Solar light assisted degradation of dyes and adsorption of heavy metal ions from water by CuO–ZnO tetrapodal hybrid nanocomposite

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

“…[1][2][3] In this regard, chromium (Cr) is one of the most common heavy metal pollutants usually present in trace amounts in natural waters due to its wide range of application in the electroplating, steel production, pigments, alloying, tanning of leather, textile dyes, chemical manufacturing, metal corrosion, inhibitors, refractory bricks, battery, mordants, and several other industrial applications. [4][5][6][7][8] The discharge of untreated or poorly treated effluent coming from such industries always poses a severe threat to the abiotic and the biotic environment leading to the contamination of natural resources of soil and water. 1,9 Though Cr exists in several oxidation states ranging from II to VI, only trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) species remain the most stable and common forms of Cr in the environment.…”

Adsorption removal of Congo red onto L-cysteine/rGO/PANI nanocomposite: equilibrium, kinetics and thermodynamic studies

“…Among all these methods, adsorption proved itself as a promising removal method credited to the merits of cost effectiveness, high designation flexibility, high performance in removal of small molecules, least fluctuations, resistance to toxic matter, low discharge ratio and easy handling [12][13][14]. For dye removal, various types of adsorbents are extensively studied including activated carbon [15], metal oxides [16], polymers [17], zeolites [18], agricultural residues [19] CuO-ZnO tetrapodal hybrid [20], Cu-WO 3 [21] tpolydimethylsiloxane@zinc oxide tetrapod@iron oxide nanorod nanohybrid [22], ZnO-tetrapods/activated carbon (ZnO-T/AC) nanocomposite [23] and carboxylated cellulose nanofibril films [24]. But among them, few adsorbents face some difficulties like low adsorption capacity, insufficient extraction and issues of recycling and reuse [25].…”

Using a Modified Polyamidoamine Fluorescent Dendrimer for Capturing Environment Polluting Metal Ions Zn2+, Cd2+, and Hg2+: Synthesis and Characterizations

“…Fossil fuel burning, petrochemistry, milling, mining, industrialization, textile and leather production, and agricultural processes all release heavy metals on a daily basis, which represents a major global threat to human health and ecosystem balance. Heavy metals are harmful to humans, animals, and plants due to their propensity to bioaccumulation, high toxicity, and carcinogenicity [1][2][3][4][5][6][7][8][9][10]. Chromium (Cr), arsenic (As), cadmium (Cd), mercury (Hg), lead (Pb), and other heavy metals are extremely toxic to humans even at very low concentrations of several micrograms per liter.…”