Investigation of As(V) removal from acid mine drainage by iron (hydr) oxide modified zeolite

Nekhunguni, Pfano Mathews; Tavengwa, Nikita Tawanda; Tutu, Hlanganani

doi:10.1016/j.jenvman.2017.04.038

Cited by 41 publications

(34 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There is a wide literature coverage which demonstrated the application of zeolites in adsorption of heavy metals from AMD (Masukume et al 2017;Nekhunguni et al 2017a;Mokgehle et al 2019;Znedelska et al 2018;Buenaño et al 2017;Shabalala and Basitere 2020). For instance, zeolites were evaluated by Turan and Ozgonenel (2013) as Cu (II) adsorbents through an adaptive neural fuzzy interface system where average adsorption performances were obtained.…”

Section: Zeolites and Chemically Modified Zeolites As Adsorbents For Heavy Metals In Amdmentioning

confidence: 99%

“…Some materials studied using this technique include zeolites. These materials and their modified forms have been shown to be very good adsorbents for heavy metals due to their desirable cation exchange properties (Nekhunguni et al 2017a;Mokgehle et al 2019). However, zeolites were reported to have setbacks such as poor ion selectivity, for instance, Hui et al (2005) reported on the poor adsorption performance of zeolaite-4A in comparison to coal fly ash for removal of Cu 2+ , Cr 3+ , Zn 2+ , Co 2+ and Ni 2+ from aqueous systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent developments in materials used for the removal of metal ions from acid mine drainage

Mokgehle

Tavengwa

2021

Appl Water Sci

View full text Add to dashboard Cite

Acid mine drainage is the reaction of surface water with sub-surface water located on sulfur bearing rocks, resulting in sulfuric acid. These highly acidic conditions result in leaching of non-biodegradeable heavy metals from rock which then accumulate in flora, posing a significant environmental hazard. Hence, reliable, cost effective remediation techniques are continuously sought after by researchers. A range of materials were examined as adsorbents in the extraction of heavy metal ions from acid mine drainage (AMD). However, these materials generally have moderate to poor adsorption capacities. To address this problem, researchers have recently turned to nano-sized materials to enhance the surface area of the adsorbent when in contact with the heavy metal solution. Lately, there have been developments in studying the surface chemistry of nano-engineered materials during adsorption, which involved alterations in the physical and chemical make-up of nanomaterials. The resultant surface engineered nanomaterials have been proven to show rapid adsorption rates and remarkable adsorption capacities for removal of a wide range of heavy metal contaminants in AMD compared to the unmodified nanomaterials. A brief overview of zeolites as adsorbents and the developent of nanosorbents to modernly applied magnetic sorbents and ion imprinted polymers will be discussed. This work provides researchers with thorough insight into the adsorption mechanism and performance of nanosorbents, and finds common ground between the past, present and future of these versatile materials.

show abstract

Section: Zeolites and Chemically Modified Zeolites As Adsorbents For Heavy Metals In Amdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent developments in materials used for the removal of metal ions from acid mine drainage

Mokgehle

Tavengwa

2021

Appl Water Sci

View full text Add to dashboard Cite

show abstract

“…Previously, studies were conducted using a modified and natural zeolite to purify acid and neutral solutions. In the literature, the following transformations of zeolites occur to increase the extraction efficiency of metals and metalloids: iron (hydr) oxide modification [10], surface modification by surfactants [11]. The purpose of this work was to compare the extraction efficiency of As, Sb, Cu and Zn from real drainage solutions with modified MnO 2 heulandite and its natural analog.…”

Section: Introductionmentioning

confidence: 99%

Metals and Metalloids Removal from Mine Water Using Natural and Modified Heulandite

Abrosimova¹,

Saeva²,

Бортникова³

et al. 2019

IJESD

View full text Add to dashboard Cite

The paper represents the results of batch experiments on the extraction of As, Sb, Zn, and Cu from real acidic and alkaline drainage solutions using natural and modified MnO 2 heulandite [AlSi 3 O 8 ] 2 ×Ca(H 2 O) 5. It was found that the modified zeolite is effective for removal As and Sb, but it is necessary to take into account the possibility of Mn releasing into the solution after interaction with acid drainage. For Zn removing from acid drainage solutions, the modified zeolite is not suitable. Both samples of heulandite effectively remove arsenic from the acidic solution as opposed to the alkaline solution. Perhaps this is due to the presence in the acid solution of a large amount of iron and aluminum, which during neutralization form hydroxides, contributing to additional sorption of the elements.

show abstract

“…According to Ayele et al (2016), zeolites are crystalline microporous materials, and during the second half of the 20th century and the early decades of the 21st century, they have been consolidated as important catalysts in processes in the oil refining, chemical and petrochemical industries (Rehan et al, 2017), as well as in environmental control (Nekhunguni et al, 2017;Wan et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Use of zeolite synthesized from coal ashl from Santa Catarina for removal of iron, manganese and methylene blue dye in water

2018

View full text Add to dashboard Cite

The fly ash of coal, generated in a thermoelectric plant, was used to synthesize zeolite by hydrothermal treatment with a sodium hydroxide solution. The zeolite synthesized was used as an adsorbent of metals (Fe and Mn) and of the methylene blue dye in water. The characterization of the zeolite showed that silicon oxide is the main compound in its composition, followed by aluminum, iron, sodium and calcium, which together correspond to more than 86% of its composition. These were used to investigate the kinetic parameters of adsorption and the isotherm of the metals and the methylene blue dye in aqueous solutions. Three kinetic models, pseudo-first order, pseudo-second order and intraparticle diffusion were used to predict adsorption rate constants. The adsorption kinetics of the dye and metals followed the pseudo-second order kinetics and reached equilibrium in 15 minutes with a 99% removal rate for metals, independently of the pH. The values of the diffusion constants (K2) for iron in pH 5, 7 and 8 were 1.3158; 1.3881 e 0.6053 mg.g-1.min-1 and for manganese 1.2511; 1.5239 and 1.4336 mg.g-1.min-1, respectively. For methylene blue, the removal rate was 90% and the constant (K2) value was 0.5437 mg.g-1.min-1. The studies showed the existence of different stages in the adsorption of the metals and the methylene blue dye in zeolite.

show abstract

Investigation of As(V) removal from acid mine drainage by iron (hydr) oxide modified zeolite

Cited by 41 publications

References 52 publications

Recent developments in materials used for the removal of metal ions from acid mine drainage

Recent developments in materials used for the removal of metal ions from acid mine drainage

Metals and Metalloids Removal from Mine Water Using Natural and Modified Heulandite

Use of zeolite synthesized from coal ashl from Santa Catarina for removal of iron, manganese and methylene blue dye in water

Contact Info

Product

Resources

About