Key Lab of Groundwater Resources and Environment (Ministry of Education), College of New Energy and Environment, Jilin University, 2519 Jiefang Road, Changchun, 130021, PR China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, 2519 Jiefang Road, Changchun, 130021, PR China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, College of New Energy and Environment, Jilin University, Changchun, 130021, PR China.
Key Lab of Groundwater Resources and Environment (Ministry of Education), College of New Energy and Environment, Jilin University, 2519 Jiefang Road, Changchun, 130021, PR China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, 2519 Jiefang Road, Changchun, 130021, PR China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, College of New Energy and Environment, Jilin University, Changchun, 130021, PR China.
Environ Pollut. 2024 Jan 1;340(Pt 1):122659. doi: 10.1016/j.envpol.2023.122659. Epub 2023 Oct 13.
Dye pollution is becoming increasingly severe. This study used the Schiff base reaction to synthesize a polyaromatic ring covalent organic polymer material with amide bonds and high electronegativity named SLEL-9 to adsorb Methylene Blue (MB) and Rhodamine B (RhB). SLEL-9 was characterized by Fourier transform infra-red spectra, X-ray photoelectron spectra, Brunauer-Emmett-Teller (BET), zeta potential analysis, and other techniques. It was found that SLEL-9 material contains C-C, CN, C-N, and CO. SLEL-9 had a zeta potential of about -45 mV under neutral conditions, which proved that the material had been synthesized successfully. The BET and Langmuir surface areas of SLEL-9 were 35.187 m g and 56.419 m g, respectively. The adsorptions of SLEL-9 on low concentration (10 mg L) Methylene Blue and Rhodamine B reached equilibrium within 48 h. The results showed that SLEL-9's adsorption of dye molecules are more consistent with pseudo-second-order kinetic and Langmuir isotherm model. The adsorption experiments showed that the adsorption process is a spontaneous endothermic reaction, mainly chemisorption. The maximum adsorption capacity of SLEL-9 for MB and RhB were 132.45 mg g and 101.94 mg g. In addition, this study investigated to determine the optimal reaction parameters. The primary mechanisms of SLEL-9 adsorption of two dyes are n→π* interaction, π-π EDA interaction and electrostatic attraction. Selective adsorb ability experiment results showed that SLEL-9 could selectively adsorb MB and RhB to a certain extent. Finally, it was found that SLEL-9 can maintain over 70% adsorption capacity after five reuses and can maintain stability after soaking in different pH water and organic solvents for 120 h. SLEL-9 proved to be a promising organic covalent polymer adsorption material for the removal of Methylene Blue and Rhodamine B in water.
染料污染日益严重。本研究利用希夫碱反应合成了一种具有酰胺键和高电负性的多环共价有机聚合物材料，命名为 SLEL-9，用于吸附亚甲基蓝（MB）和罗丹明 B（RhB）。SLEL-9 通过傅里叶变换红外光谱、X 射线光电子能谱、BET、Zeta 电位分析等技术进行了表征。结果表明，SLEL-9 材料含有 C-C、CN、C-N 和 CO。SLEL-9 在中性条件下的 Zeta 电位约为-45 mV，证明材料已成功合成。SLEL-9 的 BET 和 Langmuir 比表面积分别为 35.187 m²/g 和 56.419 m²/g。SLEL-9 对低浓度（10 mg/L）亚甲基蓝和罗丹明 B 的吸附在 48 h 内达到平衡。结果表明，SLEL-9 对染料分子的吸附更符合准二级动力学和 Langmuir 等温模型。吸附实验表明，吸附过程是自发的吸热反应，主要是化学吸附。SLEL-9 对 MB 和 RhB 的最大吸附容量分别为 132.45 mg/g 和 101.94 mg/g。此外，本研究还考察了确定最佳反应参数。SLEL-9 吸附两种染料的主要机制是 n→π* 相互作用、π-π EDA 相互作用和静电吸引。选择性吸附能力实验结果表明，SLEL-9 可以在一定程度上选择性地吸附 MB 和 RhB。最后发现，SLEL-9 经过五次重复使用后仍能保持 70%以上的吸附容量，在不同 pH 值的水中和有机溶剂中浸泡 120 h 后仍能保持稳定性。SLEL-9 被证明是一种很有前途的有机共价聚合物吸附材料，可用于去除水中的亚甲基蓝和罗丹明 B。
