Pb2+ ions adsorption onto raw and chemically activated Dibetou sawdust: Application of experimental designs

Hajam, Maryam El; Kandri, N. Idrissi; Plavan, Gabriel-Ionuţ; Harrath, Abdel Halim; Mansour, Lamjed; Boufahja, Fehmi; Zerouale, Abdelaziz

doi:10.1016/j.jksus.2020.02.027

Cited by 33 publications

(21 citation statements)

References 66 publications

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“…High membrane cost, requirement of resin fouling, resin regeneration [22,23] Coagulation and flocculation Settling and dewatering of sludge High cost, large consumption of chemicals [24,25] Membrane filtration [7,30] The majority of these methods [7,[18][19][20][21][22][23][24][25][26][27][28][29][30] are expensive, ineffective in certain concentrations, or time-consuming, and adsorption is limited by the cost of the adsorption material [1,[6][7][8][9]31,32]. For these reasons, the choice of sorbent is crucial for the development of a simple, efficient, inexpensive, and environmentally friendly water purification method [33,34].…”

Section: Advantages Disadvantages Referencementioning

confidence: 99%

“…Low-cost sorbents can be used for metal adsorption in either their natural form or after suitable modifications to improve their adsorption capacity [33,34,37]. Adsorbents suitable for this purpose are biodegradable and cheap compared to activated carbon or ion exchange resins [1]. These materials include corn stalk [38], tree bark [39], grain residues [40], almond shells [41], sunflower stalks [42], peat [43], peanut husk [44], tea leaves [45], sawdust [46], and others with the capacity for water treatment.…”

Section: Advantages Disadvantages Referencementioning

confidence: 99%

“…Industrial progress contributes to the economic development of individual countries. However, such progress is always accompanied by endangering and contamination of the environment by diverse pollutants [1].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to organic contaminants, heavy metals are non-degradable and cannot be easily biologically detoxified. They can accumulate in living organisms through the consumption of contaminated food and water [1,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the negative effects of heavy metals, eliminating them from waste waters is a priority [1]. Many processes have been developed for the removal of heavy metals from contaminated waters, for instance chemical precipitation, flotation, ion exchange, coagulation and flocculation, membrane filtration, electrodialysis, and adsorption for the purpose of water treatment [17].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water

et al. 2020

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Organic waste materials and semi-products containing cellulose are used as low-cost adsorbents that are able to compete with conventional sorbents. In addition, their capacity to bind heavy metal ions can be intensified by chemical treatments using mineral and organic acids, bases, oxidizing agents, and organic compounds. In this paper, we studied the biosorption capacity of natural and modified wooden sawdust of poplar, cherry, spruce, and hornbeam in order to remove heavy metals from acidic model solutions. The Fourier transform infrared spectroscopy (FTIR) spectra showed changes of the functional groups due to the alkaline modification of sawdust, which manifested in the considerably increased intensity of the hydroxyl peaks. The adsorption isotherm models clearly indicated that the adsorptive behavior of metal ions in treated sawdust satisfied not only the Langmuir model, but also the Freundlich model. The adsorption data obtained for studied sorbents were better fitted by the Langmuir isotherm model for both metals, except for spruce sawdust. Surface complexation and ion exchange are the major mechanisms involved in metal ion removal. We investigated the efficiency of the alkaline modified sawdust for metal removal under various initial concentrations of Cu(II) and Zn(II) from model solutions. The highest adsorption efficiency values (copper 94.3% at pH 6.8 and zinc 98.2% at pH 7.3) were obtained for poplar modified by KOH. For all types of sawdust, we found that the sorption efficiency of modified sorbents was higher in comparison to untreated sawdust. The value of the pH initially increased more in the case of modified sawdust (8.2 for zinc removal with spruce NaOH) and then slowly decreased (7.0 for Zn(II) with spruce NaOH).

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Section: Advantages Disadvantages Referencementioning

confidence: 99%

Section: Advantages Disadvantages Referencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water

et al. 2020

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Removal of phosphate from synthetic wastewater: A comparative study between both activated clays using an experimental design methodology

Yahya

Msadok

et al. 2022

Water Environment Research

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Phosphate‐loaded industrial wastewaters have resulted in numerous environmental issues that have hard hit the Gulf of Gabes‐Tunisia, making the environmental protection one of the most compelling priorities. Consequently, this study aimed first to compare the amounts of phosphate adsorbed by two types of Tunisian activated clays. The second goal was to assess and optimize the phosphate removal efficiency of these clays, using Box–Behnken design (BBD) under response surface methodology. Results showed that the highest adsorption amounts of 130.16 mg g−1, 125.42 mg g−1 were yielded for Jebel Haidoudi clay and Douiret clay, respectively. These values demanded an initial phosphate concentration of 300 mg L−1, a contact time of 5 h, and a pH of 2). Thus, kinetic and isotherm studies of phosphate elimination from synthetic solutions demonstrated that for both activated clays, the pseudo‐second‐order and Langmuir equation fitted very well the experimental data, respectively. These results indicate that phosphate adsorption might be mainly a chimisorption phenomenon and a monolayer process. All these findings confirmed that both activated clays could be considered as a competent, cost‐effective, efficient and ecological alternative for the elimination of phosphate from industrial wastewaters. Practitioner Points Activated clay could be adopted as an efficient and cost‐effective adsorbent. The optimum conditions were nominated as 300 mg L−1 of initial phosphate concentration, 5 h contact times and pH = 2. The probable uptake mechanism of phosphate followed predominantly the acid‐base interaction and hydrogen bond.

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