http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/518 Thu, 30 Oct 2025 07:00:59 GMT 2025-10-30T07:00:59Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/527 Title: Efficient attenuation of 17a-ethynylestradiol (EE2) and tetracycline using novel hybrid materials: batch and column reactor studies Authors: Thanhmingliana Abstract: Clay minerals are composed of ne particles of hydrous aluminosilicates, and develop plasticity when mixed with water. A common characteristic of clay minerals is their layer structure, although they have diverse chemical, mineralogical, and physical characteristics. Clays possess a permanent net negative charge because of isomorphous substitution, which is responsible for the presence of exchangeable cations in the interspace region.1–3 Therefore, the electrical charge possessed by clay minerals and their microscale porosity makes them suitable as natural sorbing materials for several pollutants in the treatment of contaminated water. Although clay minerals are used widely to decontaminate inorganic pollutants from wastewater, pristine clay minerals possesses low sorption capacity for several hydrophobic and low- or nonpolar organic pollutants owing to the hydrophilic nature of these materials.4 Moreover, most clays show low settling capacity, limiting their wider practical application in wastewater treatment.5 The exchange of clay cations with organic cations produces useful hybrid materials for the attenuation of several non-polar organic contaminants (NOC) from aqueous solutions.6–10 Likewise, hybrid materials obtained by pillaring with poly(hydroxo-metal) cations and simultaneous intercalation of suitable organic cations are particularly suitable for wastewater treatment, because these materials show good affinity for organic impurities, and possess satisfactory settling capacity, allowing easy separation of solid and aqueous components.3 Thu, 01 Jan 2015 00:00:00 GMT http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/527 2015-01-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/525 Title: Application of Nanopillars-TiO2 Thin Films in the Photocatalytic Degradation of Methyl Parathion from Aqueous Solution Authors: Thanhmingliana Abstract: The photocatalytic activity of Nanopillars-TiO2 thin films S1 (without PEG) and S2 (with PEG) was assessed in the degradation of Methyl Parathion (MPT) from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM, AFM and BET analytical methods. Results showed that pH 6.0 was an optimum pH for the photocatalytic degradation of MPT using the UV light and lower initial pollutant concentration greatly favoured the MPT degradation using the thin films. The time dependence photocatalytic degradation of MPT was demonstrated with the pseudo-first-order rate kinetics. Overall degradation efficacy was in the order: S2 > S1 > UV. Study was further extended with total organic carbon measurement using the TOC (Total Organic Carbon) analysis. This demonstrated an apparent mineralization of MPT from aqueous solutions. Mon, 01 Jan 2018 00:00:00 GMT http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/525 2018-01-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/524 Title: Efficient removal of 17β-estradiol using hybrid clay materials: Batch and column studies Authors: Thanhmingliana Abstract: Hybrid materials were obtained modifying the bentonite (BC) and local clay (LC) using hexadecyltrimethylammonium bromide (HDTMA) or the clay were pillared with aluminum followed by modification with HDTMA. The materials were characterized by the SEM, FT-IR and XRD analytical tools. The batch reactor data implied that the uptake of 17β-estradiol (E2) by the hybrid materials showed very high uptake at the neutral pH region. However, at higher and lower pH conditions, slightly less uptake of E2 was occurred. The uptake of E2 was insignificantly affected changing the sorptive concentration from 1.0 to 10.0 mg/L and the background electrolyte (NaCl) concentrations from 0.0001 to 0.1 mol/L. Moreover, the sorption of E2 by these hybrid materials was fairly efficient since within 30 mins of contact time, an apparent equilibrium between solid and solution was achieved, and the data was best fitted to the PSO (pseudo-second order) and FL-PSO (Fractal-like-pseudo second order) kinetic models compared to the PFO (pseudo-first order) model. The fixed-bed column results showed that relatively high breakthrough volume was obtained for the attenuation of E2 using these hybrid materials, and the loading capacity of E2 was estimated to be 75.984, 63.757, 58.965 and 49.746 mg/g for the solids BCH, BCAH, LCH and LCAH, respectively. Fri, 01 Jan 2016 00:00:00 GMT http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/524 2016-01-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/519 Title: Hybrid materials precursor to natural bentonite in the decontamination of Alizarin Yellow from aqueous solutions Authors: Thanhmingliana Abstract: The present study aims to investigate the insights of Alizarin Yellow removal by hybrid materials precursor to natural bentonite. The hybrid materials employed are bentonite modified with hexadecyltrimethylammonium bromide (HDTMA) (BnH) and aluminium pillared HDTMA bentonite (BnAH). Surface morphology of materials are obtained with scanning electron microscopy-Energy dispersive X-ray analysis (SEM-EDX). The batch reactor operations conducted in the removal of Alizarin Yellow by these solids for various parametric studies which enabled to deduce the mechanism involved at solid/solution interface. Sorption capacity and selectivity was increased significantly using hybrid materials in the removal of AY. Hybrid materials showed very high removal capacity of AY and apparently unaffected at varied pH (4.0−10.0) and sorptive concentrations 1.0 to 25.0 mgL-1. Kinetic studies indicated that an apparent equilibrium occurred within 5–10 min of contact and the kinetic data was better fitted to the pseudo-second-order kinetic model. The percent removal of AY was not affected by increasing the background electrolyte (NaCl) concentration to 0.1 molL-1 and in presence of several co-existing ions. It is revealed that the hybrid materials are found more organophilic and AY molecule bound with strong forces at the surface of hybrid materials. Sat, 01 Jan 2022 00:00:00 GMT http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/519 2022-01-01T00:00:00Z