Among various environmental problems, water pollution has drawn more and more attention. To develop an adsorbent with enhanced selectivity and high capacity for As (V) oxyanion, a novel lignin-based adsorbent was prepared by doping with N and modifying with Mg²⁺, using thiethylenetetramine (TETA) and MgCl₂ as the source of N and Mg²⁺, respectively. N-doped lignin (NL) shows a high selectivity for As (V), which is further enhanced by modifying with Mg²⁺ (MNL). MNL shows an excellent reusability. The adsorption isotherms and kinetics of MNL for As (V) follow Langmuir isotherms model and pseudo-second-order kinetics model, respectively. The adsorption of MNL for As (V) achieved a maximum adsorption capacity of 687.46 mg g⁻¹ and the equilibrium was established within 30 min. This study offers a novel idea on the recycle of the waste of paper industry and provides a new technology for As (V) adsorption from wastewater.

在各种环境问题中，水污染引起了越来越多的关注。为了开发对As（V）氧阴离子具有更高的选择性和高容量的吸附剂，使用噻吩四胺（TETA）和MgCl ₂作为N和N的源，通过掺杂N并用Mg ²⁺改性来制备新型的木质素基吸附剂。分别为Mg ²⁺。N掺杂的木质素（NL）对As（V）具有很高的选择性，通过用Mg ²⁺（MNL）进行修饰可以进一步提高选择性。MNL具有出色的可重用性。MNL对As（V）的吸附等温线和动力学分别遵循Langmuir等温线模型和拟二级动力学模型。MNL吸附As（V）的最大吸附容量为687.46 mg  g ^-1并在30 分钟内建立平衡。这项研究为造纸工业废物的回收利用提供了新思路，并为废水中的砷（V）吸附提供了一种新技术。