Use of PMMA/(rice husk ash)/polypyrrole membranes for the removal of dyes and heavy metal ions

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

“…61,72 The characteristic peaks of pyrrole in the spectra of PPY-PANI@RHA appeared at 1552, 1490, 1300, 1110, 1048, 925 to 800 cm -1 , corresponding to the angular deformation of the N-H group of primary amines present in polypyrrole, conjugated C-N stretching, C-N stretching vibration, C-H stretching vibration, N-H in-plane deformation, and C-H deformation, respectively. 44,57,73 Further, the presence of the peaks at 1590 cm -1 (C=N stretching), 1552 cm -1 (C-N stretching), 1300 cm -1 (N-H deformation), 74 along with 1490 cm -1…”

“…56 In this regard, interest has been devoted on the fabrication of various PPY, and PANI coated on low-cost, ecofriendly promising bio-adsorbents, such as sawdust, sugarcane bagasse, rice husks, rice husk ash, chitin, coconut coir as an adsorbent for the removal of heavy metal from wastewater. 41,44,[57][58][59] Among these, owing to its production in Asia in enormous quantities, sustainable, and low-cost rice husk has been receiving considerable attention as an effective adsorbent for the removal of various pollutants from water and wastewaters. 60 The studies have also been made on utilizing rice husk in preparation of rice husk ash (RHA) comprising SiO 2 (~94.50%), CaO (~1.80%), Al 2 O 3 (~0.29%), and other minor mineral elements composition and use as an adsorbent in the removal of pollutants present in contaminated water.…”

Rheological, thermal and morphological properties of polyethylene terephthalate/polyamide 6/rice husk ash composites

“…The RHA micrograph shows that the burning of the rice husk caused the destruction of the cell structure in the form of cob in the raw rice husk. Figure 12(b) shows the existence of rough spherical particles of irregular spherical shape, corresponding to silica agglomerates that condense after formation of silicon vapor during carbonization 28 …”

“…More recently, Wang et al 27 showed that poly (3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) and RHA derived‐nano‐SiO 2 composites have greater tensile and flexural strength, as well as better thermal stability than neat PHBV. Rocha et al 28 prepared composites membranes of Polymethylmethacrylate/RHA/Polypyrrole with an excellent capacity for removal of organic dyes (tartrazine and indigo carmine) and hexavalent chromium ions. The study also showed that addition of 10%RHA as a filler in the polymeric matrix of PMMA confers greater mechanical resistance to the composite membranes.…”

Advanced Nanocellular Foams: Perspectives on the Current Knowledge and Challenges

“…Additionally, new applications should be considered and tested for these materials. For instance, PMMA-based materials have shown the capability of treating polluted water [ 41 , 42 , 43 ], an application which could benefit from the very high surface area of nanocellular open-cell foams. PMMA has also been employed as a support for nanoparticles with photocatalytic activity as well as to develop contact lenses, the transparency of nanocellular PMMA foams being a potential advantage in these applications [ 42 , 43 , 44 , 45 ].…”