Cr(VI) adsorption from aqueous solutions onto Mg-Zn-Al LDH and its corresponding oxide

被引：35

作者：

Eshaq, Gh. ^{[1
]}

Rabie, A. M. ^{[1
]}

Bakr, A. A. ^{[2
]}

Mady, A. H. ^{[1
]}

ElMetwally, A. E. ^{[1
]}

机构：

[1] Egyptian Petr Res Inst, Dept Petrochem, Cairo 11727, Egypt

[2] Egyptian Petr Res Inst, Dept Anal & Evaluat, Cairo 11727, Egypt

来源：

DESALINATION AND WATER TREATMENT | 2016年 / 57卷 / 43期

关键词：

Layered double hydroxide; Cr(VI); Adsorption; Wastewater treatment; LAYERED DOUBLE HYDROXIDES; WASTE-WATER; REMOVAL; HYDROTALCITE; CHROMIUM; CHITOSAN; SORPTION; ZINC; ION; POLYPYRROLE;

D O I：

10.1080/19443994.2015.1110840

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Mg-Zn-Al LDH and its corresponding oxide were successfully employed for Cr(VI) removal from aqueous solutions. Maximum adsorption capacity of 29.25 and 33.82mgg(-1) for Mg-Zn-Al LDH and calcined Mg-Zn-Al LDH, respectively, was achieved using Cr(VI) initial concentration of 70mgL(-1), 0.2gL(-1) of adsorbent, stirring rate of 160rpm, pH 6, a contact time of 105min, and a reaction temperature of 298K. The results show that the adsorption of Cr(VI) through the rehydration of calcined Mg-Zn-Al LDH is considerably higher than that through the anion exchange of Mg-Zn-Al LDH. Cr(VI) removal from aqueous solutions takes place via either anion exchange between interlayer anions of LDHs and Cr(VI) oxyanions or surface complexation between Cr(VI) oxyanions and inner and outer hydroxyl groups of LDH surfaces.

引用

页码：20377 / 20387

页数：11

共 56 条

[1] The adsorption of Cu(II) ions on bentonite - a kinetic study [J].

Al-Qunaibit, MH ;

Mekhemer, WK ;

Zaghloul, AA .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2005, 283 (02) :316-321

[2] Photocatalytically enhanced Cr(VI) removal by mixed oxides derived from MeAl (Me:Mg and/or Zn) layered double hydroxides [J].

Alanis, Claudia ;

Natividad, Reyna ;

Barrera-Diaz, Carlos ;

Martinez-Miranda, Veronica ;

Prince, Julia ;

Valente, Jaime S. .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2013, 140 :546-551

[3] Purification of chromium(VI) finishing wastewaters using calcined and uncalcined Mg-Al-CO3-hydrotalcite [J].

Alvarez-Ayuso, E ;

Nugteren, HW .

WATER RESEARCH, 2005, 39 (12) :2535-2542

[4] Application of polypyrrole coated on wood sawdust for removal of Cr(VI) ion from aqueous solutions [J].

Ansari, R. ;

Fahim, N. Khoshbakht .

REACTIVE & FUNCTIONAL POLYMERS, 2007, 67 (04) :367-374

[5] Copper ions removal from aqueous solutions by novel Ca-Al-Zn layered double hydroxides [J].

Bakr, A. A. ;

Eshaq, Gh. ;

Rabie, A. M. ;

Mady, A. H. ;

ElMetwally, A. E. .

DESALINATION AND WATER TREATMENT, 2016, 57 (27) :12632-12643

[6] Kinetics of uptake of Fe(II) from aqueous solutions by Co/Mo layered double hydroxide (Part 2) [J].

Bakr, A. A. ;

Mostafa, M. S. ;

Eshaq, Gh. ;

Kamel, M. M. .

DESALINATION AND WATER TREATMENT, 2015, 56 (01) :248-255

[7]

Baral Anil., 2002, ENVIRON SCI POLICY, V5, P121, DOI [DOI 10.1016/S1462-9011(02)00028-X, 10.1016/S1462-9011(02)00028-X]

[8] THE DETERMINATION OF PORE VOLUME AND AREA DISTRIBUTIONS IN POROUS SUBSTANCES .1. COMPUTATIONS FROM NITROGEN ISOTHERMS [J].

BARRETT, EP ;

JOYNER, LG ;

HALENDA, PP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1951, 73 (01) :373-380

[9] Revised Pourbaix diagrams for chromium at 25-300 degrees C [J].

Beverskog, B ;

Puigdomenech, I .

CORROSION SCIENCE, 1997, 39 (01) :43-57

[10] Enhanced removal of Cr(VI) from aqueous solution using polypyrrole/Fe3O4 magnetic nanocomposite [J].

Bhaumik, Madhumita ;

Maity, Arjun ;

Srinivasu, V. V. ;

Onyango, Maurice S. .

JOURNAL OF HAZARDOUS MATERIALS, 2011, 190 (1-3) :381-390

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