不同热解温度万寿菊秸秆制备生物炭对Cd的吸附特性研究

Adsorption Characteristics of Cd on Biochar Derived from Straw of Tagetes erecta at Different Py⁃rolysis Temperatures

以万寿菊秸秆为试验材料,在不同热解温度下制备生物炭,通过测定不同吸附时间、不同pH值、Cd浓度下4种生物炭(T300、T500、T700、T900)的吸附量,研究不同热解温度生物炭对Cd的吸附特性。结果表明,在相同的吸附时间内,吸附效果从小到大依次为T300<T500<T700<T900;随着pH(2~6)的增加,生物炭的吸附能力逐渐增加,当pH值为6时,生物炭对Cd的吸附效果最好;当溶液中Cd浓度增加至50mg·L^-1时,吸附效果最好的2种生物炭对溶液中Cd的吸附量达到最大值。

The article researched on the adsorption characteristics of cadmium on biochar at different pyrolysis tem⁃peratures(300-900℃).Biochar was derived from Tagetes erecta at different temperatures.The adsorption perfor⁃mance of biochar was studied by measuring the adsorption capacities of the four biochar(T300、T500、T700、T900)under different adsorption time,pH and cadmium concentration.The results showed that the order of adsorption effect was T300<T500<T700<T900 in the same adsorption time.As the pH increased from 2.0 to 6.0.With the increase of pH,the adsorption capacity of biochar increased gradually,and the adsorption effect is the best when pH was 6.0.When the concentration of cadmium in the solution increased to 50mg·L^-1,the adsorption capacity of the two biochar with the highest adsorption capacity reached the maximum.