02211nas a2200289   4500008004100000022001400041245016400055210006900219260011000288300001000398490000700408520106800415653003101483653002701514653002501541653003301566653001601599653003501615653001901650653002001669100001801689700002001707700002201727700002601749700002301775856012301798       2016                        eng d  a0376-471000aPhotocatalytic degradation of ciprofloxacin center dot HCl using Aeroxide (R) P-25 TiO2 photocatalyst: comparative evaluation of solar and artificial radiation0 aPhotocatalytic degradation of ciprofloxacin center dot HCl using  aDR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATION-NISCAIRcJAN  a16-220 v553 a<p>The photocatalytic degradation of ciprofioxacin (CFX) has been investigated using Aeroxide (R) P-25 TiO2 photocatalyst in the presence of solar as well as artificial radiation. The effects of different operating parameters like initial concentration of CFX, catalyst loading, pH of solution and effect of co-existing ions on photocatalytic degradation of CFX have been investigated with a view to establish the optimum operating conditions. It is observed that as the initial concentration of CFX increases, the rate of photocatalytic degradation decreases. Optimum catalyst loading is observed at 1 g L-1 for CFX concentration of 100 mg L-1. Over the pH range 3-11, maximum degradation rate occurs at pH 9. The mechanism and intermediates formed during the photocatalytic degradation of CFX are discussed based on UPLC-MS/MS analysis. From kinetic studies, it is found that the photocatalytic degradation obeys pseudo-first order kinetics. The degradation rate constant using solar radiation is about 1.7 times higher than that under artificial radiation.</p>10aAdvanced oxidation process10aAeroxide (R) P-25 TiO210aArtificial radiation10aCiprofloxacin center dot HCl10aDegradation10aPharmaceutical micropollutants10aPhotocatalysis10aSolar radiation1 aShetty, Rohit1 aKothari, Gaurav1 aTambe, Amruta, S.1 aKulkarni, Bhaskar, D.1 aKamble, Sanjay, P.  uhttp://library.ncl.res.in/content/photocatalytic-degradation-ciprofloxacin-center-dot-hcl-using-aeroxide-r-p-25-tio2-002170nas a2200169   4500008004100000245014400041210006900185260000800254490000700262520148400269100001801753700002201771700003201793700002601825700002301851856012601874       2017                        eng d00aPhotocatalytic degradation of pharmaceuticals pollutants using N-doped TiO 2 photocatalyst: identification of CFX degradation intermediates0 aPhotocatalytic degradation of pharmaceuticals pollutants using N  cFEB0 v593 aThe N-doped TiO2 photocatalyst was synthesized by the sol–gel method and characterized in detail in terms of its morphology, structure and composition. The prepared N-doped TiO2 exhibited polycrystalline structure having particle sizes of around 50–120 nm and rod-shaped geometry. The N-doped TiO2 was subsequently used for the photocatalytic degradation (PCD) of pharmaceutical micropollutants, namely ciprofloxacin HCl (CFX), naproxen (NPX) and paracetamol (PARA) and it was found that the rate of degradation of CFX and NPX is higher than that of PARA. To verify the beneficial effect of N-doped TiO2 for PCD of CFX, similar experiments were carried out using commercially available Aeroxide P-25 TiO2. It was observed that N-doped TiO2 was more efficient than Aeroxide® P-25 TiO2. It was also found that the PCD of CFX in the presence of N-doped TiO2 was highly efficient under the solar radiation as compared with artificial radiation. The effect of various operating parameters, such as adsorption of CFX, pH of the aqueous solution, effect of co-existing ions on PCD of CFX, was investigated using artificial radiation and optimum conditions were established. The intermediates formed during the PCD of CFX were identified using liquid chromatography tandem mass chromatography (LC-MS/MS). The presented results demonstrate that N-doped TiO2 photocatalyst shows excellent photocatalytic activity in the visible region for the degradation of pharmaceutical pollutants.1 aShetty, Rohit1 aChavan, Vilas, B.1 aKulkarni, Prashant, Shripad1 aKulkarni, Bhaskar, D.1 aKamble, Sanjay, P.  uhttp://library.ncl.res.in/content/photocatalytic-degradation-pharmaceuticals-pollutants-using-n-doped-tio-2-photocatalyst02498nas a2200265   4500008004100000022001400041245014800055210006900203260000800272300001100280490000800291520156300299653001901862653001801881653002401899653001301923653002601936653002701962100002201989700001802011700002302029700002302052700002702075856013002102       2020                        eng d  a0045-653500aScreening of zero valent mono/bimetallic catalysts and recommendation of Raney Ni (without reducing agent) for dechlorination of 4-chlorophenol0 aScreening of zero valent monobimetallic catalysts and recommenda  cJUL  a1262980 v2503 a<p>Chlorophenol (CP) is considered as environmentally hazardous material due to its acute toxicity, persistent nature and strong bioaccumulation. The dechlorination of 4-CP was investigated by using various catalysts such as bimetallic (Fe-0/Cu-0, Al-0/Fe-0), Pd/C, Raney Ni and Fe-0 at room temperature. Among the catalysts studied, Raney Ni proved to be very economical and efficient catalyst that worked without the use of an external reducing agent. The dechlorination of 4-CP by Raney Ni was therefore further explored. Complete dechlorination of 4-CP (30 mg L-1) was achieved in 6 hat an optimum Raney Ni catalyst loading of 3 g L-1. The effect of triethylamine (TEA) and tripropylamine (TPA) was also investigated and it was observed that 100% dechlorination is possible in presence of 45 mg L-1 of TEA. The kinetics of dechlorination of 4-CP was investigated and found to be first order with a rate constant of 0.017 min(-1) at 50 degrees C, and it enhances to 0.109 min(-1) with addition of TEA. In the absence of a reducing agent, acidic to neutral pH favors dechlorination of 4-CP. The final product of dechlorination was estimated to be phenol by performing HPLC, LCMS and NMR analysis. Based on the results, a probable dechlorination mechanism of 4-CP is also proposed. It can be concluded that the catalytic hydrodechlorination is an effective and economical technique for dechlorination of 4-CP and it has a potential for the dechlorination of other toxic derivatives of chlorinated aromatics. (C) 2020 Elsevier Ltd. All rights reserved.</p>
10a4-Chlorophenol10aCl- scavenger10aHydrodechlorination10aRaney Ni10aRecycling of catalyst10aWithout reducing agent1 aRaut, Sandesh, S.1 aShetty, Rohit1 aRaju, Nikhi, Maria1 aKamble, Sanjay, P.1 aKulkarni, Prashant, S.  uhttp://library.ncl.res.in/content/screening-zero-valent-monobimetallic-catalysts-and-recommendation-raney-ni-without-reducing