浮萍生物炭的老化作用对其性质及对Cd(Ⅱ)吸附的影响.pdfVIP

环境工程 60 Environmental Engineering 浮萍生物炭的老化作用对其性质及对 Cd(II) 吸附的影响* 陈豆梁暖郑章琪施维林 (苏州科技学院环境科学与工程学院，浙江苏州 215011 ) 搞要:为了研究老化作用对生物炭性质及其对重金属 Cd 吸附的影响，将浮萍生物炭(LM) 分别进行了高温老化(high temperature aging) 、冻融循环老化( freeze-thaw cyclesaging) 和自然老化( spontaneous aging) ，通过 SEM-EDS ， FTIR 和吸附 实验探究可能存在的变化机理。结果显示:冻融循环老化和高温老化会使生物炭表面 O/C 分别增加 56.98% 和 90. 147岛，自然老化比较缓慢，对生物炭。/C 影响不大。高温老化使生物炭表面楚基转化为援基，为竣基化过程;冻融 循环老化会使生物炭表面楚基增加，其他官能团基本不变;自然老化条件下，生物炭表面官能团无明显变化。老化作 用增强了生物炭对 Cd ( n)的吸附，冻融循环、高温、自然老化作用使 LM 最大平衡吸附量分别增加了 32.67% , 83.17 7岛， 15.97% 。研究表明生物炭的老化会使生物炭本身性质发生变化，但这一变化有利于生物炭对 Cd( n) 的吸 附，生物炭在环境中具有较好的稳定性。 关键词:生物炭;老化;含氧官能团;Cd( n );吸附 DOI: 10. 13205/j. hjgc. 201610013 INFLUNCE OF BIOCHAR AGEING ON ITS PROPERTIES AND Cd( n) ADSORPTION CHEN Yu , LIANG Yuan , ZHENG Zhang-qi , SHI Wei-lin (School of Environmental Science and Engineering , Suzhou University of Science and Technology , Suzhou 215011 , China) Abstract: In order to study the effects of biochar ageing on Cd ( n ) adsorption , the paper analyzed the surface properties before and after biochar ageing with scanning electron microscopy( SEM) coupled to an energy dispersive spectrometer( EDS) and fourier transform infrared spectroscopy ( FTIR ), and then explored the influence of the ageing process on Cd ( n ) adsorption by batch experiments. Biochar were conducted by high temperature ageing , freeze-thaw cycles ageing and spontaneous ageing. After high temperature ageing and freeze-thaw cycles ageing progress , the O/C ratio increased , but the O/C ratio had no significant changes by spontaneous ageing. After high t