Lactose intercalated layered double hydroxide as a green sorbent for efficient and selective removal of heavy metals from aqueous solution

Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

IRANCC20_306

تاریخ نمایه سازی: 28 اردیبهشت 1398

Abstract:

In recent years, layered double hydroxides (LDHs) have shown a remarkable potential for effective removal of heavy metals owing to their large surface area, high anion exchange capacity and good thermal stability [1]. This study represents the efficient removal of heavy metals from aqueous solution by layered double hydroxide intercalated with biomolecule as a green and economical sorbent. The Lactose (LA) was intercalated into copper-aluminium layered double hydroxide (CuAl-LA-LDH) to produce an adsorbent which indicates highly selective and extremely efficient removal of heavy metal such as Hg+2 and Pb+2. LA-LDH was prepared using the co-precipitation method. The structure of sorbent was investigated using X-ray diffraction, scanning electron microscopy, Fourier transform infrared, Brunauer-Emmett-Teller, Barret-Joyner-Halenderm and transmission electron microscopy. X-Ray diffraction showed that with the presence of lactose, distance between the layers has increased compared with the NO3-LDH. To extract the analytes, 20 mg of sorbent was added into 20 mL of the solution containing a certain concentrations of heavy metals. The mixture was stirred for 1 h at a constant temperature of 25 °C. After extraction of the ions at equilibrium time, the sorbent was setteled by centrifugation. The metal ions concentrations in the supernatant solutions were determined using ICP-AES. Sorption isotherm for Hg+2 and Pb+2 agrees with the Langmuir model suggesting a monolayer adsorption and maximum adsorption capacity was 303.0 mg g-1 for Hg+2 and 322.6 mg g-1 for Pb+2. The sorption kinetics for mentioned ions follows a pseudu-second-order model, suggesting a chemisorption process. The distribution coefficient (Kd) values using CuAl-LA-LDH was 6.07×104 ml g-1 for Hg+2 and 6.41×102 ml g-1 for Pb+2. The results were shown that the sorbent has high capability to remove heavy metals from aqueous solutions.

Authors

Ghazal Javadian,

Department of Chemistry, Tarbiat Modares University, Tehran, Iran

Yadollah Yamini

Department of Chemistry, Tarbiat Modares University, Tehran, Iran

Hamid Asiabi,

Department of Chemistry, Tarbiat Modares University, Tehran, Iran

Maryam Shamsayei

Department of Chemistry, Tarbiat Modares University, Tehran, Iran