期刊
ENVIRONMENTAL TECHNOLOGY
卷 37, 期 20, 页码 2658-2668出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1158868
关键词
Adsorption; montmorillonite; nitrate; silver; -aminopropyltrimethoxysilane
资金
- Research Secretariat of the National University of Comahue [I192]
natural clay (Mn) modified with.-aminopropyltrimethoxysilane (Mn-S) and silver (Mn-S-Ag) were evaluated as a potential adsorption media for nitrate removal from water. These materials were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, zeta-potential, thermogravimetric analysis, scanning electron microscopy and elemental analyses. First, the adsorption capacity of the Mn-S clay for Ag+ was studied. The cation adsorption capacity was almost three times greater for Mn-S than for Mn because a metal-amino group complex is favored. Second, the nitrate adsorption on Mn-S and Mn-S-Ag was studied as a function of contact time, pH, temperature and adsorbent dosage using batch techniques. In the absence of Ag+, NO-3 adsorption was high at low pH and the amount of adsorbed nitrate decreased as the pH increased. For the Mn-S, the following monolayer adsorption capacities were obtained: Qmax = 0.80, 0.72 and 0.68 mmol NO-3 /g at pH 3, 5 and 7, respectively, whereas for the Mn-S-Ag the values obtained were: Qmax = 0.77, 0.74 and 0.42 mmol NO-3 /g at pH 3, 5 and 7, respectively. From the results obtained, NO-3 adsorption occurs over -NH+ 3 surface groups without involving the Ag+ cation in the adsorption process.
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