Enzymatic saccharification is widely used for producing sugars from woody biomass while generating hydrolysis lignin as a by-product. Hydrolysis lignin produced in this saccharification process is under-utilized due to its poor solubility and reactivity. In this paper, hydrolysis lignin (HL) was polymerized with acrylic acid (AA) by using potassium persulfate as the initiator under alkaline aqueous conditions to produce coagulant and adsorbent to be used as aids in wastewater treatment processes. The polymerization produced soluble anionic polymers with a solubility of 5.1 g/L, charge density of − 6 mmol/g, and molecular weight of 3.8 × 10⁵ g/mol. This soluble AA-g-HL polymer removed 95% cationic dye (basic blue 41) from an aqueous system at 1.2 g/g by forming polyelectrolyte complexes with dye molecules. The insoluble AA-g-HL polymer removed 46% of cationic dye at the dosage of 3 g/g via adsorption. Experimental data were fitted into various isotherm and kinetic models to identify the best description of the adsorption systems, and the corresponding thermodynamic parameters were determined. The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of dye (227 mg/g) on insoluble AA-g-HL was higher than that (52 mg/g) on HL. The kinetics data followed the pseudo-second model. The thermodynamic parameters indicated that adsorption onto AA-g-HL was an exothermic spontaneous process. Both the mean free energy and the magnitude of free enthalpy change verified that the main mechanism was physical adsorption.

酶促糖化广泛用于从木质生物质生产糖，同时产生水解木质素作为副产物。在该糖化过程中产生的水解木质素由于溶解性和反应性差而未被充分利用。在本文中，以过硫酸钾为引发剂，在碱性水溶液条件下，水解木质素（HL）与丙烯酸（AA）聚合制备混凝剂和吸附剂，用作废水处理过程中的助剂。聚合生成可溶性阴离子聚合物，溶解度为 5.1 g/L，电荷密度为 − 6 mmol/g，分子量为 3.8 × 10 ⁵ 克/摩尔。这种可溶性 AA-g-HL 聚合物通过与染料分子形成聚电解质复合物，以 1.2 g/g 从水性体系中去除了 95% 的阳离子染料（碱性蓝 41）。不溶性 AA-g-HL 聚合物以 3 g/g 的剂量通过吸附去除了 46% 的阳离子染料。将实验数据拟合到各种等温线和动力学模型中，以确定吸附系统的最佳描述，并确定相应的热力学参数。Langmuir 等温线模型表明，染料对不溶性 AA-g-HL 的最大理论吸附容量（227 mg/g）高于在 HL 上的（52 mg/g）。动力学数据遵循伪秒模型。热力学参数表明吸附到 AA-g-HL 上是一个放热自发过程。