超声波协同改性生活垃圾焚烧飞灰对废水中Pb^(2+)的吸附研究

Study on the Adsorption of Pb^(2+)in Wastewater By UltrasonicCo Modified Municipal Solid Waste Incineration Fly Ash

通过碱改性协同超声波辅助法制备垃圾焚烧飞灰吸附剂,探究其最佳制备条件,并将最佳条件下制备的飞灰用于对Pb^(2+)的吸附,结合XRD、SEM、FTIR表征手段进行分析,研究其对Pb^(2+)的吸附性能。研究表明,最佳制备条件为碱灰比0.45、超声波功率640 W、超声波时间30 min,当吸附剂投加量为0.1 g、吸附时间90 min、Pb^(2+)初始质量浓度600 mg/L,最大吸附率到达79.45%,吸附容量达到240.45 mg/g。处理后飞灰中非晶态物质、SiO_(2)和CaCO_(3)含量增多,比表面积增大,同时—OH基团的引入,提高了飞灰的亲水性和反应活性,使吸附性能增强。

A waste incineration fly ash adsorbent was prepared by alkali modification combined with ultrasonic assisted method.The optimal preparation conditions were explored,and the fly ash under the optimal preparation conditions was used for the adsorption of Pb^(2+).XRD,SEM,and FTIR characterization methods were used to analyze its adsorption performance for Pb^(2+).Research has shown that the optimal preparation conditions are an alkali to ash ratio of 0.45,ultrasonic power of 640 W,and ultrasonic time of 30 minutes.When the adsorbent dosage is 0.1 g,the adsorption time is 90 minutes,and the initial concentration of Pb^(2+)is 600 mg/L,the maximum adsorption rate reaches 79.45%and the adsorption capacity reaches 240.45 mg/g.After treatment,the content of amorphous substances,SiO_(2),and CaCO_(3) in fly ash increases,and the specific surface area increases.At the same time,the introduction of-OH groups improves the hydrophilicity and reactivity of fly ash,enhancing its adsorption performance.