Estimation of equilibrium times and maximum capacity of adsorption of heavy metals by E. crassipes (review)

Sayago, Uriel Fernando Carreño; Castro, Yineth Piñeros; Rivera, Laura Rosa Conde; Mariaca, Alexander García

doi:10.1007/s10661-019-8032-9

Cited by 35 publications

(26 citation statements)

References 75 publications

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“…The dimensionless thermodynamic equilibrium constant was computed using the adsorption equilibrium constant as in Kegl et al (2019) and Kegl et al (2020) but modified to our study as Eq. (8) before computing the associated thermodynamic parameters using equations from (9, 10, 11) (El-Aila et al, 2016;El-Naggar et al, 2019;Gao et al, 2020;Kumar, 2014;Sayago et al, 2020).…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…(2) and (4) as well as the equilibrium relationship, Eq. (5) ( El-Aila et al., 2016 ; Gao et al., 2020 ; Kumar, 2014 ; Sayago et al., 2020 ).…”

Section: Experimental Workmentioning

confidence: 99%

“…The adsorption studies can be quantified by many parameters and one of them is the adsorption efficiency, which we used in this study ( Kumar, 2014 ; Sayago et al., 2020 ):

…”

Section: Experimental Workmentioning

confidence: 99%

“…One of the socio-economic challenges we face in the present day world is access to fresh water for human consumption and industrial purposes. Our fauna and flora especially in Southern Africa have also succumbed to the diminishing levels of this basic natural resource ( Sayago et al., 2020 ). Global warming increase in small and medium enterprises (SMEs), absence of child birth policies, persistent droughts and over population ( Singh et al., 2013 ) are amongst many other factors, that have contributed to this challenge, mainly in Africa.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of metal ions like lead, arsenic and chromium in potable water and/or wastewater, has been associated with different cancers like skin cancer, lung cancer, kidney cancer among others ( Li et al., 2020 ). Besides being carcinogenic, metals like lead and chromium have also been reported as potential teratogens as well as mutagens ( Sayago et al., 2020 ). Lead is also highly toxic and it has been linked to various health problems like brain damage, mental disturbances, retardation and reduction in the production of haemoglobin.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of lead ions from wastewater using nano silica spheres synthesized on calcium carbonate templates

Manyangadze

Chikuruwo

Narsaiah

et al. 2020

Heliyon

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Lead is a heavy metal that is bio accumulative and non-biodegradable that poses a threat to our health when it exists in excess in our bloodstream. It has found its way into wastewater from mostly chemical industrial processes. In this article, we investigated the adsorption and hence removal of lead (II) ions from wastewater in order to purify it for re-use in industrial processes or for plant and animal use. We synthesized nano silica hollow spheres (NSHS) and used them as adsorbents to remove lead ions from wastewater. When we characterized the NSHS using X-Ray diffraction, the amorphous nature of silica was evident with average crystal size of 39.5 nm. Scanning electron microscopy was used to determine the morphology of the adsorbent and the particles were found to be spherical in shape within a size range of 100-200 nm. Thermogravimetric analysis was used to determine the mass loss of NSHS which was~2% at 800 C. Our experimental results from adsorption studies showed that there was a linear relationship between temperature (27-60 C) and adsorption efficiency and an inverse relationship between initial metal concentration (50-300 mg/L) and adsorption efficiency. At a maximum temperature of 60 C and maximum initial metal concentration of 300 mg/L, the adsorption capacity was 200 mg/g and 262 mg/g, respectively while the adsorption efficiency was 99.6% and 87.4%, respectively. Our equilibrium and thermodynamic results revealed that the process was better modelled by the Langmuir adsorption isotherm (q max ¼ 266.89 mg/g and b ¼ 0.89 L/mg). The adsorption process was both endothermic (ΔH ¼ 97 kJ/mol) and spontaneous (ΔG ¼-22 kJ/mol). We can conclude that we were able to successfully synthesize NSHS, use them to remove lead (II) ions and the produced NSHS have a capacity that is higher than most other adsorbents investigated by other researchers.

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Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…(2) and (4) as well as the equilibrium relationship, Eq. (5) ( El-Aila et al., 2016 ; Gao et al., 2020 ; Kumar, 2014 ; Sayago et al., 2020 ).…”

Section: Experimental Workmentioning

confidence: 99%

“…The adsorption studies can be quantified by many parameters and one of them is the adsorption efficiency, which we used in this study ( Kumar, 2014 ; Sayago et al., 2020 ):

…”

Section: Experimental Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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