Adsorption kinetics and equilibrium isotherms of cadmium removal from wastewater using Chlamydomonas reinhardtii immobilized in sodium alginate

Utilization of agricultural and industrial wastes for metal removal from aqueous solutions In this study a possibility of obtaining sorbents from basketry wastes has been investigated. Therefore, adsorption of cadmium ions on wicker bark of Salix americana has been studied. The obtained experimental results were described by the Freundlich equation and adsorption kinetics by the pseudo-second order equation. The effect of pH on cadmium ions adsorption by S. americana was also investigated. It has been found that for the pH values ranging from 2 to 7 cadmium removal from the solution was held at almost constant level.

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Amino-Functionalized Multi-Walled Carbon Nanotubes as Novel Adsorbents for Selective Adsorption of Anionic Dyes in Aqueous Solution

NANO ◽

10.1142/s1793292015500654 ◽

2015 ◽

Vol 10 (05) ◽

pp. 1550065 ◽

Cited By ~ 3

Author(s):

Hui Huang ◽

Jingang Yu ◽

Wei Liu ◽

Xinyu Jiang

Keyword(s):

Carbon Nanotubes ◽

Aqueous Solution ◽

Adsorption Kinetics ◽

Organic Dyes ◽

Selective Adsorption ◽

Order Kinetic ◽

Equilibrium Isotherms ◽

Anionic Dyes ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

In this study, amino-functionalized multi-walled carbon nanotubes ( MWCNTs - NH 2) were successfully synthesized via an improved method and used for removal of organic dyes in aqueous solution. The synthesized MWCNTs - NH 2 were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscope (SEM), etc. The adsorption capacity and selectivity of MWCNTs - NH 2 for organic dyes was evaluated using rhodamine B ( RhB ), malachite green (MG), methyl orange (MO) and congo red (CR) as models. The selective adsorption toward anionic dyes was found for the MWCNTs - NH 2, and MO was selected as a typical anionic dye to deeply investigate the adsorption kinetics, equilibrium isotherms and thermodynamic parameters of the adsorption process. The adsorption kinetics and equilibrium isotherms data fitted well with the pseudo-second-order kinetic equation and Langmuir isotherm model. The thermodynamics study revealed that the adsorption of MO onto MWCNTs - NH 2 was spontaneous, exothermic and physisorptive in nature. The results indicated that MWCNTs - NH 2 are promising nanomaterials for removal of anionic dyes from industrial wastewater.

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Kinetics and Thermodynamics of Sodium Alginate/Hydroxyapatite Composite Adsorption Fiber for Cd(II) Adsorping

Materials Science Forum ◽

10.4028/www.scientific.net/msf.743-744.578 ◽

2013 ◽

Vol 743-744 ◽

pp. 578-583 ◽

Cited By ~ 1

Author(s):

Zhi Yun Song ◽

Wang Xiao ◽

Jun Hao ◽

Yong Zhu Cui ◽

Li Hua Lv ◽

...

Keyword(s):

Sodium Alginate ◽

Adsorption Kinetics ◽

Ph Value ◽

Freundlich Isotherm ◽

High Concentration ◽

Kinetics And Thermodynamics ◽

Hydroxyapatite Composite ◽

Effects Of Ph ◽

Pseudo Second Order ◽

Physical And Chemical

In this study, kinetics and thermodynamics of sodium alginate/ hydroxyapatite composite adsorption fiber for adsorping Cd () were studied. The morphology and structure were characterized by SEM and IR, and the effects of pH value and bath ratio on Cd () adsorption were discussed. The model of adsorption kinetics and thermodynamics were simulated, and the parameters were calculated. The results showed that the sodium alginate/hydroxyapatite composite adsorption fiber possessed good adsorption ability towards Cd (). The optimum adsorption was found at the pH value of 6-7. High removal percent of more than 90% at low concentration and high concentration of Cd () was obtained at the bath ratio of 1:100 and 1:1000, respectively. The adsorption kinetics and thermodynamics studies showed that the pseudo-second-order model and Freundlich isotherm described the adsorption behaviors well. The thermodynamic parameters indicated that the adsorption of Cd () onto sodium alginate/hydroxyapatite composite adsorption fiber was physical and chemical sorption, endothermic in nature.

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