Vận chuyển nanoparticle titanium dioxide trong môi trường xốp bão hòa dưới các điều kiện hóa học dung dịch khác nhau

Springer Science and Business Media LLC - Tập 14 - Trang 1-9 - 2012
Yu Wang1, Bin Gao1, Verónica L. Morales2, Yuan Tian1, Lei Wu1, Jie Gao3, Wei Bai3, Liuyan Yang4
1Department of Agricultural and Biological Engineering, University of Florida, Gainesville, USA
2SIMBIOS Centre, University of Abertay, Dundee, UK
3Department of Environmental Engineering Sciences, University of Florida, Gainesville, USA.
4State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China

Tóm tắt

Do có nhiều ứng dụng, titanium dioxide kích thước nan có thể trở thành mối nguy tiềm tàng đối với môi trường đất và hệ thống nước ngầm. Do đó, việc cải thiện hiểu biết hiện tại về số phận môi trường và sự vận chuyển của các hạt nanoparticle oxit titanium (TONPs) là rất quan trọng. Trong nghiên cứu này, ảnh hưởng của hóa học dung dịch (tức là pH, độ mạnh ion, và nồng độ chất hữu cơ tự nhiên (NOM)) đối với quá trình lắng đọng và vận chuyển của TONPs trong môi trường xốp bão hòa đã được nghiên cứu chi tiết. Các cột thí nghiệm chứa cát thạch anh làm sạch axit đã được sử dụng trong thí nghiệm như là môi trường xốp. Các thí nghiệm vận chuyển được thực hiện với nhiều kết hợp hóa học khác nhau, bao gồm bốn độ mạnh ion, ba mức pH, và hai nồng độ NOM. Kết quả cho thấy tính di động của TONP tăng lên khi pH dung dịch tăng, nhưng giảm khi độ mạnh ion dung dịch tăng. Ngoài ra, sự hiện diện của NOM trong hệ thống đã nâng cao tính di động của TONPs trong môi trường xốp bão hòa. Lý thuyết Derjaguin–Landau–Verwey–Overbeek (DLVO) đã được sử dụng để giải thích các xu hướng di động được quan sát trong dữ liệu thực nghiệm. Dự đoán từ lý thuyết này hoàn toàn khớp với dữ liệu thực nghiệm.

Từ khóa

#Titanium dioxide #nanoparticles #environmental risk #saturated porous media #solution chemistry #mobility #DLVO theory

Tài liệu tham khảo

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