氧化老化玉米秸秆生物炭吸附镉机理研究  

Mechanism of cadmium adsorption by oxidative aging corn straw biochar

作　　者：马凯悦 张浩 宋宁宁 王芳丽 林大松 MA Kaiyue;ZHANG Hao;SONG Ningning;WANG Fangli;LIN Dasong(College of Resource and Environment,Northeast Agricultural University,Harbin 150030,China;Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;Qingdao Rural Environmental Engineering Research Center,School of Resources and Environment,Qingdao Agricultural University,Qingdao 266109,China)

机构地区：[1]东北农业大学资源与环境学院,哈尔滨150030 [2]农业农村部环境保护科研监测所,天津300191 [3]青岛农业大学资源与环境学院青岛市农村环境工程研究中心,山东青岛266109

出　　处：《农业环境科学学报》2022年第6期1230-1240,共11页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(41877403)。

摘　　要：为研究玉米秸秆生物炭在经过模拟自然界老化后对Cd^(2+)的吸附响应,本文利用H_(2)O_(2)对玉米秸秆生物炭进行氧化老化1、2、3次,利用元素分析仪、扫描电镜、红外光谱及碳谱等分析方法,分析老化前后生物炭对Cd^(2+)的吸附及响应机理。结果表明:玉米秸秆生物炭氧化老化过程中形成硅酸盐沉淀;经过H_(2)O_(2)老化后H/C、O/C和(O+N)/C的原子比逐渐升高,使得生物炭含氧官能团上升、芳香性减弱、极性增强;老化1次(OYM1)、2次(OYM2)、3次(OYM3)后玉米秸秆生物炭碱性元素逐步被释放,碱性元素较未氧化玉米秸秆生物炭(YM)分别降低了48.23%、95.04%、95.74%;不同处理生物炭对Cd^(2+)的最大吸附量表现为:YM(12.42 mg·g^(-1))>OYM1(5.98 mg·g^(-1))>OYM3(3.88 mg·g^(-1))>OYM2(3.61 mg·g^(-1)),说明老化作用抑制了其对Cd^(2+)的吸附。在玉米秸秆生物炭长期利用过程中,生物炭的老化促进无机组分发挥作用,吸附性能减弱,在进行土壤及水污染修复时应合理使用。To study the adsorption response of corn straw biochar to Cd^(2+) after simulated natural aging,corn straw biochar was oxidized and aged for 1,2,and 3 times using H_(2)O_(2).The adsorption and response mechanism of Cd^(2+) by biochar before and after aging were analyzed using elemental analyzer,scanning electron microscope,infrared spectrum,and carbon spectrum.The results showed that silicate precipitation was formed during the oxidative aging of corn straw biochar.After H_(2)O_(2) aging,the atomic ratios of H/C,O/C,and(O+N)/C gradually increased,resulting in the increase of oxygen-containing functional groups,weakening of aromaticity and enhancement of polarity of biochar.After aging for 1,2,and 3 times,the alkaline elements of corn straw biochar OYM1,OYM2,and OYM3 were released,and the alkaline elements were reduced by 48.23%,95.04%,and 95.74%,respectively compared with the unaged corn straw biochar(YM).The maximum adsorption capacity of aged corn straw biochar for Cd^(2+) was in the order as follows:YM(12.42 mg·g^(-1))>OYM1(5.98 mg·g^(-1))>OYM3(3.88 mg·g^(-1))>OYM2(3.61 mg·g^(-1)),indicating that aging inhibits its adsorption of Cd^(2+).Long-term usage of corn straw biochar may probably promote the role of inorganic components and weaken its adsorption performance;therefore,it should be used reasonably in the remediation of soil and water pollution.

关 键 词：生物炭 玉米秸秆 老化 吸附机理 CD 

分 类 号：X71[环境科学与工程—环境工程] X505