桑树枝和肉桂枝生物炭吸附及钝化土壤镉效果比较  

Comparison of the Adsorption and Inactivation of Soil Cadmium by Two Biochars Derived from Mulberry and Cinnamon Branches

作　　者：黄玉芬 杜毅 王钰静 周丽萍[4] Houssou Assa Albert 黄连喜 魏岚 刘忠珍 HUANG Yufen;DU Yi;WANG Yujing;ZHOU Liping;Houssouassa ALBERT;HUANG Lianxi;WEI Lan;LIU Zhongzhen(Institute of Agricultural Resources and Environment,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China;Eco-Environmental Monitoring Station of Changchun Shuangyang Precint,Changchun 130600,China;Nansha District Agriculture and Rural Service Center,Guangzhou 511455,China;School of Life Sciences,Zhaoqing University,Zhaoqing 526040,China)

机构地区：[1]广东省农业科学院农业资源与环境研究所,广东广州510640 [2]长春市双阳区生态环境监测站,吉林长春130600 [3]广州市南沙区农业农村服务中心,广东广州511455 [4]肇庆学院生命科学学院,广东肇庆526040

出　　处：《广东农业科学》2022年第3期96-105,共10页Guangdong Agricultural Sciences

基　　金：广东省烟草育种与综合利用工程技术研究中心/广东省农作物遗传改良重点实验室联合开放课题(202003);广州市科技计划项目(202102080407);广东省农业科学院“十四五”学科团队建设项目(202120TD)。

摘　　要：【目的】探讨桑树枝和肉桂枝生物炭对水和土壤环境中镉(Cd)污染的修复效果,为实现木质农林废弃物的资源化利用和Cd污染环境修复提供理论依据。【方法】将桑树枝和肉桂枝置于400℃慢速热裂解2 h制备生物炭,采用等温吸附试验研究其吸附Cd特征,通过盆栽试验检验其钝化土壤Cd以及阻止小白菜吸收富集Cd的作用效果。【结果】桑树枝生物炭(MB400)和肉桂枝生物炭(CB400)对Cd的吸附均可用Langmuir等温吸附模型进行拟合,最大吸附容量(Q0)分别达到4 305.61、442.77 mg/kg,MB400吸附Cd的能力较强,这可能与其pH值、灰分(Ash)、阳离子交换量(CEC)和有效磷(AP)含量较高有关。添加MB400可显著降低土壤中有效态镉(AvCd)含量,但CB400处理没有显著效果。添加3%的两种生物炭,小白菜生物量明显提高,Cd的生物富集因子(BCF值)从对照的5.95分别降至4.29(MB400)和4.85(CB400)。【结论】两种生物炭对Cd具有较强的吸附能力,能够钝化土壤Cd,阻止小白菜吸收富集,且桑树枝生物炭的效果更好。【Objective】The study was conducted to explore the remediation effects of biochars derived from mulberry and cinnamon branches on cadmium(Cd) pollution in water and soil environments, with a view to providing a theoretical basis for the resource utilization of woody agroforestry wastes and the remediation of Cd-contaminated environment.【Method】Both mulberry and cinnamon branches were slowly pyrolyzed under 400℃ for 2 h. The obtained biochars were tested for their isothermal adsorption of Cd, and then added into the Cd contaminated soil grown with Brassica chinensis L. in a pot experiment.【Result】Adsorption of Cd b y either mulberry biochar(MB400) or cinnamon biochar(CB400) could be fitted by Langmuir isothermal equation, and the maximum adsorption capacities(Q0) were 4 305.61 mg/kg and 442.77 mg/kg, respectively. It was obvious that MB400 had much higher capacity for adsorption of Cd than that of CB400 treatment, which may be attributed to its higher values in pH, ash and CEC and available phosphorus(AP). Furthermore, MB400 addition significantly reduced the content of available cadmium(AvCd) while it showed little effect under CB400 treatment. The dry matter of B. chinensis L. was remarkably enhanced by adding both biochars. The bioconcentration factor(BCF) of Cd decreased from 5.95 in the control to 4.29(MB400) and 4.85(CB400).【Conclusion】Both biochars had high adsorption capacity for Cd, and could inactivate Cd availability and thereafter inhibited Cd accumulation in cabbage tissue. MB400 showed better effect than CB400.

关 键 词：桑树枝 肉桂枝 生物炭 镉 等温吸附 小白菜 

分 类 号：S141.6[农业科学—肥料学] X53[农业科学—农业基础科学]