Figure - available from: Materials Advances
This content is subject to copyright. Terms and conditions apply.
Morphology of a metal oxide-based adsorbent, ZnV2O4 hollow spheres [Reprinted with permission from ref. 223. Copyright 2011, Elsevier]
Source publication
The rapid increase in toxic dye wastewater generated from various industries remains a severe public health issue and prime environmental protection concern, posing a major challenge to existing conventional water treatment systems. Consequently, various physicochemical and biological treatment processes have been studied, which exhibit varying rem...
Similar publications
Peoples’ livelihood and environmental governance are interrelated and interact with each other, which is a new starting point for the study of sustainable development of urban agglomerations. Given the insufficient research on the combination of peoples’ livelihood and environment in urban agglomerations. Therefore, this study analyzes the coupling...
Citations
... Maintaining a healthy and clean environment is one of the important scientific concerns in the modern era [8,9]. Pollution of surface and deep water by thousands of organic waste product (synthetic dyes, hormones, antibiotics, other drugs, pesticides, fungicides, etc.) coming from different activities is one of the most important global problems [10,11]. The subject of emerging agriculture and industrial pollutants is a public health concern owing to the high toxicity and stability of these chemical compounds [12,13]. ...
In this study, Al/Cu incorporated NiO nanostructures was acted as a new active photocatalyst for purification of wastewater. The efficient sol gel method was used to prepare pure and Al/Cu incorporated NiO samples with formula of NiO, Ni0.95Al0.03Cu0.02O and Ni0.93Al0.03Cu0.04O. The analysis of crystal structure verified the formation of cubic NiO structure for the different synthesized powders. The TEM images of pure and Al/Cu codoped NiO powders demonstrated the production of nanosized spherical particles have uniform size within 15–17 nm. The insertion of Al/Cu ions transferred the UV absorption edge of pure NiO nanopowder towards the direction of low energy (visible light side) which is very advantage for the photocatalytic applications. The catalyst with high concentration of Cu dopant (Ni0.97Al0.03Cu0.04O) has shown fast removal activities for rhodamine b (RhB), and reactive black 5 (RB5) and chlorpyrifos contaminants with high degradation efficiency (94–98%) during 30 min of sunlight radiation. Besides, the catalyst exhibited a complete mineralization of RhB, RB5 and chlorpyrifos pollutants to CO2 and H2O with high stability for many cycles.
Graphical Abstract
... The development of eco-friendly and cost-effective methods for removing MB dye from wastewater has received significant attention worldwide [7]. Various techniques, such as membrane filtering, photocatalytic degradation, advanced oxidation, liquid-liquid extraction, ozonation, adsorption, and biosorption, have been employed to treat wastewater containing dyes [8][9][10]. Recently, there has been a significant interest in utilizing solar energy for the degradation of pollutants through photocatalytic reduction, as a means to address the environmental cleanup of harmful substances [11]. ...
In this study, sodium titanium oxide (Na2Ti3O7, termed STO) and sodium titanate/zinc oxide (STO/ZnO) photocomposites were prepared for the first time. A low-cost hydrothermal technique was employed to fabricate the STO/ZnO photocomposites with varying ZnO weight ratios: STO/0.25ZnO, STO/0.5ZnO, and STO/ZnO. The prepared photocomposites were investigated for the decomposition of methylene blue dye (MB) under natural visible light illumination and an artificial tungsten halogen lamp. The STO/ZnO photocomposite exhibits high photodegradation performance, which can be correlated with its properties and characterization. The X-ray diffraction analysis reveals that STO has an average crystallite size of 69.1 nm, ZnO has an average crystallite size of 41.4 nm, and the combination of STO/ZnO results in a reduced average crystallite size of 39.5 nm. The bandgap (E g) of STO/ZnO is 2.53 eV after controlling the ZnO weight ratio. The photocatalytic efficiency of the STO/ZnO photocomposite was 100% for MB within 60 min of solar light irradiation, compared to 33.7% for STO and 25.8% for ZnO. The effect of STO/ZnO dosage and MB concentration was investigated. Furthermore, the kinetics and mechanisms of the photocatalytic process were examined. The results suggest that STO/ZnO has promising potential for practical applications in wastewater treatment.
... NaBH 4 is a well-known reducing agent. Removal of organic dyes by NaBH 4 in the nonexistence of an adsorbent is kinetically not easy but thermodynamically favorable [5]. As a possible alternative, adsorption of organic pollutants was employed with nanoparticles such as Fe 3 O 4 , Ag and Cu nanoparticles due to their cost efficiency [6][7][8][9][10]. ...
The treatment of toxic organic pollutants is extremely important for the conservation of clean air, soil, and water. In this study, (reduced graphene oxide) NiCo2O4/ rGO hybrid nanocomposite was prepared by a facile hydrothermal technique and employed for organic dye adsorption from wastewater. The synthesized NiCo2O4/rGO hybrid nanocomposite was studied using FTIR, XRD, SEM, TEM, BET, Raman spectroscopy, and UV–visible. The physical characterizations prove the deposition of NiCo2O4 particles on the rGO surface. The transmission electron microscope image demonstrated that the NiCo2O4 particles with an average size of ∼46 nm was dispersed on the rGO surface. The obtained nanoparticles show a higher specific surface area of 56.4 m² g⁻¹. Adsorption dynamics as investigated by time and concentration variation show that the adsorption data follows pseudosecond order kinetics and the Langmuir isotherm model, with a maximum adsorption capacity of 106.2 mg g⁻¹, indicating homogeneous physiochemical adsorption of CR dye on the adsorbent surface. Besides, the catalytic effectiveness of synthesized nanocomposite towards Congo red (CR) dye reduction mediated by the electron (e⁻) transfer route of BH4 ⁻ ions was explained in detail. The electrostatic interaction used between the NiCo2O4/rGO hybrid composite and Congo red increased the adsorption ion effectiveness of the dye sample.
... Dyes present significant environmental challenges due to their toxicity, resistance to natural degradation, and impact on water bodies [1,2]. Industrial dyes often contain harmful chemicals that endanger humans and aquatic life. ...
This study investigated the use of chicken egg white (CEW) waste immobilized on weak acidic nanofiber membranes for removing the anionic acid orange 7 (AO7) dye in batch and continuous flow modes. Different experiments were conducted to evaluate the effectiveness of CEW-modified nanofiber membranes for AO7 removal, focusing on CEW immobilization conditions, adsorption kinetics, and thermodynamics. The CEW-modified nanofiber membrane (namely NM-COOH-CEW) exhibited a maximum AO7 adsorption capacity of 589.11 mg/g within approximately 30 min. The Freundlich isotherm model best represented the equilibrium adsorption data, while the adsorption kinetics followed a pseudo-second-order rate model. Breakthrough curve analysis using the Thomas model and the bed depth service time (BDST) model showed that the BDST model accurately described the curve, with an error percentage under 5%. To investigate AO7 elution efficiency, different concentrations of organic solvents or salts were tested as eluents. The NM-COOH-CEW nanofiber membrane exhibited promising performance as an effective adsorbent for removing AO7 dye from contaminated water.
... Excellent and promising adsorbent should, in general, be able to be recycled and reused in order to satisfy the demand for cheapness [46]. Moreover, it must have a large capacity for adsorption. ...
In this study, three alternative techniques were used to recycle expanded polystyrene waste (WPS). Sulfonated polystyrene (PSS)-based materials (PSS-01, PSS-02, and PSS-03) were produced and employed as efficient and reasonably priced adsorbents. The findings demonstrated that the clearance efficiency of expanded polystyrene increased from 13.6% for pH = 3 to 21% at pH = 9. The removal capacity for sulfonated polystyrenes, which varied from 60% to 85% and 98% for PSS-01, PSS-02, and PSS-03, respectively, did not alter over the pH range. Furthermore, the removal effectiveness of the sulfonated polystyrenes was unaffected by increasing the starting dye concentration. However, for a methylene blue (MB) concentration of 200 mg l-1 , the removal capacity employing PSS-02 significantly decreased and fell to less than 62%. The elimination rate of the dye by PSS-03 at the ideal contact duration of 15 min was more incredible than 98.2% at the ideal amount of 20 mg. Undoubtedly, the results showed that MB adsorption corresponded to the Langmuir isotherm for WPS and PSS-02 and the Freundlich isotherm for PSS-01 and PSS-03, and adsorption kinetic models for the three copolymers produced pseudo-second order. PSS-03's adsorption capability increased because of its hydrophilic sites and higher adsorbent surface area.
... Consequently, a range of interactions are proposed for the adsorption-based dye removal process, such as ion exchange, hydrogen bonding, π-π interactions, and electrostatic interactions. On the surface of activated carbons, physisorption which includes hydrogen bonding, π-π interactions, and electrostatic interactions-is the proposed adsorption process for MB and BB (Dutta et al., 2021;Kanwal et al., 2023). In the semi-alkaline pH of MB dye, the surface charge of carbon nanostructure is often negatively charged, which allows it to interact with positively charged MB with ease mode. ...
... To get different concentrations of dye solution, ranging from 10 mg.L -1 to 100 mg.L -1 , the standard solution was diluted with distilled water. Reactive blue dye was discovered to have a maximum wavelength (max) of 580 nm (Dutta et al. 2021). Reactive blue dye was analyzed colorimetrically to quantify the concentration of the dye in the solution both before and after adsorption. ...
The project aims to remove reactive blue dye from the effluent of textile industries by utilizing coal-associated soil as an adsorbent, as it possesses effective physical properties and distinguishing characteristics. In comparison to other separation techniques, the adsorption method is the most effective, cost-effective, and straightforward. A batch adsorption investigation was carried out to examine the various adsorption-influencing factors, including solution pH, adsorbent dosage, contact time, temperature, and dye concentration. Contact time of 30 min, an adsorbent dosage of 10g.100 mL-1, a solution pH of 7, a temperature of 30°C, and an initial dye concentration of 100 mg.L-1 were found to be optimal for dye adsorption. Using two distinct kinetic models, the evaluation of kinetic studies revealed that the pseudo-second-order provided the greatest fit, with a higher R2 value than the pseudo-first-order. The thermodynamic parameters Gibbs free energy (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) indicated that the current adsorption system was exothermic and spontaneous. Further study of the adsorption isotherm revealed that the Langmuir isotherm model provided the best fit, with an R2 value of 0.977%.
... A few major sources of dye and pathways of dye pollution. Adapted from[22]. CC BY 3.0. ...
Silver nanoparticles (AgNPs) have received a lot of interest for their several applications, including their remarkable potential as photocatalysts for organic dye degradation. This research thoroughly investigates the efficacy of ecologically friendly, green-synthesized AgNPs in the treatment of synthetic dye-contaminated wastewater. The synthesis of AgNPs from various biological substrates is investigated, emphasizing their economic viability, significant conductivity, and considerable biocompatibility. The improper disposal of synthetic dyes in wastewater poses severe environmental and health risks due to their non-biodegradable nature and persistent chemical features. In response to this challenge, this review paper investigates the capability of AgNPs to serve as effective photocatalysts for degrading a range of organic dyes commonly found in industrial effluents. Specific dyes, including methyl orange, congo red, nitrophenol, methylene blue, and malachite green, are studied in the context of wastewater treatment, providing insights into the efficacy of AgNPs synthesized from diverse biological sources. The review sheds light on the photocatalytic degradation methods used by green-synthesized AgNPs, shedding light on the transition of these synthetic dyes into less hazardous compounds. It also delves into the toxicity aspect of the AgNPs and its possible remediation from the environment. The ecologically friendly synthesis procedures investigated in this work provide an alternative to traditional methods, highlighting the importance of sustainable technologies in solving modern environmental concerns. Furthermore, a comparative examination of various biological substrates for AgNPs synthesis is presented, evaluating their respective dye degradation efficiencies. This not only helps researchers understand the environmental impact of synthetic dyes, but it also directs them in choosing the best substrates for the production of AgNPs with enhanced photocatalytic activities.
... The most concerning pollution in these effluents is from colourants, which are soluble organic compounds, particularly direct, reactive, acidic, and basic dyes (Shindhal et al., 2020). Among these, basic and direct dyes have the highest poisoning rates (Rafiq et al., 2021), highlighting the harmful nature of these substances (Dutta et al., 2021). ...
Among the advanced oxidation processes (AOP) used to treat textile effluents, the Fenton process is particularly appreciated for its ability to effectively treat pollutants that are difficult to degrade by other conventional methods, such as synthetic dyes, especially basic or cationic dyes, which present the highest poisoning rates, underscoring the harmful nature of these substances. We conducted an examination in this context, concentrating on the impact of ions on dye degradation at a temperature of 294 K. This is because ions in solution left over from chemicals used during manufacturing processes can have a significant impact on the efficiency of the Fenton reaction, as they can act as catalysts or inhibitors of the reaction. The degradation of cationic, Basic Blue 26 (BB26) and Basic Violet 3 (BV3) dyes at an initial concentration of 10 mg/L by the Fenton process (Fe2+/ H2O2) was studied in this paper. The results showed a discolouration and degradation of 75.5% for BB26 and 45.4% for BV3 after 30 minutes. The effects of monovalent anions (Cl- and NO3-), divalent anions (SO42- and CO32-), and cations (Na+, K+, and Ca2+) on degradation rates were evaluated. The decrease in degradation yield by the presence of Na+, K+ and Ca2+ cations and Cl-, NO3- and SO42-anions for BB26 dye and by the presence of Na+ and Ca2+ cations and Cl- and SO42- anions for BV3 dye was discussed. On the other hand, K+ and NO3- ions have somewhat favoured the yield of BV3 dye degradation, while the presence of carbonate anion (CO32-) increased the degradation rate of our two dyes.
... Moreover, the high accumulation of pollutants in the air, water, and soil-in solid, liquid, and gaseous phases from various sources -lays the groundwork for the emergence of environmental problems, including water pollution. Dyes used in the production process in various industrial sectors such as cosmetics, leather, textiles, pharmaceuticals, food, paper, printing, and plastics are among the main pollutants that significantly increase water pollution (Dutta et al., 2021;Nachiyar et al., 2023). ...
In this study, adsorption parameters were examined to remove RN- RGB 150 ions from aqueous solutions by using activated carbon obtained from Posidonia Oceanica, which is known as seagrass. The structure of activated carbon derived from Posidonia Oceanica seagrass was characterized by FTIR, SEM, and BET analysis methods. The significance of parameters such as temperature, solution concentration, adsorbent dosage, and the influence of time on the adsorption performance of RN-RGB 150 ions has been comprehensively investigated. The adsorption of RN-RGB 150 ions onto PO-AC demonstrated exceptional agreement with the Langmuir isotherm model, achieving a remarkable maximum adsorption capacity of 60.97 mg.g⁻¹ and an adsorbate density of 0.1519 L m.g⁻¹. This significant finding highlights the potential of PO-AC as a highly effective adsorbent for RN-RGB 150 ions, suggesting its suitability for applications such as wastewater treatment.
