Purification of metal finishing waste waters with zeolites and activated carbons

Leinonen, Heikki; Lehto, Jukka

doi:10.1177/0734242x0101900106

Cited by 61 publications

(28 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Temperature, pH, zeolite concentration and initial metal concentration are the major parameters that are considered to have an effect on the removal of heavy metals. Several studies report the superior heavy metal sorption capacities for zeolites with low Si:Al ratios [38,[41][42][43]. The prominent role played by Si:Al ratio on the sorption of heavy metals has been demonstrated in the study of Leinonen and Lehto [42].…”

Section: Structure Of Zeolitementioning

confidence: 95%

“…Several studies report the superior heavy metal sorption capacities for zeolites with low Si:Al ratios [38,[41][42][43]. The prominent role played by Si:Al ratio on the sorption of heavy metals has been demonstrated in the study of Leinonen and Lehto [42]. They investigated the uptake of Zn, Ni, Cd, Cu and Co cations using zeolites having the same framework structure, but different Si:Al ratios.…”

Section: Structure Of Zeolitementioning

confidence: 99%

See 1 more Smart Citation

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Ziyath¹,

Mahbub²,

Goonetilleke³

et al. 2011

JWARP

View full text Add to dashboard Cite

Zeolite-based technology can provide a cost effective solution for stormwater treatment for the removal of toxic heavy metals under increasing demand of safe water from alternative sources. This paper reviews the currently available knowledge relating to the effect of properties of zeolites such as pore size, surface area and Si:Al ratio and the physico-chemical conditions of the system such as pH, temperature, initial metal concentration and zeolite concentration on heavy metal removal performance. The primary aims are, to consolidate available knowledge and identify knowledge gaps. It was established that an in-depth understanding of operational issues such as, diffusion of metal ions into the zeolite pore structure, pore clogging, zeolite surface coverage by particulates in stormwater as well as the effect of pH on stormwater quality in the presence of zeolites is essential for developing a zeolite-based technology for the treatment of polluted stormwater. The optimum zeolite concentration to treat typical volumes of stormwater and initial heavy metal concentrations in stormwater should also be considered as operational issues in this regard. Additionally, leaching of aluminium and sodium ions from the zeolite structure to solution were identified as key issues requiring further research in the effort to develop cost effective solutions for the removal of heavy metals from stormwater.

show abstract

Section: Structure Of Zeolitementioning

confidence: 95%

Section: Structure Of Zeolitementioning

confidence: 99%

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Ziyath¹,

Mahbub²,

Goonetilleke³

et al. 2011

JWARP

View full text Add to dashboard Cite

show abstract

“…Zeolites, in general, are weakly acidic in nature and therefore sodium form exchangers are selective for protons (RNa + H 2 O ⇔ RH + Na + + OH − ). This leads to high pH values when the exchanger is equilibrated with a relatively dilute electrolyte solution [26], making feasible the metal hydroxide precipitation. The crystal structure of zeolite 4A contains large cages having a near spherical shape and free diameter of 11.4 Å.…”

Section: Copper Adsorption Isothermsmentioning

confidence: 99%

Comparative Study of Copper Adsorptivity and Selectivity toward Zeolites

Kabwadza-Corner¹,

Munthali²,

Johan³

et al. 2014

AJAC

View full text Add to dashboard Cite

The objectives of the study were to find the type and species of zeolite which gives optimum adsorption of copper, provide an explanation of the mechanism involved in the adsorption process and establish the selectivity sequence among zeolites. Adsorption of Cu onto zeolites and montmorillonite as a reference was conducted at an initial Cu concentration range of 0 -0.60 mM in the presence of 100 mM NH 4 NO 3 at initial pH of 5. Langmuir and Freundlich models were used in analyzing the equilibrium data and a selectivity sequence derived from the Langmuir calculation was A4 > faujasite X > modernite > Na-P1 ≈ montmorillonite ≈ faujasite Y > clinoptilolite. Zeolites A4 and faujasite X had high adsorptive capacities of 1429 mmol·kg −1 and 909 mmol·kg −1 , respectively. Zeolite A4 has the highest CEC among all the samples (6150 mmol·kg −1 ), and the adsorption capacity of Cu was largely influenced by the CEC of the samples. The adsorption mechanism was based on the exchange of Cu from solution with mostly Na which was the main exchangeable cation available. These results are important in selecting the most effective and suitable adsorbent for Cu removal from polluted environments.

show abstract

“…The pseudo-firstorder (Leinonen and Letho 2001) and pseudo-second-order (Ho and Mckay 1999) rate equations are as follows:…”

Section: Kinetic Studiesmentioning

confidence: 99%

Adsorption of Ag+ ions on hydrolyzed lignocellulosic materials based on willow, paulownia, wheat straw and maize stalks

Vassileva

Radoykova

Detcheva

et al. 2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

In the present work, the adsorption of Ag ? ions on hydrolyzed plant biomass (willow, paulownia, wheat straw and maize stalks) was investigated. Chemical analyses were performed to establish the composition of the obtained materials. Adsorption mechanism, adsorption sites and specific surface areas of these materials were examined by BET analysis, IR spectroscopy, XPS and EPR. The effects of contact time, acidity of initial solutions and Ag ? ion concentrations were followed. Pseudo-firstorder, pseudo-second-order and intra-particle diffusion models were used to analyze kinetic data. In all cases, the adsorption was significantly affected by the pH value. Different types of adsorption isotherms of Ag ? ions (either Langmuir or Freundlich) were registered depending on the adsorbing material. The adsorption mechanism is complex, and the process passes through different stages as clustering of Ag ? ions and formation of elemental Ag. The maximal adsorption capacities varied from 2.05 to 6.07 mg g -1 . The obtained results revealed that the examined waste lignocellulosic materials are promising adsorbents for Ag ? ions.

show abstract

Purification of metal finishing waste waters with zeolites and activated carbons

Cited by 61 publications

References 4 publications

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Comparative Study of Copper Adsorptivity and Selectivity toward Zeolites

Adsorption of Ag+ ions on hydrolyzed lignocellulosic materials based on willow, paulownia, wheat straw and maize stalks

Contact Info

Product

Resources

About