NOPR Collection:

Studies of metal ion uptake behaviour of formaldehyde condensed resins of phenolic Schiff bases derived from the reaction of 4,4' -diaminodiphenyl and 4, 4' -diaminodiphenylmethane with o-hydroxybenzaldehyde

Wed, 01 Sep 2004 00:00:00 GMT

Title: Studies of metal ion uptake behaviour of formaldehyde condensed resins of phenolic Schiff bases derived from the reaction of 4,4' -diaminodiphenyl and 4, 4' -diaminodiphenylmethane with o-hydroxybenzaldehyde Authors: Dey, R K; Acharya, S; Samal, S; Ra, A R Abstract: The metal ion uptake characteristics of two new chelating resins, o-HB-DDM-HCHO and o-HB-DD-HCHO, were examined towards transition metal ions like Cu²⁺, Ni²⁺ and UO₂²⁺under both competitive and non-competitive conditions. The resin o-HB-DDM-HCHO was found to be more effective in removing metal ions in comparison to resin o-HB-DDHCHO. Preferential adsorption of Cu²⁺ by both the resins was observed from the mixture of salt solution. Elution of the sorbed metal ions using dilute HCI resulted in removal of nearly 30-40% of the loaded Cu²⁺ and 34-45% of loaded UO₂²⁺from the resin column. Page(s): 695-703

Synthesis of glycylcalix[6]arene and its applicability as resin for separation and preconcentration of trace transition metals

Wed, 01 Sep 2004 00:00:00 GMT

Title: Synthesis of glycylcalix[6]arene and its applicability as resin for separation and preconcentration of trace transition metals Authors: Bhatt, H; Agrawal, Y K Abstract: A new glycylcalix[6]arene is synthesized by the reaction of glycine ethyl ester hydrochloride with acid chloride of p-carboxycalix[6]arene. Its physical properties, void volume, density, swelling, cation exchange capacity and t_1/2 have been determined. The glycylcalix[6]arene is used as resin and its metal ion exchange capacities are determined. Mn(II), Fe(II), Co(II), Cu(II), Ni(II) and Zn(II) were absorbed at 5.5, 4.5, 6.0, 4.0, 4.8 and 5.0 pH, respectively. These were eluted with NaF, H₂SO₄, acetic acid, tartrate and HCl_. The chromatographic separation of Mn(II), Fe(II) Co(II), Ni(II), Cu(II) and Zn(II) from each other was studied. These metals were preconcentrated on resin and determined in blood plasma and in the environment samples. Page(s): 688-694

Ethylation of benzene over AFI type molecular sieves

Wed, 01 Sep 2004 00:00:00 GMT

Title: Ethylation of benzene over AFI type molecular sieves Authors: Raj, K Joseph Antony; Vijayaraghavan, V R Abstract: Large pore aluminophosphate-based molecular sieves, MgMnAPO-5 and MnZnAPO-5, were synthesized by hydrothermal methods. The samples were characterised by the techniques of XRD, FT-IR, ³¹P and ²⁷Al MAS-NMR spectra, BET-surface area, n-butylamine-TPD and ICP-MS chemical analysis. The catalytic performance of these materials has been examined for ethylation of benzene with ethanol in the vapour phase. The products were ethylbenzene, p-diethylbenzene, m-diethylbenzene, o-diethylbenzene and PAB[(1,2,4 and 1,3,5-triethylbenzene) and (1,2,4,5-tetraethylbenzene)]. Maximum conversion (20.6%) was observed at 400^oC over MnZnAPO-5. Page(s): 678-682

Decolourization of synthetic dyes using rice straw attached pleurotus ostreatus

Wed, 01 Sep 2004 00:00:00 GMT

Title: Decolourization of synthetic dyes using rice straw attached pleurotus ostreatus Authors: Neelamegam, R; Baskaran, V; Dhanasekar, R; Viruthagiri, T Abstract: Preliminary studies were conducted to assess the degree of decolourization of different dyes such as Malachite green, Indigo carmine, Xylidine ponceau, Bismark brown, Congo red and Methyl orange using the white rot fungus Pleurotus ostreatus. The effect of initial concentration of different dyes on the decolourization was studied. The effect of pH and biomass concentration during decolourization were also observed for all the dyes. The time course of decolourization was also characterised for all the dyes at their optimum concentrations. An improved percent decolourization [95%] was achieved for Xylidine ponceau, Methyl orange, Congo red and Bismark brown with the rice straw attached Pleurotus ostreatus Page(s): 622-625