Bentonite-assisted construction of magnesium-silicate-based composite as efficient adsorbent for organic dye removal

Abstract

Fabricating highly efficient and low-cost absorbents to remove organic contaminants in industrial effluents is urgent yet of great importance. Herein, a facile one-pot hydrothermal approach was developed to successfully construct magnesium silicate and bentonite composite (MS-Bt) with uniform multilayer porous structure by using Bt as structural promoter. The specific surface area of MS-Bt can reach up to 392 m²·g⁻¹ along with an average pore diameter of 2.29 nm and a pore volume of 0.22 cm³·g⁻¹. MS-Bt composite exhibits a maximal adsorption capacity of 253.92 mg·g⁻¹ for methylene blue (MB) in model wastewater treatment. Adsorption behavior fitted well with Langmuir isotherm and pseudo-second-order kinetics adsorption equations. The adsorption pathways of MB on MS-Bt mainly include chemical precipitation by Mg-OH, electrostatic attraction and surface hydroxyl functional group capture. This work is anticipated to give a new insight into constructing organic contaminants adsorbent by using clay mineral material as an auxiliary agent.

Keywords:

• Magnesium silicate
• bentonite
• composite
• adsorption
• methylene blue

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available from the corresponding author.

Additional information

Funding

This work was supported by the open project from Engineering Laboratory of Chemical Resources Utilization in South Xinjiang of Xinjiang Production and Construction Corps [CRUYB2301], the President’s Fund of Tarim University [TDZKSS202128], the Central Government Guiding Funds for Local Science and Technology Development [Z135050009017, 2022ZY015].

Notes on contributors

Zhong Li

Zhong Li is a lecturer at the College of Chemistry and Chemical Engineering, Tarim University. The research field is Industrial adsorbents, industrial catalysts.

Feipeng Cheng

Feipeng Cheng is a master candidate at the College of Chemical Engineering, Beijing University of Chemical Technology. His research directions are the Clay mineral materials.

Yajun Li

Yajun Li is a master candidate at the College of Chemical Engineering, Beijing University of Chemical Technology. His research directions are the Clay mineral materials.

Dengfeng Wu

Dengfeng Wu is a lecturer at the College of Chemical Engineering, Beijing University of Chemical Technology. The research field is the Clay mineral materials.

Dongliang Yang

Dongliang Yang is a master candidate at the College of Chemical Engineering, Beijing University of Chemical Technology. His research directions are the Clay mineral materials.

Dan Sun

Dan Sun is a lecturer at the College of Chemistry and Chemical Engineering, Tarim University. The research field is molecular sieves and their applications.

Daojian Cheng

Daojian Cheng is a Chaired Professor Tarim University. He is interested in the design, preparation and application of metal nano catalysts in the chemical industry.

Weiliang Tian

Weiliang Tian is a Professor at the College of Chemistry and Chemical Engineering, Tarim University. The research field is nanocomposite materials.