A green nanocomposite based modified cellulose/TiO2/Cinnamon bark for the reduction of toxic organic compounds using spectrophotometric technique

The current study, reported the fabrication of bio-nanocomposite catalyst based on sulfated carboxymethyl cellulose (S-CMC) and TiO2 nanoparticles composited with cinnamon bark (CIN) (CIN/S-CMC/TiO2). The prepared CIN/S-CMC/TiO2 bio-nanocomposite was produced as supporting material for the preparation of highly active zero valent metal nanoparticles (MNPs) The CIN/S-CMC/TiO2 loaded with mono Co, Cu and bimetallic Cu-Co metal ions were then reacted with aqueous solution of sodium borohydride in order to reduce the metal ions into their respective zero-valent MNPs (M-0). The CIN/S-CMC/TiO2 bio-nanocomposite loaded with mono and bimetallic M-0 were analyzed by FTIR, XRD, EDX and FE-SEM, which confirms the successful fabrication of M-0 on the surface of CIN/S-CMC/TiO2 bio-nanocomposite. The M-0/CIN/S-CMC/TiO2 bio-nanocomposites were utilized as an effective catalyst for the successful reduction of 4-nitrophenol (4NP) and azo dyes such as Congo Red (CR), Methyl Orange (MO) And Acid Red (AR). Among all the fabricated catalysts, Co-Cu/CIN/S-CMC/TiO2 displayed better catalytic activity for the reduction of 4-NP and toxic azo dyes in the existence of sodium borohydride, with apparent constants of 0.99 min(-1), 0.747 min(-1), 0.621 min(-1) and 0.342 min(-1) respectively. Despite of having enhanced catalytic capability, the proposed bio-nanocomposite catalyst could be easily recoverable from the reaction solution after complete reduction process and can be used several times for the reduction of new samples. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

The study presented a bio-nanocomposite catalyst based on S-CMC and TiO2 nanoparticles composited with CIN for the reduction of metal ions and toxic azo dyes. Among the catalysts tested, Co-Cu/CIN/S-CMC/TiO2 exhibited superior catalytic activity.