| 不同粒径农膜及老化方式对Cd2+吸附的影响 |
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| 引用本文： | 薛日昕,张海祥,李廷杭,李昌恒,刘银,王青青,郭根茂.不同粒径农膜及老化方式对Cd2+吸附的影响[J].热带生物学报,2020,11(3):301-309. |
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| 作者姓名： | 薛日昕 张海祥 李廷杭 李昌恒 刘银 王青青 郭根茂 |
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| 作者单位： | 1.海南大学 生态与环境学院/海南省农林环境过程与生态调控重点实验室，海口 570228 |
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| 基金项目： | 国家自然科学基金;海南省自然科学基金 |
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| 摘 要： | 农膜被广泛应用，残留农膜的污染问题已成为广泛关注的热点之一。目前，农膜颗粒对土壤环境中污染物迁移转化过程的影响少有研究。本研究以3种粒径4目(4.75 mm)、10目(2.0 mm)、30目(0.6 mm)]农膜颗粒为材料，在农膜浓度、初始pH、吸附时间、Cd2+初始浓度及不同老化方式的农膜颗粒等因素上探讨农膜颗粒对Cd2+吸附的影响，并利用扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)和吸附模型拟合等解析3种粒径农膜颗粒对Cd2+的吸附机理。结果表明:农膜颗粒对Cd2+的吸附能力与粒径大小成反比；准二级动力学模型及Langmuir等温吸附模型能较好地揭示对Cd2+的吸附规律；硝酸老化农膜颗粒较原农膜颗粒吸附容量减少了50.10%，过氧化氢老化农膜颗粒较原农膜颗粒吸附容量增加了21.36%。研究结果可为残留农膜对重金属的迁移转化过程、机制与污染防控提供参考和借鉴。
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| 关 键 词： | 农膜 不同粒径 老化 镉 吸附 Langmuir模型 |
| 收稿时间： | 2020-03-14 |
Adsorption of Cadmium by Agricultural Films with Different Particle Sizes and Aging Methods |
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| Affiliation: | 1.College of Ecology and Environment/Hainan Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation, Hainan University , Haikou ,Hainan 570228, China2.College of Tropical Crops, Hainan University, Haikou ,Hainan 570228, China |
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| Abstract: | The wide application of agricultural film makes the problem of residual pollution of agricultural film impossible to be ignored, and the impact of agricultural film particles on the migration and transformation of pollutants in the soil environment is rarely studied. Agricultural film with three different particle sizes (4 mesh, 10 mesh, 30 mesh)were used to study the effects of agricultural film concentration, initial pH, adsorption time, initial Cd2+ concentration and aging methods on Cd2+ adsorption, and Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and adsorption model fitting were used to explore the Cd2+ adsorption characteristics of three different particle sizes of agricultural films under different aging methods. The results showed that the adsorption capacity of agricultural film particles for Cd2+ was inversely proportional to the particle size.The pseudo-second-order kinetic model and Langmuir isotherm adsorption model better fitted the adsorption process of Cd2+ by the agricultural films. The agricultural film particles treated with nitric acid aging reduced its adsorption capacity of Cd2+ by 50.10% and the hydrogen peroxide aging treatment increased its adsorption capacity of Cd2+ by 21.36% as against the control(agricultural film particles without aging). These results can provide a reference for exploration of the migration process and mechanism of Cd2+ in soil through agricultural film particles and the prevention and control of residual agricultural film. |
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