Mercury is an important industrial raw material. A large number of mercury and its compounds are widely used in batteries, plastics, mercury containing pesticides, chlor alkali industry and other industries, which bring serious harm to human health. Therefore, the treatment of mercury pollution has become a highly valued problem in the field of global environmental science and technology. At present, the treatment methods of mercury containing wastewater mainly include chemical precipitation, electrochemical method, ion exchange method and adsorption method, but there are some shortcomings, such as small adsorption capacity, long adsorption time, poor selectivity, difficult separation, easy to cause secondary pollution and so on. Therefore, it is of great significance to research and develop new environmental friendly adsorbents with large adsorption capacity, selectivity and easy separation from aqueous solution.
In recent years, Wang Chuanyi, a distinguished professor of Shaanxi University of science and technology, has carried out a series of research on heavy metal ion adsorption and separation materials and obtained significant results (see: chem. Eng. J., 2019, 358, 253-263; J. colloid Inter. SCI., 2019, 554, 479-487 (editor's choice); chem. Eng. J., 2019, 363, 192-202; environ. Chem. Lett., 2018, 16 (2), 653-658; chem. Eng J. , 2017, 311, 236-246, etc.).
Recently, on the basis of previous research, the team's researchers used lignin as the skeleton, glutaraldehyde as the crosslinking agent, hyperbranched polyethyleneimine and chitosan to prepare porous polyethyleneimine functional chitosan / lignin composite sponge adsorbent with semi interpenetrating three-dimensional network structure. The adsorbent contains a large number of amino functional groups which can chelate mercury ions. It can remove mercury ions in water quickly, efficiently and selectively. The experimental results show that the adsorbent can adsorb 83.5% more mercury ions than the final adsorption capacity (663.5 mg / g) in one minute. In addition, the selectivity coefficients of mercury ions are three orders of magnitude higher than those of copper ions, cadmium ions and lead ions respectively (see Figure 1). This is mainly due to the porous structure composed of networked nanowalls in the composite sponge, which increases the distribution of functional groups, thus exposing more active sites, leading to the rapid complexation of mercury ions with surface functional groups, thus accelerating the process of chemical adsorption (as shown in Figure 2).
Figure 1. Adsorption kinetics and selective adsorption of mercury ion in water by new composite sponge
Figure 2. Schematic diagram of fast response adsorption mechanism of new composite sponge
The rapid response environmental adsorbent is of great significance for the treatment of unpredictable and uncontrollable heavy metal pollution emergencies, reducing adsorption time and treatment cost. At the same time, the developed new composite sponge has the advantages of environmental protection, high efficiency, low cost, stable mechanical properties, simple practical application and operation, and has a broad application prospect in the treatment of mercury containing wastewater.
The research results were recently published in Environmental Science: nano, the world's top journal in the field of environmental science. After the publication of the paper, it was highly recognized by the international peers, and was selected as the top 10% hot article by the editorial department. The first author of this paper is Zhang Dan, a doctoral student under the guidance of Professor Wang Chuanyi.
The research work was supported by NSFC, international innovation research team of the State Administration of foreign experts and other projects.
Original text (scan or long press QR code, and then go to the original page after identification): new polyphylene functionalized chitosan – lignin composite sport with nanowall network structures for fast and efficient removal of Hg (II) ions from aqueous solution Dan Zhang, LAN Wang, Hehua Zeng, Baker rhimi, Chuanyi wangenviron. SCI. Nano, 2020, 7, 793-802, DOI: 10.1039/C9EN01368G
Tutor introduction
Wang Chuanyi, Humboldt scholar in Germany, member of Royal Society of chemistry, winner of "hundred talents plan" of Chinese Academy of Sciences (excellent final evaluation), special researcher of Chinese Academy of Sciences, special expert of Shaanxi Province, special professor and doctoral supervisor of Shaanxi University of science and technology, international innovation team of "water pollution monitoring technology in arid area" of Chinese Academy of Sciences and State Administration of foreign affairs and "micro nano environmental function" of Chinese Academy of Sciences Director of cross innovation team of material structure design, surface interface behavior and its application, member of photochemistry Professional Committee of China Renewable Energy Society, member of photocatalysis Professional Committee of China photosensitive society and special director of China Environmental Science Society. In addition, he was invited to serve as deputy editor in chief of Environmental Chemistry Letters (Springer nature), Editorial Committee and guest editor of six international journals such as scientific reports, reviewer of more than 20 international journals such as J. am. Chem. SOC., evaluation expert of national science and Technology Award Committee and project evaluation expert of Ministry of science and technology, National Foundation Committee, Ministry of education and Chinese Academy of Sciences.
Mainly engaged in energy and environmental related nano photocatalysis and surface / interface physical chemistry, environmental pollution control functional materials and technology research. He has published more than 180 papers in the international important academic journals such as chemical reviews, JACS, nature communications, angel. Chem. Int. ed., ACS Nano, EST, etc., which have been cited more than 6000 times by others, edited one English monograph, and applied for more than 70 Chinese invention patents (more than 50 of which have been authorized). He has won the Humboldt Scholar Award of Germany (1998), the second prize of science and technology award of China Society for materials research (2011), China Tianshan Award (2014), the final evaluation award of "one hundred talents program" of Chinese Academy of Sciences and the contribution award of Chinese overseas Chinese community (innovative talents, 2016).
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