51
|
Sivamurugan V, Vinu A, Palanichamy M, Murugesan V. Rapid and cleaner synthesis of 1,4-dihydropyridines in aqueous medium. HETEROATOM CHEMISTRY 2006. [DOI: 10.1002/hc.20197] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
52
|
Krithiga T, Vinu A, Ariga K, Arabindoo B, Palanichamy M, Murugesan V. Selective formation 2,6-diisopropyl naphthalene over mesoporous Al-MCM-48 catalysts. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2005.05.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
53
|
Vinu A, Satish Kumar G, Ariga K, Murugesan V. Preparation of highly ordered mesoporous AlSBA-15 and its application to isopropylation of m-cresol. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2005.03.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
54
|
Sivamurugan V, Kumar RS, Palanichamy M, Murugesan V. Synthesis of hantzsch 1,4-dihydropyridines under solvent-free condition using zn[(L)proline]2as lewis acid catalyst. J Heterocycl Chem 2005. [DOI: 10.1002/jhet.5570420534] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
55
|
Shankar M, Cheralathan K, Arabindoo B, Palanichamy M, Murugesan V. Enhanced photocatalytic activity for the destruction of monocrotophos pesticide by TiO2/Hβ. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcata.2004.03.059] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
56
|
Nandhini KU, Arabindoo B, Palanichamy M, Murugesan V. t-Butylation of phenol over mesoporous aluminophosphate and heteropolyacid supported aluminophosphate molecular sieves. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcata.2004.03.060] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
57
|
Shanmugapriya K, Anuradha R, Palanichamy M, Arabindoo B, Murugesan V. Vapour phase reaction of phenol with ethyl acetate over MCM-41 molecular sieves. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcata.2004.06.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
58
|
Vinu A, Murugesan V, Böhlmann W, Hartmann M. An Optimized Procedure for the Synthesis of AlSBA-15 with Large Pore Diameter and High Aluminum Content. J Phys Chem B 2004. [DOI: 10.1021/jp048411f] [Citation(s) in RCA: 203] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
59
|
Karthik M, Tripathi A, Gupta N, Palanichamy M, Murugesan V. Zeolite catalyzed electrophilic substitution reaction of indoles with aldehydes: synthesis of bis(indolyl)methanes. CATAL COMMUN 2004. [DOI: 10.1016/j.catcom.2004.04.007] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
|
60
|
Sakthivel S, Shankar MV, Palanichamy M, Arabindoo B, Bahnemann DW, Murugesan V. Enhancement of photocatalytic activity by metal deposition: characterisation and photonic efficiency of Pt, Au and Pd deposited on TiO2 catalyst. WATER RESEARCH 2004; 38:3001-3008. [PMID: 15261537 DOI: 10.1016/j.watres.2004.04.046] [Citation(s) in RCA: 281] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2002] [Revised: 04/02/2004] [Accepted: 04/16/2004] [Indexed: 05/24/2023]
Abstract
Pt, Au and Pd deposited TiO2 have been prepared and characterised by surface analytical methods such as surface area, XRD, and scanning electron micrograph and photophysical characterisation by diffuse reflectance spectroscopy. The photocatalytic activity of the doped catalysts was ascertained by the photo-oxidation of leather dye, acid green 16 in aqueous solution illuminated with low-pressure mercury lamp ( approximately 254 nm). The effect of metal contents on the photocatalytic activity was investigated. The highest photonic efficiency was observed with metal deposition level of less than 1 wt%.
Collapse
|
61
|
Vinu A, Murugesan V, Hartmann M. Adsorption of Lysozyme over Mesoporous Molecular Sieves MCM-41 and SBA-15: Influence of pH and Aluminum Incorporation. J Phys Chem B 2004. [DOI: 10.1021/jp037303a] [Citation(s) in RCA: 311] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
62
|
Savidha R, Pandurangan A, Palaichamy M, Murugesan V. Vapor-Phase Isopropylation of Phenol over Fe-Containing Al-MCM-41 Molecular Sieves. Catal Letters 2003. [DOI: 10.1023/b:catl.0000006317.76045.1f] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
63
|
Vinu A, Streb C, Murugesan V, Hartmann M. Adsorption of Cytochrome C on New Mesoporous Carbon Molecular Sieves. J Phys Chem B 2003. [DOI: 10.1021/jp035246f] [Citation(s) in RCA: 215] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
64
|
|
65
|
Rajesh B, Palanichamy M, Kazansky V, Murugesan V. Ethylation of ethylbenzene with ethanol over substituted medium pore aluminophosphate-based molecular sieves. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(02)00230-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
66
|
Hartmann M, Vinu A, Elangovan SP, Murugesan V, Böhlmann W. Direct synthesis and catalytic evaluation of AlSBA-1. Chem Commun (Camb) 2002:1238-9. [PMID: 12109100 DOI: 10.1039/b202662g] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The direct synthesis of the new mesoporous molecular sieve AlSBA-1 containing exclusively tetrahedrally coordinated aluminium and the catalytic activity of the novel material in the isomerization of n-decane are reported.
Collapse
|
67
|
Sakthivel S, Geissen SU, Bahnemann D, Murugesan V, Vogelpohl A. Enhancement of photocatalytic activity by semiconductor heterojunctions: α-Fe2O3, WO3 and CdS deposited on ZnO. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00055-2] [Citation(s) in RCA: 167] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
68
|
Neppolian B, Choi HC, Sakthivel S, Arabindoo B, Murugesan V. Solar light induced and TiO2 assisted degradation of textile dye reactive blue 4. CHEMOSPHERE 2002; 46:1173-1181. [PMID: 11951983 DOI: 10.1016/s0045-6535(01)00284-3] [Citation(s) in RCA: 149] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Aqueous solutions of reactive blue 4 textile dye are totally mineralised when irradiated with TiO2 photocatalyst. A solution containing 4 x 10(-4) M dye was completely degraded in 24 h irradiation time. The intensity of the solar light was measured using Lux meter. The results showed that the dye molecules were completely degraded to CO2, SO4(2-), NO3-, NH4+ and H2O under solar irradiation. The addition of hydrogen peroxide and potassium persulphate influenced the photodegradation efficiency. The rapidity of photodegradation of dye intermediates were observed in the presence of hydrogen peroxide than in its absence. The auxiliary chemicals such as sodium carbonate and sodium chloride substantially affected the photodegradation efficiency. High performance liquid chromatography and chemical oxygen demand were used to study the mineralisation and degradation of the dye respectively. It is concluded that solar light induced degradation of textile dye in wastewater is a viable technique for wastewater treatment.
Collapse
|
69
|
Rengaraj S, Moon SH, Sivabalan R, Arabindoo B, Murugesan V. Removal of phenol from aqueous solution and resin manufacturing industry wastewater using an agricultural waste: rubber seed coat. JOURNAL OF HAZARDOUS MATERIALS 2002; 89:185-196. [PMID: 11744204 DOI: 10.1016/s0304-3894(01)00308-9] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Activated carbon prepared from rubber seed coat (RSCC), an agricultural waste by-product, has been used for the adsorption of phenol from aqueous solution. In this work, adsorption of phenol on rubber seed coat activated carbon has been studied by using batch and column studies. The equilibrium adsorption level was determined to be a function of the solution pH, adsorbent dosage and contact time. The equilibrium adsorption capacity of rubber seed coat activated carbon for phenol removal was obtained by using linear Freundlich isotherm. The adsorption of phenol on rubber seed coat activated carbon follows first order reversible kinetics. The suitability of RSCC for treating phenol based resin manufacturing industry wastewater was also tested. A comparative study with a commercial activated carbon (CAC) showed that RSCC is 2.25 times more efficient compared to CAC based on column adsorption study for phenolic wastewater treatment.
Collapse
|
70
|
Neppolian B, Choi HC, Sakthivel S, Arabindoo B, Murugesan V. Solar/UV-induced photocatalytic degradation of three commercial textile dyes. JOURNAL OF HAZARDOUS MATERIALS 2002; 89:303-317. [PMID: 11744213 DOI: 10.1016/s0304-3894(01)00329-6] [Citation(s) in RCA: 236] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The photocatalytic degradation of three commercial textile dyes with different structure has been investigated using TiO(2) (Degussa P25) photocatalyst in aqueous solution under solar irradiation. Experiments were conducted to optimise various parameters viz. amount of catalyst, concentration of dye, pH and solar light intensity. Degradation of all the dyes were examined by using chemical oxygen demand (COD) method. The degradation efficiency of the three dyes is as follows: Reactive Yellow 17(RY17) > Reactive Red 2(RR2) > Reactive Blue 4 (RB4), respectively. The experimental results indicate that TiO(2) (Degussa P25) is the best catalyst in comparison with other commercial photocatalysts such as, TiO(2) (Merck), ZnO, ZrO(2), WO(3) and CdS. Though the UV irradiation can efficiently degrade the dyes, naturally abundant solar irradiation is also very effective in the mineralisation of dyes. The comparison between thin-film coating and aqueous slurry method reveals that slurry method is more efficient than coating but the problems of leaching and the requirement of separation can be avoided by using coating technique. These observations indicate that all the three dyes could be degraded completely at different time intervals. Hence, it may be a viable technique for the safe disposal of textile wastewater into the water streams.
Collapse
|
71
|
Rengaraj S, Moon SH, Sivabalan R, Arabindoo B, Murugesan V. Agricultural solid waste for the removal of organics: adsorption of phenol from water and wastewater by palm seed coat activated carbon. WASTE MANAGEMENT (NEW YORK, N.Y.) 2002; 22:543-548. [PMID: 12092764 DOI: 10.1016/s0956-053x(01)00016-2] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Adsorption studies for phenol removal from aqueous solution on activated palm seed coat carbon (PSCC) were carried out under varying experimental conditions of contact time, phenol concentration, adsorbent dose and pH. Adsorption equilibrium was reached within 3 h for phenolic concentrations 10-60 mg l(-1). Kinetics of adsorption obeyed a first order rate equation. The percent removal remained constant over the pH range 4-9 for a phenolic concentration of 25 mg (l-1). The equilibrium data could be described well by the Freundlich isotherm equation. The adsorption of phenol on PSCC follows the film diffusion process. A comparative study with a commercial activated carbon showed that PSCC is two times more effective than commercial activated carbon. The studies showed that the palm seed coat carbon can be used as an efficient adsorbent material for the removal of phenolics from water and wastewater.
Collapse
|
72
|
Sakthivel S, Neppoiian B, Palanichamy M, Arabindoo B, Murugesan V. Photocatalytic degradation of leather dye over ZnO catalyst supported on alumina and glass surfaces. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2001; 44:211-218. [PMID: 11695461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The photocatalytic degradation of leather dye, Acid green 16, has been investigated over a ZnO catalyst supported on two different materials, namely alumina and glass beads (3-5 mm diameter). Sunlight was used as the energy source. The alumina-supported ZnO outperformed the glass-supported ZnO under identical operational conditions suggesting that the dye molecules are adsorbed on the alumina supports to make a high concentration environment around the loaded ZnO. The degradation efficiency was greater at pH = 4 compared to other acidic and neutral pH. Also, the degradation efficiency was a little bit higher in alkaline medium, which correlates with the adsorption behaviour of acid green 16 on the alumina supported ZnO. The influence of inorganic oxidants like H2O2, FeCl3 and Fenton reagent on the degradation efficiency were systematically studied. The decolourisation and extent of degradation of the dye were determined by UV-VIS spectroscopy and COD reflux methods, respectively. Complete mineralisation of the dye was conformed by High performance liquid chromatography (HPLC) analysis.
Collapse
|
73
|
Guhanathan S, Devi MS, Murugesan V. Effect of coupling agents on the mechanical properties of fly ash/polyester particulate composites. J Appl Polym Sci 2001. [DOI: 10.1002/app.2017] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
74
|
Neppolian B, Sakthivel S, Arabindoo B, Palanichamy M, Murugesan V. Kinetics of photocatalytic degradation of reactive yellow 17 dye in aqueous solution using UV irradiation. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2001; 36:203-213. [PMID: 11382021 DOI: 10.1081/ese-100102618] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In this paper photoinduced degradation of reactive yellow 17 (RY 17) dye has been studied employing TiO2 in the form of slurry in a batch reactor. UV lamps were used as the source for irradiation. The disappearance of the dye in the solution follows approximately pseudo-first order kinetics. The apparent rate constant decreases with increase in initial concentration of the dye. The addition of oxygen, hydrogen peroxide and persulphate ion influences the degradation rate of the dye. The formation of CO2, SO4(2-), NO3- and NH4+ ions have been identified in the mineralisation process. The decolourisation and mineralisation were followed by UV-Visible spectrophotometer and high performance liquid chromatography respectively. The results reveal that photocatalytic degradation may be a useful technique in the removal of reactive dyes in wastewater from textile industries.
Collapse
|
75
|
|
76
|
Neppolian B, Sakthivel S, Arabindoo B, Palanichamy M, Murugesan V. Photocatalytic degradation of textile dye commonly used in cotton fabrics. RECENT ADVANCES IN BASIC AND APPLIED ASPECTS OF INDUSTRIAL CATALYSIS, PROCEEDINGS OF 13TH NATIONAL SYMPOSIUM AND SILVER JUBILEE SYMPOSIUM OF CATALYSIS OF INDIA 1998. [DOI: 10.1016/s0167-2991(98)80304-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
77
|
Elangovan S, Murugesan V. Catalytic transformation of cyclohexanol over aluminophosphate-based molecular sieves. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s1381-1169(96)00391-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
78
|
Elangovan SP, Arabindoo B, Krishnasamy V, Murugesan V. Catalytic transformation of camphene over aluminophosphate-based molecular sieves. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/ft9959104471] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
79
|
Yousef GE, Bell EJ, Mann GF, Murugesan V, Smith DG, McCartney RA, Mowbray JF. Chronic enterovirus infection in patients with postviral fatigue syndrome. Lancet 1988; 1:146-50. [PMID: 2892990 DOI: 10.1016/s0140-6736(88)92722-5] [Citation(s) in RCA: 208] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
76 patients with the postviral fatigue syndrome (PVFS) and 30 matched controls were investigated. Virus isolation was attempted from concentrated faecal samples by direct culture and after acid dissociation of virus from antibody. Positive cultures of enteroviruses were obtained from 17 (22%) patients and 2 (7%) controls. An enterovirus-group-specific monoclonal antibody, 5-D8/1, directed against the VP1 polypeptide, was used to detect enteroviral antigen in the circulation, either free or complexed with antibody. VP1 antigen was detected in the serum of 44 (51%) of a further group of 87 PVFS patients. The number of patients positive for VP1 antigen was greater (42/44) when IgM complexes were detectable than when they were not (2/23). 1 year later, the 17 patients of the first group of 76 with positive cultures were again studied. The same virus was again isolated from 5 (29%), 13 (76%) had detectable IgM responses to enteroviruses, and 9 (53%) were positive for VP1 antigen in the serum. These results show that chronic infection with enteroviruses occurs in many PVFS patients and that detection of enterovirus antigen in the serum is a sensitive and satisfactory method for investigating infection in these patients.
Collapse
|