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Synthesis of composites from coal gasification slag by acid leaching and NaOH activation for efficient adsorption of methylene blue
Applied Surface Science ( IF 6.3 ) Pub Date : 2024-09-07 , DOI: 10.1016/j.apsusc.2024.161186
Zhaojing Li , Yaoping Chen , Duiyu Wang , Ke Yang , Jiahao Sun

This study successfully developed a carbon-silicon composite material (C-Si@GS) by acid leaching (HCl) and alkali activation (NaOH) treatments from solid waste CGS and applied to the adsorption of methylene blue (MB). The effects of material dosage, pH, contact time, initial concentration and co-existing ions on the removal of MB were investigated. The results revealed C-Si@GS had good adsorption performance at different pH and cations, suggesting that the material had stable properties. The adsorption of MB by C-Si@GS reached the equilibrium within 12 h, and the removal rate was up to 99 %. The maximum adsorption capacity of C-Si@GS was 456.8 mg/g calculated by Langmuir model (C0 (MB) = 120 mg/L, pH=7 ± 0.2, dosage = 0.6 g/L, and T=298 K). The adsorption process is consistent with Pseudo-secondary and Freundlich models, suggesting that both physical and chemical adsorption processes coexist. Adsorption mechanisms are mainly van der Waals forces, hydrogen bonding, electrostatic attraction and π-π bond interaction, as analyzed by XPS and FT-IR. The composites were regenerated using HCl as desorption agent and the removal rate was about 50 % after 3 cycles. The results illustrated that C-Si@GS can serve as an effective adsorbent for removing MB.

中文翻译:


酸浸和 NaOH 活化法以煤气化渣为原料合成复合材料,高效吸附亚甲蓝



本研究通过酸浸 (HCl) 和碱活化 (NaOH) 处理,以固体废物 CGS 为原料,成功开发了一种碳硅复合材料 (C-Si@GS),并应用于亚甲基蓝 (MB) 的吸附。研究了材料用量、pH 值、接触时间、初始浓度和共存离子对 MB 去除的影响。结果表明,C-Si@GS在不同 pH 值和阳离子下具有良好的吸附性能,表明该材料具有稳定的性能。C-Si@GS 对 MB 的吸附在 12 h 内达到平衡,去除率高达 99 %。Langmuir 模型计算 C-Si@GS 的最大吸附量为 456.8 mg/g(C0 (MB) = 120 mg/L,pH=7 ± 0.2,剂量 = 0.6 g/L,T=298 K)。吸附过程与 Pseudo-secondary 和 Freundlich 模型一致,表明物理吸附过程和化学吸附过程共存。XPS 和 FT-IR 分析的吸附机制主要是范德华力、氢键、静电吸引和 π-π 键相互作用。使用 HCl 作为解吸剂对复合材料进行再生,3 次循环后去除率约为 50 %。结果表明,C-Si@GS 可以作为去除 MB 的有效吸附剂。
更新日期:2024-09-07
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