Uranium extraction from aqueous solution using dried and pyrolyzed tea and coffee wastes

Aly, Zaynab; Luca, Vittorio

doi:10.1007/s10967-012-1851-6

Cited by 62 publications

(20 citation statements)

References 56 publications

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“…Moreover, the values of n and K F of the Freundlich model indicate good adsorption intensity and capacity, respectively: n was close to unity for all the examined food waste adsorbents and for both Trichloroethylene and p-Xylene, indicating that VOCs adsorption is favorable [52]. Furthermore, the low values of APE and χ 2 in association with higher R 2 generate a satisfactory fit of Freundlich model to the experimental data, even if they are little higher for lemon peel.…”

Section: Adsorption Isothermsmentioning

confidence: 70%

“…In Freundlich isotherm, K F (mg/L) and n (dimensionless) are both constants indicative of sorption capacity and sorption intensity, respectively [52,53]. In particular, n indicates the favorability of the adsorption process [52]; a close to unit n value represents good adsorption capacity, meaning VOCs' adsorption is favorable [52]. The evaluation of the correlation coefficients (R 2 ) is useful to predict which model best matches with the experimental data.…”

Section: Isotherm Models Linearmentioning

confidence: 99%

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Food Waste Materials as Low-Cost Adsorbents for the Removal of Volatile Organic Compounds from Wastewater

et al. 2019

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The aim of this work was to study the potential of food waste materials (banana peel, potato peel, apple peel, lemon peel, coffee waste, decaf coffee waste, grape waste, and carob peel) as low-cost adsorbents for the removal of aliphatic and aromatic volatile organic compounds (VOCs) from wastewater. The ability of examined food waste materials to adsorb VOCs from synthetic multi-component standard solutions was evaluated and the examined food waste materials showed high removal efficiency. Performances of coffee waste, grape waste, and lemon peel were detailed by using Trichloroethylene and p-Xylene in mono-component standard solutions. The adsorption capacity of the three selected food wastes was determined by using linear Langmuir and Freundlich isotherm models. Two errors functions, average percentage error (APE) and the chi-square test (χ2), were used for isotherm optimization prediction. Freundlich isotherm well described the adsorption of VOCs on the considered materials. According to the obtained results, a multilayer, physical, and cooperative adsorption process was hypothesized, particularly evident when the VOCs’ concentrations are high. This was confirmed by the high adsorption efficiency percentages (E% > 80%) of VOCs from a real polluted matrix (urban solid waste leachate), containing high concentrations of total organic content.

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Section: Adsorption Isothermsmentioning

confidence: 70%

Section: Isotherm Models Linearmentioning

confidence: 99%

Food Waste Materials as Low-Cost Adsorbents for the Removal of Volatile Organic Compounds from Wastewater

et al. 2019

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“…Based on the linear equation, the Langmuir model parameters were calculated as q m = 526.3 mg/g; k l = 0.0156 L/mg; 0.0008 ≤ R L ≤ 0.074. The R L was much less than 1, meaning that the adsorption progress is favorable (Aly & Luca, ). The calculated q m corresponds well to the plateau in the isotherm graph (Figure ), which slightly fluctuated around 520 mg/g.…”

Section: Resultsmentioning

confidence: 99%

Mechanism Study of the Formation of Indigo Carmine–Aluminum Hydroxide Lake for Food Use

Yuan

Wang

Liu

et al. 2019

Journal of Food Science

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Although aluminum lakes are widely used in food industry for dyeing demands, there is still a dearth in the understanding of the colorant lake formation mechanism. In this study, indigo carmine (IC) lake (IC–aluminum hydroxide complex), a frequently used blue lake in the food industry, was investigated in terms of kinetics, isotherms, properties of colloidal particles, infrared (IR) spectra, and titration curves. Pseudo‐second‐order model presented the strongest correlation with the kinetic data at all pH levels (R2 ≥ 0.994). In pH range from 4 to 7, the colloidal particles of aluminum hydroxide were positively charged with zeta potential around 44 mV; a further pH increase induced to a decreased zeta potential, which reached negative levels at pH 10 and beyond. Diameter maximized at pH 10 (22.47 µm) and declined when the pH was reduced. Isotherm analysis showed that the adsorption followed monolayer adsorption patterns, as described by the Langmuir isotherm model. IR spectra indicated sulfonic acid groups participated in a chemical reaction during adsorption, and the titration assay further confirmed the formation of coordination bonds between sulfonic acid groups and aluminum atoms. This study profiled the reaction responsible for the formation of the blue lake and elucidated its reaction mechanism. Furthermore, the outcome could assist in improving the production efficiency of the lake through achieving higher reaction rate and adsorption capacity. Practical Application The study elucidated the mechanism of indigo carmine (IC)–aluminum hydroxide lake formation, including profile of the adsorption process and molecular interaction between the blue dye and the hydroxide. The outcome of this study would help to improve the production efficiency of IC–aluminum hydroxide lakes, and to decrease the content of aluminum required in the lake by optimizing the production parameters to enhance the adsorption capacity of aluminum hydroxide, which would facilitate the alleviation of the potential health hazards caused by excessive intake of aluminum through foods.

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“…However, a few studies have addressed the potential use of tea and coffee wastes for the extraction of uranium from aqueous solutions. Uranium extraction from aqueous solution using dried and pyrolyzed tea and coffee wastes was the aim of [128].…”

Section: Different Adsorbents Derived From Agricultural By-products/wmentioning

confidence: 99%

Low-cost Adsorbents Derived from Agricultural By-products/Wastes for Enhancing Contaminant Uptakes from Wastewater: A Review

Sulyman

Namieśnik

Gierak

2017

Pol. J. Environ. Stud.

201

112

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A major threat to the comfort of human life has been imposed by increased industrialization and urbanization. The generation and disposal of huge amounts of toxic materials and pollutants have heavily contaminated our environment. Some Organics such as synthetic dyes (SD) and heavy metals (HM) are becoming increasingly prevalent as the most dangerous pollutants in soil and surface water environments. They are causing great concern worldwide due to their toxicity to many life forms.Environmentally friendly utilization of agricultural by-products/waste materials either as raw materials or in production of so-called activated carbons (AC) is an important issue. Because it is apparent from our literature review that the main factors characterizing these materials are their affordability, local availability, and efficiencies in removing many unwanted toxics and pollutants, they therefore could be utilized instead of more conventional but expensive adsorbent materials, particularly in developing countries where many industries lack appropriate individual sewage treatment systems; even where they exist, they lack satisfactory functioning and maintenance because of the lack of good budgets.A number of case studies are supplied in this review. These case studies have pointed to the efficient removal of SD/HM ions from aqueous solutions by the agricultural by-products/wastes in the form of a raw material, signifying spent tea leaves (STL) as a good example. Besides, the efficient removal of such ions by AC produced from these agricultural by-products/wastes has also been given in detail, suggesting a variety of AC agricultural by-products/wastes sources. Both kinds are widely used adsorbents in the treatment of wastewaters. Our review has shown that these adsorbents are characterized by many exceptional physical and chemical features that make them widely used adsorbents in the treatment of wastewaters. The adsorption efficiencies by these substances were also affected by the characteristics of AC, which depend on the physical and chemical properties of the precursor (i.e., agricultural by-products/wastes) as well as on the activation method applied, which is either chemical or physical. The structural properties of the resulting

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Uranium extraction from aqueous solution using dried and pyrolyzed tea and coffee wastes

Cited by 62 publications

References 56 publications

Food Waste Materials as Low-Cost Adsorbents for the Removal of Volatile Organic Compounds from Wastewater

Food Waste Materials as Low-Cost Adsorbents for the Removal of Volatile Organic Compounds from Wastewater

Mechanism Study of the Formation of Indigo Carmine–Aluminum Hydroxide Lake for Food Use

Low-cost Adsorbents Derived from Agricultural By-products/Wastes for Enhancing Contaminant Uptakes from Wastewater: A Review

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