Roozbeh Soltani1, Rasool Pelalak2,3, Mahboubeh Pishnamazi2,4, Azam Marjani5,6, Ahmad B Albadarin7, Shaheen M Sarkar7, Saeed Shirazian2,3,8. 1. Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran. 2. Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam. 3. Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, 550000, Vietnam. 4. Faculty of Pharmacy, Duy Tan University, Da Nang, 550000, Vietnam. 5. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam. azam.marjani@tdtu.edu.vn. 6. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam. azam.marjani@tdtu.edu.vn. 7. Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick, Ireland. 8. Laboratory of Computational Modeling of Drugs, South Ural State University, 76 Lenin prospekt, Chelyabinsk, 454080, Russia.
Abstract
To date, many nanoadsorbents have been developed and used to eliminate heavy metal contamination, however, one of the challenges ahead is the preparation of adsorbents from processes in which toxic organic solvents are used in the least possible amount. Herein, we have developed a new carboxylic acid-functionalized layered double hydroxide/metal-organic framework nanocomposite (LDH/MOF NC) using a simple, effective, and green in situ method. UiO-66-(Zr)-(COOH)2 MOF nanocrystals were grown uniformly over the whole surface of COOH-functionalized Ni50Co50-LDH ultrathin nanosheets in a green water system under a normal solvothermal condition at 100 °C. The synthesized LDH/MOF NC was used as a potential adsorbent for removal of toxic Cd(II) and Pb(II) from water and the influence of important factors on the adsorption process was monitored. Various non-linear isotherm and kinetic models were used to find plausible mechanisms involved in the adsorption, and it was found that the Langmuir and pseudo-first-order models show the best agreement with isotherm and kinetic data, respectively. The calculated maximum adsorption capacities of Cd(II) and Pb(II) by the LDH/MOF NC were found to be 415.3 and 301.4 mg g-1, respectively, based on the Langmuir model (pH = 5.0, adsorbent dose = 0.02 g, solution volume = 20 mL, contact time = 120 min, temperature = 25 ℃, shaking speed 200 rpm).
To date, many nanoadsorbents have been developed and used to eliminate n class="Chemical">heavy metalcontamination, however, one of the challenges ahead is the preparation of adsorbents from processes in which toxic organic solvents are used in the least possible amount. Herein, we have developed a new carboxylic acid-functionalized layered double hydroxide/metal-organic framework nanocomposite (LDH/MOF NC) using a simple, effective, and green in situ method. UiO-66-(Zr)-(COOH)2MOF nanocrystals were grown uniformly over the whole surface of COOH-functionalized Ni50Co50-LDH ultrathin nanosheets in a green water system under a normal solvothermal condition at 100 °C. The synthesized LDH/MOF NC was used as a potential adsorbent for removal of toxic Cd(II) and Pb(II) from water and the influence of important factors on the adsorption process was monitored. Various non-linear isotherm and kinetic models were used to find plausible mechanisms involved in the adsorption, and it was found that the Langmuir and pseudo-first-order models show the best agreement with isotherm and kinetic data, respectively. The calculated maximum adsorption capacities of Cd(II) and Pb(II) by the LDH/MOF NC were found to be 415.3 and 301.4 mg g-1, respectively, based on the Langmuir model (pH = 5.0, adsorbent dose = 0.02 g, solution volume = 20 mL, contact time = 120 min, temperature = 25 ℃, shaking speed 200 rpm).
Authors: Maryam Heydari; Mohammad T Jafari; Mohammad Saraji; Roozbeh Soltani; Mohammad Dinari Journal: Mikrochim Acta Date: 2021-01-02 Impact factor: 5.833
Authors: Fatemah H Alkallas; Hoda A Ahmed; Tahani A Alrebdi; Rami Adel Pashameah; Salhah H Alrefaee; Emaan Alsubhe; Amira Ben Gouider Trabelsi; Ayman M Mostafa; Eman A Mwafy Journal: Membranes (Basel) Date: 2022-06-27