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Dinh VP, Nguyen PT, Tran MC, Luu AT, Hung NQ, Luu TT, Kiet HAT, Mai XT, Luong TB, Nguyen TL, Ho HTT, Nguyen DK, Pham DK, Hoang AQ, Le VT, Nguyen TC. HTDMA-modified bentonite clay for effective removal of Pb(II) from aqueous solution. CHEMOSPHERE 2022; 286:131766. [PMID: 34416581 DOI: 10.1016/j.chemosphere.2021.131766] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 07/19/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
This work studies the Pb(II) removal onto bentonite clay modified by hexadecyl trimethyl ammonium bromide (HDTMA). Characterizations of the unmodified and modified materials were performed by using XRD, SEM, TG-DSC, FT-IR, and BET surface area analyses. Factors influencing the uptake of Pb(II) from aqueous solution, such as pHsolution, ion strength, uptake time, adsorbent dosage, and initial Pb(II) concentration, were examined. The obtained results showed that bentonite clay was successfully modified by HDTMA, resulting in an increase in its surface area by about 70 %. The Pb(II) adsorption onto modified bentonite clay reached equilibrium at pH = 5.0 after 120 min. Studies within the isotherm and kinetic models demonstrated that the adsorption followed the Sips isotherm and pseudo-second-order kinetic models. The maximum monolayer adsorption capacity calculated from the Langmuir model at 30 °C was 25.8 mg/g, which is much higher than that obtained for the unmodified sample (18.9 mg/g). The FT-IR and TG-DSC analyses indicated that the formation of inner-sphere complexes plays a fundamental role in the mechanism of Pb(II) uptake onto HDTMA-bentonite clay. This mechanism of Pb(II) adsorption was further investigated, for the first time, by using the positron annihilation lifetime (PAL) and electron momentum (EMD) measurements. The PAL and EMD analyses indicated that the existence of Al and Si mono-vacancies in the HDTMA-bentonite should have essential contributions to the adsorption mechanism. In particular, we found a very interesting mechanism that the Pb(II) adsorption should occur inside the interlayer spaces of the HDTMA-bentonite.
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Affiliation(s)
- Van-Phuc Dinh
- Future Materials & Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang City, 550000, Viet Nam.
| | - Phuong-Tung Nguyen
- Center for Interdisciplinary Research in Technology (CIRTech) - HUTECH University of Technology, 475A Dien Bien Phu, Binh Thanh Dist., Ho Chi Minh City, 700000, Viet Nam; Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 1A TL 29, Dist. 12, Ho Chi Minh City, 700000, Viet Nam.
| | - Minh-Chien Tran
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 1A TL 29, Dist. 12, Ho Chi Minh City, 700000, Viet Nam
| | - Anh-Tuyen Luu
- Center for Nuclear Technologies, 217 Nguyen Trai, Dist. 1, Ho Chi Minh City, 700000, Viet Nam; Joint Institute for Nuclear Research, 6 Joliot Curie, Dubna, 141980, Russia
| | - N Quang Hung
- Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang City, 550000, Viet Nam
| | - Thi-Thuy Luu
- Future Materials & Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang City, 550000, Viet Nam
| | - H A Tuan Kiet
- Institute of Research and Development, Duy Tan University, Da Nang City, 550000, Viet Nam; Graduate School of Education, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Xuan-Truong Mai
- Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang City, 550000, Viet Nam
| | - Thi-Bich Luong
- Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 1A TL 29, Dist. 12, Ho Chi Minh City, 700000, Viet Nam
| | - Thi-Lieu Nguyen
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 1A TL 29, Dist. 12, Ho Chi Minh City, 700000, Viet Nam; Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao, Go Vap Dist., Ho Chi Minh City, 700000, Viet Nam
| | - Hien T T Ho
- Faculty of Technology, Van Lang University, 45 Nguyen Khac Nhu, Dist. 1, Ho Chi Minh City, 700000, Viet Nam
| | - Duy-Khoi Nguyen
- Future Materials & Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang City, 550000, Viet Nam
| | - Duy-Khanh Pham
- Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 1A TL 29, Dist. 12, Ho Chi Minh City, 700000, Viet Nam
| | - Anh-Quan Hoang
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 1A TL 29, Dist. 12, Ho Chi Minh City, 700000, Viet Nam
| | - Van-Toan Le
- Nuclear Research Institute, Vietnam Atomic Energy Institute, 1 Nguyen Tu Luc, Da Lat City, 670000, Lam Dong province, Viet Nam
| | - Thi-Chuong Nguyen
- Le Quy Don High School for the Gifted Students, Vung Tau City, 780000, Viet Nam
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