Seaweeds for the remediation of wastewaters contaminated with zinc(II) ions

Senthilkumar, R.; Vijayaraghavan, K.; Thilakavathi, M.; Iyer, P.V.R.; Velan, M.

doi:10.1016/j.jhazmat.2006.01.014

Cited by 116 publications

(48 citation statements)

References 27 publications

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“…From this figure the maximum metal sorption capacity can be calculated for each ion as follows: 0.75-0.88 mg Cu(II)/mg calcium silicate, 0.25-0.32 mg Zn(II)/mg calcium silicate and 0.25-0.33 mg Cd(II)/mg calcium silicate. These values are much higher than those measured for other natural and synthetic sorbents 35,36) . , SO 4 = and CrO 4 = used in the test solutions employing as sorbent the same sample of nano-structured calcium silicate used for the sorption of the cations.…”

Section: Adsorption Experimentscontrasting

confidence: 56%

Adsorption of Pollutant Ions From Residual Aqueous Solutions Onto Nano-Structured Calcium Silicate

Valenzuela

Basualto

Sapag

et al. 2013

J. Chil. Chem. Soc.

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The sorption of contaminant ions existing in residual aqueous solutions onto nano-structured calcium silicate has been studied. The sorbent was prepared by chemical reaction between a soluble solution of sodium silicate and calcium hydroxide. X-ray diffraction analysis showed the amorphous character of the obtained calcium silicate, although patterns associated to wollastonite, CaSiO 3 , and larnyta-syn, Ca 2 SiO 4 were detected. The particle mean size was approximate 0.5 to 1.0 µm having an average BET surface area of 333.0 m 2 /g and a mean pore diameter variable between 15.8-23.6 nm. The nano-structured calcium silicates were contacted with industrial residual aqueous solutions containing, among others, Cu(II), Zn(II), Cd(II) and the anions PO 4 3-, SO 4 = and CrO 4 = , being copper (II) and phosphate the ions that were most easily and quantitatively adsorbed. The results of equilibrium experiments showed that the Redlich-Peterson adsorption isotherm model explained the experimental results for some metal ions.The experimental kinetics followed a pseudo-second-order kinetics model for Cu(II) and Zn(II) sorption.

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Section: Adsorption Experimentscontrasting

confidence: 56%

Adsorption of Pollutant Ions From Residual Aqueous Solutions Onto Nano-Structured Calcium Silicate

Valenzuela

Basualto

Sapag

et al. 2013

J. Chil. Chem. Soc.

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“…This model was initially developed for pharmacology studies and recently used to describe adsorption of metals in some cases (Yan et al, 2001;Senthilkumar et al, 2006;Araneda et al, 2011). The modified dose-response model can be written as …”

Section: Modified Dose-response Modelmentioning

confidence: 99%

Mathematically modeling fixed-bed adsorption in aqueous systems

Cai

Pan

2013

J. Zhejiang Univ. Sci. A

345

166

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Adsorption is one of the widely used processes in the chemical industry environmental application. As compared to mathematical models proposed to describe batch adsorption in terms of isotherm and kinetic behavior, insufficient models are available to describe and predict fixed-bed or column adsorption, though the latter one is the main option in practical application. The present review first provides a brief summary on basic concepts and mathematic models to describe the mass transfer and isotherm behavior of batch adsorption, which dominate the column adsorption behavior in nature. Afterwards, the widely used models developed to predict the breakthrough curve, i.e., the general rate models, linear driving force (LDF) model, wave propagation theory model, constant pattern model, Clark model, Thomas model, Bohart-Adams model, Yoon-Nelson model, Wang model, Wolborska model, and modified dose-response model, are briefly introduced from the mechanism and mathematical viewpoint. Their basic characteristics, including the advantages and inherit shortcomings, are also discussed. This review could help those interested in column adsorption to reasonably choose or develop an accurate and convenient model for their study and practical application.

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“…Regeneration without damaging the metal removal capacity of the sorbent is a very important factor in developing novel biosorbents. Senthilkumar et al [8] reported that Zn(II) removal by Utricularia reticulata using a packed column decreased after 3 sorption -desorption cycles using CaCl2 from 64.72% RE for cycle 1 down to 55.19% for cycle 3, probably due to the destruction or morphological alteration of the binding sites on the surface of the biomass [18]. It was also reported by Lau et al [11] that repeated sorption-desorption cycles using H2SO4 on Ulva lactuca in batch tests decreased its removal potential for Cu(II), Ni(II) and Zn(II).…”

Section: Regeneration Of the Sorbent And Metal Re-uptakementioning

confidence: 99%

“…Using seaweed-based sorbents in fixed-bed columns present numerous advantages over conventional wastewater treatment systems, such as an efficient utilization of the biosorbent, low metal concentrations in effluents and the regeneration of the sorbent with metal recovery at low cost [8]. Several studies have concentrated on the screening of suitable desorbing agents for metal recovery [9 -11].…”

Section: Introductionmentioning

confidence: 99%

Regeneration and Reuse of a Seaweed‐Based Biosorbent in Single and Multi‐Metal Systems

Bakir¹,

McLoughlin

Fitzgerald

2010

CLEAN Soil Air Water

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A seaweed-waste material resulting from the processing of Ascophyllum nodosum was previously shown to be very efficient at removing Zn(II), Ni(II) and Al(III) both in single and multi-metal waste streams. In this study, the regeneration of the biosorbent using an acid wash resulted in the release of high metal concentrations during multiple desorption cycles. Maximum desorption efficiencies (DE) of 183, 122 and 91% were achieved for Zn(II), Ni(II) and Al(III), respectively, for subsequent metal loading cycles, significantly exceeding the desorption rates observed for conventional sorbents. The regeneration of the sorbent was accomplished with very little loss in metal removal efficiency (RE) for both single and multi-metal systems. Values of 92, 96 and 94% RE were achieved for Zn(II), Ni(II) and Al(III), respectively, for the 5 th sorption cycle in single metal aqueous solutions. A slight decrease was observed for the same metals in multi-metal systems with maximum REs of 85, 82 and 82% for Zn(II), Ni(II) and Al(III), respectively. This study showed that the novel sorbent derived from a seaweed industrial waste would be suitable for multiple metal sorption cycles without any significant loss in RE.

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Seaweeds for the remediation of wastewaters contaminated with zinc(II) ions

Cited by 116 publications

References 27 publications

Adsorption of Pollutant Ions From Residual Aqueous Solutions Onto Nano-Structured Calcium Silicate

Adsorption of Pollutant Ions From Residual Aqueous Solutions Onto Nano-Structured Calcium Silicate

Mathematically modeling fixed-bed adsorption in aqueous systems

Regeneration and Reuse of a Seaweed‐Based Biosorbent in Single and Multi‐Metal Systems

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