School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, China; School of Municipal and Mapping Engineering, Hunan City University, Yingbin East Road 518, Yiyang, Hunan 413000, China.
School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, China.
J Colloid Interface Sci. 2017 Nov 1;505:947-955. doi: 10.1016/j.jcis.2017.06.074. Epub 2017 Jun 23.
A novel adsorbent embedding Mg-Al-Zr mixed oxides with millimetre-sized calcium alginate beads (SA-CMAZ) was synthesized, characterized, and applied for the secondary removal of fluoride from wastewater. Key factors affecting the fluoride adsorption, including initial fluoride concentration, contact time, initial pH and coexisting anions, were investigated. The results showed that fluoride could be removed by SA-CMAZ over a wide pH range, from 4 to 10. The presence of coexisting anions weakened the adsorption of fluoride, and the decreasing order of the removal towards fluoride was PO>CO>SO>NO. The adsorption follows a pseudo second order kinetic with theoretical adsorption capacity (Q) and experimental adsorption capacity (Q) close to each other at the temperatures of 303K, 308K, and 313K. The equilibrium data could be fitted by the Freundlich isotherm model as the SA-CMAZ is a heterogeneous. The value of the thermodynamic parameter indicated an endothermic adsorption process. A negative value shows the feasibility and spontaneity of the material-anion interaction.
一种新型的吸附剂，将镁铝锆混合氧化物嵌入毫米大小的海藻酸钠珠（SA-CMAZ）中，进行了合成、表征，并应用于废水的二次除氟。考察了影响氟吸附的关键因素，包括初始氟浓度、接触时间、初始 pH 值和共存阴离子。结果表明，SA-CMAZ 在较宽的 pH 值范围内（4 至 10）都能去除氟。共存阴离子的存在削弱了氟的吸附，氟的去除顺序为 PO>CO>SO>NO。吸附过程遵循准二级动力学，在 303K、308K 和 313K 下，理论吸附容量（Q）和实验吸附容量（Q）接近。平衡数据可以用 Freundlich 等温模型拟合，因为 SA-CMAZ 是一种不均匀的。热力学参数的值表明吸附是吸热过程。负的数值表明了材料-阴离子相互作用的可行性和自发性。
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