Development of microporous activated Aloji clay for adsorption of lead (II) ions from aqueous solution

Obayomi, Kehinde Shola; Auta, M.

doi:10.1016/j.heliyon.2019.e02799

Cited by 26 publications

(17 citation statements)

References 39 publications

(33 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different values of R L are interpreted as follows: R L = 0 (irreversible), 0 < R L < 1 (favorable), R L = 1 (linear), and R L > 1 (unfavorable) (Weber and Chakravorti 1974;Obayomi and Auta 2019). As can be seen from Tables 3 and 4, the values of R L were found between 0 and 1, which suggests that the adsorption of AO7 and Cr(VI) onto the prepared modified biochar materials was favorable.…”

Section: Adsorption Isothermsmentioning

confidence: 92%

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Santhosh

Daneshvar

Tripathi

et al. 2020

Environ Sci Pollut Res

100

View full text Add to dashboard Cite

In this study, different types of magnetic biochar nanocomposites were synthesized using the co-precipitation method. Two biochar materials, namely, sewage sludge biochar and woodchips biochar, were prepared at two different temperatures, viz., 450 and 700 °C. These biochars were further modified with magnetic nanoparticles (Fe 3 O 4 ). The modified biochar nanocomposites were characterized using field emission–scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), SQUID analysis, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR). The potential of prepared adsorbents was examined for the removal of hexavalent chromium (Cr(VI)) and Acid orange 7 (AO7) dye from water as a function of various parameters, namely, contact time, pH of solution, amount of adsorbents, and initial concentrations of adsorbates. Various kinetic and isotherm models were tested to discuss and interpret the adsorption mechanisms. The maximum adsorption capacities of modified biochars were found as 80.96 and 110.27 mg g -1 for Cr(VI) and AO7, respectively. Magnetic biochars showed high pollutant removal efficiency after 5 cycles of adsorption/desorption. The results of this study revealed that the prepared adsorbents can be successfully used for multiple cycles to remove Cr(VI) and AO7 from water. Graphical Abstract Electronic supplementary material The online version of this article (10.1007/s11356-020-09275-1) contains supplementary material, which is available to authorized users.

show abstract

Section: Adsorption Isothermsmentioning

confidence: 92%

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Santhosh

Daneshvar

Tripathi

et al. 2020

Environ Sci Pollut Res

100

View full text Add to dashboard Cite

show abstract

“…1000 mg/L stock solutions of Cd(II) and Cr(VI) ions were prepared by known weight each of Cd(NO 3 ) 2 .4H 2 0 and K 2 Cr 2 O 7 dissolution in distilled water (1000 mL) and was used further to prepare the adsorbates (Cd(II) and Cr(IV)) solution of required concentrations (50, 100 and 150 mg/L) in a separate flask. In this experimental batch adsorption study, the experimental procedure described by [21,22] was adopted. Equilibrium batch adsorption studies with various concentrations (50, 100 and 150 mg/L) of Cr(VI) and Cd(II) at different temperatures (35, 45 and 55 C) in a set of Erlenmeyer flasks of 250 mL were carried out.…”

Section: Experimental Batch Adsorption Studymentioning

confidence: 99%

“…The effect of pH result as presented in Figure 5, showed that for Cd(II) ions, the percentage adsorbed increased from 77.24 to 96.45 % as the pH increased from 6 to 8 and remained constant as the pH increased beyond this point (pH > 8). The poor percentage uptake of Cd(II) ions at lower pH values maybe as a result of more hydrogen ion (protonation) on the adsorbent surface in an acidic medium, thereby resulting in electrostatic repulsion between the positively charged Cd(II) and positively charged adsorbent surface [22]. For Cr(VI) ions, the percentage adsorbed increased from 79.26 to 90.37 % as the pH increased from 1 to 2, and a further increase in pH (>2) resulted in percentage adsorbed decrease.…”

Section: Ph Solutionmentioning

confidence: 99%

“…Heavy metals like chromium and cadmium when exceeding their tolerance level in water are extremely toxic. Chromium and cadmium showed toxic biological effects such as damage to bones and kidney, death in humans, acute effects in children, necrosis nephritis, bronchitis, abdominal pain, liver damage, skin irritation, respiratory cancer, and irritation of gastrointestinal mucosa [4]. Chromium exists as two stable species; Cr (III) which is a macronutrient, and the toxic hexavalent Cr (VI) [5].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Statistical analyses on effective removal of cadmium and hexavalent chromium ions by multiwall carbon nanotubes (MWCNTs)

Obayomi

Bello

Yahya

et al. 2020

Heliyon

Self Cite

View full text Add to dashboard Cite

In this work, multiwall carbon nanotubes (MWCNTs) developed from cobalt-ferrite catalyst on activated carbon (from castor seed), was used as an adsorbent for the removal of cadmium and hexavalent chromium ions. The effectiveness of the adsorbent for the uptake of Cd(II) and Cr(VI)ions from aqueous solution was investigated in a process batch adsorption study. The developed activated carbon and MWCNTs were characterized by Brunauer-Emmett-Teller (BET) surface area analysis, Fourier Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) for the determination of surface area, functional group, and surface morphology, respectively. The BET surface area of activated carbon and developed adsorbent from Co-Fe/AC was 230.24 and 372.42 m 2 /g, respectively. The operational parameters evaluated on the adsorption efficiency were solution pH, temperature, adsorbent dosage initial metal ions concentration, and contact time. The adsorption of Cd(II) and Cr(VI) were found to have attained equilibrium positions in 60 min for the concentration range tested, respectively. The four linearized adsorption isotherm models; Langmuir, Freundlich, Temkin and Dubinin Radushkevich (D-R) tested, when compared, revealed that Langmuir isotherm fitted well to the experimental data judging from the higher correlation coefficient values (R 2 ) and lower values of the error functions (chi-square (χ 2 ), the sum of square error (ERRSQ/SSE) and the sum of absolute error (EABS))with monolayer adsorption capacities of 404.858 and 243.902 mg/g for Cd(II) and Cr(VI) ions, respectively. Adsorption kinetic models investigated by pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion showed the conformity of pseudo-second-order model to the process adsorption as informed by the higher values R 2 and Adj, R 2 , maximum log-likelihood and smaller ERRSQ/SSE, χ 2 , Akaike information criterion (AIC), Bayesian information criterion (BIC), and Hannan-Quinn information criterion (HQIC). The intraparticle diffusion model plots indicated that intraparticle diffusion was not the only rate-limiting step. Thermodynamic adsorption parameters (ΔH o and ΔG o , ΔS o ) showed that the adsorption of Cd (II) and Cr (VI) ions was spontaneous, endothermic, and increased in randomness between the adsorbate-adsorbent. The mean adsorption energy (E), the heat of adsorption (ΔH o ), and activation energy (E a ) values, revealed the adsorption mechanism of Cd(II) and Cr(VI) onto MWCNTs as a combination of chemical and physical adsorption but dominated more by chemical adsorption. IntroductionWater is particularly important to the existence of living organisms in the world. However, human activities which include population growth, industrialization increase, and urbanization have caused rapid contamination, compromising the availability of potable water [1]. The release of harmful substances like heavy metals, due to human actions, has posed environmental problems, affecting human health [2,3]. Heavy metals like chromium and cadmium when exceed...

show abstract

“…The separation factors constant R L used to ascertain the Langmuir model, which is defined by the following equation (Eq. 7)[45]:…”

mentioning

confidence: 99%

Removal of Cd(II), Cu(II), and Pb(II) by adsorption onto natural clay: a kinetic and thermodynamic study

Abbou¹,

Lebkiri²,

Ouaddari³

et al. 2021

Turk J Chem

View full text Add to dashboard Cite

IntroductionNatural water resources are becoming increasingly scarce. Thus, the state of the environment has become one of humanity's major concerns because of its degradation. This degradation is mainly due to industrial development which generates effluents discharged into the receiving environment without any treatment in most cases. These releases consist of toxic chemical elements and compounds, including heavy metals, which pose a serious threat to our environment and impair water quality. Currently, they are of great concern because of their toxicity to ecosystems and their harmful effects on human health. Cadmium, copper, and lead are considered to be dangerous micropollutants [1], the toxicity caused by these metals is considered to be high even to the state of traces [2]. Many cleaning methods and techniques have been developed in recent years to remove heavy metals from polluted waters. These techniques include chemical precipitation processes, flocculation, filtration, ion exchange, membrane processes, and adsorption [3][4][5][6][7][8]. The most used and studied method is adsorption method, due to its ease of use and the high availability and abundance of natural adsorbents [9][10][11][12]. Activated carbons are among the most widely used materials due to their high adsorption capacity [13], but they have numerous disadvantages, including high cost, intraparticle resistance in the adsorption process, low mechanical strength, and difficulty to regenerate. [14].Natural clay minerals have recently received considerable attention as alternative materials that are less expensive, nontoxic, and abundant and that have multifunctional properties depending on the type of clay [15]. The main advantages of using these materials are due to their different characteristics, low cost, and abundant availability.The aim of this study is the valorization of a Moroccan natural clay as an adsorbent for the removal of cadmium, copper, and lead from synthetic aqueous solutions. The adsorbent was characterized using the X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) methods. To better understand the nature

show abstract

Development of microporous activated Aloji clay for adsorption of lead (II) ions from aqueous solution

Cited by 26 publications

References 39 publications

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Statistical analyses on effective removal of cadmium and hexavalent chromium ions by multiwall carbon nanotubes (MWCNTs)

Removal of Cd(II), Cu(II), and Pb(II) by adsorption onto natural clay: a kinetic and thermodynamic study

Contact Info

Product

Resources

About