Biogenic Synthesis of Carboxymethyl Cashew Gum Modified Gold Nanoparticles and its Sensitive and Selective Calorimetric Detection of Hg2+ Ions and Catalytic Reduction of Methyl Red

Ruqya Banu; Bhagavanthreddy Gangapuram; Dasari Ayodhya; Ramakrishna Dadigala; Guttena Veerabhadram; Girija Mangatayaru Kotu

doi:10.1007/s10895-022-03073-3

Biogenic Synthesis of Carboxymethyl Cashew Gum Modified Gold Nanoparticles and its Sensitive and Selective Calorimetric Detection of Hg²⁺ Ions and Catalytic Reduction of Methyl Red

J Fluoresc. 2023 Jan;33(1):209-221. doi: 10.1007/s10895-022-03073-3. Epub 2022 Nov 18.

Authors

Ruqya Banu¹, Bhagavanthreddy Gangapuram¹, Dasari Ayodhya², Ramakrishna Dadigala², Guttena Veerabhadram², Girija Mangatayaru Kotu³

Affiliations

¹ Department of Chemistry, Palamuru University, Mahaboob Nagar, Telangana, 509001, India.
² Department of Chemistry, University College of Science, Osmania University, Hyderabad, Telangana, 500007, India.
³ Department of Chemistry, Palamuru University, Mahaboob Nagar, Telangana, 509001, India. kgirijamangatayaru@gmail.com.

PMID: 36399249
DOI: 10.1007/s10895-022-03073-3

Abstract

In the present study, we have successfully synthesized and characterized carboxy methyl cashew gum modified gold nanoparticles (CMCG-AuNPs) via a microwave-assisted method and used as a calorimetric probe for selective detection of Hg²⁺ ions as well as catalytic reduction of methyl red in an aqueous medium. The effect of different parameters including concentration and irradiation time on the formation of CMCG-AuNPs was also investigated. The presence of strong surface plasmon resonance (SPR) peak in the visible region indicated the formation of AuNPs. The characterization techniques were identified the interaction between the CMCG and AuNPs with estimation of size and morphology. The face centred cubic (FCC) crystal structure was identified by using XRD and supporting with SAED pattern. TEM images of CMCG-AuNPs were exhibited as polydispersed with spherical in shape and the average particle size was 12 ± 3 nm. The synthesized CMCG-AuNPs were utilized to sensing Hg²⁺ ions in an aqueous medium, the presence of Hg²⁺ ions selectively among other metal ions, the CMCG-AuNPs were aggregated by changing the color from wine red to purple blue accompanied by change in the position of SPR peak and intensity. It was observed as a strong linear relationship based on the change in intensity, the limit of detection was determined to be 0.277 nM. The catalytic activity was also examined for the reduction of methyl red (MR) in the presence of CMCG-AuNPs was completed within 12 min and followed pseudo-first order kinetics with a rate constant of 0.261 min^-1. From the obtained results, the synthesized CMCG-AuNPs were useful for detection of heavy metal ions as well as toxic pollutants degradation via a green method, and utilized sensing, environmental, and biomedical application in future.

Keywords: Carboxy methyl cashew gum; Dye reduction; Gold nanoparticles; Hg2+ Detection; Microwave synthesis.