摘要
Remediating soil contaminated with polycyclic aromatic hydrocarbons(PAHs)presents a significant environmental challenge due to their toxic and carcinogenic properties.Traditional PAHs remediation methodsdchemical,thermal,and bioremediationdalong with conventional soil-washing agents like surfactants and cyclodextrins face challenges of cost,ecological harm,and inefficiency.Here we show an effective and environmentally friendly calixarene derivative for PAHs removal through soil washing.Thiacalix[4]arene tetrasulfonate(TCAS)has a unique molecular structure of a sulfonate group and a sulfur atom,which enhances its solubility and facilitates selective binding with PAHs.It forms host-guest complexes with PAHs through p-p stacking,OH-p interactions,hydrogen bonding,van der Waals forces,and electrostatic interactions.These interactions enable partial encapsulation of PAH molecules,aiding their desorption from the soil matrix.Our results show that a 0.7%solution of TCAS can extract approximately 50%of PAHs from contaminated soil while preserving soil nutrients and minimizing adverse environmental effects.This research unveils the pioneering application of TCAS in removing PAHs from contaminated soil,marking a transformative advancement in resource-efficient and sustainable soil remediation strategies.
基金
support of the National Key Research and Development Program of China(Grant No.2019YFC1803804-02)
the Open Project of the Key Laboratory of Environmental Biotechnology,CAS(Grant No.kf2021008).
