Ultrathin dodecyl-sulfate-intercalated Mg-Al layered double hydroxide nanosheets with high adsorption capability for dye pollution

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:577

Article

Lei, Siqi¹  Wang, Sinong²  Gao, Boxu³  Zhan, Yulu³  Zhao, Qiancheng³  Jin, Shanshan²  Song, Guoxin¹  Lyu, Xinchun¹  Zhang, Yahong³  Tang, Yi³ 

[1] Fudan Univ, Res Ctr Anal & Measurement, Shanghai 200433, Peoples R China

[2] Fudan Univ, Fudan Univ Lib, Inst Preservat Chinese Ancient Books, Shanghai 200433, Peoples R China

[3] Fudan Univ, Collaborat Innovat Ctr Chem Energy Mat, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China

关键词: Layered double hydroxide;    One-step synthesis;    Intercalation;    Ultrathin;    Adsorption;    Methyl orange;    Adsorption mechanism;   

DOI  :  10.1016/j.jcis.2020.05.050

来源: Elsevier

【 摘 要 】

A high-performance dye adsorbent of ultrathin dodecyl-sulfate (DS) intercalated Mg-Al layered double hydroxide nanosheets (DI-LDH Ns) were controllably synthesized by a simple one-step surfactant-assisted hydrothermal method. The unique intercalated structure with week interlayer interaction and high accessible surface of DI-LDH Ns provide efficient adsorption of methyl orange (MO), leading to its superior performance with much higher uptake capability (846.6 mg/g at 298 K) and less adsorbing equilibrium time (5 min) than those of ultrathin DS -surface-modified Mg-Al-LDH nanosheets (DM-LDH Ns, 327.4 mg/g at 298 K, 120 min) and original Mg-Al-LDH (O-LDH, 208.2 mg/g at 298 K, 120 min). The composition and structure of these LDHs were investigated by systematic physicochemical characterization, such as XRD, TEM, FT-IR, BET and TGA. The adsorption behavior of DI-LDH Ns follows the Langmuir isotherm equation. A plausible mechanism is proposed to explain the adsorption process of such DI-LDH Ns, in which the synergistic contributions of surface and interlayer adsorption between DI-LDH Ns and MO play an important role. This study puts forward a new thought for the development of high-performance LDH adsorbents with an ultrathin intercalated structure for the efficient and rapid removal of dyes. (C) 2020 Elsevier Inc. All rights reserved.

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