| 包坤,刘昱镔,张文倩.挺水植物秸秆对溶液中Cu2+的吸附研究[J].唐山学院学报,2024,37(6):1-9,33 |
| 挺水植物秸秆对溶液中Cu2+的吸附研究 |
| Study on Adsorption of Cu2+in Solution by Emergent Aquatic Plant Straw |
| 投稿时间：2024-07-26 |
| DOI：10.16160/j.cnki.tsxyxb.2024.06.001 |
| 中文关键词: 芦苇 香蒲 吸附剂 等温吸附 动力学 热力学 |
| 英文关键词: reed cattail adsorbent isotherm adsorption kinetic thermodynamics |
| 基金项目: |
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| 中文摘要: |
| 以挺水植物秸秆(芦苇和香蒲)为原料制备吸附剂,考察吸附剂的用量(g)、溶液pH值和吸附时间(min)对溶液中Cu2+吸附性能的影响,并对其等温吸附特征、吸附动力学和吸附热力学进行研究。结果表明:当吸附剂用量为0.15 g,pH值为6.0时,对溶液中的Cu2+具有很好的去除率,在240 min时达到吸附平衡;吸附过程同时符合Langmuir和Freundlich等温吸附模型以及Lagergren准二级动力学模型,且颗粒内扩散阶段不是吸附过程的控速关键阶段;热力学参数△G0＜0,△H0＞0和△S0＞0表明吸附过程为自发、吸热和熵增的过程,对溶液中的Cu2+均具有较好的亲和力;相同条件下,两种吸附剂对Cu2+的吸附效果表现为香蒲＞芦苇。 |
| 英文摘要: |
| Adsorbents were prepared from emergent aquatic plant straws (reed and cattail), and then the effects of adsorbent dosage (g), solution pH and adsorption time (min) on the adsorption performance of Cu2+ in the solution were investigated, and its isothermal adsorption characteristics, adsorption kinetics and adsorption thermodynamics were studied. The results show that an optimal Cu2+ removal efficiency is achieved when the adsorbent dosage is 0.15 g and the pH value is 6.0, with adsorption equilibrium reached at 240 min; The adsorption process adheres to both the Langmuir and Freundlich isothermal adsorption models, as well as to the pseudo second-order kinetic model, and the intraparticle diffusion stage is not the key rate-controlling stage in the adsorption process; The thermodynamic parameters(△G0＜0, △H0＞0 and △S0＞0) indicate that the adsorption process is spontaneous, endothermic and entropy-increasing, and has a relatively strong affinity for Cu2+ in the solution; Under identical conditions, the adsorption efficiency of Cu2+ by the two adsorbents follows the order: cattail＞reed. |
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