Sun Weixu, Liu Tao, Xia Kai, Zhou Jingye, Liu Xin, Zhang Xiaodong
College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China.
ACS Omega. 2022 Apr 7;7(15):13243-13253. doi: 10.1021/acsomega.2c00690. eCollection 2022 Apr 19.
It is a great challenge to sustainably produce and apply water-based coatings and inks in terms of realizing the green resource utilization of polyacrylate latex solid waste (PLSW) and avoid its secondary pollution. In this paper, a kind of high value-added amphoteric ion-exchange resin (AIER) was prepared by using diethylenetriamine to amidate PLSW under the optimized conditions from a Box-Behnken design. Its adsorption and regeneration properties and the universality of the method were investigated. The results suggested that AIER possessed a high removal efficiency to anionic dyes, and the batch dye adsorption processes were endothermic and spontaneous, which is consistent with a pseudo-second-order kinetic model. The penetration adsorption capacities of AIER were recorded to be 987.08 mg/g for RR239 and 1037.75 mg/g for RB5 at the optimized operating conditions of column height = 6.4 cm, flow rate = 1 mL/min, and dye solution of 500 mg/L. They were more than 200 times larger than that of commercial activated carbon when the mixture composed of AIER particle and diatomite particle (filter aid agent) was used as a fixed-bed adsorbent. Zeta potential analysis results indicated that the good adsorption and regeneration performances of AIER were mainly attributed to the presence of amino and carboxyl groups in the molecular structure of AIER. Most importantly, this method possessed excellent practicability and universality for different types of PLSW from factory wastewater. The results provide a feasible method and theoretical basis for the green resource utilization of PLSW, and the goal of "waste control by waste" was fundamentally achieved.
在实现聚丙烯酸酯胶乳固体废物（PLSW）的绿色资源利用并避免其二次污染方面，可持续生产和应用水性涂料及油墨是一项巨大挑战。本文通过二乙烯三胺对PLSW进行酰胺化反应，在Box-Behnken设计优化的条件下制备了一种高附加值的两性离子交换树脂（AIER）。研究了其吸附与再生性能以及该方法的通用性。结果表明，AIER对阴离子染料具有较高的去除效率，批量染料吸附过程是吸热且自发的，这与准二级动力学模型一致。在柱高 = 6.4 cm、流速 = 1 mL/min以及500 mg/L染料溶液的优化操作条件下，AIER对RR239的穿透吸附容量为987.08 mg/g，对RB5的穿透吸附容量为1037.75 mg/g。当将AIER颗粒与硅藻土颗粒（助滤剂）的混合物用作固定床吸附剂时，它们比商业活性炭的吸附容量大200多倍。Zeta电位分析结果表明，AIER良好的吸附和再生性能主要归因于其分子结构中氨基和羧基的存在。最重要的是，该方法对于来自工厂废水的不同类型PLSW具有出色的实用性和通用性。研究结果为PLSW的绿色资源利用提供了可行的方法和理论依据，从根本上实现了“以废治废”的目标。
