High-Performance Hg(II) Removal Using Thiol-Functionalized Polypyrrole (PPy/MAA) Composite and Effective Catalytic Activity of Hg(II)-Adsorbed Waste Material

Abstract

Problems related with highly toxic mercury emissions from industrial effluents are one of the great concerns in the world of environmental science and technology. The primary aim of this present work is the remediation of hazardous pollutant Hg (II) from aqueous medium via a thiol-functionalized (mercaptoacetic acid) conducting polypyrrole (PPy/MAA) composite. The synthesized composite exhibited high Hg­(II) adsorption capacity as the incorporated mercapto functionality plays a vital role for the strong binding affinity toward Hg­(II) ions. To understand the adsorption properties of the developed polymer composite, a series of batch adsorption experiments were performed by altering the adsorption parameters. A maximum adsorption capacity (q max) of 1736.8 mg/g at 25 °C was obtained using the Langmuir isotherm. The adsorption data showed better fitting to the pseudo-second-order rate equation for Hg­(II) adsorption. A plausible adsorption mechanism is suggested on the basis of XPS results of major elements present in the adsorbent. To apply to catalytic reactions, the use of waste-derived mercury-adsorbed material (termed as PPy-MAA/Hg (II)) is also addressed here for further application of organic transformation. Here, we described the catalytic reaction with phenylacetylene in the presence of 5 mol % PPy-MAA/Hg (II) catalyst at 90 °C for 6 h. This method provides a straightforward formation of acetophenone in 55% yield. Thus, PPy/MAA not only effectively eliminates toxic Hg­(II) ions from water but also is successfully applied for the catalytic organic transformation after adsorption.

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

“…The spectrum of the PPy showed the typical absorbance peaks at 1548 and 1456 cm À1 corresponding to the symmetric and antisymmetric stretching modes of the PPy ring, respectively. 9,23 The peak at 1170 cm À1 is assigned to C-C stretching. The band at 1042 and 907 cm À1 is due to in-plane deformation of C-H bond of pyrrole ring.…”

A Green Route Strategy for the Synthesis of Multifunctional Polymer Nanocomposites for Environmental Sustainability

“…In this study, the hybrid TE‐f‐NC materials were used as photocatyst for the decomposition of methyl blue (MB) dye in water. Herein, the surface modification of an adsorbent with thiol functional groups has shown high binding affinity towards dye removal ,. The present study focuses on the development of adsorbents modified with Sulphur‐based ligands such as thiol groups.…”

Review on the Use of Heavy Metal Deposits from Water Treatment Waste towards Catalytic Chemical Syntheses

“…However, the diversity of heavy metals contaminates wastewater, and its complexity in the existing structure leads to the treatment of wastewater being a highly challenging task. Recently, various emerging methods of wastewater treatment have been considered given the above-mentioned facts, which can recognize both the easy recovery of heavy metals, and those used for different purposes of catalytic applications [36][37][38][39]. The progress of this type of research would shed new light on the treatment of industrial wastewater polluting heavy metals.…”