The study of the removal conditions of free cyanide from wastewaters by layered double hydroxide through experimental design technique, kinetic and equilibrium studies

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ALAEI RASOOL; JAVANSHIR SEPIDEH; BEHNAMFARD ALI

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Journal: IRANIAN JOURNAL OF MINING ENGINEERING (IRJME) Year:2019 | Volume:14 | Issue:42 Page(s): 103-120

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Title

The study of the removal conditions of free cyanide from wastewaters by layered double hydroxide through experimental design technique, kinetic and equilibrium studies

Author(s)

ALAEI RASOOL | JAVANSHIR SEPIDEH | BEHNAMFARD ALI | Issue Writer Certificate

Keywords

Cyanide contaminated wastewaterQ1

Layered Double HydroxideQ1

AdsorptionQ1

Design of experimentsQ1

Kinetic and equilibrium ModelingQ1

Abstract

In mining and metallurgical activities, wastewater must be treated before discharging into the environment because of high cyanide toxicity. One of the most effective technologies for cyanide removal is Adsorption. In this research, Layered Double Hydroxides (LDHs) known as anionic clays was synthesized by co-precipitation process using a 3: 1 ratio of magnesium nitrate and aluminum nitrate and used for removal of cyanide from aqueous solutions. The chemical and mineralogical compositions of LDH were investigated using XRD, XRF, Scanning Electron Microscopy (SEM), and Wavelength Dispersive X-ray (WDX) analysis. Particle size of LDH was determined to be about 4 nm using Scherrer equation which indicates that the synthesized LDH is in the range of nano-sized materials. The effects of temperature, adsorbent dosage, stirring speed, and pH on the Adsorption capacity of LDH for cyanide were investigated using experimental design method (DX7 software). Maximum Adsorption capacity of synthesized LDH for cyanide was obtained about 73. 80 mg/g at stirring speed of 500 rpm, 60oC temperature, adsorbent weight of 1. 5 g, and pH=9. 52. The equilibrium and kinetic data were best fitted by Langmuir isotherm and pseudo-second order model, respectively. The Adsorption rate limiting step was determined to be intra-particle diffusion based on Weber and Morris model. It was found that the Adsorption of cyanide onto LDH was occurred through ion-exchange mechanism, due to the chemical composition and mineralogical structure of anionic clay. Moreover, LDH was synthesized using industrial grade salt, and the results showed that with an adsorbent dosage of 20 g/l, more than 84% of the cyanide can be removed from a real wastewater, and LDH has the potential for cyanide removal from aqueous solution.

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APA: Copy

ALAEI, RASOOL, JAVANSHIR, SEPIDEH, & BEHNAMFARD, ALI. (2019). The study of the removal conditions of free cyanide from wastewaters by layered double hydroxide through experimental design technique, kinetic and equilibrium studies. IRANIAN JOURNAL OF MINING ENGINEERING (IRJME), 14(42 ), 103-120. SID. https://sid.ir/paper/117073/en

Vancouver: Copy

ALAEI RASOOL, JAVANSHIR SEPIDEH, BEHNAMFARD ALI. The study of the removal conditions of free cyanide from wastewaters by layered double hydroxide through experimental design technique, kinetic and equilibrium studies. IRANIAN JOURNAL OF MINING ENGINEERING (IRJME)[Internet]. 2019;14(42 ):103-120. Available from: https://sid.ir/paper/117073/en

IEEE: Copy

RASOOL ALAEI, SEPIDEH JAVANSHIR, and ALI BEHNAMFARD, “The study of the removal conditions of free cyanide from wastewaters by layered double hydroxide through experimental design technique, kinetic and equilibrium studies,” IRANIAN JOURNAL OF MINING ENGINEERING (IRJME), vol. 14, no. 42 , pp. 103–120, 2019, [Online]. Available: https://sid.ir/paper/117073/en

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