Characteristics of lead removal by crab shell particles

Lee, Moo Yeal; Lee, Sung Ho; Shin, Hyun Jae; Kajiuchi, Toshio; Yang, Ji Won

doi:10.1016/s0032-9592(98)00043-0

Cited by 26 publications

(12 citation statements)

References 6 publications

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“…In this uptake system, the carbonate ion, the acetamido groups of chitin in crab shell, and cadmium ion may change their species with the changes in solution acidity ( Figure S1). For the carbonate ion, its species can be defined in three pH ranges: ,6.3, 6.3~10.3 and .10.3 due to its pK 1 ¼ 6.3 and pK 2 ¼ 10.3, where H 2 CO 3 , HCO À 3 and CO 2À 3 ions are predominant species, respectively (Lee et al, 1998). For the initial pH values of 3.0, 4.0 and 5.5, the CO 2À 3 ion dissolved from the calcium carbonate in crab shell (eq 3) will be hydrolyzed to release the OH À ion (eq 4), leading to a fast increase in solution pH within 60 min ( Figure 1b).…”

Section: Resultsmentioning

confidence: 99%

“…Crab shell is biological complex composed mainly of biopolymer chitin and proteins as well as bio-mineral calcium carbonate and is expected to exhibit high sorption performance for separation of heavy metal ions in water in a wide concentration range. In fact, raw and acid-washed crab shell particles have already been used to sequester Pb, Cu, Ni and As ions from water (Vijayaraghavan et al, 2006;Kim et al, 2001;Pradhan, et al, 2005, Niu et al, 2007Lee et al, 1998). Kim's group has reported the possibility of crab shell as a biosorbent for removal of Cd(II) ions from a dilute solution (0.5 mmol/ L) , and examined the inhibition effect of Pb (II) and Cr(III) on this uptake (Kim et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Uptake of Cd(II) Onto Raw Crab Shells: Isotherm, Kinetic, Adsorption Properties And Mechanisms

Zhou

Gong

Zhang

et al. 2017

Water Environment Research

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This study focuses on the uptake of cadmium (Cd(II)) ion from water onto raw crab shells acting as a biosorbent. Experimental data were perfectly fitted to the Langmuir and Dubinin-Radushkevich models, while the uptake kinetics are well-described using the pseudo-second-order model. The effects of experimental conditions on the uptake isotherms and kinetics are discussed in detail. A study of uptake thermodynamics has indicated that the Cd(II) uptake onto the crab shell is an endothermic and spontaneous process. For further understanding of this process, possible mechanisms of Cd(II) uptake onto crab shell have been deduced from experimental results. Desorption experiment shows that 93.7% of adsorbed Cd(II) could be recovered with a 0.1 M HNO3 solution. The inhibitory effects of other metal co-ions on the Cd(II) uptake on the crab shell are also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Uptake of Cd(II) Onto Raw Crab Shells: Isotherm, Kinetic, Adsorption Properties And Mechanisms

Zhou

Gong

Zhang

et al. 2017

Water Environment Research

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“…Crab shells can be obtained readily as waste at low or no cost from seafood industries since 1.5 million tons of crabs are consumed every year, generating about 0.5 million tons of shells. In recent years, a few investigators have reported that crab shell showed excellent ability for the removal of different metal ions including lead from water (Lee et al, 1998;Lee et al, 1997). Very recently, Vijayaraghavan et al (2011) utilized acid-washed crab shells to remove Zn(II) ion from aqueous solution and also identified the major removal mechanism as micro-precipitation of metal carbonate.…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb(II) and Zn(II) from Aqueous Solutions by Raw Crab Shell: A Comparative Study

Zhou

Gong

Han

et al. 2016

Water Environment Research

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Removals of Pb(II) and Zn(II) ions from water using crab (Clistocoeloma sinensis) shell particles as biosorbent have been compared in this study. Uptake equilibriums for two ions well described by Langmuir isotherm revealed that crab shell possessed higher uptake capacity for Pb(II) (709 mg/g) than that for Zn(II) (117 mg/g). Kinetics data for the uptake of the two metals were successfully modeled using the pseudo-second-order model, where the initial uptake rate of Pb(II) was much faster than that of Zn(II). Dubinin-Radushkevick modeling and thermodynamic parameters hinted at different uptake mechanisms of Pb(II) and Zn(II) removal by crab shell, attested by FTIR, XRD, FESEM analysis. Pb(II) ion was removed mainly through the chemical reaction, while the uptake of Zn(II) ion onto crab shell was attributed to the chelation and coordination interactions. The polluted river water and laboratory wastewater both satisfied the standards for drinking and irrigation/fishery water, respectively, after being treated with crab shell particles.

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“…One such biosorbent is crab shell waste, obtained from seafood industries. Due to its high calcium carbonate, chitin and protein contents, crab shell performed well in sorption of several heavy metal ions and metalloids, including lead [11], cadmium [12], chromium [13], copper [14], cobalt [14], nickel [15], zinc [16] and arsenic [17]. A very good mechanical stability and ease in desorption enabled the biosorbent to be reused and regenerated up to 5 cycles [15].…”

Section: Introductionmentioning

confidence: 99%