Water treatment technologies in removing heavy metal ions from wastewater: A review

Saleh, Tawfik A.; Mustaqeem, Mujahid; Khaled, Mazen

doi:10.1016/j.enmm.2021.100617

Cited by 190 publications

(139 citation statements)

References 100 publications

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…In addition to the commonly used adsorbents like carbon, clays, zeolite, and natural and synthetic polymers, other materials with improved properties, such as composite metal organic frameworks (MOFs), have found wide application in the adsorption field. 6 − 8 …”

Section: Introductionmentioning

confidence: 99%

High-Performance Material for the Effective Removal of Uranyl Ion from Solution: Computationally Supported Experimental Studies

et al. 2022

View full text Add to dashboard Cite

Adsorption is a widely used method for pollution removal and for the recovery of valuable species. In recent years, the use of metal–organic compounds among the adsorbents used in adsorption studies has increased. In this study, the performance of the water-insoluble Fe complex as a metal organic framework (MOF-Fe-Ta) of water-soluble tannic acid, which is not used as an adsorbent in uranium recovery and removal, was investigated. For the characterization of the new synthesized material, Fourier transform infrared, scanning electron microscopy, and X-ray diffraction analyses were performed. The changes in the adsorption process based on various parameters were investigated and discussed. The point of zero charges value of the adsorbent was found as 5.52. It was noticed that the adsorption increases as the pH increases. Analyzing the effect of concentration on adsorption, we determined which model explained the adsorption better. The monolayer capacity of the adsorbent determined in light of the Langmuir model was reported as 0.347 mol kg –1 . The Freundlich constant, namely the β value obtained in the Freundlich model, which is a measure of surface heterogeneity, was found to be 0.434, and the E DR value, which was found from the Dubinin–Raduskevich model and accepted as a measure of adsorption energy, was 10.3 kJ mol –1 . The adsorption was kinetically explained by the pseudo-second-order model and the adsorption rate constant was reported as 0.15 mol –1 kg min –1 . The effect of temperature on adsorption was studied; it was emphasized that adsorption was energy consuming, that is, endothermic and Δ H was found as 7.56 kJ mol –1 . The entropy of adsorption was positive as 69.3 J mol –1 K –1 . As expected, the Gibbs energy of adsorption was negative (−13.1 kJ mol –1 at 25 °C), so adsorption was considered as a spontaneous process. Additionally, the power and mechanism of the interaction between studied adsorbent and adsorbate are explained through density functional theory computations. Computationally obtained data supported the experimental studies.

show abstract

Section: Introductionmentioning

confidence: 99%

High-Performance Material for the Effective Removal of Uranyl Ion from Solution: Computationally Supported Experimental Studies

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Concentrations of Cr(VI) and other heavy metals in water can be controlled by ion exchange, solvent extraction, chemical precipitation, membrane-based separation, and adsorption 7 – 10 . Among these technologies, adsorption is popular due to its efficiency, convenience, smaller land footprint, and simplicity of operation 8 , 11 .…”

Section: Introductionmentioning

confidence: 99%

Optimized removal of hexavalent chromium from water using spent tea leaves treated with ascorbic acid

Zaib

Kyung

2022

Sci Rep

View full text Add to dashboard Cite

Spent tea leaves were functionalized with ascorbic acid to obtain treated tea waste (t-TW) to encourage the adsorption of hexavalent chromium from water. The adsorption removal of Cr(VI) was systematically investigated as a function of four experimental factors: pH (2–12), initial Cr(VI) concentration (1–100 mg L−1), t-TW dosage (0–4 g L−1), and temperature (10–50 °C) by following a statistical experimental design. A central composite rotatable experimental design based on a response surface methodology was used to establish an empirical model that assessed the individual and combined effects of factors on adsorptive removal of Cr(VI). The model was experimentally verified and statistically validated then used to predict optimal adsorption removal of Cr(VI) from water. At optimized conditions, ≥ 99% of 1 mg L−1 Cr(VI) can be removed by 4 g L−1 t-TW at a pH of 9. The adsorptive mechanism was assessed by conducting kinetics and equilibrium studies. The adsorption of Cr(VI) by t-TW followed a pseudo-second-order kinetics model (k2 = 0.001 g mg−1 h−1) and could be described by Langmuir and Temkin isotherms, indicating monolayer adsorption and predominantly adsorbate-adsorbent interactions. The t-TW exhibited a competitive Cr(VI) adsorption capacity of 232.2 mg g−1 compared with the other low-cost adsorbents. These results support the utilization of tea waste for the removal of hazardous metal contaminants from aqueous systems.

show abstract

“…The importance of Th in nuclear industry blended with the requirement of having cost effective, biodegradable, environmentally benign, solid phase separation, the present investigation was carried out. Some efforts were documented in the literature in order to achieve efficient separation of thorium from carbon nano fiber modified polymer, bentonite-gum-arabic composite, nano materials and green materials [38][39][40][41]. In order to understand the mechanism of sorption, different isotherm models have been employed to fit the experimental data.…”

Section: Introductionmentioning

confidence: 99%

The application of food/agro-waste and spent household products for the environmentally benign separation of thorium

Salunkhe

Chauhan

Sengupta

2022

Environ. Sci.: Adv.

View full text Add to dashboard Cite

show abstract

Water treatment technologies in removing heavy metal ions from wastewater: A review

Cited by 190 publications

References 100 publications

High-Performance Material for the Effective Removal of Uranyl Ion from Solution: Computationally Supported Experimental Studies

High-Performance Material for the Effective Removal of Uranyl Ion from Solution: Computationally Supported Experimental Studies

Optimized removal of hexavalent chromium from water using spent tea leaves treated with ascorbic acid

The application of food/agro-waste and spent household products for the environmentally benign separation of thorium

Contact Info

Product

Resources

About