BEIJING - Chinese researchers have developed a nano material using waste cartons that can remove a toxic heavy metal from water.The breakthrough has provided a new means to control heavy metal contamination and recycling of waste cartons.Incidents of heavy metal contamination of water have occurred frequently in China in recent years, and hexavalent chromium, a chemical compound of metal chromium and major cause of heavy metal pollution, can lead to significant risks to human health. There is an urgent need for low cost and high efficiency technology to deal with heavy metal water contamination in China.Researchers used high temperatures and pressure to create the nano material from waste cartons. The material can be coated with nano-scale iron which can effectively remove hexavalent chromium from water, control the migration of the compound in water sources, and prevent it from being absorbed by plants.The research, led by Wu Zhengyan at Hefei Institute of Physical Science under Chinese Academy of Sciences, was recently published in the American Chemistry Society academic journal ACS Langmuir. purple rubber braceletchristian silicone wristbandssilicone rubber wristbandsrubber bracelets animalssilicone bracelet usb flash drive
MACAO - The passport holders of China's Macao Special Administrative Region (SAR) visiting the Republic of Rwanda can apply for a visa upon arrival for a maximum stay of 30 days, the authority said on Thursday.Meanwhile, the passport holders of Macao SAR visiting the Republic of Rwanda can also choose to apply for an electronic visa before departure.Moreover, Macao SAR passport holders can apply for visas upon arrival in the Republic of Togo for a maximum stay of seven days.At present, a total of 141 countries and regions have agreed to grant visa-free access or visa-on-arrival to Macao SAR passport holders.
