Super adsorption capability of rhombic dodecahedral Ca-Al layered double oxides for Congo red removal

被引：54

作者：

Zhang, Heng ^{[1
]}

Chen, Hang ^{[1
]}

Azat, Seytkhan ^{[2
,3
]}

Mansurov, Zulkhair A. ^{[2
,3
]}

Liu, Xueming ^{[1
]}

Wang, Jide ^{[1
]}

Su, Xintai ^{[1
]}

Wu, Ronglan ^{[1
]}

机构：

[1] Xinjiang Univ, Coll Chem & Chem Engn, Minist Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China

[2] Inst Combust Problems, Alma Ata 050012, Kazakhstan

[3] Al Farabi Kazakh Natl Univ, Alma Ata 050040, Kazakhstan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 768卷

基金：

中国国家自然科学基金;

关键词：

Ca-Al layered double oxides; Congo red; Rhombic dodecahedral structure; Adsorption; DOUBLE HYDROXIDES; AQUEOUS-SOLUTION; METHYL-ORANGE; WASTE-WATER; COAGULATION PROCESSES; ACTIVATED CARBON; GRAPHENE OXIDE; CR(VI); DYE; ADSORBENT;

D O I：

10.1016/j.jallcom.2018.07.241

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, a novel rhombic dodecahedral structure of Ca-Al-layered double hydroxides (Ca-Al-LDHs) was synthesized by a two-phase solvothermal method. Subsequently, Ca-Al layered double oxides (Ca-Al-LDOs) were obtained by calcinating Ca-Al-LDHs at 600 degrees C which maintained the rhombic dodecahedral structures well. The morphologies of as-obtained samples were characterized by both transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The phase structure and elemental composition were analyzed by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS), respectively. Fourier transformed infrared (FT-IR) spectra were performed to confirm the existence of LDH structures. The Ca-Al-LDOs exhibited high adsorption rates and superb adsorption capacities for removal of Congo red (CR) from aqueous solution. The maximum adsorption capacities of Ca-Al-LDOs towards CR reached to 1536.1 mg g(-1), which is extremely higher than most of hydrotalcite-like materials. The adsorption process of Ca-Al-LDHs and Ca-Al-LDOs were described by the Langmuir isotherm model and pseudo-second-order model well. The adsorption mechanisms mainly dominated by electrostatic adsorption, ion exchange process, hydrogen bonding interactions and surface complexation. This general strategy afforded a wide possibility to prepare a novel and advanced LDOs adsorption material for water treatment. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：572 / 581

页数：10

共 56 条

[1] Batch adsorption of 4-nitrophenol by acid activated jute stick char: Equilibrium, kinetic and thermodynamic studies [J].