Abstract
AbstractA series of chitosan and Laponite based nano-composite adsorbents, which showed an excellent performance for fast and efficient removal of Cd(II), methylene blue (MB) and Congo red (CR) from aqueous solution, were prepared. In the adsorbent, with the increase of Laponite component, the surface area increased from 44.69 m2g-1to 64.58 m2g-1. As a result, the adsorption rates were enhanced by increasing Laponite component. The adsorption capacities for Cd(II) and MB increased with increasing Laponite component due the cationic characteristic of two pollutants, and the opposite result was found for the removal of CR. The impacts of some factors, e.g. solution pH, temperature, pollutant concentration and salt, on the adsorption capacity were investigated. Additionally, this adsorbent could be effectively regenerated by dilute HCl solution after the adsorption of Cd(II), and the mixture of methanol and acetic acid was a suitable eluent after the adsorption of two dyes.
Highlights
Let F denote a eld and let V denote a vector space over F with nite positive
A series of chitosan and LCaplaosnsiitecbaatsieodn:n1a7nBo3-7, 1A5sA2a1result of rapid urbanization and industrialization, composite adsorbents, which showed an excellent water pollution, which is caused by the continuous release performance for fast and efficient removal of Cd(II), of toxic pollutants from heavy metals, dyes, synthetic methylene blue (MB) and Congo red (CR) from aqueous manure and organic compounds into the encompassed
The peak at 1109 cm-1 is classically assigned to the absorption band of polysaccharide molecule backbone, which indicates the introduction of chitosan component in four samples [3]
Summary
Chitosan with a deacetylation degree of 85% was purchased from Jinan Haidebei Marine Bioengineering Co. (China), and purified twice as follows: it was dissolved in HCl solution with a concentration of 0.1 mol L-1, the solution was filtered and precipitated with ethanol, and the product was dried in vacuo at 50°C for 48 h. Chitosan with a deacetylation degree of 85% was purchased from Jinan Haidebei Marine Bioengineering Co. (China), and purified twice as follows: it was dissolved in HCl solution with a concentration of 0.1 mol L-1, the solution was filtered and precipitated with ethanol, and the product was dried in vacuo at 50°C for 48 h. The average molecular weight of chitosan was measured by intrinsicviscosity method and the result was 2.4 × 105 g mol-1. Laponite XLG (Mg5.34Li0.66Si8O20(OH)4Na0.66) was obtained from Rockwood (Wesel, Germany). Monomers, including acrylic acid (AA, 98%), acrylamide (AM, 98%), 2-acrylamido-2-methylpropanesulfonic acid (AMPS, 98%), initiator potassium persulfate (KPS, 99%) and crosslinker N,N’-methylenebisacrylamide (MBA, 98%) were obtained from Shanghai Sinopharm Chemical Reagent Co. Ltd. Other chemicals were of analytical grade and used as received
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