High adsorption capacity, fast adsorption kinetics, good reusability and low cost are highly demanded for adsorbents used in practical adsorption process. In this study, a porous double network Jute/Polyacrylic acid (Jute/PAA) gel was prepared using simple free-radical polymerization of acrylic acid in Jute aqueous solution. The high permeability of Jute/PAA hydrogel with about 80 wt% water made internal adsorption sites fully expose to metal ions. The Jute/PAA gel adsorbent could efficiently adsorb heavy metals in melting wastewater, especially Cd²⁺ and Pb²⁺. The adsorbent showed very high adsorption capacities of 401.7 mg/g for Cd²⁺ and 542.9 mg/g for Pb²⁺. Moreover, the adsorption equilibrium reached within only 10 min for 40 mg/L of Cd²⁺ and Pb²⁺ using 1 g/L adsorbent. Meanwhile, the removal efficiencies reached 81.0% for Pb (C₀ = 3.825 mg/L), 79.3% for Cd (C₀ = 6.075 mg/L), 83.4% for Cu (C₀ = 9.325 mg/L), 29.8% for Zn (C₀ = 188.6 mg/L), 22.3% for Mn (C₀ = 17.05 mg/L), 96.2% for Cr (C₀ = 0.25 mg/L) and 99.8% for Fe (C₀ = 9.75 mg/L) in melting wastewater using 1 g/L adsorbent in 2 h. In particular, the concentrations of Pb, Cd and Cr decreased below 0.001 mg/L using 4 g/L adsorbent. In the fixed-bed column experiments, the treatment volume of melting wastewater reached 2900 BV (32.8 L) only producing 50 BV (565 mL) eluent. This work develops a highly practical adsorption process based on hydrogel adsorbents for the removal of heavy metals in actual wastewater.

对于实际吸附过程中使用的吸附剂，要求高吸附容量，快速吸附动力学，良好的可重复使用性和低成本。在这项研究中，使用简单的丙烯酸在黄麻水溶液中的自由基聚合反应制备了多孔的双网络黄麻/聚丙烯酸（黄麻/ PAA）凝胶。黄麻/ PAA水凝胶具有约80 wt％的水的高渗透性，使内部吸附位完全暴露于金属离子。黄麻/ PAA凝胶吸附剂可有效吸附熔融废水中的重金属，尤其是Cd ²⁺和Pb ²⁺。吸附剂显示出非常高的吸附能力，对Cd ^2+的吸附能力为401.7 mg / g，对Pb ^2+的吸附能力为542.9 mg / g。此外，使用1 g / L的吸附剂，对于40 mg / L的Cd ²⁺和Pb ²⁺，吸附平衡仅在10分钟内即可达到。同时，去除效率对Pb（达到81.0％C ^ ₀  = 3.825毫克/升），镉（79.3％C ^ ₀  = 6.075毫克/升），对Cu（83.4％C ^ ₀  = 9.325毫克/升），29.8％ Zn（C ₀  = 188.6 mg / L），Mn（C ₀  = 17.05 mg / L）22.3％，Cr（C ₀  = 0.25 mg / L）96.2％和Fe（C ₀ 在2小时内使用1 g / L吸附剂在融化废水中得到= 9.75 mg / L）。特别是，使用4 g / L吸附剂将Pb，Cd和Cr的浓度降低到0.001 mg / L以下。在固定床色谱柱实验中，熔融废水的处理量达到2900 BV（32.8 L），仅产生50 BV（565 mL）洗脱液。这项工作开发了一种基于水凝胶吸附剂的高度实用的吸附方法，用于去除实际废水中的重金属。