| 废旧塑料浮选分离中气泡黏附行为的影响 |
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| 引用本文： | 赵 钺,黄 佳,李彦鹏,刘 珺,孟庆龙. 废旧塑料浮选分离中气泡黏附行为的影响[J]. 环境科学研究, 2015, 28(4): 582-588 |
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| 作者姓名： | 赵 钺 黄 佳 李彦鹏 刘 珺 孟庆龙 |
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| 作者单位： | 1.长安大学环境科学与工程学院, 陕西 西安 710054 |
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| 基金项目： | 流体动力与机电系统国家重点实验室开放基金项目(GZKF-201026);中央高校基本科研业务专项基金项目(2013G2291013) |
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| 摘 要： | 塑料浮选作为一种基于表面活性剂的废旧塑料分选技术,是解决废旧塑料环境污染的有效方法. 为深入考察塑料浮选过程中气泡的黏附行为及影响因素,运用高速摄影技术结合气泡黏附时间模型,对比分析纯水中气泡与亲/疏水材料的黏附效果,重点比较不同溶液〔纯水、鼠李糖脂和SDS(十二烷基硫酸钠)溶液〕中气泡与疏水材料的黏附时间变化,并探讨其影响机制. 结果表明:气泡在纯水中只与疏水材料发生黏附,表面活性剂及其浓度对气泡与疏水材料的黏附时间影响显著. 在c(鼠李糖脂)和c(SDS)(二者均为0.03 mmol/L)均较低的溶液中,气泡与疏水材料的黏附时间由纯水中的158 ms分别降至120和140 ms,而二者较高(10.00 mmol/L)时黏附时间分别增至1 134和338 ms. 基于黏附时间模型分析表明,黏附时间是气泡尺寸、接触角、溶液黏度及表面张力等参数的函数,通过控制这些参数可以调控气泡在目标塑料表面的黏附时间,实现浮选效率的优化.
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| 关 键 词： | 鼠李糖脂 塑料浮选 气泡 黏附行为 高速摄影 |
Research on Bubble Attachment Behavior in the Flotation Process of Waste Plastics |
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| ZHAO Yue,HUANG Ji,LI Yanpeng,LIU Jun and MENG Qinglong. Research on Bubble Attachment Behavior in the Flotation Process of Waste Plastics[J]. Research of Environmental Sciences, 2015, 28(4): 582-588 |
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| Authors: | ZHAO Yue HUANG Ji LI Yanpeng LIU Jun MENG Qinglong |
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| Affiliation: | 1.School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China2.School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China ;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an 710054, China3.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an 710054, China |
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| Abstract: | Abstract: As a kind of separation technique based on surfactants, plastic flotation is an effective method to solve the environmental pollution caused by waste plastics, and has prospective applications. To examine the bubble attachment behavior and its influencing factors in the process of plastic flotation, the bubble attachment effect and time onto hydrophilic and hydrophobized materials in different solutions were investigated using high-speed photography. The influencing mechanisms based on the bubble attachment time model were also discussed in detail. Bubbles only attached hydrophobized materials in different solutions, and the presence of surfactants significantly affected the attachment time. The bubble attachment times on hydrophobized materials in low concentrations of rhamnolipid and sodium dodecyl sulfate solutions (0.03 mmol/L) were lower by 120 and 140 ms respectively than the time in pure water (158 ms). In high concentration (10.00 mmol/L), the times were 1134 and 338 ms respectively. According to the model, the bubble attachment time is a strong function of bubble size, contact angle, solution viscosity and surface tension. The bubble attachment time on the surface of the target plastic can be regulated and controlled by these parameters, which contributes to optimizing the flotation efficiency. |
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| Keywords: | rhamnolipid bubble plastics flotation attachment behavior high-speed photography |
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