Environmental sonochemistry,as an advanced oxidation process,involves the application of ultrasound to induce cavitation to destroy or accelerate the destruction of liquid-phase contaminants.This paper introduces the principle of environmental sonochemistry,including ultrasonic cavitation theory,mechanism of the ultrasonic degradation of contaminants and the generation of reactive radicals during sonolysis.Moreover,it reviews the progress in treatment of pollutants by using environmental sonochemistry in recent years.In addition,existing problems and future study directions are discussed.

The development of Chinese middle school chemistry textbooks,since the foundation of People's Republic of China,can be divided into five phases. The problems in the development lie in:the relation of social politics,ideology and the development of chemistry textbooks; the connection between theories in chemistry textbooks and practices in reality; the update of chemistry textbooks;the sequence in composing elements,compounds and basic theories;the accordance between the construction of academic knowledge and students' cognition;learning foreign chemistry textbooks etc.Review on those problems and revealing the laws behind the historical development can provide hints and enlightenment to the improvement of Chinese middle school chemistry textbooks.