Removal of Cr(VI) and As(V) from aqueous solutions by HDTMA-modified zeolite Y

Yusof, Aminah Md; Malek, Nik Ahmad Nizam Nik

doi:10.1016/j.jhazmat.2008.05.134

Cited by 293 publications

(135 citation statements)

References 18 publications

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“…Although As 5+ tends to be less toxic compared to of As 3+ , it is thermodynamically more stable due to it predominates under normal conditions and becomes the cause of major contaminant in ground water [14]. Arsenate which is in the pentavalent state (As 5+ ) is also considered to be toxic and carcinogenic to human [18].…”

Section: Arsenic (As)mentioning

confidence: 99%

A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation

Tangahu

Abdullah

Basri

et al. 2011

International Journal of Chemical Engineering

1,354

534

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Heavy metals are among the most important sorts of contaminant in the environment. Several methods already used to clean up the environment from these kinds of contaminants, but most of them are costly and difficult to get optimum results. Currently, phytoremediation is an effective and affordable technological solution used to extract or remove inactive metals and metal pollutants from contaminated soil and water. This technology is environmental friendly and potentially cost effective. This paper aims to compile some information about heavy metals of arsenic, lead, and mercury (As, Pb, and Hg) sources, effects and their treatment. It also reviews deeply about phytoremediation technology, including the heavy metal uptake mechanisms and several research studies associated about the topics. Additionally, it describes several sources and the effects of As, Pb, and Hg on the environment, the advantages of this kind of technology for reducing them, and also heavy metal uptake mechanisms in phytoremediation technology as well as the factors affecting the uptake mechanisms. Some recommended plants which are commonly used in phytoremediation and their capability to reduce the contaminant are also reported.

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Section: Arsenic (As)mentioning

confidence: 99%

A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation

Tangahu

Abdullah

Basri

et al. 2011

International Journal of Chemical Engineering

1,354

534

View full text Add to dashboard Cite

show abstract

“…suggested that the monovalent form (HCrO4 − ) dominated at low pH required only a single site on the clay minerals' surface [33]. On the contrary, at high pH values, the divalent form (CrO4 2− ) dominated at high pH values required two sites with a positive charge on the surface of clay minerals.…”

Section: Removal Efficiency and Mechanismmentioning

confidence: 99%

Removal of Cr(VI) and Toxic Ions from Aqueous Solutions and Tannery Wastewater Using Polymer-Clay Composites

et al. 2017

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Polymer-clay composites were prepared by natural zeolite (clinoptilolite) or naturally local clay deposits in an N,N-methylene-bis-acrylamide as cross-linked. The resultant composites were used for the removal of Cr(VI) from an aqueous solution. Additionally, their effects on soluble ions of tannery wastewater were investigated. The produced composites were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The results showed that Cr(VI) removal is dependent upon initial concentrations and pH. The adsorption quantity of Cr(VI) onto the polymerized clay deposit followed by polymerized zeolite exhibited higher values than their original samples. The polymer-clay composite of clay deposit showed the highest removal of 76.3-100% overall initial concentrations of 10-50 mg L −1 and at initial pH of 2. Kinetics of Cr(VI) removal by various sorbents was predicted using a pseudo-second order model. Our findings showed that the levels of salinity and various soluble ions (Cr 2+ , Na + , Cl − and SO 4 2− ) in tannery wastewater are very high, and their levels were reduced after treatment, especially by polymerized sorbents. It could be concluded that the polymer-clay composites may be employed as a highly efficient sorbent for the removal of Cr(VI) and toxic ions from the wastewater.

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“…Cationic surfactants can also enhance the metal affinity of synthesised zeolites; for instance, HDTMA-Br laumontite was successfully tested for the removal of chromate, molybdate, and tungstate [72]. Yusof and Malek [92] reported the adsorption of Cr(VI) and As(V) using a zeolite Y synthesised from rice husk ash that had been modified using HDTMA-Br. The unmodified zeolite Y has little or no affinity for these metal species.…”

Section: Surfactant-modified Zeolitesmentioning

confidence: 99%

Use of Surfactant-Modified Zeolites and Clays for the Removal of Heavy Metals from Water

Jiménez-Castañeda

Medina

2017

Water

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Abstract:The presence of heavy metals in water for human use or consumption represents a major risk to human health. It is therefore important to find materials to remove or minimise the concentration of these pollutants. The adsorption process for the removal of heavy metals is favoured by the use of low-cost materials that exhibit a porous structure and a high cation exchange capacity, such as zeolites and clays. On the other hand, chemical treatments, e.g., using acids and bases, can modify the properties of these materials, but more recently the application of surfactants has also shown to be successful for broadening their metal affinity and allowing the removal of diverse organic and inorganic pollutants from water. This paper reviews the application of modified zeolites and clays for the removal of heavy metals from water.

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Removal of Cr(VI) and As(V) from aqueous solutions by HDTMA-modified zeolite Y

Cited by 293 publications

References 18 publications

A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation

A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation

Removal of Cr(VI) and Toxic Ions from Aqueous Solutions and Tannery Wastewater Using Polymer-Clay Composites

Use of Surfactant-Modified Zeolites and Clays for the Removal of Heavy Metals from Water

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