Cadmium adsorption by natural zeolite in a circular flume

Nasrabadi, Mohsen; Omid, M H; Mazdeh, Ali Mahdavi; Shahriari, Toktam

doi:10.1504/ijetm.2018.097917

Cited by 7 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Until now, many researchers have performed some experiments in the batch reactors (Nasrabadi et al 2020). It should be mentioned that the equlibrium time for the batch experiments is more than those of for flume experiments (Mahdavi et al 2013;Ghoveisi et al 2014;Nasrabadi et al 2017Nasrabadi et al , 2018. The reason is that the turbulence is much more in the batch reactors; however, for the flume experiments the experimental conditions are very close to the natural rivers.…”

Section: Results Of Sorption Experimentsmentioning

confidence: 98%

Effect of cadmium sorption by river sediments on longitudinal dispersion

2021

Self Cite

View full text Add to dashboard Cite

This paper concerns the cadmium sorptive effects by river bed sediments on longitudinal dispersion coefficient in an open-channel flow via experimental and numerical study. For this purpose, a circular flume was used with mean diameter of 1.6 m and a width of 0.2 m. The adsorbing bed was considered as a thin layer of the sediment particles with mean diameter of 0.53 mm and three sediment concentrations of 3, 12, and 20 gr/lit. To determine the sorption parameters of the sediments, some experiments were conducted with three cadmium concentrations of 150, 460, and 770 ppb. Then, the dispersion experiments were carried out with and without the bed sediments with the same cadmium concentration as the sorption experiments. A numerical model was then developed to solve the advection-dispersion equation with considering the sorption term by river bed sediments. The longitudinal dispersion coefficients were estimated by comparing the experimental and numerical breakthrough curves. The results showed that, with increasing the sediment concentrations, the sediment sorption rate increased and the longitudinal dispersion coefficient decreased by about 38, 36 and 33 percent, respectively, for cadmium concentrations of 150, 460 and 770 ppb. In addition, by increasing the cadmium concentrations, the changes in the longitudinal dispersion coefficient are decreased. Furthermore, a relationship was developed using non-dimensional longitudinal dispersion as a function of the new parameter of sorption ratio. From a practical point of view, the results of this study demonstrated that, at the presence of riverbed sediment, the cadmium is longitudinally dispersed with more delay in comparison with no sediment at the river bed.

show abstract

Section: Results Of Sorption Experimentsmentioning

confidence: 98%

Effect of cadmium sorption by river sediments on longitudinal dispersion

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cluster 4 (yellow), "Kinetic of adsorption", consists of nine nodes with 393 cooccurrences, where simulations [98] and various models [99] are applied in kinetic studies [100] to study the adsorption characteristics of NZ to various elements [85]. This cluster presents some keywords that stand out for their occurrence, such as "adsorption", "kinetic", and "isotherm".…”

Section: Author's Keyword Co-occurrence Networkmentioning

confidence: 99%

“…Cluster 6 (light blue) "NZ HM adsorption" has seven nodes (154 co-occurrences); they evaluate the adsorption characteristics of zeolites under various parameters [98] and physical-mechanical properties [116] to solve problems, such as water contaminated with lead and cadmium [117], making use of preferential adsorption for HM classification [109], with keywords "heavy metal", "chabazite", and "phillipsite".…”

Section: Author's Keyword Co-occurrence Networkmentioning

confidence: 99%

Worldwide Research Analysis on Natural Zeolites as Environmental Remediation Materials

et al. 2021

View full text Add to dashboard Cite

Society faces a significant problem in regards to the spread of harmful products in the environment, primarily caused by accelerated growth and resource consumption. Consequently, there is a need for materials to be processed in less harmful ways and to remedy the contaminated sources they generate. Microporous materials have been studied for a long time and are used in waste treatment alternatives. Natural zeolites, on which this study is based, are attractive to the scientific and technological communities, due to their numerous applications as decontaminants and adsorption properties. This study analyzes the intellectual structures of publications related to natural zeolites in environmental remediation, using bibliometric methods to determine their volumes and trends. The methodology comprises of an analysis based on 1582 articles, using VOSviewer software, with data from 1974 to 2020, via the Scopus database. Results reflect a notable increase in publications from the end of the 1990s; the greatest contribution in the area comes from Eurasian countries. The study considers that development in this line of research will continue to increase and serve as a great contribution to preserve the environment in coming years, with themes that focus on water treatment (e.g., drinking water, wastewater, greywater), removal of heavy metals, ammonium, ammonia, and construction.

show abstract

“…Desorption of heavy metal from the sediment particles to the overlaying waters depend on the relative importance of the two counter-active processes of (i) desorption due to complexation with ligands in water medium and/or competition for sorption sites with other cations, and (ii) coagulation, precipitation and flocculation (Chapman and Wang 2001) Voluminous literature is available on the sorption of heavy metals by natural sediments (Gardiner, 1974;Jain and Sharma 2002;Jain and Ram 1997;Mahdavi et al 2008;Mahdavi et al 2013;and Ghoveisi et al 2013;Nasrabadi et al 2017, Nasrabadi et al 2018; however, the study of heavy metal desorption, particularly cadmium ions, from riverine and natural sediments has not received much attention. Allen et al (1995) examined the soil partition coefficients for cadmium ions and the difference between soil partition coefficients obtained from the column desorption and batch adsorption experiments with artificially contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

Study of Cadmium Desorption Kinetics from Riverine Sediments

Nasrabadi

Omid

Mazdeh

2021

Preprint

Self Cite

View full text Add to dashboard Cite

In natural streams, the majority of heavy metal ions are generally associated ‎with ‎sediment particles. Under some environmental conditions, these metal ions may release from ‎the ‎sediment particles.‎ In such conditions, the desorption rate of heavy metals is very important for decision-makers of ‎water quality assessment. In this study, the effect of cadmium desorption ‎from the river bed ‎sediments has been ‎experimentally investigated. Artificially contaminated sediments were used ‎for performing batch desorption ‎experiments. The experiments were conducted by adding 1 gr of contaminated ‎sediment (D50 = 0.53 mm) with a known concentration and shaking until observing a ‎roughly ‎constant cadmium concentration in the solution. It was concluded that the cadmium ions were strongly bond to the river bed sediment; meanwhile, at the ‎equilibrium time, up to about 7 to 29 percent of cadmium ions were ‎released from the‎ artificially contaminated sediments. The experiments were followed by ‎two agitation rates of 100 and 200 rpm. It was revealed that by increasing the flow turbulence, the amount ‎of desorbed cadmium is slightly increased. Besides, the desorption kinetics was evaluated using eight models of Zero-, first-, second-, third-order, ‎parabolic diffusion, double parabolic diffusion, two constant rate, and simple Elovich. The results of the evaluation showed that simple Elovich (with R2 = 0.991), double parabolic diffusion (with R2 = 0.9882), two constant rate (with R2 = 0.983) and parabolic diffusion models (with R2 = 0.846) have respectively the best performance in calculation of Cd desorption rate from the sediments.

show abstract

Cadmium adsorption by natural zeolite in a circular flume

Cited by 7 publications

References 0 publications

Effect of cadmium sorption by river sediments on longitudinal dispersion

Effect of cadmium sorption by river sediments on longitudinal dispersion

Worldwide Research Analysis on Natural Zeolites as Environmental Remediation Materials

Study of Cadmium Desorption Kinetics from Riverine Sediments

Contact Info

Product

Resources

About