4.7 Article

Removal of polybrominated diphenyl ethers in high impact polystyrene (HIPS) from waste TV sets

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 29, 期 39, 页码 59317-59327

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-20046-y

关键词

Debromination; Polybrominated diphenyl ethers (PBDEs); Brominated flame retardant; HIPS Plastics; TV sets; Antisolvent precipitation

资金

  1. Open Fund of Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology [2018B030322017]
  2. Key academic institutions of school of Environment, Tsinghua University
  3. Natural Science Foundation of Guangdong Province [S2013010012539]

向作者/读者索取更多资源

Improper disposal of e-waste can lead to environmental pollution and human health risks due to the release of high concentrations of PBDEs. However, recycling waste electronic plastics using solvent processes can help reduce these risks. This study focused on the recycling of HIPS from waste TV sets using d-limonene and n-propanol as solvent and precipitant, respectively. The research investigated the relationship between precipitation conditions and the size of precipitate particles, as well as the effect of these conditions on the removal percentage of PBDEs. The results showed that specific conditions, such as lower HIPS concentration, lower precipitation temperature, higher mass ratio of n-propanol to HIPS solution, and greater stirring speed, can promote the formation of smaller and more uniform precipitate particles, thereby improving the removal percentage of PBDEs.
Most studies have shown that improper disposal of e-waste can accelerate the release of high concentrations of polybrominated diphenyl ethers (PBDEs), and this situation causes environmental pollution and human health risks. The recycling technology of waste electronic plastics based on solvent processes can reduce environmental pollution and health risks from PBDEs. In this study, high impact polystyrene (HIPS) from waste TV sets was taken as the research object, and d-limonene and n-propanol were used as solvent and precipitant, respectively. We studied the relationship between the precipitation conditions and the size of precipitate particles, and the effect laws of precipitation conditions on the removal percentage of PBDEs were discussed. Transferring behavior of PBDEs during precipitation was investigated, and the parameters suitable for removing PBDEs from HIPS solution were confirmed. Results showed that lower HIPS concentration in d-limonene, lower precipitation temperature, higher mass ratio of n-propanol to HIPS solution, and greater stirring speed were conducive to form smaller and more uniform precipitate particles. All conditions (concentration, temperature, mass ratio, and stirring rate) that could increase the solubility of PBDEs in the mixed solvent of limonene and n-propanol or decrease the swelling degree of HIPS precipitate particles, or reduce the size of particles could improve the removal percentage of PBDEs. The investigated results indicated that insoluble PBDEs (e.g., decabromodiphenyl ether) transferred into the HIPS precipitate mainly through the generated crystals and then precipitated together with the HIPS particles, and soluble PBDEs (e.g., octabromodiphenyl ether) migrated into the precipitate by the solution entrained. The precipitate particles, which measured approximately 1.0 mm (on average), were obtained when the solution containing 10% of HIPS from waste TV shell was precipitated by adding n-propanol equivalent to twice the mass of the solution at 40 degrees C and 3000 r/min stirring speed. The total concentration of PBDEs in the precipitate particles (dried) was reduced to 2369 mg/kg, and 88.06% of the PBDEs in the original plastic solution was successfully removed by this process.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据