Removal of copper(II) ions by a biosorbent—Cinnamomum camphora leaves powder

Chen, Hao; Dai, Guoliang; Zhao, Jie; Zhong, Aiguo; Wu, Junyong; Yan, Hua

doi:10.1016/j.jhazmat.2009.12.022

Cited by 220 publications

(118 citation statements)

References 45 publications

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“…The values of ΔG became more negative with the increase in temperature, indicating that the adsorption processes would be more favorable at high temperature. The similar results are found in the studies of Wang and Qin [33], Rakhshaee et al [34], Xie et al [35]and Yin et al [36], The positive values of ΔS showed the affinity of SA or CSA for Cu 2+ ions increased the disorder at the solid/liquid interface during the adsorption process. Generally, the change in free energy for physical adsorption is between −20 kJ/mol and 0, and that for chemical adsorption is between −80 and −400 kJ/mol [37].…”

Section: Thermodynamics Of the Adsorptionsupporting

confidence: 88%

Adsorption Properties of Copper (II) Ion From Aqueous Solution by Starch-Grafted Polyacrylamide and Crosslinked Starch-Grafted Polyacrylamide

Tan

Wei

Ouyang³

et al. 2014

Period. Polytech. Chem. Eng.

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Section: Thermodynamics Of the Adsorptionsupporting

confidence: 88%

Adsorption Properties of Copper (II) Ion From Aqueous Solution by Starch-Grafted Polyacrylamide and Crosslinked Starch-Grafted Polyacrylamide

Tan

Wei

Ouyang³

et al. 2014

Period. Polytech. Chem. Eng.

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“…It is also found that k 2 decreases with increasing initial MO concentration. This is attributed to the fact that the number of surface active sites on the nanofibrous mat is well in excess of the number of MO molecules at lower concentrations, and when the MO concentration is increased, the competition for surface active sites is increased, resulting in lower adsorption rates [48].…”

Section: Adsorption Kineticsmentioning

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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“…When one mole of ions is transferred to the adsorbent surface, its value is less than 8 kJ mol -1 which indicates the physical adsorption (Kundu and Gupta 2006). If the value of E is between 8 and 16 kJ mol -1 , it indicates the adsorption process follows ion exchange (Senthil kumar et al 2011a) and when its value in the range of 20-40 kJ mol -1 , it indicates chemisorptions (Chen et al 2010).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Nickel (II) removal using modified Citrus limettioides peel

Ramasamy

Srinivasan

2015

Int. J. Environ. Sci. Technol.

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The Ni(II) adsorption capacity of carbon derived from Citrus limettioides peel (CLP), which is a novel waste material (CLPC), was evaluated regarding contact time, pH and adsorbent dose during batch adsorption processes with raw CLP. The optimal contact time for the adsorption of Ni(II) ions onto the peel and peel carbon was 3 h, and the optimal pH ranged from 5.0 to 8.0 for CLP and 4.0-8.0 for CLPC, respectively. The removal percentage decreased from 85.0 to 70.0 % for CLP and remained nearly constant (99 %) for CLPC when the initial Ni(II) concentration was increased from 10 to 50 mg L -1 . The equilibrium data fit the Langmuir isotherm with a high R 2 value, indicating that the Ni(II) ions formed a homogenous monolayer on the adsorbent surface. Adsorption capacity of Ni(II) ions on peel (CLP) and peel carbon (CLPC) was found to be 25.64 and 38.46 mg g -1 , respectively. The surface morphology and functionality of the CLP and CLPC before and after adsorption were characterized using SEM, EDX and FT-IR. Various thermodynamic parameters, including the standard Gibbs free energy (DG°), standard enthalpy (DH°) and standard entropy (DS°), were evaluated. The CLP and CLPC were tested with Ni(II) plating wastewater through a batch-mode process over five cycles; CLPC showed better results than CLP.

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Removal of copper(II) ions by a biosorbent—Cinnamomum camphora leaves powder

Cited by 220 publications

References 45 publications

Adsorption Properties of Copper (II) Ion From Aqueous Solution by Starch-Grafted Polyacrylamide and Crosslinked Starch-Grafted Polyacrylamide

Adsorption Properties of Copper (II) Ion From Aqueous Solution by Starch-Grafted Polyacrylamide and Crosslinked Starch-Grafted Polyacrylamide

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

Nickel (II) removal using modified Citrus limettioides peel

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