution. The equilibrium data of phosphate adsorption were followed with a Freundlich isotherm. The uptake of phosphate at the adsorbent/solution ratio 0.05 g/2 L was 10 and 17 mg-P/g for the phosphate-enriched seawater and the model wastewater, respectively. A much higher adsorptivity toward phosphate ions in seawater was observed on ZrO(OH)2(Na2O)0.05 1.5H(2)O than on other representative adsorbents based on layered double hydroxides of Mg(II)-Al(III), Mg(II)-Fe(III), and Ni(II)-Fe(III). The effective desorption of phosphate ions on ZrO(OH)2(Na2O)0.05 1.5H2O could be achieved using a 0.1 M NaOH solution. The usefulness of experimental data for practical applications in removing phosphate in seawater and wastewater is discussed.
使用无定形氢氧化锆ZrO(OH)2(Na2O)0.05 1.5H2O作为吸附剂，研究了其对单一电解质（NaH2PO4）、富磷酸盐海水和模拟废水中磷酸盐的吸附情况。进行了批量实验以研究磷酸盐的吸附。pH对海水中磷酸盐吸附的影响表明，在pH值升至6之前，磷酸盐的吸收量随pH值升高而增加，然后随着溶液pH值的进一步升高而急剧下降。磷酸盐吸附的平衡数据符合Freundlich等温线。在吸附剂/溶液比例为0.05 g/2 L时，富磷酸盐海水和模拟废水中磷酸盐的吸收量分别为10和17 mg-P/g。与基于Mg(II)-Al(III)、Mg(II)-Fe(III)和Ni(II)-Fe(III)层状双氢氧化物的其他代表性吸附剂相比，ZrO(OH)2(Na2O)0.05 1.5H(2)O对海水中磷酸根离子的吸附性更高。使用0.1 M NaOH溶液可实现ZrO(OH)2(Na2O)0.05 1.5H2O上磷酸根离子的有效解吸。讨论了实验数据在去除海水和废水中磷酸盐实际应用中的实用性。
