Removal of heavy metals from aqueous solution using platinum nanopartcles/Zeolite-4A

Mehdizadeh, Sofia; Sadjadi, Sodeh; Ahmadi, Seyed Javad; Outokesh, Mohammad

doi:10.1186/2052-336x-12-7

Cited by 49 publications

(25 citation statements)

References 12 publications

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“…At pH 6.8, the functional groups have negative charges, which leads to the electrostatic attraction between positively charged ions, (metal ions), and negatively charged functional groups. 20 Also at higher pHs (pH > 6.8), the percentage of the removal of metal ions was decreased again, because lead and cobalt ions get out of the solution due to formation of hydroxide.…”

Section: Effect Of Phmentioning

confidence: 99%

Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

Khoo

Esmaeili

2018

J Serb Chem Soc

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In this study, CaO was prepared from chicken egg shells. Then, to improve its properties, CaO/Fe 3 O 4 magnetic composite was synthesized and was used for the removal of lead (Pb (II)) and cobalt (Co (II)) ions from aqueous solutions. For this purpose, the effects of several parameters including pH, contact time, temperature, adsorption dosage and initial concentration of ions on the adsorption were studied. The optimum conditions of pH, contact time, temperature, adsorption dosage and initial concentration of Pb and Co ions were determined to be 6, 30 min, 25 °C, 2 g L-1 and 5 mg L-1 , respectively. The best efficiency for the adsorption of lead and cobalt ions was found to be 97.24 and 94.32 %, respectively. To investigate the equilibrium behaviour of adsorbent, Langmuir and Freundlich models were used. Also, pseudo-first order and pseudo-second order kinetic models were applied for the consideration of kinetic behaviours of experimental data. Additionally, the thermodynamic parameters including enthalpy, entropy and Gibbs energy were calculated for the adsorption of these heavy metal ions. The results showed that Freundlich isotherm model and the pseudo-second order kinetic model achieved the best match with the experimental data and the maximum adsorption capacities obtained from the Langmuir model were 227.27 and 217.39 mg g-1 for lead and cobalt, respectively. Also, thermodynamics studies revealed that the adsorption process of lead and cobalt ions using CaO/Fe 3 O 4 was suitable, spontaneous and exothermic.

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Section: Effect Of Phmentioning

confidence: 99%

Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

Khoo

Esmaeili

2018

J Serb Chem Soc

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“…The fast adsorption at the initial stage was probably due to the interaction between Cd(II) ions (adsorbate) in the solution and active sites those available on the Zeolite-A (adsorbent) surface take place. The equilibrium of adsorption occur when all active sites on the surface of Zeolite-A were blocked by Cd(II) ions from solution [27].…”

Section: Effect Of Contact Time and Temperaturesmentioning

confidence: 99%

“…For Langmuir adsorption isotherm models, the monolayer coverage of the adsorption surfaces and assumes that adsorption occurs on a structurally homogeneous adsorbent and the activity for all the adsorption sites was identical. The Freundlich expression is an empirical equation based on a heterogeneous surface [27]. The general form of Langmuir and Freundlich isotherm was assigned as: C e /q e = (1/ k L q m ) + (Ce/ q m ) (Langmuir) (2) lnq e = lnk f + 1/n lnC e (Freundlich) (3) Where q e (mg/g) is the adsorbed amount of metal ions per 1 gm of adsorbent, C e (mg/L) is the equilibrium concentration of metal ions in the solution, q m is the monolayerad sorption capacity (mg/g), K L is the Langmuir constant related to the adsorption intensity, K f is the constants of Freundlich isotherm.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Adsorption of Cadmium Ions onto Zeolite-A prepared from Egyptian Kaolin using Microwave Technique

2016

IJSR

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Zeolite-A has been prepared from Egyptian kaolin to remove divalent cadmium ion from wastewater. The synthesized zeolite was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). A batch technique was employed as a function of temperatures, contact time and pH of the solution. Zeolite-A morphology was observed by SEM analysis, and it showed well-defined crystals slightly different sized crystals of the same cubic shape. Results revealed that the optimum conditions of the adsorption process are: zeolite dose= 0.25g in 25 mL of Cd(II) with contact time of 140 min, 333 K and pH 7.5. Two equations, namely pseudo-first order and pseudo-second order have been used to determine the kinetics of removal process. The collected kinetic data showed that pseudosecond order equations controls the adsorption. Chemisorption process and Langmuir isotherm proved best fitting to the experimental data. The adsorption mechanism was based on cation exchanges of Cd +2 ions present in wastewater and the available Na + ion.

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“…Among these contaminants, heavy metals are more dangerous for the environment [1][2][3]. The presence of heavy metals such as zinc, lead, cadmium, copper, and chromium is of major concern due to their toxicity and non-biodegradability in living organisms [4][5][6]. For example, the presence of lead may damage the hematopoietic system which results in liver, kidney and central brain failure leading to hepati-tis, encephalopathy, anemia [7].…”

Section: Introductionmentioning

confidence: 99%

Combined ozonation and adsorption system for the removal of heavy metals from municipal wastewater: effect of COD removal

Ikhlaq¹,

Aslam²,

Zafar³

et al. 2019

Desalination and Water Treatment

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Heavy metals like copper, chromium, cadmium, lead, and zinc are key contaminants of freshwater reservoirs because of their deadly, non-biodegradable, and persistent nature. The work involves the comparison of various single and combined processes such as ozonation (Ozo), adsorption on activated carbon (AC), adsorption on rice husk (RH), ozonation in the presence of rice husk (Ozo/RH) and ozonation in the presence of activated carbon (Ozo/AC) for the removal of chemical oxygen demand (COD) and heavy metals from the municipal wastewater. Various factors such as adsorbent dose reaction time and synchronizing effect of COD removal on the removal efficiency of heavy metals was studied. The maximum removal of both COD and heavy metals was achieved by ozonation in the presence of activated carbon (Ozo/AC) combined process. The results further reveal that COD removal efficiencies have a positive synchronizing impact on the removal efficiencies of heavy metals. It is therefore concluded that (Ozo/AC) combined process may be used for the removal of heavy metals in wastewater.

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Removal of heavy metals from aqueous solution using platinum nanopartcles/Zeolite-4A

Cited by 49 publications

References 12 publications

Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

Adsorption of Cadmium Ions onto Zeolite-A prepared from Egyptian Kaolin using Microwave Technique

Combined ozonation and adsorption system for the removal of heavy metals from municipal wastewater: effect of COD removal

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