GZIST Professor He Qinyu’s Paper Published in an International Journal

  (Li Shuliang) On March 11, Professor He Qinyu and her team at Guangzhou Institute of Science and Technology (GZIST) published a research paper titled "Negative Magnetoresistance Effect in Pre-magnetized Decimeter-sized Zero-valent Iron Plate during Heavy Metal Removal" as the first author and corresponding author in Advanced Composites and Hybrid Materials, the engineering journal with the highest impact factor in the field of composite materials and devices (Impact Factor IF in 2023: 23.2). Guangzhou Institute of Science and Technology is the first affiliation of this paper, and Professor He Qinyu's paper is the lead article in the latest issue of this journal.
      With the development of electronic information technology, the heavy metal-containing wastewater generated by industries such as circuit board production is increasing day by day, and there is an urgent need for effective treatment technologies. Current treatment methods are cumbersome, having unsatisfactory removal effects, and being costly. Zero-valent iron technology is considered a promising material to solve these problems. However, zero-valent iron often faces problems such as surface oxidation and deposition during the removal of heavy metals. The deposited iron oxides and removed heavy metals are often amorphous, with low electrical conductivity, which hinders electrons from the core of zero-valent iron for participating in the reaction. This has been a bottleneck restricting the application of this technology.
      Professor He Qinyu and her team made zero-valent iron into iron sheets and pre-magnetized them in a specific direction of the iron sheet. For the first time, they proposed the concept of "the directional movement of reaction electrons forming a reaction current". It is believed that electrons inside zero-valent iron tend to move in the normal direction of the iron sheet surface to participate in the reduction reaction of heavy metals, thus forming a reaction (electron) current. When this reaction (electron) current passes through the amorphous layer in the shell of zero-valent iron, due to the influence of the magnetic field generated by the residual magnetism, a negative magnetoresistance effect occurs, and its electrical conductivity increases. Through this innovative solution, the team effectively solved the problem of low electrical conductivity of the amorphous layer of zero-valent iron and also made a breakthrough in its application in the field of heavy metal removal. The research results of this project have been authorized as an invention patent in the name of Guangzhou Institute of Science and Technology (Invention Patent Authorization Number: ZL ****11855370.9).
      The paper published by Professor He Qinyu is the journal paper with the highest impact factor among the papers published by teachers of our university so far, which fully demonstrates the excellent scientific research level of our teachers and researchers. Our institution will continue to encourage teachers and scientific research personnel to learn from Professor He Qinyu's rigorous, serious and dedicated scientific research spirit, actively engage in scientific research and the R & D of science and technology applications, and enhance our university's ability in scientific and technological innovation and serving economic and social development of our country.