Tungsten Trioxide Photocatalyst Solves Mercury Pollution

In June, a primary school of Huayuan County of Hunan Province, China, occurred a serious mercury poisoning (Minamata disease) of many students, which resulted in 147 students urine mercury exceeded; its cause is a fifth-grade student took 50 ml of the remaining mercury in the wok of a waste workshop in a mineral water bottle to school, and gave it to the other students for playing. According to the source, this workshop was illegal constructed and operated unauthorized without Environmental Impact Assessment (EIA) and related procedures. For this accident, I am showing my deep sadness, someone innocent was suffered a serious injury because some unscrupulous manufacturers do not manage their hazardous substances.

 

China as the largest country which uses and emissions most  in global mercury, and has faced with the tremendous pressure to reduce emissions of mercury reductions in the "global mercury instrument" negotiations. This year, on June 18th to 19th, "the second national mercury pollution control and monitoring technology seminar" held in Yancheng, Jiangsu Province of China, the main focus of the meeting lies in deeply discussing the hot spots and focus issues of the policy standards mercury pollution control and monitoring in the field of technical support, solutions, industry trends, monitoring system and management system, and so on; furthermore, it provided decision supporting to in facing with the mercury pollution problems of socio-economic development process.

 

Mercury is a quite rare element in the earth's crust, which is the only kind of liquid metal. Mercury pollution (Hg²⁺) is one of the major heavy metal pollutions in the water, which has lethal hazards on the human nervous system. Studies have shown that, in the photocatalytic reduction experiment of Hg²⁺ of tungsten trioxide photocatalyst, Hg²⁺ was strongly adsorbed on surface of tungsten trioxide, and its adsorption amount increased as the increasing of pH value. In addition, experiments found that the adsorbed Hg²⁺ by tungsten trioxide still exist in the form of oxidation states which means it won’t occur reduction. Thus, Hg²⁺ in the wastewater has been taken by the photocatalyst, to eliminate mercury pollution. In addition, the recovery of Hg²⁺can be separated with the photocatalyst, and then through the certain supporting of technical to recycle the mercury, and to realize resources recycling.

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