Enhanced adsorption removal of methyl orange from aqueous solution by nanostructured proton-containing δ-MnO<sub>2</sub>

Liu, Yan; Luo, Chao; Sun, Jian; Li, Haizhen; Sun, Zebin; Yan, Shan

doi:10.1039/c4ta07112c

Cited by 128 publications

(75 citation statements)

References 59 publications

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“…Therefore, 8.0 g/L amount of MOCS was an optimum dose for 500 μg/L concentration of Pb(II) and Zn(II) solutions. The increase in adsorption with the increase in the amount of MOCS was attributed to the number of binding sites available for both Pb(II) and Zn(II) ions [46]. Higher adsorption of Zn(II) in comparison to Pb(II) might be due to difference in size and electro-negativities [47].…”

Section: Effect Of Adsorbent Dosementioning

confidence: 99%

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

Chaudhry

Khan²,

Ali³

2016

Egyptian Journal of Basic and Applied Sciences

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Available online A B S T R A C TManganese oxide-coated sand, MOCS, was synthesized and characterized by XRD, FTIR, SEM, and EDX techniques, and was used for the adsorption of Pb(II) and Zn(II) from their aqueous solutions. The metal ion concentration, contact time, MOCS dose and pH of the solutions were optimized. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were studied and the maximum adsorption capacities for Pb(II) and Zn(II) were found to be 147.06 and 116.28 μg/g at 40°C and 27°C, respectively. These values are higher than many tested adsorbents. The energy 0.011 and 0.079 kJ/mol for Pb(II) and Zn(II) indicated adsorption as physical process. In thermodynamics the free energy change for Pb(II) ranged between −12.344 and −11.371 kJ/mol and that for Zn(II) ranged −9.638 to −11.155 kJ/mol between 27 and 40°C that predicted the spontaneity of process. The enthalpy change −39.816 and 25.574 kJ/mol indicated the exothermic and endothermic nature of the adsorption of Pb(II) and Zn(II). Kinetic studies indicated that Pb(II) adsorption followed pseudo-second order, whereas Zn(II) followed partial pseudo-first and pseudo-second order rates. The adsorptions of both metals were controlled by film diffusion step.

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Section: Effect Of Adsorbent Dosementioning

confidence: 99%

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

Chaudhry

Khan²,

Ali³

2016

Egyptian Journal of Basic and Applied Sciences

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“…3a also shows that most of the MO is adsorbed to achieve equilibrium adsorption within 180 min, which indicates excellent adsorption performance and rapid removal of MO from water. The adsorption experiments were conducted at four different temperatures (25,35,45, and 55°C), and the results are shown in Fig. 3b.…”

Section: Science China Materialsmentioning

confidence: 99%

“…The adsorption data for MO at different temperatures (25,35,45, and 55°C) (Fig. 3b) were linearly plotted as lnk vs. 1/T (Fig.…”

Section: Articlesmentioning

confidence: 99%

Polyethylenimine nanofibrous adsorbent for highly effective removal of anionic dyes from aqueous solution

Zhang

et al. 2016

Sci. China Mater.

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(Li J)) most common byproducts of the paint manufacture, dyeing, cosmetics, textile, paper, leather, and other industries, and it can poison the environment and endanger the safety of drinking water and foodstuffs [5,6]. Therefore, removal of organic dye from water is a major project for the development of a sustainable society [7].Adsorption is recognized as one of the most promising methods because of its high effectiveness, low cost, and popularity [8,9]. Polymeric adsorbents are widely used as materials for the removal of organic or inorganic contaminants from water or air because of their advantages such as high flexibility in the design of structures and properties; chemical stability in harsh environments, including strong acidic, alkaline, salty, and oxidizing solutions; feasible regeneration; and thermal durability [9][10][11]. Polyethylenimine (PEI) has a high amine density and accessible primary amine sites on the chain ends, which act as desirable building blocks for the construction of adsorbents. For instance, many excellent CO 2 adsorbents have been prepared by integrating PEI into porous materials, including silica [12], mesoporous carbon [13], titanate [14], polymeric supports [15], and other metal oxide nanocomposites [16]. In addition, because of the high positive charge density on the protonated PEI backbone or side chains, PEI-based adsorbents exhibit good adsorption capacity for acidic gas or anionic materials such as polyanions and negatively charged organic or inorganic matter, including various anionic dyes [16][17][18][19].Electrospinning is an effective approach to prepare ultrafine fibers; it uses an electrostatic force from an external high-voltage electrical field between a spinneret and a grounded collector to draw very fine (typically micro-to nanoscale) fibers from a liquid droplet [20]. The ultrafine fibers produced by electrospinning have very high specific ABSTRACT We prepared a nanofibrous adsorbent for anionic dye removal from aqueous solution by electrospinning a modified polyethylenimine (m-PEI) and polyvinylidene fluoride (PVDF) blend. The electrospun nanofibrous adsorbent was confirmed to be a nanoscale, porous material with a positively charged surface; these characteristics are quite beneficial for anionic contaminant adsorption. Experimental adsorption of an anionic dye, methyl orange (MO), demonstrates that this adsorbent can rapidly remove MO from aqueous solution; its maximum adsorption capacity was 633.3 mg g −1 , which is much higher than that of previously reported adsorbents. After immersion in a basic solution, the adsorbent was well regenerated and showed good recyclability. The adsorption performance of the nanofibrous adsorbent is greatly influenced by the temperature, initial MO concentration, and pH of the solution. We further found that MO adsorption onto the adsorbent can be described well by the pseudo-second-order kinetic model and Langmuir isotherm model. Weber-Morris plots suggested that the adsorption of MO onto the nanofibrous mat was affected...

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“…40 41 42 43 1. Introduction 44 Dyes with adverse effects on human body [1] applied in textile, 45 dyeing, printing, and related industries led to large amounts of 46 dye-containing wastewater and their subsequent discharge into 47 environment associated with generation of hazards for human 48 health [2,3]. Methyl orange (MO, a water-soluble azo dye in 49 addition to above activities widely used in research laboratories 50 as an acid base indicator [4].…”

mentioning

confidence: 99%

Removal of methyl orange by multiwall carbon nanotube accelerated by ultrasound devise: Optimized experimental design

Ghaedi

Hajati²,

Zaree

et al. 2015

Advanced Powder Technology

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Enhanced adsorption removal of methyl orange from aqueous solution by nanostructured proton-containing δ-MnO₂

Abstract: Two nanostructured proton-containing δ-MnO2 (H-δ-MnO2) materials were synthesized through proton exchange for K-containing δ-MnO2 (K-δ-MnO2) nanosheets and nanoparticles prepared by the hydrothermal homogeneous precipitation method and solid-state reaction.

Cited by 128 publications

References 59 publications

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

Polyethylenimine nanofibrous adsorbent for highly effective removal of anionic dyes from aqueous solution

Removal of methyl orange by multiwall carbon nanotube accelerated by ultrasound devise: Optimized experimental design

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Enhanced adsorption removal of methyl orange from aqueous solution by nanostructured proton-containing δ-MnO2

Abstract: Two nanostructured proton-containing δ-MnO2 (H-δ-MnO2) materials were synthesized through proton exchange for K-containing δ-MnO2 (K-δ-MnO2) nanosheets and nanoparticles prepared by the hydrothermal homogeneous precipitation method and solid-state reaction.

Cited by 128 publications

References 59 publications

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

Adsorptive removal of Pb(II) and Zn(II) from water onto manganese oxide-coated sand: Isotherm, thermodynamic and kinetic studies

Polyethylenimine nanofibrous adsorbent for highly effective removal of anionic dyes from aqueous solution

Removal of methyl orange by multiwall carbon nanotube accelerated by ultrasound devise: Optimized experimental design

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Enhanced adsorption removal of methyl orange from aqueous solution by nanostructured proton-containing δ-MnO₂