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Abstract

An adsorber in which sorption processes occur is one of the key components of an adsorption chiller. Precise real-time monitoring of and supervision over these processes are particularly important to ensure their proper execution. The article describes the experimental stand used for the measurement of the adsorber’s operating parameters and analyses pressure measurement uncertainties, taking into account the impact of the temperature on the test system filled with the adsorbent in the form of silica gel, while concurrently considering the influence of other factors (e.g. the environment, the A/A, and A/D conversion, or data processing) on measurement uncertainties. A complex analysis of uncertainties was carried out, including the results of the statistical analysis of the measurement data obtained from long-term experimental tests of the object and the uncertainties of the pressure measuring chain by the type B method, involving the consideration of interactions between the system components and the temperature impact on the propagation of uncertainties. As part of the analysis, the characteristic stages of the data collection and processing operations related to the sampling rate and measurement intervals were separated. The article presents the prototype test stand and original pressure measurement system for the verification of a single-bed adsorber working below10 hPa.The novel construction of a single-bed adsorberwas used as a test object. Furthermore, in this paper, the developed algorithm of the research method implemented in the system was discussed and positively verified.
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Authors and Affiliations

Mirosław Cezary Neska
1
Tadeusz Andrzej Opara
2

  1. Łukasiewicz Research Network – Institute for Sustainable Technologies, K. Pułaskiego 6/10, 26-600 Radom, Poland
  2. Kazimierz Pulaski University of Technology and Humanities, Stasieckiego 54, 26-600 Radom, Poland
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Abstract

Fixed beds were adopted for removal of organic dye from water by photocatalytic decomposition or adsorption. To this end, macroporous titania or silica micro-particles were synthesized from emulsions as micro-reactors and packed in the bed. During feeding aqueous methylene blue solution, UV light was irradiated for generation of active radicals for removal of dye by photocatalytic decomposition. Porous silica particles were also used as adsorbents in the bed for continuous adsorption of organic dye. For regeneration of the porous titania or silica particles, rinsing with fresh water was carried out before repeated cycles.
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Authors and Affiliations

Young-Sang Cho
1
ORCID: ORCID
Sohyeon Sung
1
ORCID: ORCID

  1. Tech University of Korea, Department of Chemical Engineering and Biotechnology, 15073, 237 Sangidaehak-ro, Siheung-si, Korea
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Abstract

This article focuses on discussing the adsorption process of phenol and its chloro-derivatives on the HDTMA-modified halloysite. Optimized chemical structures of phenol, 2-, 3-, 4-chlorophenol, 2,4-dichloro-, and 2,4,6-trichlorophenol were obtained with computational calculation (the Scigress program). Charge distributions and the hypothetical structure of the system HDTMA-modified halloysite are among their key features. The above-mentioned calculations are applied in order to explain adsorption mechanism details of chlorophenols on the HDTMA-modified halloysite in aqueous solutions. The results of electron density distribution and solvent accessible surface area calculations for phenol and chlorophenols molecules illustrate the impact of chlorine substitution position in a phenol molecule, both on the mechanism and the kinetics of their adsorption in aqueous solutions. Experimental adsorption data were sufficiently represented using the Langmuir multi-center adsorption model for all adsorbates. In addition, the relations between adsorption isotherm parameters and the adsorbate properties were discussed. This study also targets at explaining the role of meta position as a chlorine substituent for mono-chloro derivatives. Given the above findings, two possible mechanisms were utilized as regards chlorophenol adsorption on the HDTMA-modified halloysite, i.e., electrostatic and partition interactions when the chlorophenols exist in a molecular form.
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Bibliography

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Authors and Affiliations

Beata Szczepanik
1
Anna Kołbus
1
Piotr Słomkiewicz
1
Marianna Czaplicka
2
ORCID: ORCID

  1. Institute of Chemistry, Jan Kochanowski University, Kielce, Poland
  2. Institute of Environmental Engineering Polish Academy of Sciences, Zabrze, Poland
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Abstract

The aim of the study was to use regenerated activated carbon to adsorb phenol from a river. Coconut shell activated carbon was derived from used tap water filter cartridges. The activated carbon was carbonised and then activated with KOH at 200°C, under a nitrogen atmosphere. The resulting adsorbent was characterised on the basis of nitrogen adsorption by Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) analysis and point of zero charge (pH PZC). The study of periodic adsorption included kinetic and equilibrium modelling, determined the effect of solution pH on efficiency and the possibility of regeneration and reuse of the adsorbent. The efficiency of phenol removal from model water was evaluated, followed by the possibility of their adsorption from a polluted river in Silesia Province. Phenol adsorption followed pseudo-second-order kinetics. The adsorbents showed high adsorption abilities, as determined by the Langmuir isotherm model. The model fits the experimental data well. The concentration of phenol in the river was in the range of 0.45–0.77 mg∙dm– 3, which means that its value was at least five times higher than the standard values. The use of regenerated activated carbon from waste filter cartridges removed phenol from the river by 78% using optimal test parameters.
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Authors and Affiliations

Anna Marszałek
1
ORCID: ORCID
Ewa Puszczało
1
ORCID: ORCID

  1. Silesian University of Technology, Faculty of Energy and Environmental Engineering, Konarskiego St, 18, 44-100 Gliwice, Poland
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Abstract

This work aimed to evaluate the yam peel in a bed column packaged as a chromium(VI) ion adsorbent in an aqueous solution. Yam peel was used as adsorbent, prior washing, drying, size reduction, and selection. The experimental work consisted in determining the effect of bed depth, particle size, and temperature, keeping inlet flow = 0.75 cm 3∙s –1, pH = 2 and initial concentration of 100 mg∙dm –3. The Adsorption Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDS) analysis on yam ( Dioscorea rotundata) peel showed a heterogeneous, porous structure, with functional groups characteristic in lignocellulosic materials. It was analysed regarding the influence of temperature, bed height, and adsorbent particle size on the removal efficiency; it was found that the decrease of particle size and the increase of the bed height favour the elimination of the metallic ion, with removal rates between 92.4 and 98.3%. The bed maximum adsorption capacity was 61.75 mg∙g –1, and break time of 360 min. The break curve’s adjustment to the Thomas, Yoon–Nelson, Dose–Response and Adams–Bohart models was evaluated, concluding that the Yoon–Nelson and Dose–Response models best described the behaviour of the break curve with a coefficient of determination ( R2) of 0.95 and 0.96, respectively. The results show that the bio-adsorbent studied can be used to eliminate Cr(VI) in a continuous system.
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Authors and Affiliations

Ángel Villabona-Ortíz
1
ORCID: ORCID
Candelaria Tejada-Tovar
1
ORCID: ORCID
Rodrigo Ortega Toro
2
ORCID: ORCID
Keily Peña-Romero
1
ORCID: ORCID
Ciro Botello-Urbiñez
1

  1. Universidad de Cartagena, Department of Chemical Engineering, Cartagena de Indias, Colombia
  2. Universidad de Cartagena, Department of Food Engineering, Av. del Consulado # 30 St., No. 48 152 Cartagena, Cartagena de Indias, Bolívar Cartagena de Indias, Colombia
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Abstract

A new composite adsorbent was prepared by modifying low cost local adsorbent (LCL) using MgFe layered double hydroxide (LDH). This low cost local adsorbent was also prepared from the activation of date palm leaf derived from agricultural waste. In comparison to the low LCL, the adsorption capacity of the new composite adsorbent (LCL/MgFe-LDH) was improved. This was measured in terms of its ability to remove lead from wastewater. The Scanning electron microscope (SEM), Energy dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR) and the specific surface area by the (Brunauer, Emmett and Teller) theory (BET) tests were conducted for the characterisation of LCL and LCL/MgFe-LDH. The behaviour of the lead adsorption processes by using LCL/MgFe-LDH as adsorbent was investigated in batch experiments by examining different values of solution pH, contact time, adsorbent dose and initial Pb2+ concentration. High removal efficiency was exhibited by LCL/MgFe-LDH, a value almost double that of LCL. This was attributed to the increase in surface area of LCL/MgFe-LDH (79.7 m2·g–1) in contrast to the surface area of LCL (24.5 m2·g–1). The Freundlich equations and pseudo-second-order kinetics model were appropriate for the provision of adsorption equilibrium data for Pb2+ on adsorbents. These results reveal the great potential of the new composite adsorbent (LCL/MgFe-LDH) if applied to the absorption of heavy metal ions.

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Authors and Affiliations

Hayder M. Abdul-Hameed
Maad F. Al Juboury
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Abstract

This work summarises investigations focused on the photoanode impact on the photovoltaic response of dye-sensitized solar cells. This is a comparison of the results obtained by the authors’ research team with literature data. The studies concern the effect of the chemical structure of the applied dye, TiO2 nanostructure, co-adsorbents addition, and experimental conditions of the anode preparation. The oxide substrates were examined using a scanning electron microscope to determine the thickness and structure of the material. The TiO2 substrates with anchored dye molecules were also tested for absorption properties in the UV-Vis light range, largely translating into current density values. Photovoltaic parameters of the fabricated devices with sandwich structure were obtained from current-voltage measurements. During tests conducted with the N719 dye, it was found that devices containing an 8.4 µm thick oxide semiconductor layer had the highest efficiency (5.99%). At the same time, studies were carried out to determine the effect of the solvent and it was found that the best results were obtained using an ACN : tert-butanol mixture (5.46%). Next, phenothiazine derivatives (PTZ-1–PTZ-6) were used to prepare the devices; among the prepared solar cells, the devices containing PTZ-2 and PTZ-3 had the highest performance (6.21 and 6.22%, respectively). Two compounds designated as Th-1 and M-1 were used to prepare devices containing a dye mixture with N719.
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Authors and Affiliations

Paweł Gnida
1
ORCID: ORCID
Aneta Slodek
2
ORCID: ORCID
Ewa Schab-Balcerzak
2 1
ORCID: ORCID

  1. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sklodowska St., 41-819 Zabrze, Poland
  2. Institute of Chemistry, University of Silesia, 9 Szkolna St., 40-006 Katowice, Poland
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Abstract

Arsenic is one of the most harmful pollutants in groundwater. In this paper, the Nepali bio sand filter (BSF) was modi-fied with different bio-adsorbents, and proved to be an efficient method for arsenic removal from groundwater. Three dif-ferent bio-adsorbents were used to modify the Nepali BSF. Iron nails and biochar BSF, ~96% and ~93% arsenic removal was achieved, within the range of WHO guidelines. In iron nails, BSF and biochar BSF ~15 dm3∙h–1 arsenic content water was treated. In the other two BSFs, rice-husk and banana peel were used, the arsenic removal efficiency was ~83% of both BSFs. Furthermore, the efficiency of rice-husk and banana peel BSFs can be increased by increasing the surface area of the adsorbent or by reducing the flow rate.

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Authors and Affiliations

Ghulam S. Keerio
1
Hareef A. Keerio
2
ORCID: ORCID
Khalil A. Ibuphoto
3
Mahmood Laghari
1
Sallahuddin Panhwar
4
Mashooque A. Talpur
5

  1. Sindh Agriculture University, Department of Energy and Environment, Tandojam, Pakistan
  2. Hanyang University, Department of Civil and Environmental Engineering, Seoul, South Korea
  3. Sindh Agriculture University, Department of Farm Structures, Tandojam, Pakistan
  4. Mehran University of Engineering and Technology, US-Pakistan Centers for Advanced Studies in Water, Jamshoro, Pakistan
  5. Sindh Agriculture University, Department of Irrigation and Drainage, Tandojam, Pakistan
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Abstract

In the present study, basic red 9 had been removed from synthetic waste water using animal waste. Cow dung ash had been prepared and characterized by scanning electron microscope. Morphology analysis shows very fine particles of less than 1 μm. The pH analysis study favours a pH of 8.5 for maximum dye removal. The removal of basic red 9 was very fast on cow dung ash. Percentage dye removal was 80.24% and 95.24 in 5 minutes and 90 minutes, respectively at initial dye concentration of 10 ppm.
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Authors and Affiliations

Raj Kumar Arya
1
Ghanshyam Meena
2 3
Devyani Thapliyal
1
Sanghamitra Barman
4
Gopinath Halder
5
Pooja Shandilya
6

  1. Dr. B.R. Ambedkar National Institute of Technology, Department of Chemical Engineering, Jalandhar,144011, Punjab, India
  2. Jaypee University of Engineering and Technology, Guna, 473226, Madhya Pradesh, India
  3. National Fertilizers Ltd., Bathinda, Punjab-151003, India
  4. Thapar Institute of Engineering and Technology, Department of Chemical Engineering, Patiala, 147004, Punjab, India
  5. National Institute of Technology Durgapur, Department of Chemical Engineering, M. G. Avenue, Durgapur-713209, West Bengal, India
  6. Shoolini University, School of Advanced Chemical Sciences, Solan HP, 173229, India

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