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制备了负载铝沸石(Al-Z)和负载钛沸石(Ti-Z)复合材料并测试了2种吸附材料对氟离子的吸附性能。未改性的人造沸石对氟离子几乎没有吸附作用,室温下2 g·L~(-1)的Al-Z和4 g·L~(-1)的Ti-Z的最大吸附量分别为32.94 mg·g~(-1)和15.03 mg·g~(-1)。在偏酸性和中性条件下有利于Al-Z对氟离子的吸附;Ti-Z对氟离子的吸附效果在酸性条件下较好;Zeta电位结果表明Al-Z对氟离子的吸附较Ti-Z有更广泛的pH适应能力;Al-Z和Ti-Z受CO2-3和PO3-4共存离子的影响对氟离子的去除率下降,且Ti-Z受影响程度更大,这是因为CO2-3和PO3-4的存在会改变溶液的pH值,使溶液呈碱性,从而影响吸附剂对氟离子的吸附效果;准二级动力学模型和Freundlich等温线方程符合描述这两种改性沸石对氟离子的吸附行为。与Ti-Z相比,Al-Z在吸附剂用量、氟离子吸附量、对pH与共存阴离子的适应性方面表现更好,是一种非常具有应用前景的氟离子吸附剂。
Aluminum-zeolite (Al-Z) and titanium-zeolite (Ti-Z) composite were prepared and their adsorption properties on fluoride ion were tested. The unmodified artificial zeolite has almost no adsorption of fluoride ions. The maximum adsorption capacities of 2 g · L -1 Al-Z and 4 g · L -1 Ti-Z at room temperature are 32.94 mg · g ~ (-1) and 15.03 mg · g ~ (-1) respectively. The adsorption of fluoride on Al-Z is favorable under acidic and neutral conditions; the adsorption of fluoride on Ti-Z is better under acidic conditions; the Zeta potential shows that adsorption of fluoride on Al-Z is better than Ti- Z has a wider range of pH adaptability; Al-Z and Ti-Z affected by the coexistence of CO2-3 and PO3-4 ion fluoride removal efficiency decreased, and Ti-Z affected more greatly, because CO2 -3 and PO3-4 will change the pH value of the solution, making the solution alkaline, thus affecting the adsorption of fluoride ions on the adsorbent; quasi-second-order kinetic model and Freundlich isotherm equation in line with the description of these two modifications Adsorption behavior of zeolite to fluoride ion. Compared with Ti-Z, Al-Z is a kind of fluoride ion adsorbent that has a promising prospect in terms of the amount of adsorbent, the amount of fluoride ion adsorption, the adaptability to pH and co-existing anion.