钛(Ⅳ)和铝(Ⅲ)改性沸石去除水溶液中过量氟离子  

Ti( Ⅳ )-loaded and Al( Ⅲ )-loaded zeolite for removal of excessive fluoride in aqueous solution

作　　者：刘杰[1] 王林裴 李宛怡[2] 刘云国[1] 洪松[2] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]武汉大学资源与环境科学学院,武汉430079

出　　处：《环境工程学报》2016年第12期7086-7092,共7页Chinese Journal of Environmental Engineering

摘　　要：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。We synthesized aluminum-loaded zeolite（ Al-Z） and titanium-loaded zeolite（ Ti-Z） samples to evaluate their performances for fluoride removal. Results showed that zeolite had almost no adsorption capacity for fluoride ion,while the modified zeolite showed better removal performance of fluoride ion than the unmodified synthetic zeolite. The maximum uptake of fluoride ion on Al-Z（ 2 g·L^-1） and Ti-Z（ 4 g·L^-1） were 32. 94mg·g^-1and 15. 03 mg·g^-1,respectively. In pH experiments,Al-Z showed great adsorption capacity for fluoride ion under weakly acidic and neutral conditions; however,the adsorption of fluoride ion over Ti-Z was better under acidic conditions,and Ti-Z achieved maximum adsorption capacity at pH = 3. Additionally,the presence of coexisting ions,especially CO2-3and PO3-4,had a negative influence on the adsorption of the fluoride ions,and the decrease in removal efficiency was due to the change in pH. The dynamic experimental results showed that the secondary dynamics model could be used to describe the two kinds of modified zeolite adsorption behaviors of fluoride ion. Meanwhile,the Freundlich isotherm model had good fitting for the adsorption of fluoride ion.Compared with Ti-Z,Al-Z had better adsorption behavior under various factors like adsorbent dosage,pH,and coexisting ions. Undoubtedly,the adsorption efficiency of Al-Z for the fluoride ion could be applied for fluoride removal.

关 键 词：改性沸石 无机氟 吸附 钛改性 铝改性 

分 类 号：X703[环境科学与工程—环境工程]