Efficient heavy metal removal from industrial melting effluent using fixed-bed process based on porous hydrogel adsorbents.
Efficient heavy metal removal from industrial melting effluent using fixed-bed process based on porous hydrogel adsorbents.
复制标题
基于多孔水凝胶吸附剂的固定床工艺有效去除工业熔融废水中的重金属。
DOI：
10.1016/j.watres.2017.12.067
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发表时间：
2018-03
期刊：
影响因子：
12.8
通讯作者：
Guiyin Zhou;Jinming Luo;Chengbin Liu;L. Chu;J. Crittenden
中科院分区：
文献类型：
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作者：
Guiyin Zhou;Jinming Luo;Chengbin Liu;L. Chu;J. Crittenden
在实际的吸附过程中，对吸附容量大、吸附动力学快、可重复使用、成本低的吸附剂提出了很高的要求。本研究以黄麻酸为原料，采用简单的自由基聚合法，制备了黄麻多孔型双网状聚丙烯酸凝胶。黄麻/聚丙烯酸酯水凝胶的高渗透性使其内部吸附部位完全暴露在金属离子中，水的质量分数约为80 。黄麻/PAA凝胶吸附剂能有效吸附熔融废水中的重金属，特别是Cd~(2+)和Pb~(2+)。该吸附剂对Cd~(2+)的吸附容量为401.7 mg/g，对Pb~(2+)的吸附容量为542.9 mg/g。用1 g/L吸附剂对40 mg/L的Cd~(2+)、Pb~(2+)在10 m in内达到吸附平衡。同时，对铅(C0= 188.6 mg/L)、镉(C0= 6.075 mg/L)、铜(C0= 9.325 mg/L)、锌(C0= 3.825 mg/L)、锰(C0= 17.05 mg/L)的去除效率分别达到81.0%、79.3%、83.4%、29.8%、22.3%。用1 g/ 吸附剂吸附2 h，冶炼废水中铬(C0= 0.25 mg/L)和铁(C0= 9.75 mg/L)的脱色率分别为96.2%和99.8%，其中铅、镉和铬的浓度均低于0.001 mg/L(4 g/L)。在固定床柱实验中，熔融废水的处理量达到2900BV(32.8 L)，仅产生50BV(565BV)的洗脱液。本工作开发了一种基于水凝胶吸附剂的高度实用的吸附工艺，用于去除实际废水中的重金属。
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.