Evaluation of Sonocatalytic and Photocatalytic Processes Efficiency for Degradation of Humic Compounds Using Synthesized Transition-Metal-Doped ZnO Nanoparticles in Aqueous Solution

Maleki, Afshin; Seifi, Mehran; Marzban, Nader

doi:10.1155/2021/9938579

Cited by 4 publications

(8 citation statements)

References 48 publications

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“…In order to validate the mathematical model developed in this study, data from several literature studies concerning HA degradation by ZnO- and TiO 2 -based catalysts were collected (mainly via photocatalysis). Maleki et al (2021) synthesized ZnO nanoparticles doped with copper and manganese for photocatalytic removal of humic substances . The experimental results of this study and the respective predictions of the present model are illustrated in Figure .…”

Section: Results and Discussionmentioning

confidence: 68%

“…Maleki et al ( 2021) synthesized ZnO nanoparticles doped with copper and manganese for photocatalytic removal of humic substances. 23 The experimental results of this study and the respective predictions of the present model are illustrated in Figure 1.…”

Section: Resultsmentioning

confidence: 89%

“…Given that the effect of the initial HA concentration on catalytic efficiency was observed in sono-and photocatalysis, the model was applied for both processes. 19,23 The modeling study that generated the results shown in Figures 1 and 2 was also applied to other cases reported in the literature, totaling 14 references and 60 experiments. 9−11,13,17−21,23,25−28 Additional model fittings can be found in the Supporting Information (Figures S1−S3 and Table S1).…”

Section: Resultsmentioning

confidence: 99%

“…It is not the aim of the present model to describe the mechanisms in detail but rather to represent the global reactions of HA degradation. Given that the effect of the initial HA concentration on catalytic efficiency was observed in sono- and photocatalysis, the model was applied for both processes. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…Figure1. Fits of the model to ZnO-based photocatalysis data 23. The legend represents the initial HA concentration (mg L −1 ).…”

mentioning

confidence: 99%

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Modeling of Catalyst Deactivation in Humic Acid Degradation

Aguiar

Siqueira

2022

Ind. Eng. Chem. Res.

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A kinetic model is proposed to describe humic acid (HA) degradation by TiO 2 -and ZnO-based catalysts taking into account the effects of adsorption and catalyst deactivation. The model was written in Scilab and validated with data from 14 references and 60 experiments, providing an R 2 value of 0.925. The induction time observed in some experiments was also considered in the model, improving predictions. The rate constant for HA degradation showed feasible values compared with the first-order kinetic constants found in the literature. This parameter indicated that the efficiency of TiO 2 -based catalysts was slightly higher than that of ZnO-based catalysts. For experiments using a minimum of 100 mg L −1 catalyst, the average specific rates of 1.18 × 10 −4 and 3.27 × 10 −3 L mg −1 min −1 were found for HA degradation and catalyst deactivation, respectively. Furthermore, the analytical solution of the model provided an equation to determine the maximum HA degradation as a function of initial experimental conditions.

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Section: Results and Discussionmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

“…Figure1. Fits of the model to ZnO-based photocatalysis data 23. The legend represents the initial HA concentration (mg L −1 ).…”

mentioning

confidence: 99%

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Modeling of Catalyst Deactivation in Humic Acid Degradation

Aguiar

Siqueira

2022

Ind. Eng. Chem. Res.

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Changes in Selected Organic and Inorganic Compounds in the Hydrothermal Carbonization Process Liquid While in Storage

et al. 2023

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Although many studies have investigated the hydrothermal transformation of feedstock biomass, little is known about the stability of the compounds present in the process liquid after the carbonization process is completed. The physicochemical characteristics of hydrothermal carbonization (HTC) liquid products may change over storage time, diminishing the amount of desired products or producing unwanted contaminants. These changes may restrict the use of HTC liquid products. Here, we investigate the effect of storage temperature (20, 4, and −18 °C) and time (weeks 1–12) on structural and compositional changes of selected organic compounds and physicochemical characteristics of the process liquid from the HTC of digested cow manure. ANOVA showed that the storage time has a significant effect on the concentrations of almost all of the selected organic compounds, except acetic acid. Considerable changes in the composition of the process liquid took place at all studied temperatures, including deep freezing at −18 °C. Prominent is the polymerization of aromatic compounds with the formation of precipitates, which settle over time. This, in turn, influences the inorganic compounds present in the liquid phase by chelating or selectively adsorbing them. The implications of these results on the further processing of the process liquid for various applications are discussed.

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A systematic review of photocatalytic degradation of humic acid in aqueous solution using nanoparticles

Derakhshani

Naghizadeh

Arab‐Zozani

et al. 2022

Reviews on Environmental Health

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Objectives Humic acid (HA) compounds in the disinfection processes of drinking water and wastewater are considered as precursors of highly toxic, carcinogenic and mutagenic disinfectant by-products. The aim of this study was to systematically review all research studies on the photocatalytic degradation of humic acid and to evaluate the laboratory conditions and results of these studies. Content The present systematic review was performed by searching the Scopus, PubMed, and web of science databases until December 2021. The parameters of type of catalyst, catalyst size, optimum pH, optimum initial concentration of humic Acid, optimum catalyst concentration, optimum time, light used and removal efficiency were investigated. Summary 395 studies were screened and using the inclusion and exclusion criteria, in total, 20 studies met our inclusion criteria and provided the information necessary to Photocatalytic degradation of humic acid by nanoparticles. In the investigated studies, the percentage of photocatalytic degradation of humic acid by nanoparticles was reported to be above 70%, and in some studies, the removal efficiency had reached 100%. Outlook From the results of this systematic review, it was concluded that the photocatalytic process using nanoparticles has a high effect on the degradation of humic acid.

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Evaluation of Sonocatalytic and Photocatalytic Processes Efficiency for Degradation of Humic Compounds Using Synthesized Transition-Metal-Doped ZnO Nanoparticles in Aqueous Solution

Cited by 4 publications

References 48 publications

Modeling of Catalyst Deactivation in Humic Acid Degradation

Modeling of Catalyst Deactivation in Humic Acid Degradation

Changes in Selected Organic and Inorganic Compounds in the Hydrothermal Carbonization Process Liquid While in Storage

A systematic review of photocatalytic degradation of humic acid in aqueous solution using nanoparticles

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