A comparison study of adsorption of Cr(VI) from aqueous solutions onto alkyl-substituted polyaniline/chitosan composites

Competitive adsorption of Reactive Orange 16 and Reactive Brilliant Blue R on polyaniline/bacterial extracellular polysaccharides composite—A novel eco-friendly polymer

“…The positive value of S • suggests the affinity and increased randomness at the solid-liquid interface in the adsorption of reactive dyes onto Pn/EPS composite surface. The results are in agreement with the observation of Yavuz et al [30] on adsorption of chromium onto alkyl-substituted polyaniline/chitosan composite. Table 3 represents the adsorption capacities of Pn/EPS with other adsorbents.…”

Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers

“…It is evident from the graph that the Cr(VI) removal by SAP nanofibers was increased with the decreasing in solution pH. Similar trends were reported by Karthik and Meenakshi [20], Ayes et al [18] and Hena [21]. This is due to the protonation of the carboxylate, hydroxyl and amine groups present in the SAP nanofibers at lower pH levels which facilitate higher Cr(VI) removal by electrostatic adsorption.…”

“…After the in-situ polymerization, the resulted material has possessed the enhanced sorption capacity than the individual components. Likewise, there are few reports focused on the synthesis of bio-conducting polymeric composites and demonstrated as an efficient adsorbent for the removal of Cr(VI) ion from aqueous solution [16,18,19,21]. Nevertheless, there are no reports on the removal of Cr(VI) ions from aqueous solution using polyaniline-sodium alginate nanofibers.…”

“…The most possible reason could be the presence of large amounts of amine (-NH) groups in the polymer enable them as a suitable candidate for the removal of heavy metals and easy of synthesis. Subsequently, extensive research has been involved to modify PANI and PPy with several materials in order to increase the sorption capacity and also make them into more processable in water treatment process [14][15][16][17][18][19].…”

Controllable Synthesis of Zn2GeO4Nanorods for Photocatalytic Reduction of Aqueous Cr(VI) and Oxidation of Organic Pollutants

“…From Figure 4, the initial pH plays an important role for the photocatalytic reduction of Cr(VI). In general, the Cr(VI) species may be in the form of Cr 2 O 7 2− , HCrO 4 − , and CrO 4 2− in aqueous solution [29][30][31]. Photon energy (eV) The predominant form of Cr(VI) is HCrO 4 − at a pH range from 2.0 to 6.0, while the major form was CrO 4 2− at pH above 7.0 [32,33].…”