Novel metal-doped bacteriostatic hybrid clay composites for point-of-use disinfection of water

Unuabonah, Emmanuel I.; Kolawole, Matthew O.; Agunbiade, Foluso O.; Omorogie, Martins O.; Koko, Daniel T.; Ugwuja, Chidinma G.; Ugege, Leonard E.; Oyejide, Nicholas E.; Günter, Christina; Taubert, Andreas

doi:10.1016/j.jece.2017.04.017

Cited by 30 publications

(18 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The current study describes the synthesis of a new porous nanocomposite material. Unlike earlier versions of these materials prepared with alkali activation [1,22], the resulting micro/mesoporous carbon–clay nanocomposite in this study shows a high efficiency for the removal of anionic organic and pathogenic pollutants from water. As in the previous study [1], the starting materials are purified raw kaolinite clay (one of the most abundant materials on earth), Carica papaya seeds, and ZnCl 2 .…”

Section: Introductionmentioning

confidence: 71%

“…Thermogravimetric /differential thermal analysis was performed on a Netzsch STA 449F3 from 25 to 1000 °C at 5 °C/min under N 2 . The point of zero charge (pH pzc ) analysis meant to determine the surface charge of samples prepared was carried out using the salt addition method, as described by Unuabonah et al [22]. Elemental analysis to determine the amount of C, H, and N in the samples was performed with an Elementar Vario EL III elemental analyzer.…”

Section: Methodsmentioning

confidence: 99%

“…Unfortunately, these materials are not effective in the removal of nitrophenol (anionic) pollutants from water. The materials are only able to disinfect water by adsorption without killing the pathogens [22]. The current study shows that these limitations are, however, surmounted by a further modification of the base materials via an improved materials synthesis procedure.…”

Section: Introductionmentioning

confidence: 92%

“…In response to this observation, we have modified the synthesis strategy using microwave irradiation rather than thermal treatment during synthesis. The resulting materials have been successfully used for the removal of phosphates and gram-negative bacteria from aqueous media [21–22].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

Unuabonah¹,

Nöske²,

Weber³

et al. 2019

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

A new micro/mesoporous hybrid clay nanocomposite prepared from kaolinite clay, Carica papaya seeds, and ZnCl2 via calcination in an inert atmosphere is presented. Regardless of the synthesis temperature, the specific surface area of the nanocomposite material is between ≈150 and 300 m2/g. The material contains both micro- and mesopores in roughly equal amounts. X-ray diffraction, infrared spectroscopy, and solid-state nuclear magnetic resonance spectroscopy suggest the formation of several new bonds in the materials upon reaction of the precursors, thus confirming the formation of a new hybrid material. Thermogravimetric analysis/differential thermal analysis and elemental analysis confirm the presence of carbonaceous matter. The new composite is stable up to 900 °C and is an efficient adsorbent for the removal of a water micropollutant, 4-nitrophenol, and a pathogen, E. coli, from an aqueous medium, suggesting applications in water remediation are feasible.

show abstract

Section: Introductionmentioning

confidence: 71%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

Unuabonah¹,

Nöske²,

Weber³

et al. 2019

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It was used in preparing the materials utilised in this study, and it is not in any way harmful to human health in the event that it leaches into solution. An initial study of the analysis of Zn in water treated with Zn modified hybrid clay material suggests that the amount of Zn leached into treated water is far below WHO standard limit for Zn in drinking water [25] . Alum, on the other hand, has been used as a flocculant in water treatment but is used as a cheap source of Aluminium (Al) in this study in order to study the influence of Al in the composite on the removal of harmful pathogens from water.…”

Section: Introductionmentioning

confidence: 99%

Disinfection of water with new chitosan-modified hybrid clay composite adsorbent

Unuabonah

Adewuyi

Kolawole

et al. 2017

Heliyon

Self Cite

View full text Add to dashboard Cite

Hybrid clay composites were prepared from Kaolinite clay and Carica papaya seeds via modification with chitosan, Alum, NaOH, and ZnCl2 in different ratios, using solvothermal and surface modification techniques. Several composite adsorbents were prepared, and the most efficient of them for the removal of gram negative enteric bacteria was the hybrid clay composite that was surface-modified with chitosan, Ch-nHYCA1:5 (Chitosan: nHYCA = 1:5). This composite adsorbent had a maximum adsorption removal value of 4.07 × 106 cfu/mL for V. cholerae after 120 min, 1.95 × 106 cfu/mL for E. coli after ∼180 min and 3.25 × 106 cfu/mL for S. typhi after 270 min. The Brouers-Sotolongo model was found to better predict the maximum adsorption capacity (qmax) of Ch-nHYCA1:5 composite adsorbent for the removal of E. coli with a qmax of 103.07 mg/g (7.93 × 107 cfu/mL) and V. cholerae with a qmax of 154.18 mg/g (1.19 × 108 cfu/mL) while the Sips model best described S. typhi adsorption by Ch-nHYCA1:5 composite with an estimated qmax of 83.65 mg/g (6.43 × 107 cfu/mL). These efficiencies do far exceed the alert/action levels of ca. 500 cfu/mL in drinking water for these bacteria. The simplicity of the composite preparation process and the availability of raw materials used for its preparation underscore the potential of this low-cost chitosan-modified composite adsorbent (Ch-nHYCA1:5) for water treatment.

show abstract

A review on the versatility of Carica papaya seed: an agrogenic waste for the removal of organic, inorganic and microbial contaminants in water

Bayode

Anthony

Ore

et al. 2023

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

The advent of civilization, coupled with growing industrialization in many countries, is placing more demand on the available water sources. At the same time, the daily surge in wastes generated by man's anthropogenic activities has led to microbial, organic and inorganic contamination of water sources. Based on available evidence, significant research efforts are being made into the use of low‐cost agricultural materials such as Carica papaya seed (CPS) in the removal of these contaminants from water sources in a bid to provide clean water. In the present review, the organic, inorganic and microbial contaminants in waters were elucidated. Furthermore, the chemical composition of the CPS was illustrated. The adsorption capacity and efficiency of CPS and their composites in the remediation of the selected contaminants were discussed while identifying the various factors affecting the adsorption efficiency. Finally, the reusability of this agricultural material was discussed. Solution pH was identified as a major factor influencing the sorption process. The high removal efficiency reported in the studies that adopted CPS showed its vast potential in the elimination of contaminants from water sources. Also, the regenerative potential of the adsorbent over several cycles indicated its long‐term use. The economic feasibility and environmental sustainability afforded by using CPS chart a path for further investigation into the use of other low‐cost agricultural materials in the elimination of environmental contaminants. © 2023 Society of Chemical Industry (SCI).

show abstract

Novel metal-doped bacteriostatic hybrid clay composites for point-of-use disinfection of water

Cited by 30 publications

References 48 publications

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

Disinfection of water with new chitosan-modified hybrid clay composite adsorbent

A review on the versatility of Carica papaya seed: an agrogenic waste for the removal of organic, inorganic and microbial contaminants in water

Contact Info

Product

Resources

About