| 邓惠1,2，俞花美3，李昉泽2，冯丹2，葛成军1,2.木薯渣基生物质炭对土壤中阿特拉津
吸附特性的影响[J].广东农业科学,2014,41(4):79-84 |
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木薯渣基生物质炭对土壤中阿特拉津
吸附特性的影响 |
| Sorption properties of atrazine by biochars preparedfrom manioc wastes in soil |
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| DOI： |
| 中文关键词: 生物质炭 砖红壤 阿特拉津 吸附动力学 吸附等温线 |
| 英文关键词: biochar laterite atrazine adsorption
kinetics adsorption isotherm |
| 基金项目:国家自然科学基金（21367011）；海南省自然科学
基金（413123）；热带作物种质资源保护与开发利用教育部重点实
验室开放基金（2012hckled-5） |
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| 中文摘要: |
| 以木薯渣为前驱物，采用持续升温限氧法制备了不同温度(350、550、750益)的生物质炭(BC350、BC550
和BC750)，并对其结构和成分进行了表征。基于guideline106 批量平衡法，研究了生物质炭对砖红壤中阿特拉津吸
附行为的影响。结果表明，阿特拉津的吸附动力学是一个先快后慢的过程，生物质炭施用可缩短阿特拉津达到吸
附平衡的时间，施入量越多，达到饱和的时间越短。施入量相同条件下，最早到达平衡的处理是BC750，BC550 次
之，BC350 最后达到饱和。伪二级动力学方程能较好地描述生物质炭对砖红壤中阿特拉津的吸附动力学特性（R2>
0.864）。阿特拉津在生物质炭土壤中的吸附等温线表现为非线性，分配作用和表面吸附作用联合是主要机制。在土
壤中添加3%和5%BC750 的处理用Temkin 方程拟合最佳，其余处理均符合Langmuir 方程和Freundlich 方程。logKF
值随着生物质的量增加而逐渐增大。对于不同温度制备的生物质炭，logKF 的大小顺序表现为BC750>BC550>
BC350，说明土壤中阿特拉津的吸附能力与生物质炭的热解温度有关。此外，阿特拉津的吸附-解吸过程存在明显
的滞后现象，滞后系数HI 均大于1，且表现为BC750>BC550>BC350。因此，土壤中阿特拉津的风险评价和修复需
考虑滞后现象。 |
| 英文摘要: |
| Three types of biochars (BC350, BC550 and BC750) we re prepared by pyrolyzing manioc wastes at
different temperatures (350, 550 and 750益) under an oxygen-limited condition, the structures and compositions of BC were
characterized. According to the guideline106 batch experiment, adsorption kinetics and isotherms of atrazine in biocharadded
soil were studied. The results showed that BC c燥uld shorten balance time of atrazine, and it had positive correlation
with the content of BC. For the same intake, time of reaching balance of BC750 was the shortest, as 5% BC750 only
needed about 30 min. The data were fitted greatly to the pseudo -second -order model with R2 in 0.864 ~1.000. The
isotherms of atrazine were nonlinear; the joint of partition and pore-filling was a major mechanism. Temkin equation was
the best model for 3% BC750 and 5% BC750, and using Langmuir and Freundlich model to describe the other 13
treatments was perfect. logKF was an important parameter to represent adsorption capacity, which increased with the
increasing content of BC increasing. As to different types of BC, logKF was shown in order of BC750>BC550>BC350, which
indicated that the affinity of atrazine was relative with
charring temperature of BC. In addition, adsorption -
desorption process of atrazine showed obvious hysteresis,
all the HI values were greater than 1 with following
BC750 > BC550 > BC350, which belonged to the
negative lag effect and suggested that the desorption rate
was greater than the adsorption rate. |
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