Lan Lei,Rui Zhang,Rui-Xiang Bi,Zhi-Hai Peng,Xin Liu,Tie-Ying Shi,Li Zhang,Ru-Ping Liang,Jian-Ding Qiu
Improper treatment of uranium wastewater from rare earth tailings can have detrimental effects on ecosystems and human health. Therefore, it is crucial to develop effective methods for uranium removal to ensure safe discharge. Herein, we present a novel hydrogel composite (GTA-2D MMT) synthesized through self-assembly, integrating gum tragacanth (GT) functionalized with amidoxime groups and exfoliated two-dimensional montmorillonite (2D MMT). This hydrogel capitalizes the high cation exchange capacity and abundant functional groups of 2D MMT to enhance mechanical strength while mitigating the excessive volume expansion commonly observed in polysaccharide-based hydrogels. The aluminum hydroxyl and oxygen atoms at the edges of 2D MMT interact with the amino group of the GT, restricting polymer chain mobility and improving structural stability. With an adsorption capacity of up to 441.32 mg g-1, GTA-2D MMT exhibits an excellent uranium removal efficiency of 94.6% in tailings wastewater while maintaining its structural integrity through multiple regeneration cycles. These results highlight the potential of GTA-2D MMT as a robust and eco-friendly adsorbent for uranium remediation, advancing the design of high-performance materials for wastewater treatment.
Junji Zhao,Xueyan Qiu,Xiaomei Liu,Xie Ye,Hongran Xiong,Yan Liang,Ziqiang Lei
In this study, the application of superabsorbent resin (SAP) in inhibiting the soil moisture evaporation (or slowing down the water outflow) was studied. The clay-SAP composites were fabricated by grafting of poly (acrylic acid-N-hydroxymethyl acrylamide/clay) (GT-g-P [AA-co-NHA]/clay) on Tragacanth gum (GT), using solution polymerization. The structure, morphology and stability of the clay-SAP composites were investigated by Fourier transform infrared, scanning electron microscope and TGA. The maximum swelling ratio of Attapulgite (3%)-, Kaolin (3%)- and Montmorillonite (3%)-SAP composite in deionized water reached 1180, 819 and 525 g/g respectively, and the maximum swelling ratio in tap water reached up to 206, 192 and 170 g/g respectively. Meanwhile, the maximum swelling ratio in 0.9% NaCl solution was 95, 82 and 62 g/g respectively. The water retention of clay-SAP composites was also analyzed as a function of temperature. In addition, by simulating the desertification area, the effect of the APT (3%)-SAP composite on the anti-evaporation performance was studied. The obtained results revealed that the water retention of APT (3%)-SAP composite was 36% at 45°C for 12 h. Under natural conditions, the evaporation rate of the anti-evaporation material was inversely proportional to the amount of APT (3%)-SAP composite added.
危险品化学品经营许可证（带存储）