College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Shinan District, Qingdao, Shandong Province 266003, China.
College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Shinan District, Qingdao, Shandong Province 266003, China.
Bioresour Technol. 2020 Sep;311:123520. doi: 10.1016/j.biortech.2020.123520. Epub 2020 May 11.
A novel macroporous (150 μm) double network hydrogel (TR/PAA) was prepared from tea residue and acrylic acid, and its performance was systematically evaluated. The static adsorption experiments showed that gel exhibited high selectivity and adsorption capacity, ultrafast kinetics (10 min) for Cr(III), Pb(II) and Fe(III). The adsorption behavior showed heterogeneous and chemisorption process adsorption capacities of 206.19, 253.16, and 94.88 mg g for Cr(III), Pb(II) and Fe(III), respectively. In pluralistic systems, TR/PAA showed the adsorption order of Fe(III) > Cr(III) > Pb(II). Mechanism studies confirm that nitrogen and oxygen-containing functional groups play a major role in the adsorption process. In the fixed-bed column experiments, the treatment volume of simulated wastewater reached 1400 bed volumes (BV) (21.6 L), producing only 7 BV (323 mL) eluent. This work provides a new avenue for the combination of TR/PAA reuse and heavy metal removal, which is expected to be applied in actual wastewater treatment.
一种新型的大孔（约 150μm）双网络水凝胶（TR/PAA）由茶渣和丙烯酸制备，并对其性能进行了系统评价。静态吸附实验表明，该凝胶对 Cr(III)、Pb(II)和 Fe(III)具有高选择性和吸附容量，超快动力学（~10min）。吸附行为表现为非均相和化学吸附过程，对 Cr(III)、Pb(II)和 Fe(III)的吸附容量分别为 206.19、253.16 和 94.88mg/g。在多元体系中，TR/PAA 表现出 Fe(III) > Cr(III) > Pb(II)的吸附顺序。机理研究证实，含氮和含氧官能团在吸附过程中起主要作用。在固定床柱实验中，模拟废水的处理体积达到 1400 床体积（BV）（21.6L），仅产生 7BV（323mL）洗脱液。这项工作为 TR/PAA 再利用和重金属去除的结合提供了新的途径，有望应用于实际废水处理。
