Pickering emulsion for enhancing oxidative degradation of trichloroethylene nonaqueous-phase liquid in groundwater
YANG Shuo1, ZHAO Wen-chu2, YAN Xiu-lan2, ZHANG Dan1
1. Beijing Municipal Research Institute of Environmental Protection, National Engineering Research Centre of Urban Environmental Pollution Control, Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, Beijing 100037, China; 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Abstract：Four kinds of SiO2 particles were synthesized with different length to diameter (L/D) ratios to form oil -in-water Pickering emulsions so as to control the water/trichloroethylene (TCE) NAPL interface and improve TCE dissolution. The characteristics and stability of the formed Pickering emulsion and effects of colloidal particle concentration, ionic strength in water and water/NAPL ratio were investigated. Results showed that the droplets in the Pickering emulsion formed from SiO2 particles with L/D ratio of 2.3 had uniform size of 10µm and remained stable within 10 days. The emulsion index was up to 63% in this system. Moreover, the formed Pickering emulsion exhibited stability under low shear strain, facilitating groundwater in situ remediation. The results from comparing the kinetics of NAPL dissolution and oxidative degradation under Pickering emulsified and non-emulsified conditions indicate that Pickering emulsification could significantly elevate the dissolution rate of NAPL by increasing the interface area between the two phases, thereby achieve an increase in the degradation rate of NAPL phase pollutants.
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