Adsorption kinetics of 4-n-nonylphenol on hematite and goethite

Alahmari, Saeed; Watson, K. J.; Fong, B.; Ruyonga, R.M.; Ali, Hashim M.

doi:10.1016/j.jece.2018.05.052

Cited by 14 publications

(4 citation statements)

References 34 publications

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Section: Methodsmentioning

confidence: 99%

“…4NP has been identified as a toxic water pollutant, originating from biodegradation products of cleaning agents, pesticides, and food packaging. 18 As such, its adsorption onto iron oxide, 19,20 carbons, 21 bioadsorbents, 22 clays, 23 magnetic particles, 24 and soils 25 from aqueous solutions has been previously investigated in an attempt to develop effective removal processes. However, as far as the authors know, this work is the first study to focus on 4NP adsorption from nonaqueous solutions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In preparing the isotherms, a ratio, by mass, of approximately 1:2 solid powder to solution was allowed to equilibrate. Kinetic studies indicate that equilibrium was established in approximately 20 h. 19 The solids were separated by centrifugation and the supernatant concentrations were determined through UV/vis spectroscopy and qNMR. The measured intensity was used to give the solution concentration by means of comparison to a calibration curve established from measurements on samples with known concentrations.…”

Section: ■ Introductionmentioning

confidence: 99%

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Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents

et al. 2019

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The adsorption of 4-n-nonylphenol (4NP), carvacrol, and ethanol onto the surface of iron oxide from nonaqueous solutions is presented. It is found that adsorption of 4NP from alkanes is strong and proceeds to monolayer formation, where the molecules are essentially "upright". However, at high relative concentrations, ethanol successfully outcompetes 4NP for the iron oxide surface. Estimates of the enthalpy and entropy of binding of 4NP were found to be exothermic and entropically disfavored. Sum frequency generation vibrational spectroscopy data indicate some evidence of binding through a phenolate anion, despite the nonpolar, nonaqueous solvent. Carvacrol is also found to adsorb as a monolayer where the molecules are lying "flat". The adsorption of ethanol onto iron oxide from dodecane was investigated through the use of quantitative NMR, which is a convenient analytical technique for measuring adsorption isotherms. It was concluded that ethanol does not form adsorbed monolayers on the surface. Instead, it partitions onto the surface as a surface-enhanced local phase separation related to its poor solubility in alkane solvents.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents

et al. 2019

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“…Using sewage sludge in agriculture [ 13 ] can lead to contamination not only of soil, crops, and living organisms, but also of underground waters by leaching and ground waters by run-off [ 14 ]. Due to the high affinity of nonylphenol for some solids, a variety of materials have been used to remove nonylphenols from water by adsorption, including mica [ 8 ], organic polymers [ 9 , 15 ], modified clays [ 16 ], iron oxides [ 17 , 18 ], carbon nanotubes [ 19 ], and graphene oxides [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Nonylphenol Isomers from Water by Use of Organo-Hydrotalcites

Cosano

Esquivel

Romero–Salguero

et al. 2022

IJERPH

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The presence of potent organic endocrine-disrupting chemicals (EDCs) in natural aquifers can have adverse impacts on public health and the environment. 4-nonylphenol, one such EDC, can be efficiently removed from water by adsorption onto a clayey material. In this work, we created an effective sorbent for this purpose by using co-precipitation and subsequent ion-exchange to intercalate the organic anion deoxycholate into a Mg/Al hydrotalcite. Intercalating deoxycholate ions increased the organophilicity of the hydrotalcite surface. The solid was used to adsorb 4-nonylphenol at different pollutant concentrations and temperatures. The adsorption process was subjected to a kinetic study. Based on the results, the EDC was adsorbed by chemisorption. In addition, based on the equilibrium isotherms used for the process, the Freundlich model was the most accurate in reproducing the adsorption of 4-nonylphenol onto deoxycholate-intercalated hydrotalcite.

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Pollution and risk assessment of phenolic compounds in drinking water sources from South-Western Nigeria

Otitoju

Alfred

Olorunnisola

et al. 2023

Environ Sci Pollut Res

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This study reports the occurrence and risk assessment of 2,4-Dinitrophenol (2,4-DNP), Phenol (PHE), and 2,4,4, in drinking water sources in three South western States in Nigeria (Osun, Oyo and Lagos). Groundwater (GW) and surface water (SW) were collected during dry and wet seasons of a year. The detection frequency of the phenolic compounds followed the trend: Phenol > 2,4-DNP > 2,4,6-TCP. The mean concentrations of 2,4-DNP, Phenol, and 2,4,6-TCP in GW/SW samples from Osun State were 639/553 µg L − 1 , 261/262 µg L − 1 , and 169/131 µg L − 1 respectively, during the rainy season and 154/7 µg L − 1 , 78/37 µg L − 1 , and 123/15 µg L − 1 during the dry season. In Oyo state, the mean concentration were 165/391 µgL − 1 for 2,4-DNP and 71/231 µgL − 1 for Phenol in GW/SW samples respectively, during rainy season. Generally, in the dry season, these values decreased. In any case, these concentrations are higher than those previously reported in water from other countries. The concentration of 2,4-DNP in water posed serious ecological risks to Daphnia on the acute scale while it was Algae on the chronic scale. Estimated daily intake and hazard quotient calculations suggests that 2,4-DNP in water pose serious toxicity concern to humans. Additionally, the concentration of 2,4,6-TCP in water from Osun State in both seasons pose signi cant carcinogenic risk to persons ingesting water from this State. Every exposure group were at risk from ingesting these phenolic compounds in water. However, this decreased with increasing age of the exposure group. Results from the Principal Component Analysis indicate that 2,4-DNP in water samples is from an anthropogenic source different from that for Phenol and 2,4,6-TCP. There is a need to treat these GW and SW before drinking while maintaining regular assessment of these water sources.drinking water (Sonawane and Korake, 2016). In Brazil, the Brazilian potability standard for drinking water set the maximum permissible level for 2,4,6-TCP at 200 ng L − 1 (Sartori et al., 2012). However, there is a dearth of data on the presence of these phenolic compounds in water bodies and drinking water sources in Africa, even though these compounds are vastly used in industries and particularly for agricultural purposes in the continent. Consequently, no limit has been determined for these priority pollutants in aquatic environments in West African countries.To make matters worse for millions of Africans, the major sources of drinking water are some of these aquatic environments, including streams, rivers, hand-dug wells and boreholes. In fact it is estimated that > 50% of Africans use groundwater as their primary source of drinking water (https://businessday.ng/opinion/article/world-water-day-2022-where-are-we/ ). Water from these sources is not pre-treated before use. The quality of these drinking water sources from Africa and especially Nigeria, with respect to phenolic compounds is relatively unknown.Based on the observed gaps, this study aims to provide baseline data on the occurrence of some p...

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Adsorption kinetics of 4-n-nonylphenol on hematite and goethite

Cited by 14 publications

References 34 publications

Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents

Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents

Efficient Removal of Nonylphenol Isomers from Water by Use of Organo-Hydrotalcites

Pollution and risk assessment of phenolic compounds in drinking water sources from South-Western Nigeria

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