A study on nickel hydroxide crystallization characteristics

Lee, Chang-Hwan; Lee, Choul-Ho

doi:10.1007/bf02705787

Cited by 14 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the pH is increased, more negatively charged surface became available which facilitated greater Ni(II) uptake on the surface of CLS and CLSC. The decrease in adsorption efficiency at higher pH (> 8.0) was due to the formation of soluble hydroxylated complexes of Ni(II) ions and their competition with the active sites and as a result the retention would decrease again [23]. The results obtained from the present study are in accordance with the earlier study related to the effect of solution pH on metal adsorption process by low-cost adsorbent [22,24,25].…”

Section: Effect Of Phsupporting

confidence: 90%

“…The pH value affects the surface charge of the adsorbent, the degree of ionization, and speciation of the adsorbate during the adsorption process [22]. The decrease in adsorption efficiency at higher pH (> 8.0) was due to the formation of soluble hydroxylated complexes of Ni(II) ions and their competition with the active sites and as a result the retention would decrease again [23]. From Figure 4b, it could be observed that the adsorption increases with increase in pH and attains maximum removal of 37% at pH of 4.0-6.0 for CLS and 99% over the pH range at 4.0-8.0 for CLSC, respectively.…”

Section: Effect Of Phmentioning

confidence: 99%

See 1 more Smart Citation

Isotherm, kinetic, and thermodynamic studies on Ni(II) removal from aqueous solution by Citrus limettioides seed and its carbon derivative

Ramasamy¹,

Srinivasan²

2015

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Activated carbon was prepared from Citrus limettioides seed (CLSC), a novel waste material by chemical modification with sulfuric acid was applied for the adsorption Ni(II) from aqueous solutions. The effect of contact time, pH, adsorbent dose, initial metal ion concentration, and temperature were studied in batch experiments. According to the experimental results, the equilibrium time, optimum pH range, and adsorbent dosage were found to be 3 h, pH = 4.0–8.0 and 1 g L−1, respectively. In addition, raw Citrus limettioides seeds (CLS) were used as adsorbents at the same parameters. Ni(II) removal for CLSC and CLS were obtained 99.00% and 37.00% in turn. The equilibrium data agreed well with Langmuir model, which confirmed the monolayer coverage of Ni(II) ions onto CLS and CLSC. The Langmuir monolayer adsorption capacity of the CLSC was found to be 36.06 mg g−1 which was significantly about 3.5 times greater than that of CLS (10.23 mg g−1) at 300 K. The kinetic data followed pseudo‐second order model and intra‐particle diffusion was not the sole rate‐controlling factor. Surface morphology and structural analysis of CLSC prior to and after adsorption were characterized by SEM and EDX. The presence of hydroxyl, carboxylic, and sulfonic acid groups are confirmed by FTIR spectra. The adsorbents were also tested for the removal of Ni(II) from electroplating wastewater in connection with the reuse and selectivity of the adsorbents. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1384–1395, 2015

show abstract

Section: Effect Of Phsupporting

confidence: 90%

Section: Effect Of Phmentioning

confidence: 99%

Isotherm, kinetic, and thermodynamic studies on Ni(II) removal from aqueous solution by Citrus limettioides seed and its carbon derivative

Ramasamy¹,

Srinivasan²

2015

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…(2015) 12:3993-4004 3997 increased, more negatively charged surface became available which facilitated greater Ni(II) uptake on the surface of CLP and CLPC. The decrease in adsorption efficiency at higher pH ([8.0) was due to the formation of soluble hydroxylated complexes of nickel ions and their competition with the active sites; as a result, the retention would decrease again (Lee and Lee 2005). The results obtained from the present study are in accordance with the earlier study related to the effect of solution pH on metal adsorption process by low-cost adsorbent (Ugurlu et al 2009;Prasad and Abdullah 2009;Shroff and Vaidya 2011).…”

Section: Effects Of the Contact Time On Sorptionsupporting

confidence: 90%

Nickel (II) removal using modified Citrus limettioides peel

Ramasamy

Srinivasan

2015

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

The Ni(II) adsorption capacity of carbon derived from Citrus limettioides peel (CLP), which is a novel waste material (CLPC), was evaluated regarding contact time, pH and adsorbent dose during batch adsorption processes with raw CLP. The optimal contact time for the adsorption of Ni(II) ions onto the peel and peel carbon was 3 h, and the optimal pH ranged from 5.0 to 8.0 for CLP and 4.0-8.0 for CLPC, respectively. The removal percentage decreased from 85.0 to 70.0 % for CLP and remained nearly constant (99 %) for CLPC when the initial Ni(II) concentration was increased from 10 to 50 mg L -1 . The equilibrium data fit the Langmuir isotherm with a high R 2 value, indicating that the Ni(II) ions formed a homogenous monolayer on the adsorbent surface. Adsorption capacity of Ni(II) ions on peel (CLP) and peel carbon (CLPC) was found to be 25.64 and 38.46 mg g -1 , respectively. The surface morphology and functionality of the CLP and CLPC before and after adsorption were characterized using SEM, EDX and FT-IR. Various thermodynamic parameters, including the standard Gibbs free energy (DG°), standard enthalpy (DH°) and standard entropy (DS°), were evaluated. The CLP and CLPC were tested with Ni(II) plating wastewater through a batch-mode process over five cycles; CLPC showed better results than CLP.

show abstract

“…Figure 2 shows the kinetic profiles of Ni(II) biosorption by APSH at different pH values ranging from 3.0 to 7.0. Higher pH values were not assayed because Ni(II) ions start to precipitate at a pH value of about 8.0 (Lee and Lee 2005); thus, under these pH It was found that at the different pH values tested, the Ni(II) biosorption capacity of APSH increased as the experimental time increased, until it reached a maximum constant value, which corresponded to the biosorption equilibrium. Furthermore, Ni(II) biosorption onto APSH was strongly affected by solution pH values.…”

Section: Effect Of Solution Ph On Ni(ii) Biosorption Kineticsmentioning

confidence: 93%

Nickel(II) biosorption from aqueous solutions by shrimp head biomass

Hernández-Estévez

Cristiani‐Urbina

2014

Environ Monit Assess

View full text Add to dashboard Cite

The present study evaluates the capacity of shrimp (Farfantepenaeus aztecus) head to remove toxic Ni(II) ions from aqueous solutions. Relevant parameters that could affect the biosorption process, such as shrimp head pretreatment, solution pH level, contact time and initial Ni(II) concentration, were studied in batch systems. An increase in Ni(II) biosorption capacity and a reduction in the time required to reach Ni(II) biosorption equilibrium was manifested by shrimp head biomass pretreated by boiling in 0.5 N NaOH for 15 min; this biomass was thereafter denominated APSH. The optimum biosorption level of Ni(II) ions onto APSH was observed at pH 7.0. Biosorption increased significantly with rising initial Ni(II) concentration. In terms of biosorption dynamics, the pseudo-second-order kinetic model described Ni(II) biosorption onto APSH best. The equilibrium data adequately fitted the Langmuir isotherm model within the studied Ni(II) ion concentration range. According to this isotherm model, the maximum Ni(II) biosorption capacity of APSH was 104.22 mg/g. Results indicate that APSH could be used as a low-cost, environmentally friendly, and promising biosorbent with high biosorption capacity to remove Ni(II) from aqueous solutions.

show abstract

A study on nickel hydroxide crystallization characteristics

Cited by 14 publications

References 2 publications

Isotherm, kinetic, and thermodynamic studies on Ni(II) removal from aqueous solution by Citrus limettioides seed and its carbon derivative

Isotherm, kinetic, and thermodynamic studies on Ni(II) removal from aqueous solution by Citrus limettioides seed and its carbon derivative

Nickel (II) removal using modified Citrus limettioides peel

Nickel(II) biosorption from aqueous solutions by shrimp head biomass

Contact Info

Product

Resources

About