Kim Gyuhyeon, Lee Dae Sung, Eccles Harry, Kim Su Min, Cho Hyun Uk, Park Jong Moon
Division of Advanced Nuclear Engineering, Pohang University of Science and Technology Pohang 37673 Republic of Korea.
Department of Environmental Engineering, Kyungpook National University 80 Daehak-ro, Buk-gu Daegu 41566 Republic of Korea.
RSC Adv. 2022 Jun 29;12(29):18936-18944. doi: 10.1039/d2ra02494b. eCollection 2022 Jun 22.
Amorphous sodium titanates were synthesized using a mid-temperature sol-gel method for evaluation as selective adsorbents of strontium in the presence of cesium or metal cations (Al, Mg, Ca, and Mn) from aqueous solution. Synthesized sodium titanate showed high adsorption capacity and selectivity for strontium. The maximum adsorption capacity of strontium by sodium titanate was 193.93 mg g in aqueous solution containing an initial concentration of 5 mM (438.60 mg L) strontium and 5 mM (666.67 mg L) cesium, and this sodium titanate removed 99.9% of the strontium and 40.67% of cesium from an aqueous solution that had an initial concentration of 1.14 mM (100 mg L) strontium and 0.75 mM (100 mg L) cesium. Strontium adsorption by synthesized sodium titanate followed pseudo-second-order kinetics and a generalized Langmuir isotherm model, and reached an adsorption equilibrium within 1 h with high adsorption capacity at equilibrium. Adsorbed strontium onto synthesized sodium titanate showed the behavior of forming a strontium titanate structure with a titanate frame surface precipitation.
采用中温溶胶-凝胶法合成了无定形钛酸钠，以评估其在水溶液中作为铯或金属阳离子（铝、镁、钙和锰）存在下锶的选择性吸附剂的性能。合成的钛酸钠对锶具有较高的吸附容量和选择性。在含有初始浓度为5 mM（438.60 mg/L）锶和5 mM（666.67 mg/L）铯的水溶液中，钛酸钠对锶的最大吸附容量为193.93 mg/g，并且这种钛酸钠从初始浓度为1.14 mM（100 mg/L）锶和0.75 mM（100 mg/L）铯的水溶液中去除了99.9%的锶和40.67%的铯。合成的钛酸钠对锶的吸附遵循准二级动力学和广义朗缪尔等温线模型，并在1小时内达到吸附平衡，平衡时具有较高的吸附容量。吸附在合成钛酸钠上的锶表现出与钛酸框架表面沉淀形成钛酸锶结构的行为。
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