A systematic study of arsenic adsorption and removal from aqueous environments using novel graphene oxide functionalized UiO-66-NDC nanocomposites

Simranjeet Singh; T S Sunil Kumar Naik; Basavaraju U; Nadeem A Khan; Abdul Basit Wani; Sushant Kumar Behera; Bidisha Nath; Shipra Bhati; Joginder Singh; Praveen C Ramamurthy

doi:10.1038/s41598-022-18959-2

A systematic study of arsenic adsorption and removal from aqueous environments using novel graphene oxide functionalized UiO-66-NDC nanocomposites

Sci Rep. 2022 Sep 22;12(1):15802. doi: 10.1038/s41598-022-18959-2.

Authors

Affiliations

¹ Interdisciplinary Centre for Water Research (ICWaR), Indian Institute of Science, Bangalore, India.
² Department of Materials Engineering, Indian Institute of Science, Bangalore, India.
³ Civil Engineering Department, Mewat Engineering College, Nuh, Haryana, India.
⁴ Department of Chemistry, University of Kashmir, Srinagar, India.
⁵ Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore, India.
⁶ Department of Chemistry, The Oxford College of Engineering, Bangalore, India.
⁷ Department of Microbiology, Lovely Professional University, Phagwara, Punjab, India.
⁸ Interdisciplinary Centre for Water Research (ICWaR), Indian Institute of Science, Bangalore, India. [email protected].

^# Contributed equally.

Abstract

This study investigates the removal of As(V) from aqueous media using water stable UiO-66-NDC/GO prepared via the solvothermal procedure. The synthesized material was analyzed by Raman spectroscopy, UV-visible, X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), Fourier Transform Infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) support its applicability as a super-adsorbent for the adsorption of As(V) ions from aqueous solutions. The effect of various parameters, including initial ion concentration, temperature, adsorbent dose, and pH on the adsorption of As(V) was studied to recognize the optimum adsorption conditions. The q_max obtained for this study using Langmuir isotherms was found at 147.06 mg/g at room temperature. Thermodynamic parameters ΔH°, ΔG°, and ΔS° were also calculated and negative values of ΔG° represent that the As(V) adsorption process occurred exothermically and spontaneously. Meanwhile, theoretical density functional simulation findings are accommodated to support these experimental results. It is observed that the dynamic nature of graphene oxide and the UiO-66 NDC nanocomposite system becomes superior for adsorption studies due to delocalized surface states. UiO-66-NDC/GO also showed high reusability for up four regeneration performances using 0.01 M HCl as a regenerant.