Use of Synthetic and Natural Zeolites Tailored for As(V) Sorption

Krauklis, Andrey E.

doi:10.5772/intechopen.72614

Cited by 5 publications

(12 citation statements)

References 28 publications

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“…The modification method of natural zeolites with a mixed oxidation state manganese oxide used in this communication is also reported in two other works [11,12]. Conditions of the modification are also consistent with that of Mn 8 0 10 CI 3 synthesis described by G. Buisson [15].…”

Section: Methodssupporting

confidence: 80%

“…EDX of the initial zeolite showed it contained no traceable amounts of Mn. XRD diffraction patterns showed that the sorbent was modified with a new crystalline phase, which was found to be Mn 8 0 10 CI 3 [11,12]. SEM micrograph of the crystalline Mn 8 0 10 CI 3 modification compound on the surface of the zeolite is shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…The material also contains cristobalite, clay mica, plagioclase, rutile, quartz. Size of particles was 1-2.5 mm [12,14].…”

Section: Methodsmentioning

confidence: 99%

“…Manganese compounds are used for modification of sorbents for As(V) removal from water [11,12]. Clinoptilolite modification with manganese oxides significantly enhances sorption capacity of As(V) compared to an unmodified clinoptilolite [11][12][13]. Mn 8 0 10 CI 3 -modification improves As(V) sorption capacities of zeolites [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Clinoptilolite modification with manganese oxides significantly enhances sorption capacity of As(V) compared to an unmodified clinoptilolite [11][12][13]. Mn 8 0 10 CI 3 -modification improves As(V) sorption capacities of zeolites [11,12]. As(V) has affinity towards crystalline Mn 8 0 10 CI 3 [11].…”

Section: Introductionmentioning

confidence: 99%

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Unexpected Precipitation Observed during Arsenic Removal from Water via Sorbent Modified with a Mixed Oxidation State Manganese

Krauklis¹

2018

Int J Appl Sci Res Rev

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Drinking water contamination with As(V) is a crucial problem for millions of people dependent on groundwater resources in some regions of the world. Accumulation of arsenic compounds in the body by using such water poses serious health risks. Among many types of materials, Mn-modified sorbents are used for water treatment and arsenic removal. In this short communication, a newly observed phenomenon is reported, being an unexpected precipitation process occurring during the As(V) sorption from an aqueous solution via Mn-modified clinoptilolite. The quantity of formed precipitates was observed to increase with the initial concentration of As(V) present in water. While this short communication is intended only to report a novel observation, some implications can be expected. Additional studies are required to understand the underlying mechanism and implications of such precipitation during the water treatment process, raising questions on limitations of the use of such sorbents. While it is not completely certain, limited experimental evidence indicates that precipitates are formed by interaction of Mn 8 0 10 CI 3 (mixed oxidation state Mn) and As(V), and exist in the form of hydrates. The precipitates are unstable in air at room temperature and moderate humidity, and degrade shortly thereafter outside of water solution.

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Section: Methodssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

“…The material also contains cristobalite, clay mica, plagioclase, rutile, quartz. Size of particles was 1-2.5 mm [12,14].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Unexpected Precipitation Observed during Arsenic Removal from Water via Sorbent Modified with a Mixed Oxidation State Manganese

Krauklis¹

2018

Int J Appl Sci Res Rev

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Effects of conservation buffer systems on adsorption of fluorescent‐labeled Escherichia coli

et al. 2023

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The magnitude of bacterial transport through runoff into surface water or infiltration into groundwater is influenced by the adsorption processes in soil. The objective of this study was to evaluate fluorescent-labeled Escherichia coli (E. coli) adsorption by soil under agroforestry buffer (AB), grass buffer (GB), and row crop (RC) management. Adsorption experiments were conducted by inoculating three masses (0.5, 1, and 10 g) of each treatment (AB, GB, and RC) with E. coli O157:H7-GFP with concentration ranges of 10 5 -10 8 colony-forming units (cfu) ml −1 . Adsorption data were evaluated using Langmuir, Freundlich, and Temkin adsorption isotherm models. The Freundlich isotherm model described the observed data well for all treatments using the 10-g soil mass, with the R 2 values closer to unity in all treatments. The Freundlich K f parameter, an indicator of adsorption capacity, was higher for the AB treatment (9.93 cfu ml −1 ) compared with the GB and RC treatments (2.32 and 1.27 cfu ml −1 , respectively). The multiple pairwise comparisons test (Tukey test) of the Freundlich 1/n f parameter demonstrated a significant difference (p < .05) between the AB treatment and the RC and GB treatments. Similarly, the K f values were significantly (p = .05) higher for the 10-g mass under the same test conditions, but no significant differences were observed in the 0.5-and 1-g masses. This study demonstrated that AB has a higher E. coli adsorption capacity and the potential for mitigating the effects of E. coli O157:H7 transport to surface or groundwater through the soil ecosystem.

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