Adsorption of methylene blue dye from aqueous solution by a novel PVA/CMC/halloysite nanoclay bio composite: Characteriz
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RESEARCH ARTICLE
Adsorption of methylene blue dye from aqueous solution by a novel PVA/CMC/halloysite nanoclay bio composite: Characterization, kinetics, isotherm and antibacterial properties Sabarish Radoor 1
&
Jasila Karayil 2 & Jyotishkumar Parameswaranpillai 1 & Suchart Siengchin 1
Received: 26 June 2020 / Accepted: 21 September 2020 # Springer Nature Switzerland AG 2020
Abstract Here the fabrication of a novel PVA/CMC/halloysite nanoclay membrane for the effective adsorption of cationic dye (methylene blue, MB) from aqueous environment is reported. The membranes were analyzed through scanning electron microscopy (SEM), optical microscopy (OM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), contact angle and universal testing machine (UTM) analysis. The adsorption behavior of the membrane in terms of nanoclay loading, contact time, initial concentration of MB, pH and temperature were also discussed. The membrane exhibits excellent removal efficiency (99.5%) for MB in the optimal conditions such as nanoclay dose = 6 wt%, initial dye concentration = 10 ppm, contact time = 240 min, pH = 10 and temperature = 30 °C. Three isotherm models (Freundlich, Langmuir and Temkin) were employed to analyze the dye adsorption data. The results revealed that the adsorption process could be described well with both Freundlich and Langmuir isotherm model. The kinetics of MB adsorption onto membrane follows pseudo-second-order model while thermodynamic parameter indicate that adsorption is feasible and endothermic in nature. The antibacterial studies revealed that the PVA/CMC/halloysite nanoclay membrane possess notable antibacterial property. Finally, the desorption studies showed that the membrane have good reusability even after four recycles. Keywords Halloysite nano clay . Bio-composite . Adsorption mechanism . Methylene blue . Isotherm models . Kinetics . Thermodynamics
Introduction Water pollution is a global issue which is rising in an alarming rate. It has a serious impact on the climate, food chain and to our ecosystem. Hence researchers all over the globe have focused their attention to develop an efficient treatment method to tackle this issue [4, 9, 10, 59, 68, 92]. Adsorption process is one of the best choices for the removal of toxic contaminants from water as it possesses many
* Sabarish Radoor [email protected] * Suchart Siengchin [email protected] 1
Department of Mechanical and Process Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, 1518 Wongsawang Road, Bangsue, Bangkok 10800, Thailand
2
Government Women’s Polytechnic College, Calicut, Kerala, India
benefits over other treatment method such as flocculation, ion exchange, electrochemical treatment, photocatalytic degradation, biodegradation etc. [12, 14, 15, 22, 23, 46, 81, 82]. The adsorbent which is cheap, non-toxic and environmentalfriendly is preferred over toxic and synthet
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