This article makes an attempt to answer the three questions of why China is devoting its full effort to promoting a circular economy, what a circular economy is, and how to implement a circular economy in China. The evolutionary process of a circular economy in China, from introduction of the concept and the relevant actions of national decision making to demonstration of the system nationwide, has taken only around 6 years, with strong encouragement from politicians and the urgent need to cope with environmental pollution and a severe shortage of natural resources. The circular economy in China is now being actively implemented at three levels: enterprises, eco-industrial parks, and regions. The consolidated theoretical bases of ecology and economics have helped the circular economy to defi ne its position as a new economic model to effectively resolve the problems of resources and the environment. In this regard, material fl ow management is naturally a unique planning and management method for implementation of a circular economy, and eco-effi ciency is a good indicator to measure circular economic activities. Of particular signifi cance has been initiation of the legislative process for the Circular Economy Law, which is among a number of initiatives developing core policies for a circular economy in China. Stringent enforcement of a set of policies for energy saving and pollution abatement nowadays in China will certainly create an enabling environment for the development of a circular economy.

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To improve the photocatalytic effect of TiO 2 and the possibility of recycling, three different types of commercial activated carbon (AC) are used to prepare the TiO 2 /AC composite photocatalyst using the sol-gel method. The properties and catalytic activity of TiO 2 /AC composite are evaluated in comparison with bare TiO 2 , based on several characterization techniques and methylene blue (MB) photodegradation studies. The results show that the addition of AC

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