| 施用原始及铁改性生物质炭对土壤吸附砷(Ⅴ)的影响 |
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| 引用本文： | 戴志楠,温尔刚,陈翰博,杨兴,陈俊辉,郭佳,王海龙.施用原始及铁改性生物质炭对土壤吸附砷(Ⅴ)的影响[J].浙江农林大学学报,2021,38(2):346-354. |
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| 作者姓名： | 戴志楠 温尔刚 陈翰博 杨兴 陈俊辉 郭佳 王海龙 |
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| 作者单位： | 1.浙江农林大学 环境与资源学院，浙江 杭州 3113002.佛山科学技术学院 环境与化学工程学院，广东 佛山 5280003.沈阳农业大学 农学院，辽宁 沈阳 1100004.诚邦生态环境股份有限公司，浙江 杭州 310008 |
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| 基金项目： | 国家自然科学基金资助项目(21876027);佛山市科技创新团队项目(1920001000083)。 |
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| 摘 要： | 目的 考察生物质炭及铁改性生物质炭对土壤吸附砷As(Ⅴ)]的影响。 方法 以法国梧桐Platanus orientalis修剪枝为原料在650 ℃限氧条件下热解制备生物质炭，并通过氯化铁(FeCl3)溶液浸渍、热解，将其进一步制备成铁改性生物质炭，对比考察改性后生物质炭理化性质和表面官能团的变化；并通过批量吸附试验探究不同As (Ⅴ)初始质量浓度、吸附时间对施炭土壤吸附As (Ⅴ)效果和规律的影响，通过分析吸附等温线特征和吸附动力学特征，探明吸附机制。 结果 铁改性生物质炭较原始生物质炭pH、比表面积及官能团数量降低，但灰分质量分数和电导率有所增加；Langmuir模型能较好拟合施炭土壤对As(Ⅴ)的吸附过程，表明吸附以单分子层为主。当As (Ⅴ)溶液初始质量浓度大于25 mg·L?1后，铁改性生物质炭对As (Ⅴ)的吸附量大于原始生物质炭，且最大吸附量为0.36 mg·g?1。原始生物质炭和铁改性生物质炭对As (Ⅴ)的动力学吸附符合准二级动力学方程，吸附过程在4 h前后分别为快速吸附和慢速吸附2个阶段，在24 h左右趋于平衡，且铁改性生物质炭处理下土壤的饱和吸附量比原始生物质炭处理高11%。 结论 施用2种生物质炭均能提高土壤对As (Ⅴ)的吸附效果，且铁改性生物质炭的吸附效果优于原始生物质炭。因此，施用铁改性生物质炭可以加强土壤对As (Ⅴ)的吸附作用从而降低As生物有效性。图6表3参39
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| 关 键 词： | 铁改性生物质炭 园林废弃物 吸附 砷(Ⅴ) 污染土壤 |
| 收稿时间： | 2020-06-19 |
Effect of raw and iron-modified biochar on the sorption of As(Ⅴ) by soils |
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| DAI Zhinan,WEN Ergang,CHEN Hanbo,YANG Xing,CHEN Junhui,GUO Jia,WANG Hailong.Effect of raw and iron-modified biochar on the sorption of As(Ⅴ) by soils[J].Journal of Zhejiang A&F University,2021,38(2):346-354. |
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| Authors: | DAI Zhinan WEN Ergang CHEN Hanbo YANG Xing CHEN Junhui GUO Jia WANG Hailong |
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| Affiliation: | 1.College of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China2.School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, Guangdong, China3.Agronomic College, Shenyang Agricultural University, Shenyang 110000, Liaoning, China4.Chengbang Eco-Environment Co. Ltd., Hangzhou 310008, Zhejiang, China |
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| Abstract: | Objective]This study is aimed to investigate the effect of raw biochar and Fe-modified biochar on the soil adsorption of As(Ⅴ).Method]First,the raw biochar was produced from the branches of Platanus orientalis by means of pyrolysis at 650℃in an oxygen-limited condition,while its Fe-modified biochar(weight ratio of Fe∶biochar=1∶20)was obtained from the impregnation with FeCl3 solutions and re-pyrolysis beofe the physiochemical properties and surface functional groups of two biochars were examined for changes.Then with the employment of a batch equilibration method,an investigation was conducted of the impacts of initial As(Ⅴ)concentration and sorption time on As(Ⅴ)sorption by soils treated with raw and Fe-modified biochars.At last,The characteristics of the sorption isotherms and kinetics were analyzed.Result](a)The Fe-modified biochar had higher ash content and electrical conductivity,but lower pH,specific surface area and abundance of surface functional groups than those of the raw biochar;(b)Langmuir isothermal models could well describe the sorption process of As(Ⅴ)by biochar-amended soils,indicating that the monolayer sorption was the predominant process:with an initial As(Ⅴ)concentration higher than 25 mg·L-1 in the solution,the sorption capacity of the Fe-modified biochar to As(Ⅴ)(up to 0.36 mg·g-1)was greater than that of the raw biochar;(c)The kinetic sorption of As(Ⅴ)could be described by the pseudo-second-order kinetics and the sorption process could be divided into two stages from the critical point of reaction at 4 t h hour,i.e.,rapid sorption and slow sorption,respectively;(d)The sorption equilibrium was achieved around 24 hours of reaction,and the maximum sorption capacity of the Fe-modified biochar treatment was 11%higher than that of the raw biochar treatment.Conclusion]Both biochars could enhance the As(Ⅴ)sorption capacity of the soil,and the addition of the Fe-modified biochar was more effective than that of the raw biochar.Therefore,the Fe-modified biochar is recommended in the reduction of the bioavailability of As(Ⅴ)in contaminated soils by enhancing its adsorption capacity. |
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| Keywords: | Fe-modified biochar green waste sorption arsenic(Ⅴ) contaminated soil |
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