Removal of lead from aqueous solution by activated carbon prepared from Enteromorpha prolifera by zinc chloride activation

Li, Yanhui; Du, Qiuju; Wang, Xiaodong; Zhang, Pan; Wang, Dechang; Wang, Zonghua; Xia, Yanzhi

doi:10.1016/j.jhazmat.2010.07.063

Cited by 205 publications

(77 citation statements)

References 50 publications

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“…Figure 3 also demonstrates that Pb 2+ adsorption capacity decreases as adsorbent concentration increases. This reveals that more active sites are utilized at lower adsorbent concentration, producing a higher adsorption capacity, while only part of active sites are occupied by Pb 2+ at higher adsorbent concentration, leading to a lower adsorption capacity [21]. We also note that adsorption of Pb 2+ in aqueous solutions is related to S BET and V T of adsorbent [22].…”

Section: Effect Of Adsorbent Concentration On Pbmentioning

confidence: 68%

“…In order to assess the performance of coconut shell carbons as adsorbent for Pb 2+ removal, a comparison with other types of adsorbents reported in the literature is carried out ( Table 2). The adsorption capacity of CSC-A and CSC-B is roughly 112.36 mg/g and 151.52 mg/g, respectively [21], demonstrating great predominance respect to other adsorbents, which suggests that they are promising adsorbents to remove heavy metals from aqueous solutions. …”

Section: Adsorption Isothermmentioning

confidence: 99%

“…The initial fast adsorption may be attributed to large uncovered surface area of coconut shell carbons. With further increasing agitation time, the availability of the uncovered surface area gradually diminishes, and adsorption equilibrium is established [21,23]. Moreover, S BET and V T of the adsorbent have great influence on the time of adsorption equilibrium.…”

Section: Effect Of Adsorbent Concentration On Pbmentioning

confidence: 99%

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Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

et al. 2013

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Abstract:Removal of Pb 2+ from aqueous solutions using coconut shell carbons produced by KOH activation is performed in this paper. Morphology and pore structure characteristic of coconut shell carbons are analyzed by SEM and nitrogen adsorption techniques. Effects of adsorbent concentration, agitation time and initial ion concentration on the adsorption behavior are investigated, and adsorption isotherm and kinetics on coconut shell carbons are also studied. The results show that high weight ratio of KOH/sample is favorable to produce rich porous structure. The resultant coconut shell carbons with a high specific surface area of 1135 m 2 /g is obtained and demonstrates good adsorption potential on removal of Pb 2+ from aqueous solutions. Adsorption data fit well with Freundlich and Halsey isotherms. The kinetic studies indicate that adsorption behavior can be described by pseudo-second-order kinetic model, which also follows external diffusion and intra-particle diffusion in the adsorption process.

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Section: Effect Of Adsorbent Concentration On Pbmentioning

confidence: 68%

Section: Adsorption Isothermmentioning

confidence: 99%

Section: Effect Of Adsorbent Concentration On Pbmentioning

confidence: 99%

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Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

et al. 2013

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“…The high biosorption rate at initial contact time could be related to the high concentration gradient of solute [38], as well as abundance of vacant active sites on the algal surface [39,40]. Afterward, the slow removal capacity during the later stages may be attributed to diffusion of metal ions into algal surface [41], as well as difficulty of occupation of the remaining binding sites due to forces between the solute molecules of the solid and bulk phases [42,43].…”

Section: Optimization Of Heavy Metals Biosorptionmentioning

confidence: 99%

Comparative Study for Biosorption of Heavy Metals from Synthetic Wastewater by Different Types of Marine Algae

Ibrahim¹,

Aziz²,

Hamdy³

et al. 2018

J Bioremediat Biodegrad

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Pollution by heavy metal ions is one of the major environmental problems in many countries. In this study, four different species of dried marine macroalgae, Ulva lactuca, Jania rubens, Pterocladia capillacea and Colpomenia sinosa were used for the removal of toxic heavy metal ions Pb +2 , Cd +2 and Ni +2 from synthetic wastewater. In general, the highest efficiency of metal ion bioremoval was recorded for red alga J. rubens followed by C. sinosa and the lowest one was recorded for U. lactuca, with mean removal values of 91%, 89% and 85%, respectively. The effect of several parameters such as contact time, algal dose, effect of pH, and initial concentration of metal ions on the adsorption process was estimated. The optimum adsorption was found to occur at pH 5.0, contact time 60 min, adsorbent dose 20 g/L and initial concentration 40 mg/L. This work confirms the potential use of red macroalga J. rubens as an inexpensive and efficient alternative technology, for sequestering heavy metal ions from wastewater.

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“…These results indicate that the reaction rate is proportional to the number of the active sites present on the adsorbent surface. It is known that adsorption in batch systems is affected by both surface or pore diffusion (Mohan et al, 2007;Li et al, 2010). Additional modeling is required to define which diffusion type is the rate limiting step (Hui et al, 2003).…”

Section: Figure 1 | Xrd Patterns Of Biochars Modified With 1m Koh (Pimentioning

confidence: 99%

Morphology of Modified Biochar and Its Potential for Phenol Removal from Aqueous Solutions

Komnitsas

Zaharaki

2016

Front. Environ. Sci.

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In the present study, the efficiency of phenol removal from synthetic aqueous solutions by chemically modified biochar with the use of 1M KOH or 1M FeCl 3 was investigated. Initially, biochar was produced after slow pyrolysis of three different agricultural wastes, namely pistachio (Pistacia vera L.) shells, pecan (Carya illinoinensis) shells, and wood sawdust. The quality of biochar was assessed by evaluating its main properties, such as pH, surface area, porosity and C content. X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR) were used for the identification of biochar's structure. The efficiency of phenol removal from synthetic solutions was assessed with the use of kinetic and equilibrium experiments. The experimental results show that the KOH-modified biochar exhibited the highest phenol removal efficiency. Hydrophobic sorption on its surface is the main phenol removal mechanism. The pseudo-second order model fits best the kinetic data, while the Freundlich model, as deduced from an equilibrium study describes very well sorption of phenols on all biochars examined.

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Removal of lead from aqueous solution by activated carbon prepared from Enteromorpha prolifera by zinc chloride activation

Cited by 205 publications

References 50 publications

Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

Comparative Study for Biosorption of Heavy Metals from Synthetic Wastewater by Different Types of Marine Algae

Morphology of Modified Biochar and Its Potential for Phenol Removal from Aqueous Solutions

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