Synthesis of single‐walled carbon nanotubes cerium(IV) phosphate composite cation exchnager: Ion exchange studies and its application as ion‐selective membrane electrode for determination of Cd(II) ions

Abstract

Single‐walled carbon nanotubes cerium(IV) phosphate composite cation exchanger was synthesized using sol−gel method. The ion‐exchange properties such as elution concentration, elution behavior and effect of temperature on ion exchange capacity were studied. The composite cation exchange material showed an ion‐exchange capacity (IEC) of 1.64 meq dry g−1 of ion exchanger. The distribution studies revealed that the composite cation‐exchanger is highly selective for Cd(II) ions. The material was used as an electroactive component for the construction of a cadmium ion‐selective membrane electrode. The membrane electrode showed a Nernstian response for Cd(II) ions over a wide concentration range of 1 × 10−7−1 × 10−1 M with a sub‐Nernstian slope of 27.429 mV per decade change in concentration of cadmium ions. The limit of detection was found to be 1 × 10−7 M. It possessed a fast response time 10 s and can be utilized for 130 days without any considerable divergence in response potential. The practical utility of membrane electrode was demonstrated by employing as an indicator electrode for the potentiometric titration of Cd(II) with ethylenediamine tetra acetic acid, disodium salt (EDTA). POLYM. COMPOS., 38:1005–1013, 2017. © 2015 Society of Plastics Engineers

Insights Into the Mn(VII) and Cr(VI) Adsorption Mechanisms on Purified Diatomite/MCM-41 Composite: Experimental Study and Statistical Physics Analysis

“…During the last few decades, a significant amount of industrial effluents and solid has been discharged into the environment, especially the aquatic systems, due to industrialization and anthropogenic activities. Pollution of water resources via these effluents that contain toxic organic and inorganic compounds has generated technological challenges in terms of water treatment to reduce and minimize the associated environmental impacts and the potential harmful effects to human as well as aquatic organisms ( Inamuddin and Ismail, 2010 ; Kabiri et al, 2014 ; Ahamed et al, 2016 ; Mohammad et al, 2016 ; Inamuddin et al, 2017 ; Fegade et al, 2020 ). In particular, the continuous discharge of industrial effluents that contain several heavy metal ions into water resources is a significant threat to the aquatic environment ( Hua et al, 2012 ; Inamuddin et al, 2017 ).…”

“…Pollution of water resources via these effluents that contain toxic organic and inorganic compounds has generated technological challenges in terms of water treatment to reduce and minimize the associated environmental impacts and the potential harmful effects to human as well as aquatic organisms ( Inamuddin and Ismail, 2010 ; Kabiri et al, 2014 ; Ahamed et al, 2016 ; Mohammad et al, 2016 ; Inamuddin et al, 2017 ; Fegade et al, 2020 ). In particular, the continuous discharge of industrial effluents that contain several heavy metal ions into water resources is a significant threat to the aquatic environment ( Hua et al, 2012 ; Inamuddin et al, 2017 ). Chronic exposure to low concentrations of stable metal ions (e.g., manganese and chromium) is dangerous for human beings ( Liu et al, 2019 ).…”