Modified Adsorbents for Removal of Heavy Metals from Aqueous Environment: A Review

Kumar, Rajeev; Laskar, Mohammad Asaduddin; Hewaidy, I.F.; Barakat, M.A.

doi:10.1007/s41748-018-0085-3

Cited by 49 publications

(19 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Finally, the attained results through the current study confirmed the high uptake capacities of nanoparticles and carbon-based adsorbents against different water contaminates including organic dyes [ 42 , 43 ].…”

Section: Resultssupporting

confidence: 65%

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

et al. 2020

Self Cite

View full text Add to dashboard Cite

Surfactant–modified exfoliated Fayum clay (CTAB–EC) obtained after chemical treatment with a CTAB/H2O2 solution was further decorated with magnetic Fe3O4 nanoparticles (MNP). The final nanocomposite (MNP/CTAB–EC) was characterized by XRD, SEM, FTIR, TEM and its adsorptive capability against a model cationic dye, crystal violet (CV), was evaluated. A comparison of the adsorption performance of the raw clay and its modified counterparts using H2O2, CTAB, CTAB/H2O2 or MNP indicated that the adsorption capacity of MNP/CTAB–EC was the highest for CV removal at pH 8.0. The pseudo‒second order for the kinetics and Freundlich model for adsorption equilibrium fitted well the CV removal experimental data at all tested temperatures (25, 40 and 55 °C). The enhancement of the Langmuir adsorption capacity from 447.1 to 499.4 mg g−1 with increasing the temperature from 25 to 55 °C revealed an endothermic nature of the removal process. The interactions between CV and MNP/CTAB–EC were interpreted using advanced statistical physics models (ASPM) in order to elucidate the adsorption mechanism. Multilayer model fitted the adsorption process and therefore, the steric and energetic factors that impacted the CV adsorption were also interpreted using this model. The aggregated number of CV molecules per MNP/CTAB–EC active site ( n ) was more than unity at all temperatures, representing thus a vertical adsorption orientation and a multi‒interactions mechanism. It was determined that the increase of CV uptake with temperature was mainly controlled by the increase of the number of active sites (NM). Calculated adsorption energies (ΔE) revealed that CV removal was an endothermic and a physisorption process (ΔE < 40 kJ mol −1). MNP/CTAB–EC was magnetically separated, regenerated by NaOH, and reused without significant decrease in its adsorption efficiency, supporting a prosperity of its utilization as an effective adsorbent against hazardous dyes from wastewaters.

show abstract

Section: Resultssupporting

confidence: 65%

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to Ntaflou and Vakros [36], the broad peak at 23° corresponding to 2θ indicated the presence of carbon-rich materials with less ordered structures due to pyrolysis. Peaks of other raw materials indicate lignin and cellulose [37]; however, after pyrolysis, the peaks related to lignin and cellulose disappeared [38].…”

Section: Results and Discussion 1) Adsorbent Characterisationmentioning

confidence: 98%

Biochar from Rice Husk as Efficient Biosorbent for Procion Red Removal from Aqueous Systems

et al. 2021

View full text Add to dashboard Cite

Numerous reports have elucidated the use of biochar (BC) to adsorb dyes from wastewater. However, its applicability for adsorbing Procion Red, which causes carcinogenic and mutagenic effects on aquatic life, has not been studied. In this work, biochar produced from rice husk in Sumatera, Indonesia was used as a biosorbent for Procion Red removal from aqueous systems. Rice husk-BC was characterised using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, surface area specific analysis, and scanning electron microscopy (SEM) for mor-phological analysis. The characterisation showed a (002) reflection peak at 2θ = 23° with broad and quite intense diffraction, which indicates reflection of electromagnetic waves by silicates, oxides and carbon present in the rice husk-BC. The surface area and SEM morphologies confirm that after pyrolysis, the surface of the rice husk changed. The FTIR spectra confirm the presence of functional groups such as the carboxylic acids and aromatic compounds. The surface area of rice husk-BC was up to ten times that of its raw material. The results of adsorption studies indicate that adsorption of Procion Red on rice husk-BC follows a pseudo-second-order (PSO) reaction with a rate constant of 0.044 min-1 and Langmuir isotherm models with a coefficient of correlation close to unity. The maximum adsorption capacity increased from 36.900 mg g-1 for the rice husk to 84.034 for the rice husk-BC. Thermodynamic analysis showed positive enthalpy and entropy, indicating that Procion Red adsorption is endothermic; thus, the Gibbs energy values decreased with increase in temperature, indicating that high temperatures are favourable for the adsorption process. Furthermore, the study of adsorption of Procion Red on rice husk-BC and regeneration of the adsorption capacity of rice husk-BC showed the largest drop in the fourth and last cycle.

show abstract

“…It is assumed that good interaction between the pollutant species with the catalyst surface facilitates better photocatalytic decomposition [2] , [3] , [4] . Prior to starting the photocatalysis of the pollutant, adsorption was performed in the dark to identify the saturation of the catalyst and to determine the pollutant scavenging efficiency of the materials during adsorption and photocatalysis [ 5 , 6 ]. Adsorption kinetic analysis is important to find the rate of the 2-CP removal and to identify the nature of the process, i.e.…”

Section: Data Descriptionmentioning

confidence: 99%

Adsorption and photocatalytic scavenging of 2-chlorophenol using carbon nitride-titania nanotubes based nanocomposite: Experimental data, kinetics and mechanism

2021

Self Cite

View full text Add to dashboard Cite

Adsorption and interaction of pollutant species on surface of the catalyst materials play an important role on the photocatalysis process. Herein, experimental data on the adsorption behavior of 2-chlorophenol (2-CP) onto graphitic pure carbon nitride (C 3 N 4 ), titania nanotubes (TiO 2 —NTs) and carbon nitride/titania nanotubes nanocomposite (C 3 N 4 /TiO 2 —NTs) from synthetic wastewater has been summarized. The data on photocatalytic degradation of the 2-CP under both ultraviolet (UV) and visible light irradiation is also presented. This work also evaluates the 2-CP scavenging efficiency of C 3 N 4 /TiO 2 —NTs nanocomposite prepared by calcination of 2 wt.% melamine with TiO 2 —NTs at 450 °C. The adsorption and photocatalysis experiments were conducted for 180 min at pH 7 with 100 mL solution of 2-CP (40 mg/L) and 0.05 g catalyst material. The acquired data can be valuable to identify the equilibrium time for 2-CP adsorption onto C 3 N 4 , TiO 2 —NTs, and C 3 N 4 /TiO 2 —NTs nanocomposite. Moreover, the obtained data can be useful to identify the suitable light source for the decomposition of 2-CP in the aquatic environment. The evaluated kinetic data might be significant for identifying the adsorption and photocatalysis reaction rate onto the applied catalyst materials. The obtained adsorption and photocatalysis data have been compared with that in literature to identify the adsorption and photocatalysis behavior of 2-CP on numerous catalysts at different experimental conditions.

show abstract

Modified Adsorbents for Removal of Heavy Metals from Aqueous Environment: A Review

Cited by 49 publications

References 46 publications

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

Biochar from Rice Husk as Efficient Biosorbent for Procion Red Removal from Aqueous Systems

Adsorption and photocatalytic scavenging of 2-chlorophenol using carbon nitride-titania nanotubes based nanocomposite: Experimental data, kinetics and mechanism

Contact Info

Product

Resources

About