Ultrarapid Multimode Microwave Synthesis of Nano/Submicron ß-SiC.

This paper presents the design, development and realization of a fast and novel process for the synthesis of 3C silicon carbide (ß-SiC) nanorods and submicron powder. Using SiO2 (or Si) and activated carbon (AC), this process allows ß-SiC to be synthesized with almost 100% purity in timeframes of seconds or minutes using multimode microwave rotary tube reactors under open-air conditions. The synthesis temperature used was 1460 ± 50 °C for Si + AC and 1660 ± 50 °C for SiO2 + AC. The shortest ß-SiC synthesis time achieved was about 20 s for Si + AC and 100 s for SiO2 + AC. This novel synthesis method allows for scaled-up flow processes in the rapid industrial-scale production of ß-SiC, having advantages of time/energy saving and carbon dioxide emission reduction over comparable modern processes.

The development of WEEE management and effects of the fund policy for subsidizing WEEE treating in China.

The consumption of electrical and electronic equipment is surging, so is the generation of waste electrical and electronic equipment (WEEE). Due to the large quantity, high potential risk and valuable capacity of WEEE, many countries are taking measures to regulate the management of WEEE. The environmental pollution and human health-harming problems caused by irregular treatment of WEEE in China make the government pay more and more attention to its management. This paper reviews the development of WEEE management in China, introduces the new policy which is established for WEEE recycling and especially analyzes the effectiveness of the policy, including huge recovery, formation of new recycling system, strict supervision to related enterprises, and the stimulation to public awareness. Based on the current achievement, some recommendations are given to optimize the WEEE management in China.