Zhang Ying, He Qi, Yang Yonglin, Bai Qian
Department of Chemical Power Engineering, Shenmu Vocational & Technical College Yulin 719300 Shaanxi China
Production and Operation Department, Shenmu Electrochemical Development Co., Ltd Yulin 719300 Shaanxi China.
RSC Adv. 2024 Jul 15;14(31):22335-22343. doi: 10.1039/d4ra00588k. eCollection 2024 Jul 12.
Biochar was prepared using peanut shells as raw materials, and then composite amino-functionalized lignosulfonate was used to prepare a biochar/lignosulfonate adsorbent (BC-CLS). The morphology and structure of BC-CLS were characterized using FT-IR, SEM, zeta potential, and XPS. The adsorption performance of BC-CLS was evaluated by batch adsorption experiments and dynamic adsorption experiments (adsorption column flow adsorption). The results showed that BC-CLS adsorbent exhibited significant adsorption performance for Cu, including a short equilibrium time (50 min), fast adsorption rate (11 mg g min), and high static saturation adsorption capacity (354 mg g). Dynamic adsorption experiments indicated that the maximum adsorption capacity of BC-CLS adsorbent was approximately 280 mg g, with a removal rate of over 99% after five cycles, meeting the wastewater discharge standard (less than 1 mg L). The results demonstrated that the adsorption capacity of BC-CLS adsorbent for Cu was controlled by multiple adsorption mechanisms, including electrostatic attraction, precipitation, and metal ion complexation. Additionally, under pH = 5 conditions, using a 40 mg per L Cu solution, the adsorption performance of BC-CLS adsorbent remained above 60% after five adsorption-desorption experiments, indicating good cycling stability of BC-CLS adsorbent.
以花生壳为原料制备生物炭，然后用复合氨基功能化木质素磺酸盐制备生物炭/木质素磺酸盐吸附剂（BC-CLS）。采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、zeta电位和X射线光电子能谱（XPS）对BC-CLS的形态和结构进行表征。通过批量吸附实验和动态吸附实验（吸附柱流动吸附）评估BC-CLS的吸附性能。结果表明，BC-CLS吸附剂对铜具有显著的吸附性能，包括较短的平衡时间（50分钟）、较快的吸附速率（11毫克/克·分钟）和较高的静态饱和吸附容量（354毫克/克）。动态吸附实验表明，BC-CLS吸附剂的最大吸附容量约为280毫克/克，经过五个循环后去除率超过99%，符合废水排放标准（低于1毫克/升）。结果表明，BC-CLS吸附剂对铜的吸附容量受多种吸附机制控制，包括静电吸引、沉淀和金属离子络合。此外，在pH = 5条件下，使用每升含40毫克铜的溶液，经过五次吸附-解吸实验后，BC-CLS吸附剂的吸附性能仍保持在60%以上，表明BC-CLS吸附剂具有良好的循环稳定性。
