H_(2)O_(2)改性香蕉秆生物炭的结构变化及对玉米幼苗Cr吸收的影响  

Characteristics of Modified Biochar Obtained from Banana Stem by H_(2)O_(2) and Its Effect on Cr Uptake by Maize

作　　者：宋书会 杨爽 王超 李普旺 焦静[1] 刘思汝 何祖宇 刘运浩 周闯 杨子明 SONG Shuhui;YANG Shuang;WANG Chao;LI Puwang;JIAO Jing;LIU Siru;HE Zuyu;LIU Yunhao;ZHOU Chuang;YANG Ziming(South Subtropical Crops Research Institute,Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Tropical Crops Nutrition of Hainan Province,Zhanjiang,Guangdong 524091,China;College of Natural Resources and Environment,South China Agricultural University,Guangzhou,Guangdong 510642,China;College of Tropical Crops,Yunnan Agricultural University,Pu’er,Yunnan 665000,China)

机构地区：[1]中国热带农业科学院南亚热带作物研究所/海南省热带作物营养重点实验室,广东湛江524091 [2]华南农业大学资源环境学院,广东广州510642 [3]云南农业大学热带作物学院,云南普洱665000

出　　处：《热带作物学报》2024年第6期1262-1272,共11页Chinese Journal of Tropical Crops

基　　金：海南省自然科学基金项目(No.322MS119,No.320QN324,No.421MS078)。

摘　　要：为研究过氧化氢(H_(2)O_(2))对香蕉秆生物炭的改性效果及改性后生物炭对铬(Cr)胁迫下玉米Cr吸收的影响,采用不同浓度H_(2)O_(2)对300℃下制备的生物炭进行改性,分析其结构特征的差异,并将改性生物炭应用于Cr胁迫下的玉米生长体系中,研究改性生物炭对Cr胁迫下玉米植株生长及Cr吸收积累的影响。结果表明:随着H_(2)O_(2)浓度的升高,生物炭表面含氧官能团数量增多,其芳香性减弱、极性增强。改性后生物炭表面光滑,孔直径增大,其比表面积和孔隙体积随H_(2)O_(2)浓度的升高而减小。20%、30%H_(2)O_(2)改性生物炭主要通过官能团的吸附作用固定重金属,降低其生物活性,减少玉米对Cr的吸收积累。20%、30%H_(2)O_(2)明显改变生物炭的表面结构,有利于缓解重金属Cr对玉米植株的毒害,30%H_(2)O_(2)改性生物炭对Cr胁迫下玉米的生长具有促进作用。Biochar was modified with different concentrations of hydrogen peroxide,and the differences in its structural characteristics were analyzed to study the modification effect of hydrogen peroxide on biochar obtained from banana stem and the effect of modified biochar on Cr absorption of maize under Cr stress.The effects of modified biochar on the growth,Cr uptake and accumulation of maize under Cr stress were studied.With the increase of hydrogen peroxide concentration,the number of oxygen-containing functional groups on the surface of biochar increased,while the aromatics decreased and the polarity increased.After the modification,the surface of biochar was smooth,the pore diameter increased,and the specific surface area and pore volume decreased with the increase of hydrogen peroxide concentration.Modified biochar by 20% and 30% hydrogen peroxide mainly fixed heavy metals through the adsorption of functional groups,reduced its biological activity,and reduced the Cr absorption and accumulation by corn.The study showed that 20% and 30% hydrogen peroxide significantly changed the surface structure of biochar,which was conducive to alleviating the toxicity of heavy metal Cr to corn plants.30% hydrogen peroxide modified biochar promoted the growth of corn under Cr stress.

关 键 词：过氧化氢(H_(2)O_(2)) 生物炭 铬(Cr) 玉米 生长 

分 类 号：TQ424[化学工程]