Reduction of Hexavalent Chromium Using Sorbaria sorbifolia Aqueous Leaf Extract

Abstract

Aqueous plant leaves extract (PLE) of an abundant shrub, Sorbaria sorbifolia, was explored for the reduction of hexavalent chromium, Cr(VI), to trivalent chromium, Cr(III). The effect of contact time, pH, PLE quantity, ionic strength, hardness, temperature and effective initial Cr(VI) ion concentration were tested; Cr(VI) reduction followed the pseudo-first order rate kinetics and maximum reduction was observed at pH 2. Significantly, Cr(VI) reduction efficacies varied from 97 to 66% over the pH range of 2 to 10, which bodes well for PLE to be used for the reduction of Cr(VI) also at a higher pH. PLE-mediated Cr(VI) reduction displays considerable efficiency at various ionic strengths; however, hardness strongly affects the reduction ability. Higher temperature significantly enhances the Cr(VI) reduction. This study reveals the potential use of PLE as a green reducing agent in aqueous extract for the efficient reduction of Cr(VI) to Cr(III).

Scrutinizing antioxidant interactions between green tea and some medicinal plants commonly used as herbal teas

“…The differences in absorption intensities may be due to variation in number of functional groups corresponding to that particular wave number. Earlier studies also reported major peaks in similar regions for GT, O. gratissimum, C. citratus, C. flexuosus, and H. rosa sinensis (Dubey, Sillanpaa, & Varma, ; Irshad et al, ; Sathiyamoorthi & Sankaranarayanan, ). Interestingly, GT combinations demonstrated similar spectra, as that of GT single infusion except few additional peaks in the region 3600–4000 cm −1 that may be assigned to free OH of alcohol (Siripatrawan & Harte, ).…”

“…These changes may possibly affect the estimation of TPC by Folin-Ciocalteu method. (Dubey, Sillanpaa, & Varma, 2017;Irshad et al, 2018;Sathiyamoorthi & Sankaranarayanan, 2017). Interestingly, GT combinations demonstrated similar spectra, as that of GT single infusion except few additional peaks in the region 3600-4000 cm −1 that may be assigned to free OH of alcohol (Siripatrawan & Harte, 2010).…”

Synthesis, characterization, and catalytic application of ecofriendly Ca‐bridged aminoclay

“…This is due to the above said reasons. The Pt/reduced graphite oxide (RGO) system showed the k app value for the reduction of individual NP is 1.11 × 10 −3 s −1 . The Ca‐AC system showed better results as compared with the literature.…”

“…The Pt/reduced graphite oxide (RGO) system showed the k app value for the reduction of individual NP is 1.11 × 10 −3 s −1 . 26 The Ca-AC system showed better results as compared with the literature. The biosourcemediated catalytic reduction of chromium (VI) yielded the k app value of 1.39 × 10 −3 s −1 .…”

Combined Effect of Spirulina Platensis and Punica Granatum Peel Extacts: Phytochemical Content and Antiphytophatogenic Activity

“…Furthermore, the growing interest in biological food additives has challenged the scientific community to innovate in alternative food preservation and plant crop protection systems. Thus, natural preservatives from sources like bacteria, plants and algae were reported to ensure food safety due to their antimicrobial activity against a wide spectrum of foodborne pathogens [3,4]. In this regard, dietary antioxidants (i.e., phenolic compounds) have recently attracted extensive attention because of their ubiquity in nature and their various beneficial effects, including antimicrobial, antioxidant, antiinflammatory and antiproliferative activities [5].…”