College of Environmental Science and Engineering, Hunan University, Lushan South Road, Yuelu District, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Lushan South Road, Yuelu District, Changsha 410082, PR China.
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou 510006, PR China.
Bioresour Technol. 2019 Oct;290:121793. doi: 10.1016/j.biortech.2019.121793. Epub 2019 Jul 11.
In this study, lignin extracted from rice husk was used to synthesis double network hydrogel adsorbent, named RH-CTS/PAM gel. RH-CTS/PAM gel exhibited macroporous structure and high buried water content, which gave rise to the exceptional adsorption performance. As results, in individual systems, the equilibrium time of Pb(II), Cu(II) and Cd(II) with initial concentration of 200 mg/L could be reached within 10 min, with the theoretical maximum adsorption capacity of 374.32, 196.68 and 268.98 mg/g, respectively. The adsorption rate and capacity of Pb(II), Cu(II) and Cd(II) in multicomponent systems were lower than that of individual systems. However, in a few cases of ternary system, higher adsorption rate and capacity was observed compare to binary systems. Adsorption mechanism indicated that both oxygen-containing and nitrogen-containing functional groups played a dominant role during the adsorption process, and mainly through chemical interaction along with a small amount of physical interaction.
在这项研究中，我们使用稻壳提取的木质素合成了双网络水凝胶吸附剂，命名为 RH-CTS/PAM 凝胶。RH-CTS/PAM 凝胶呈现出大孔结构和高结合水含量，这赋予了其出色的吸附性能。结果表明，在单一体系中，初始浓度为 200mg/L 的 Pb(II)、Cu(II)和 Cd(II)的平衡时间可在 10min 内达到，其理论最大吸附容量分别为 374.32、196.68 和 268.98mg/g。在多组分体系中，Pb(II)、Cu(II)和 Cd(II)的吸附速率和容量均低于单一体系。然而，在某些三元体系中，与二元体系相比，观察到更高的吸附速率和容量。吸附机制表明，含氧和含氮官能团在吸附过程中都发挥了主导作用，主要通过化学相互作用和少量的物理相互作用。
