摘要
本文采用天然蛇纹石为吸附剂,以K(Sb O)C_4H_4O_6·1/2H_2O为Sb(Ⅲ)锑源,进行吸附试验。探讨了不同吸附时间、初始浓度、p H值、温度对吸附量的影响及解吸效果。利用傅里叶红外光谱仪、X-射线衍射仪对天然蛇纹石进行表征。结果表明:天然蛇纹石主要矿物是纤蛇纹石;Elovich模型能更好地反应吸附动力学过程,由Hill1模型可知理论最大吸附量为9.51 mg/g; Langmuir模型和Freundlich模型对等温吸附曲线拟合效果相同;初始p H值在1.9时吸附量最大,可达9.69 mg/g,初始p H值在3.6～8.0范围内吸附量变化幅度小,初始p H值为10.5时,吸附量略有增加;温度升高有利于吸附的进行;在365 min时的解吸量可达理论最大解吸量的82.6%,表明解吸效果好,有利于吸附剂的重复利用;蛇纹石表面活性基团OH-在其对Sb(Ⅲ)的吸附过程中起主要作用。Sb(Ⅲ)在蛇纹石表面主要形成内源表面络合。
Using natural serpentine as adsorbent and K(SbO)C4H4O6·1/2 H2O as Sb(Ⅲ) antimony source, the adsorption experiments were carried out. The effects of different adsorption time, initial concentration, pH and temperature on adsorption capacity and desorption effect were discussed.Natural serpentine was characterized by FTIR spectrum, X-ray diffraction.The results show that the main mineral of natural serpentine is chrysotile;Elovich model is more suitable for the kinetic process of reaction and adsorption. according to Hill1 model, the theoretical maximum adsorption capacity is 9.51 mg/g;Langmuir model and Freundlich model have the same fitting effect on isothermal adsorption curve;When the initial pH is 1.9,the adsorption capacity reaches 9.69 mg/g, and the initial pH value varies slightly in the range of 3.6-8.0, when the initial pH is 10.5, the adsorption amount increases slightly;The increase of temperature is beneficial to the adsorption process;At 365 min, the desorption amount can reach 82.6% of the theoretical maximum desorption fineness, which indicates that the desorption effect is good and is conducive to the reuse of adsorbents. The serpentine surface active group OH-plays a major role in its adsorption of Sb(Ⅲ). Sb(Ⅲ) mainly forms endogenous surface complexation on serpentine surface.
作者
龙智贤
刘爱平
黄阳
王维清
Long Zhixian;Liu Aiping;Huang Yang;Wang Weiqing(College of Environment & Resources, South West University of Science & Technology, Mianyang, Sichuan 621010)
出处
《非金属矿》
CAS
CSCD
北大核心
2019年第3期9-12,共4页
Non-Metallic Mines
基金
四川省教育厅项目(12zd1121)
国家自然科学基金面上项目(41772367)
关键词
天然蛇纹石
吸附量
等温吸附
解吸效果
natural serpentine
adsorption capacity
isothermal adsorption
solution effect
