Heavy metal pollution in water has become one of the most serious environmental problems in the world today. Adsorption method is the most common method for treating heavy metal wastewater. Previous research on adsorption materials has mostly focused on the preparation method and adsorption capacity, and it is rarely considered the potential pollution of hazardous waste adsorbent . Recently, Professor Zhang Xiaotao, an innovation team of the research team of Professor Zhang Xiaotao of the efficient utilization of sand and shrub resources at Inner Mongolia Agricultural University, has made important breakthroughs in the high-value conversion of biomass adsorbents and hazardous waste adsorbents. Related results "Adsorption of Zn(II) on ablation@wood-aerogel and high-value reuse to ZnO/ZnS as an efficient photocatalyst) were published as the back cover in the internationally renowned journal Journal of Materials Chemistry A.
Related achievements As the back cover article of internationally renowned journal
According to reports, traditional biomass adsorbent materials have great restrictions on their application due to their complex preparation process, low adsorption capacity, and difficulty in adsorption separation. Previous research on heavy metal adsorption materials has mostly focused on the preparation process of adsorption materials and the improvement of adsorption capacity, but has ignored a very serious problem, that is, the adsorbent after adsorption of heavy metals is like a "time bomb" and may cause secondary pollution to the ecological environment and human health at any time. Therefore, it is crucial to explore new strategies for the high-value conversion and utilization of hazardous waste adsorbents, and designing block adsorbents with high adsorption capacity and easy recycling.
Aminized wood aerogel and in situ constructing ZnO/ZnS heterojunction
The scientific research team used the fast-growing timber poplar as raw material and used a top-down modification method to design a block-like adsorption material amyoptized wood aerogel (AWA) that is easy to recover and has a high adsorption capacity (400 mg/L, 297.03 mg/g) for heavy metal Zn (II). At the same time, the scientific research team proposed for the first time a new high-value conversion and utilization strategy for hazardous waste adsorbents, that is, in-situ chemical deposition method is used to convert Zn (II) adsorbed on the surface of AWA into ZnO/ZnS heterojunction photocatalyst (ZnO/ZnS@AWA), and further used to photocatalyze the degradation of azo dye Congo red. The adsorption centers (-OH, -COOH, -NH2) on the AWA surface ensure that ZnO/ZnS can evenly cover the AWA surface and have strong interface bonding strength. Through the synergistic degradation mechanism of adsorption and photocatalysis, the photocatalytic degradation of Congo red (40 mg/L, 98.84%) by ZnO/ZnS@AWA was successfully achieved. This work proposes a new preparation plan for wood-based block adsorbent materials, which can be used to control the pollution of heavy metals to the water resources and environment. At the same time, a high-value conversion and utilization technology for hazardous waste adsorbents was creatively developed, providing a new way to solve the secondary pollution problem of heavy metal hazardous waste adsorbents.
The research relies on the key laboratory of fibrosis and energy development and utilization of Shasheng shrub resources in Inner Mongolia Autonomous Region, and has received support from the National "13th Five-Year Plan" Key R&D Plan, Inner Mongolia Autonomous Region Natural Science Foundation Project , Inner Mongolia Agricultural University High-level Talent Introduction and Research Launch Project, Inner Mongolia Autonomous Region Science and Technology Achievements Transformation Project, Inner Mongolia Autonomous Region "Grassland Talent" Project Youth Innovation and Entrepreneurship Talent Project, and Inner Mongolia Agricultural University College Student Science and Technology Innovation Fund.
paper link:
https://pubs.rsc.org/en/content/articlelanding/2022/ta/d2ta05001c
(Source: Basic Research Department of the Autonomous Region Science and Technology Department)
