Lead removal from aqueous solutions by natural Greek bentonites

Bourliva, Anna; Michailidis, Kleopas; Sikalidis, C.; Filippidis, Anestis; Betsiou, M.

doi:10.1180/claymin.2013.048.5.09

Cited by 26 publications

(21 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The linear form of Freundlich equation can be expressed as [34]

\begin{matrix} T1 \\ \ln (q_{e}) = \ln (K_{F}) + \frac{1}{n} \ln (C_{e}), \end{matrix}

where q e and C e are the same as defined above and K F and n are the Freundlich constants, which indicate the adsorption capacity and adsorption intensity of a given material, respectively. The n values between 1 and 10 indicate favorable adsorption [35]. …”

Section: Resultsmentioning

confidence: 99%

Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash

Zheng

Cui

et al. 2017

Bioinorganic Chemistry and Applications

View full text Add to dashboard Cite

Natural biomass ash of agricultural residuals was collected from a power plant and modified with hexagonal mesoporous silica and functionalized with 3-aminopropyltriethoxysilane. The physicochemical and morphological properties of the biomass ash were analyzed by ICP-OES, SEM, TEM-EDS, FTIR, and BET analysis. The adsorption behavior of the modified product for Cd2+ in aqueous solution was studied as a function of pH, initial metal concentration, equilibrium time, and temperature. Results showed that the specific surface area of the modified product was 9 times that of the natural biomass ash. The modified biomass ash exhibited high affinity for Cd2+ and its adsorption capacity increased sharply with increasing pH from 4.0 to 6.0. The maximum adsorption capacity was 23.95 mg/g in a pH 5 solution with an initial metal concentration of 50 mg/L and a contact time of 90 min. The adsorption of Cd2+ onto the modified biomass ash was well fitted to the Langmuir model and it followed pseudo-second-order kinetics. Thermodynamic analysis results showed that the adsorption of Cd2+ was spontaneous and endothermic in nature. The results suggest that the modified biomass ash is promising for use as an inexpensive and effective adsorbent for Cd2+ removal from aqueous solution.

show abstract

“…The linear form of Freundlich equation can be expressed as [34]

\begin{matrix} T1 \\ \ln (q_{e}) = \ln (K_{F}) + \frac{1}{n} \ln (C_{e}), \end{matrix}

Section: Resultsmentioning

confidence: 99%

Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash

Zheng

Cui

et al. 2017

Bioinorganic Chemistry and Applications

View full text Add to dashboard Cite

show abstract

“…The main involved mechanisms were cation exchange and complexation with the active groups of the biomasses' constituents. Furthermore, the efficiency of some raw and modified inorganic materials for lead removal from aqueous solutions has been tested, such as natural zeolite (Calvo et al 2009); raw illitic clays (Ozdes et al 2011), palygorskite (Fan et al 2009;Sheikhhosseini et al 2013); sepiolite (Sheikhhosseini et al 2013), dolomite (Irani et al 2011), ore mine tailings wastes (Venalainen 2012), natural Greek bentonites (Bourliva et al 2013) and modified attapulgite (Deng et al 2013). The suggested corresponding mechanisms were adsorption by complex formation with hydroxyl groups as well as cation exchange.…”

Section: Introductionmentioning

confidence: 99%

Study of continuous lead removal from aqueous solutions by marble wastes: efficiencies and mechanisms

Mlayah

Jellali

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Lead removal from synthetic solutions and real wastewater by Bianco Gioia marble wastes as abundant, renewable and eco-friendly materials was studied under different experimental conditions in a continuous stirring tank reactor. These marble wastes were found to be very efficient in removing lead for several experimental situations. Indeed, for initial aqueous pH values higher than 3.6, a lead removal efficiency of about 100 % was achieved even for high aqueous concentrations (200 mg L -1 ), important feeding flow rates (60 mL min -1 ) and low marble waste dosage (2 g L -1 ). The best removal capacity (175.7 mg g -1 ) was obtained for an initial lead concentration of 200 mg L -1 , a marble waste dose of 5 g L -1 and an aqueous pH of 5. Even using the real wastewater with low aqueous pH (1.1), lead was also completely removed using 20 g L -1 of the tested marble wastes. According to the energy-dispersive spectroscopy and X-ray diffraction analyses, lead removal seems to be controlled by both precipitation as cerussite (PbCO 3 ) and hydrocerussite (Pb 3 (CO 3 ) 2 (OH) 2 ), and adsorption onto the surface particles through cation exchange and complexation. The proposed low-cost material efficiently removes lead present in synthetic solutions and real wastewaters and constitutes an interesting environmental management option.

show abstract

“…Many laboratory studies have been conducted to investigate the ability of clay minerals to remove heavy metals including Pb, Cu and Cd from monometallic or polymetallic ideal solutions (e.g. Bourliva et al, 2013;Malamis et al, 2013;Potgieter et al, 2006). The ultimate goal of such studies is the fundamental understanding of the factors and mechanisms that control the interaction between metal ions and clay materials.…”

Section: Introductionmentioning

confidence: 99%