Abdel Salam Jehan, Saleh Amina A, El Nenaiey Toqa Taha, Yang Hu, Shoeib Tamer, El-Sayed Mayyada M H
Department of Chemistry, School of Sciences and Engineering, The American University in Cairo, AUC Avenue, P.O. Box 74, New Cairo, 11835 Cairo, Egypt.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, P. R. China.
ACS Omega. 2023 May 30;8(23):20697-20707. doi: 10.1021/acsomega.3c01254. eCollection 2023 Jun 13.
There is an increasing need to find cost-effective and sustainable solutions for treating wastewater from contaminants of emerging concern (CECs). In this regard, cape gooseberry husk-typically an agri-food waste-is investigated for the first time as a potential biosorbent for the removal of model pharmaceutical contaminants of caffeine (CA) and salicylic acid (SA) from water. Three different preparations of husks were investigated and characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller analysis, zeta potential, and point of zero charge measurements. The activation of the husk led to an increase in the surface area, pore volume, average pore size, and adsorption favorability. The single-component adsorption of SA and CA onto the three husks was investigated at different initial concentrations and pH values to determine the optimal operating conditions. The maximal removal efficiencies of SA and CA reached up to 85 and 63%, respectively, for the optimal husk which also offers a less energy-intensive option in its activation. This husk also exhibited high rates of adsorption that exceeded other husk preparations by up to four times. It was proposed that CA interacts electrostatically with the husk, while SA binds through weak physical interactions (e.g., van der Waals and H-bonding). In binary systems, CA adsorption was highly favored over SA adsorption, owing to its electrostatic interactions. The selectivity coefficients α varied with initial concentration and ranged between 61 and 627. The regeneration of husk was also successful resulting in its re-use for up to four full consecutive cycles, further demonstrating the efficiency of cape gooseberry husk use in wastewater treatment.
寻找具有成本效益和可持续性的新兴关注污染物（CECs）废水处理解决方案的需求日益增长。在这方面，灯笼果壳——通常是一种农业食品废料——首次被研究作为从水中去除咖啡因（CA）和水杨酸（SA）等模型药物污染物的潜在生物吸附剂。研究了三种不同的果壳制剂，并使用傅里叶变换红外光谱、扫描电子显微镜、布鲁诺尔-埃米特-泰勒分析、zeta电位和零电荷点测量对其进行了表征。果壳的活化导致表面积、孔体积、平均孔径和吸附亲和力增加。研究了SA和CA在三种果壳上在不同初始浓度和pH值下的单组分吸附，以确定最佳操作条件。对于最佳果壳，SA和CA的最大去除效率分别达到85%和63%，其活化过程也提供了一种能源密集度较低的选择。这种果壳还表现出高达四倍于其他果壳制剂的高吸附速率。有人提出，CA与果壳发生静电相互作用，而SA通过弱物理相互作用（如范德华力和氢键）结合。在二元体系中，由于其静电相互作用，CA的吸附比SA的吸附更受青睐。选择性系数α随初始浓度而变化，范围在61至627之间。果壳的再生也很成功，可连续重复使用多达四个完整循环，进一步证明了灯笼果壳在废水处理中的有效性。
