纳米复合材料
刚果红
水溶液
吸附
亚甲蓝
Zeta电位
阳离子聚合
核化学
化学
朗缪尔吸附模型
降水
氢氧化物
化学工程
无机化学
材料科学
纳米颗粒
有机化学
纳米技术
催化作用
物理
光催化
气象学
工程类
作者
Yang Huang,Wei Yin,Tian-Lei Zhao,Meng Li,Qi-Zhi Yao,Gen‐Tao Zhou
出处
期刊:Nanomaterials
[MDPI AG]
日期:2023-03-23
卷期号:13 (7): 1145-1145
被引量:2
摘要
Organic dyes and heavy metals often coexist in industrial effluents, and their simultaneous removal is a grand challenge. Herein, a hydrochar and MgAl layered double hydroxide (HC–MgAlLDH) nanocomposite was prepared via a facile one-step hydrothermal route, and applied to remove anionic Congo red (CR), cationic Methylene blue (MB) and Pb(II) from aqueous solutions. The nanocomposite was formed by interweaving amorphous HC and crystalline MgAlLDH nanoplates and possessed more functional groups, lower zeta potential and larger specific surface area than uncomposited MgAlLDH. Batch removal experiments showed that the components HC and LDH dominated the CR and MB removals, respectively, whereas Pb(II) removal was conjointly controlled by the two components. The maximum Langmuir removal capacities of the nanocomposite to sole CR, MB, or Pb(II) were 348.78, 256.54 or 33.55 mg/g. In binary and ternary systems, the removal capacities of CR and MB only slightly decreased, while the capacity of Pb(II) increased by 41.13–88.61%. The increase was related to the coordination of Pb(II) with the sulfur-containing groups in dyes and the precipitation of PbSO4. Therefore, the simultaneous removal of CR, MB and Pb(II) was involved in a synergistic effect, including electrostatic adsorption, π–π interaction, coordination and precipitation. The present work shows that the HC–MgAlLDH nanocomposite has great potential for wastewater integrative treatment.
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