Polypyrrole–polyaniline copolymer coated green rice husk ash as an effective adsorbent for the removal of hexavalent chromium from contaminated water

Abstract

The acute toxicity and mobility of hexavalent chromium (Cr(VI)) in water and wastewater possess a severe risk to the environment and human health. In view of this, the present work...

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

“…The regeneration and reusability of an adsorbent is necessary to evaluate its feasibilty and cost-effective for application in the large scale treatment of industrial wastewater (Kera et al 2018). Most studies reviewed conducted regeneration studies of the spent adsorbents including (Chigondo et al 2019) Dutta et al 2021;Janmohammadi et al 2021). Nevertheless, such a more comprehensive study of the adsorbent regeneration is still limited in most literature.…”

“…arginine doped polypyrrole (Fe 3 O 4 @PPyArg);(Dutta et al 2021) polypyrrole-polyaniline coated rice husk ash (PPyANI@RHA);(Janmohammadi et al 2021) Waste plastic filter modified with polyaniline and polypyrrole (PPF@PANI þ PPy);(Karthikeyan et al 2021) (magnesium ferrite-reinforced polypyrrole hybrids) (Ppy@x%MgFe 2 O 4 ),(Kera et al. 2018) (m-Phenylenediamine-modified polypyrrole) (PPy-mPD); (Mdlalose et al 2020), polypyrrole and montmorillonite clay (PPy-MMT), (Sun et al 2020a, 2020b) (Fe 3 O 4 and attapulgite-doped polypyrrole) (PPy/ Fe 3 O 4 /ATP) and (Xiang et al 2021) (polypyrrole coated molybdenum disulfide) (PPy/MoS 2 ).…”

Hollow Polyaniline Microsphere/MnO2/Fe3O4 Nanocomposites in Adsorptive Removal of Toxic Dyes from Contaminated Water

“…MnO 2 and Fe 3 O 4 showed typical characterization peaks at around 780 and 760 cm –1 , corresponding to the Mn–O stretching and Fe–O bond vibrations, respectively. Interestingly, PNHM displayed several peaks at 812, 1179, 1235, 1345, 1560, and 1597 cm –1 due to the deformation of imine, in-plane C–H bending, in-plane deformation of ring, stretching of C–N + , C–C stretching vibrations, and CN bonds of polyaniline chain, respectively. , The findings of this analysis confirmed that all signature peaks corresponding to PANI, MnO 2 , and Fe 3 O 4 remain intact in pristine and dye-laden PNHM/MnO 2 /Fe 3 O 4 composites.…”

“…Considering the factors mentioned above, the present work is focused on the adsorptive removal of cationic methyl green (MG) and anionic Congo red (CR), owing to their excessive use in industrial and biological sectors as well as their ecotoxicological effects. − Further, the performance of the adsorbent is determined based on the desired characteristics of an efficient adsorbent, including simple synthesis routes, nontoxicity, high adsorption capacity, and recycling ability . Therefore, various adsorbents such as activated carbon, carbon nanotubes, graphene oxides, natural clay materials, layered double hydroxides, metal-organic frameworks, metal oxides, conducting polymers, and their hybrids have been used as adsorbents for the removal of dyes from aqueous media. , Among these, conducting polymer-based adsorbents are of prime interest owing to their diverse physicochemical properties, low cost, and wide applications in various fields, including environmental remediation, electromagnetic shielding instruments, extraction, and electrochemical applications. ,, …”

Highly efficient removal of hexavalent chromium using hexagonal disc shaped barium hydrogen phosphate

“…Adsorption has advantages over other methods because of its simplicity, high efficiency, recyclability, and availability of a large number of adsorbents and can be applied to the removal of different type toxic pollutants 9–12 . A number of adsorbents such as fertilizers waste, 8 activated carbon, 13 graphene, 14 conducting polymers, 15–17 chitosan, 18,19 cellulose, 20,21 iron oxides, 22 metal–organic framework, 23 biochar, 24 coconut shell, 25 silica, 26 and many more were being synthesized and used for the aqueous Cr (VI) adsorption 27 …”