Needle-like iron oxide@CaCO3 adsorbents for ultrafast removal of anionic and cationic heavy metal ions

Islam, Md. Shahinul; Choi, Won San; Nam, Bora; Yoon, Cheol Yong; Lee, Ha-Jin

doi:10.1016/j.cej.2016.08.079

Cited by 88 publications

(17 citation statements)

References 33 publications

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“…The increase in adsorption with dosage increase may be attributed to an increase in the number of active sites available (Akpomie and Dawodu, 2016 ). Similar results have been reported (Njoya et al, 2006 ; Barka et al, 2013 ; Islam et al, 2017 ). Furthermore, a decrease in the adsorption capacity of metal ions with increase in adsorbent dosage on all the adsorbents was obtained as shown in Figure 5 .…”

Section: Resultssupporting

confidence: 89%

“…Where q t (mg/g) is the sorption capacity at time t (min), K I (min −1 ) is the PFO rate constant, K 2 (g/mg/min) the PSO rate constant, initial sorption rate h = K 2 q

(mg/g/min), K d (mg/gmin 1/2 ) the ID rate constant with intercept C and K fd (mg/gmin) is the LFD constant with intercept Y (Ravishankar et al, 2016 ; Islam et al, 2017 ).…”

Section: Methodsmentioning

confidence: 99%

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Calcined Corncob-Kaolinite Combo as New Sorbent for Sequestration of Toxic Metal Ions From Polluted Aqua Media and Desorption

et al. 2018

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This study investigated a new area of improving the adsorption capacity of clay using corn cob as an alternative means of clay modification to the more expensive and complicated chemical treatment techniques. Kaolinite Clay (KC), Calcined corncob-kaolinite Combo (CCKC), and Corncob (CC) adsorbents were utilized. The adsorbents were characterized by Fourier Transform-Infrared (FT-IR) Spectroscopy, Scanning Electron Microscopy (SEM), X-ray fluorescence spectroscopy, and Brunauer-Emmett-Teller (BET) surface area analyzer. Batch adsorption methodology was used to investigate the effect of pH, initial metal concentration, adsorbent dose, and contact time on adsorption of Pb (II) and Cd (II). A slight increase in BET surface area of 29.31 m2/g for CCKC from 14.12 m2/g for raw KC was achieved. The trend of metal adsorption on the adsorbents was in the order CC>CCKC>KC. The Langmuir isotherm was found to present the best fit for the unmodified adsorbents while the Freundlich was applicable for CCKC indicating multilayer heterogeneous surface. The pseudo second order kinetic model was found to be suitable in the kinetic analysis. Thermodynamic studies revealed a spontaneous physical adsorption process of metal ions on CCKC. The combo adsorbent showed highest percentage desorption (>70%) of Cd and Pb ions in both acid and basic media compared to the other adsorbents. The results of the study established the efficiency of calcined corn cob kaolinite combo as suitable adsorbent for metal ions.

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Section: Resultssupporting

confidence: 89%

“…Where q t (mg/g) is the sorption capacity at time t (min), K I (min −1 ) is the PFO rate constant, K 2 (g/mg/min) the PSO rate constant, initial sorption rate h = K 2 q

(mg/g/min), K d (mg/gmin 1/2 ) the ID rate constant with intercept C and K fd (mg/gmin) is the LFD constant with intercept Y (Ravishankar et al, 2016 ; Islam et al, 2017 ).…”

Section: Methodsmentioning

confidence: 99%

Calcined Corncob-Kaolinite Combo as New Sorbent for Sequestration of Toxic Metal Ions From Polluted Aqua Media and Desorption

et al. 2018

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“…Its common names include: Cowpea (English), beans (Nigeria), ewa (Yoruba), Wake (Hausa) and Agwa (Igbo). Islam et al [8] emphasized that all parts of the plant used as food are nutritious providing protein and vitamins. It is chiefly a vegetable and grain crop for human.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of silver nanoparticle from Vigna unguiculata stem as adsorbent for malachite green in a batch system

et al. 2019

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This study describes a simple and cost effective method for the synthesis of silver nanoparticles from locally available Vigna unguiculata L. stem extract, as alternative method to the expensive and toxic chemicals used, and its application as adsorbent for malachite green (MG) in a Batch system. The AgNPs were synthesized using AgNO 3 as precursor and stem extract as reducing and capping agent. The AgNPs were characterized using UV-Vis, SEM-EDX, FTIR and XRD. The effects of contact time, pH of solution, initial dye concentration, adsorbent concentration and temperature were studied and they proved useful in the description of the adsorption process. AgNPs showed SPR bands at 455 nm. The XRD micrographs showed face centered cubic crystal structure with average crystalline size of the synthesized nanoparticle of ~ 25 nm. Alkaloids present in Vigna unguiculata L. stem played a role in the reduction of AgNO 3. An optimum pH of adsorption was achieved at 9.0. The adsorption process was observed to be exothermic. Equilibrium isotherm models showed Langmuir isotherm with R 2 of 0.99194 and residual sum of squares (RSS) of 5.23541 × 10 −5 , indicating monolayer adsorption. Kinetic studies revealed Pseudo-first order kinetics best fitted the rate of adsorption and intra-particle diffusion revealed that the adsorption process was controlled by surface phenomenon and intra-particle diffusion. The results showed the applicability of AgNPs in adsorption. However, the relatively low percentage removal (21.6% at 200 ppm) suggests that Silver nanoparticle synthesized from Vigna unguiculata L. stem, alone may not be sufficient in the complete adsorption of MG dye.

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“…The most common toxic materials in wastewaters responsible for particular problems are heavy metal ions and azo dyes [13][14][15][16][17][18]. Despite the fact that the human body needs low doses of metal ions such as for example Zn(II) ions, their excess may cause eminent health problems such as depression, lethargy, neurological signs and increased thirst.…”

Section: Introductionmentioning

confidence: 99%

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment

et al. 2017

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Nanomaterials have been extensively studied for heavy metal ions and dye removals from wastewater. This article reviews the role of nanomaterials as effective adsorbents for wastewater purification. In recent years, numerous novel nanomaterial adsorbents have been developed for enhancing the efficiency and adsorption capacities of removing contaminants from wastewater. The innovation, forthcoming development, and challenges of cost-effective and environmentally acceptable nanomaterials for water purification are discussed and reviewed in this article. This review concludes that nanomaterials have many unique morphological and structural properties that qualify them to be used as effective adsorbents to solve several environmental problems. Graphical Abstract& Hamidreza Sadegh

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Needle-like iron oxide@CaCO3 adsorbents for ultrafast removal of anionic and cationic heavy metal ions

Cited by 88 publications

References 33 publications

Calcined Corncob-Kaolinite Combo as New Sorbent for Sequestration of Toxic Metal Ions From Polluted Aqua Media and Desorption

Calcined Corncob-Kaolinite Combo as New Sorbent for Sequestration of Toxic Metal Ions From Polluted Aqua Media and Desorption

Synthesis of silver nanoparticle from Vigna unguiculata stem as adsorbent for malachite green in a batch system

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment

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