多孔二氧化硅的動(dòng)態(tài)吸附特性研究
[Abstract]:With the development of modern industry, the waste water containing heavy metals and dyes causes serious environmental pollution. Adsorption is one of the effective methods to treat heavy metal ions and dyes in wastewater. In this paper, porous silica with large surface area, porous silica loaded on silica sand surface and modified porous silica are used as adsorbents to dynamically adsorb hexavalent chromium ion, zinc ion and methylene blue dye in aqueous solution. The mesoporous silica used in the experiment was prepared by using silica sand as silicon source in hydrothermal solution and cetyltrimethylammonium bromide (CTAB) as surfactant to adjust different pH values. In the same way, the SiO_2- surfactant composite coating layer was formed on the surface of the undissolved silica sand in situ, and then the porous silica loaded on the silica sand (hereinafter referred to as SiO_2) was obtained after dry calcination. The modified porous silica (SiO_2) was prepared by modified SiO_2 with 3-aminopropyl triethoxy silane (KH550). The effects of pH value, initial concentration, flow rate and the amount of adsorbent on the dynamic adsorption of heavy metal ions and dye solutions were studied experimentally. The dynamic adsorption process of hexavalent chromium ion and zinc ion by porous silica is fitted by the nonlinear form of Thomas model, and the dynamic adsorption process of methylene blue is fitted by Thomas and Yoon-Nelson models. The effect of Thomas model is better. The optimum conditions for dynamic adsorption of hexavalent chromium and zinc ions were determined by experiments. Under the optimum adsorption conditions, when the adsorbents were mesoporous SiO_2, microporous SiO_2, modified Si O _ 2 and loaded SiO_2, silica sand, the adsorption rates of hexavalent chromium on 5min were 58.02% and 99.06%, respectively. 16.17 and 3.37; The saturation time was 255min ~ 285min ~ (185) min ~ (185) min ~ (65) min ~ (-1) ~ (15) min, and the adsorption rate of 5min was 92.3m ~ 94.48m ~ (98.49) and 91.833 ~ (3) ~ (th) ~ 72.44 ~ (4), respectively, when zinc ion was adsorbed to zinc ion. The saturation time was 250 min / 270 min ~ 240 min ~ (125) min ~ (65) min, respectively. Therefore, the dynamic adsorption of hexavalent chromium and zinc ions by microporous SiO_2 is better than that by mesoporous SiO_2, and the dynamic adsorption of hexavalent chromium and zinc ions by modified SiO_2, loaded SiO_2, silica sand is worse in turn. The dynamic adsorption of methylene blue in aqueous solution by different porous silica was studied. When the adsorbents are mesoporous silica, microporous silica and loaded SiO_2, silica sand, the dynamic adsorption penetration time is 215min / 375min / 255min / min, and the saturation time is 600min / 840min / 600min / 45min, respectively. The results show that the dynamic adsorption of methylene blue in aqueous solution by microporous SiO_2 is better than that of mesoporous SiO_2, and the adsorption effect of loaded SiO_2 is better than that of silica sand.
【學(xué)位授予單位】:濟(jì)南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:O647.33;X703
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