Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China; Engineering Research Center of Forestry Biomass Materials and Energy, Ministry of Education, Beijing Forestry University, Beijing 100083, China.
Key Lab for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Bioresour Technol. 2023 May;376:128841. doi: 10.1016/j.biortech.2023.128841. Epub 2023 Mar 9.
Here, a Cu-doped lignin-based adsorbent (Cu-AL) was fabricated via the amination and Cu-doping of industrial alkali lignin for massive and selective adsorption of cationic dyes azure B (AB) and saffron T (ST). The Cu-N coordination structures endowed Cu-AL with stronger electronegativity and higher dispersity. Through the electrostatic attraction, π-π interaction, H-bonding, and Cu coordination, the adsorption capacities of AB and ST reached up to 1168 and 1420 mg g, respectively. The pseudo-second-order model and Langmuir isotherm model were more relevant to the AB and ST adsorption on Cu-AL. Based on the thermodynamic study, the adsorption progresses were endothermic, spontaneous, and feasible. The Cu-AL maintained high removal efficiency to dyes after 4 reuses (>80%). Importantly, the Cu-AL could efficiently remove and separate AB and ST from dye mixtures even in real time. All the above characteristics demonstrated that Cu-AL was an excellent adsorbent for fast wastewater treatment.
在这里，通过工业堿木质素的胺化和铜掺杂制备了一种铜掺杂的木质素基吸附剂（Cu-AL），用于大规模和选择性地吸附阳离子染料亚蓝 B（AB）和藏红花 T（ST）。Cu-N 配位结构赋予了 Cu-AL 更强的电负性和更高的分散性。通过静电吸引、π-π 相互作用、氢键和 Cu 配位，AB 和 ST 的吸附容量分别达到了 1168 和 1420mg/g。AB 和 ST 在 Cu-AL 上的吸附更符合准二级动力学模型和 Langmuir 等温吸附模型。基于热力学研究，吸附过程是吸热的、自发的和可行的。Cu-AL 在 4 次重复使用后（>80%）仍能保持对染料的高去除效率。重要的是，Cu-AL 即使在实时条件下也能有效地从染料混合物中去除和分离 AB 和 ST。所有这些特性表明，Cu-AL 是一种用于快速废水处理的优良吸附剂。
