Cladophora Algae Modified with CuO Nanoparticles for Tetracycline Removal from Aqueous Solutions

Aug 1, 2022

Journal Water, Air, & Soil Pollution

publisher Springer International Publishing

DOI https://doi.org/10.1007/s11270-022-05813-4

Issue 8

Volume 233

Modified algae with nano copper oxide (CuO) were used as adsorption media to remove tetracycline (TEC) from aqueous solutions. Functional groups, morphology, structure, and percentages of surfactants before and after adsorption were characterised through Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Several variables, including pH, connection time, dosage, initial concentrations, and temperature, were controlled to obtain the optimum condition. Thermodynamic studies, adsorption isotherm, and kinetics models were examined to describe and recognise the type of interactions involved. Resultantly, the best operation conditions were at pH 7, contact time of 240 min, 5 g/L of dosage, initial concentration of 25 mg/L, and a temperature of 45 °C. The removal percentage of TEC under the optimum condition was 96%. Thermodynamic analysis indicated that the removal efficiency was slightly increased with temperature depending on the positive value of Δ𝐻°, thus indicating that the adsorption phenomenon was endothermic. The Langmuir model fitted the study (R2 = 0.998), demonstrating that the adsorption sites were homogenous. The experimental results were best matched with the second-order kinetic model, implying that chemisorption was the primary process during the adsorption process. Compared to previous research and based on the value of qmax (15.60 mg/g), the biomass was suitable for TEC removal.

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Phytoremediation of tetracycline via the coontail Ceratophyllum demersum in antibiotics-contaminated water

Apr 10, 2023

Journal Biocatalysis and Agricultural Biotechnology

publisher Elsevier

DOI https://doi.org/10.1016/j.bcab.2023.102887

Volume 53

This study investigated the phytoremediation of tetracycline (TC) for 21 days using the coontail Ceratophyllum demersum. Experiments were conducted at varying TC concentrations: 5, 10, 50, 75, 100, and 150 mg/L. Besides, the water quality of the hydroponic medium was monitored based on pH values, total dissolved solids (TDS), dissolved oxygen (DO), and water temperatures. The TC concentration that killed half of the plants (half-life) in 14 days was 50 mg/L. Removals of TC were 85.0%, 82.0%, 79.7%, 78.0%, 67.0%, and 60.0% for TC concentrations of 50, 40, 30, 20, 10, and 5 mg/L, respectively. On day 21, their respective residual TC concentrations were 7.5, 7.2, 6.1, 4.4, 3.3, and 2 mg/L. The coontail was characterized by analysis Fourier transform infrared (FTIR) spectroscopy. This work revealed that the presence of O–H, –CH2-, Cdouble bondC, Cdouble bondO, C–H, and O–Si–O groups in the plant tissues had enabled coontail to absorb TC from aqueous solution. Meanwhile, pH and TDS values increased alongside the TC concentrations. By contrast, the DO values decreased due to the bacterial decomposition of dead plants and depleted the oxygen in the water during phytoremediation. Our findings suggested that the coontail might be an appropriate phytoremediation agent for treating antibiotics-contaminated wastewater.

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Rice husk coated with copper oxide nanoparticles for 17α-ethinylestradiol removal from an aqueous solution: adsorption mechanisms and kinetics Research Published: 24 August 2023

Aug 24, 2023

Journal Environmental monitoring and assessment

publisher Springer International Publishing

DOI https://doi.org/10.1007/s10661-023-11689-6

Issue 9

Volume 195

The 17 α-ethinylestradiol (EE2) adsorption from aqueous solution was examined using a novel adsorbent made from rice husk powder coated with CuO nanoparticles (CRH). Advanced analyses of FTIR, XRD, SEM, and EDSwere used to identify the classification parameters of a CRH-like surface morphology, configuration, and functional groups. The rice husk was coated with CuO nanoparticles, allowing it to create large surface area materials with significantly improved textural qualities with regard to functional use and adsorption performance, according to a detailed characterization of the synthesized materials. The adsorption process was applied successfully with elimination effectiveness of 100% which can be kept up to 61.3%. The parameters of adsorption were affecting the adsorption process significantly. Thermodynamic data stated that the process of adsorption was endothermic, spontaneous, chemisorption and the molecules of EE2 show affinity with the CRH. It was discovered that the adsorption process controlled by a pseudo-second–order kinetic model demonstrates that the chemisorption process was controlling EE2 removal. The Sips model is regarded as optimal for representing this practice, exhibiting a significantly high determination coefficient of 0.948. This coefficient implies that the adsorption mechanism indicates the occurrence of both heterogeneous and homogeneous adsorption. According to the findings, biomass can serve as a cheap, operative sorbent to remove estrogen from liquified solutions.

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Date Palm Fibre Waste Exploitation for the Adsorption of Congo Red Dye via Batch and Continuous Modes

Aug 24, 2023

Journal Journal of Ecological Engineering

publisher Polskie Towarzystwo Inżynierii Ekologicznej

DOI https://doi.org/10.12911/22998993/169176

Issue 10

Volume 24

The present study utilised date palm fibre (DPF) waste residues to adsorb Congo red (CR) dye from aqueous solutions. The features of the adsorbent, such as its surface shape, pore size, and chemical properties, were assessed with X-ray diffraction (XRD), BET, Fourier-transform infrared (FTIR), X-ray fluorescence (XRF), and field emission scanning electron microscope (FESEM). The current study employed the batch system to investigate the ideal pH to adsorb the CR dye and found that acidic pH decolourised the dye best. Extending the dye-DPF waste mixing period at 25 °C reportedly removed more dye. Consequently, the influence of the starting dye and DPF waste quantity on dye removal was explored in this study. At 5 g/L dye concentration, 48% dye removal was achieved, whereas at low dye concentrations, only 40% of the dye was removed. The current study also evaluated the DPF particle size created for dye adsorption, yielding a 66% optimal powder size removal. The heat impact assessment performed in this study indicated that increased temperature affected the amount of dye eliminated from aqueous solutions, where a 72% removal was recorded at 45 °C. The pseudo-first- and pseudo-second-order models were utilised to predict the maximum CR dye adsorption with DPF waste. Resultantly, the Langmuir-Freundlich experimental DPF waste CR adsorption documented pseudo-second-order kinetics. In a fixed bed reactor, the DPF waste has been reported to remove CR dye constantly. Consequently, several factors affecting the removal process, including the effects of primary dye, the flow rate of the liquid inside the column, the depth of the filling inside the column, and flow rate were assessed. The results were simulated in the COMSOL® program and compared to practical experiments, which yielded a 99% match. Conclusively, DPF waste could remove several colours from wastewater via active removal.

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Reliable treatment approach for levofloxacin and ciprofloxacin removal from aqueous medium: process modelling, kinetic and isotherm studies

Sep 1, 2023

Journal Desalination and Water Treatment

publisher Elsevier

DOI https://doi.org/10.5004/dwt.2023.29776

Volume 307

Current work aimed to optimize the electrocoagulation (EC) process for the efficient and economic removal of ciprofloxacin (CIP) and levofloxacin (LVX) from aqueous solution via response surface methodology. Four main parameters were selected for the optimisation process, including the initial pH of the solution, initial concentration of antibiotics, operation time, and current density. Subsequently, kinetic and isotherm modelling was performed to characterise the performance behaviour of the EC process at optimum conditions. Based on the results, the EC process achieved a removal efficiency of 92% and 84% for CIP and LVX, respectively, under optimum experimental conditions. The experimental results were consistent with the Langmuir isotherm model for the adsorption of both antibiotics on the iron hydroxide (Fe(OH)3) flocs based on the predicted maximum adsorption capacity of 142 and 185 mg/g, respectively. In addition, the experimental results best fitted the second-order kinetic model with a coefficient of determination (R2) value of 0.986 and 0.992 for CIP and LVX, respectively, implying the chemisorption mechanism controlling the adsorption process. The regression analysis also showed that the experimental results best fitted with the second-order polynomial model with a predicted correlation coefficient (Pred. R2), adjusted correlation coefficient (Adj. R2), and R2 of 0.834, 0.941, and 0.967 for CIP; 0.723, 0.908, and 0.952 for LVX, respectively. In short, a comprehensive economic evaluation was performed and the total operational cost over a single run under optimized EC conditions was estimated at $0.490 US/m3. Under optimized EC conditions, the electrical energy consumption and electrode consumption were 3 kWh/m3 and 0.167 kg/m3, respectively, during a single run.

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DRINKING WATER QUALITY AND ITS IMPACT ON PUBLIC HEALTH: REVIEW

Sep 11, 2023

Journal Academia Repository

DOI https://doi.org/10.1007/s10661-024-13603-0

Issue 9

Volume 4

Despite the fact that water is necessary for life, contaminated water worsens people's health. The acquisition of potable water mostly stems from three main sources: surface water, groundwater, and precipitation. A significant portion of the population residing in developing nations continues to endure the proliferation of waterborne illnesses, a trend exacerbated by inadequate sanitation practices and limited availability of potable water. To facilitate the formulation of an effective approach towards mitigating the possible deterioration of water quality in susceptible regions, an extensive examination of scholarly literature pertaining to the management of water quality and the prevention of waterborne illnesses was conducted. In order to promote a sustainable and healthy environment, it is imperative to undertake comprehensive reforms within public health institutions. This includes revitalizing the monitoring and evaluation systems within relevant departments, implementing sustainable development techniques to enhance water quality, and disseminating awareness and health education initiatives among the populace.

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Enhancing microbial desalination cell performance for water desalination and wastewater treatment: experimental study and modelling of electrical energy production in open and closed-circuit modes

Oct 19, 2023

Journal Journal of Chemical Technology & Biotechnology

publisher John Wiley & Sons, Ltd

DOI https://doi.org/10.1002/jctb.7538

Issue 1

Volume 99

BACKGROUND Microbial desalination cell (MDC) is a new technology in the use of electrical energy for water desalination and wastewater treatment. RESULTS Open circuit (OC) and closed circuit (CC) modes were successfully simulated with initial TDS concentrations of 10 g/L and 10–15 g/L, respectively (an external resistance of only 150 Ω was applied for CC). After 160 h of operation, the maximum OC voltage, desalination efficiency and COD removal efficiency were 809 mV, 32.2% and 79.2%, respectively. The maximum voltage was also obtained when the external resistances were 150 Ω (423.4 and 438 mV) for the initial NaCl concentrations (10 and 15 g/L) in the central chamber, respectively. Moreover, the maximal desalting and COD removal efficiencies after 24 h run-time were (30% and 28%) and (24% and 25%) for initial NaCl concentrations (10 or 15 g/L) in the central chamber, respectively. Maintaining pH (8.61, 7.01) to (7.85, 7.8) in anode and cathode chambers was studied. This research accurately depicted microbial desalination's efficiency in generating OC voltages and CC electrical energy via Box–Behnken Design Distribution (BBD). Investigated factors’ interactions (initial salt/COD concentrations, time) on CC system's energy efficiency. Resulted in peak productivity at (1.85 mW), OC reaching (1100 mV). CONCLUSION Finally, the research paper gave exciting results in improving the efficiency of the microbial desalination cell to increase the ability to produce electrical energy and desalinate water. © 2023 Society of Chemical Industry (SCI).

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Correction to: Utilising date palm fibres as a permeable reactive barrier to remove methylene blue dye from groundwater: a batch and continuous adsorption study

Jan 13, 2025

Journal ENVIRONMENTAL MONITORING AND ASSESSMENT

publisher Springer International Publishing

DOI https://doi.org/10.1007/s10661-024-13603-0

Issue 2

Volume 197

This study aimed to utilise cheap and abundantly available date palm fibre (DPF) wastes for the remediation of methylene blue (MLB) dye–contaminated groundwater. The DPF adsorbents were first prepared, followed by various characterisation analyses, including surface morphology, functional groups, and material structure. Subsequently, the DPF adsorbents were applied in the batch and continuous adsorption studies to assess the MLB dye removal from aqueous environments. The batch adsorption study achieved 98% maximum removal efficiency with a contact time, adsorbents dosage, initial pH, temperature, particle size, initial dye concentration, and agitation speed of 105 min, 3 g/L, 7.0, 45 °C, 0.075 mm, 50 mg/L, and 150 rpm, respectively. Langmuir was the best-fitted isotherm model depending on a higher correlation coefficient (R2 = 0.985), with a maximum monolayer dye adsorption capacity (qmax) of 54.204 mg/g. Additionally, the second order was the best-fitted kinetic model (R2 = 0.990), indicating that MLB dye was removed through chemisorption. Besides, the positive enthalpy change (ΔH°) and negative Gibb’s free energy (ΔG°) values verified the endothermic process and spontaneous adsorption. According to the impact analysis of initial dye concentrations and flow rates on the permeable reactive barrier (PRB) performance in the continuous adsorption study using the Thomas, Belter, and Yan models, the experimental results and predicted breakthrough curves reflected an excellent agreement (R2 ≥ 0.8767) and a sum of squared errors (SSE) ≤ 0.4834. In short, the results demonstrated DPF as an effective adsorbent material in PRB technology.

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