Removal of Cu(II) from aqueous solution using a composite made from cocoa cortex and sodium alginate

Fotsing, Patrick Nkuigue; Woumfo, Emmanuel Djoufac; Măicăneanu, Andrada; Vieillard, Julien; Tcheka, Constant; Ngueagni, P. Tsopbou; Siéwé, Jean Mermoz

doi:10.1007/s11356-019-07206-3

Cited by 22 publications

(9 citation statements)

References 66 publications

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“…For pH values greater than 4.27, the decrease in adsorption yield observed could be explained by the decrease in Pb 2+ concentration and [Pb(OH)] + ions as well as the appearance of Pb(OH) 2 species in solution. These results are in agreement with the literature 37 . However, for a Pb(II) solution at an initial concentration of 113.4 mg L −1 and considering the solubility product of the reaction of Eqn (13), which has a value of K sp = 1.42 × 10 −20 , the pH at which precipitation occurs is 5.71 indicating that the formation of Pb(OH) 2 is unlikely to occur at pH 5 or lower.

{Pb}^{2 +} + {2OH}^{-} ➔ Pb {(OH)}_{2}

…”

Section: Resultssupporting

confidence: 94%

“…Ge et al 33 . and Fotsing et al 37 . have shown that the adsorption of Pb(II) ions on geopolymer composite spheres obtained from alkaline solution and on composites of cocoa cortex with Alg‐Na more closely obeys the Langmuir model ( R 2 = 0.997 and 0.996, respectively) with the same type of binding as the adsorption on Alg/GES; in line with this, it could be concluded that the acid solution serving as a hardener in the synthesis of GES would modify the surface of the material and would influence the mode of fixation.…”

Section: Resultsmentioning

confidence: 97%

“…The initial rate of adsorption could be explained by the availability and the strong activity of the binding sites present on the Alg/GES (as shown by BET and BJH), which would facilitate access of lead ions into the mesopores of the GES composite 33,34 . The formation of the bearing reflected the saturation of adsorption sites and the mass transfer from the liquid phase to the surface no longer occurring, 6,37 thus marking the attainment of the balance of the adsorbate–adsorbent system. The experimental adsorption capacity of Pb(II) ions determined at equilibrium was 38 mg g −1 while the liquid Pb(II) concentration was 18.40 mg L −1 .…”

Section: Resultsmentioning

confidence: 99%

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Removal of lead ions from aqueous solution using phosphate‐based geopolymer cement composite

Njimou

Pengou

Tchakouté

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Water contaminated by heavy metals has many negative impacts on human health and the environment. According to the UN's sustainable development goals, preserving natural resources will have positive impacts on living conditions by reducing diseases. In this study, a novel adsorbent synthesized from phosphate‐based geopolymer cement composite material was developed and evaluated for lead removal from aqueous solutions. The developed adsorbent is made from natural resources using a facile protocol, and thus it is suitable for both developed and developing countries. RESULTS Analyses of mineralogical composition, pore‐size distribution and surface of the synthesized phosphate‐based geopolymer cement composite were performed. A microporous structure was observed from the microstructural characterization. Geopolymer cement was immobilized with sodium alginate to fabricate alginate–geopolymer cement beads (Alg/GES). The parameters influencing the adsorption process were investigated in batch mode. The obtained results showed that the adsorption capacity of Pb(II) ions increased with time and equilibrium was reached in 90 min. The optimum adsorption pH was 4.17. The experimental results showed that the adsorption equilibrium of Pb(II) on Alg/GES was well described by the Freundlich and Langmuir models whereas the adsorption rate was well fitted by the pseudo‐second‐order kinetics model. The maximum adsorption capacity obtained from the Langmuir isotherm was qmax = 0.38 mmol g−1. From the Dubinin–Radushkevitch isotherm model, the value of the free adsorption energy was 41 kJ mol−1. CONCLUSIONS Compared with other adsorbents, Alg/GES exhibited a greater adsorption capacity confirming that the phosphate‐based geopolymer cement can be suitable for removal of heavy metals from wastewaters. © 2021 Society of Chemical Industry

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{Pb}^{2 +} + {2OH}^{-} ➔ Pb {(OH)}_{2}

…”

Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Removal of lead ions from aqueous solution using phosphate‐based geopolymer cement composite

Njimou

Pengou

Tchakouté

et al. 2021

J of Chemical Tech & Biotech

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“…This trend of increasing biosorbent dosage leading to enhancing % of Cu(II) ions confiscated was ascribed to increased active accessible sites available coupled with elevated surface area as the biosorbent dosage was improved, leading to enhanced biosorption of Cu(II) ions [22]. A similar inclination of improved % of Cu(II) ions removed using different biosorbents was also reported in the study by [68][69][70].…”

Section: Effect Of Biochar Dosage On the Adsorption Of Cu(ii) Ionssupporting

confidence: 73%

Copper(II) ion removal by chemically and physically modified sawdust biochar

Eleryan

Aigbe

Ukhurebor

et al. 2022

Biomass Conv. Bioref.

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The difference between physical activations (by sonications) and chemical activations (by ammonia) on sawdust biochar has been investigated in this study by comparing the removal of Cu(II) ions from an aqueous medium by adsorption on sawdust biochar (SD), sonicated sawdust biochar (SSD), and ammonia-modified sawdust biochar (SDA) with stirring at room temperature, pH value of 5.5–6.0, and 200 rpm. The biochar was prepared by the dehydrations of wood sawdust by reflux with sulfuric acid, and the biochar formed has been activated physically by sonications and chemically by ammonia solutions and then characterized by the Fourier transform infrared (FTIR); Brunauer, Emmett, and Teller (BET); scanning electron microscope (SEM); thermal gravimetric analysis (TGA); and energy-dispersive spectroscopy (EDX) analyses. The removal of Cu(II) ions involves 100 mL of sample volume and initial Cu(II) ion concentrations (conc) 50, 75, 100, 125, 150, 175, and 200 mg L−1 and the biochar doses of 100, 150, 200, 250, and 300 mg. The maximum removal percentage of Cu(II) ions was 95.56, 96.67, and 98.33% for SD, SSD, and SDA biochars, respectively, for 50 mg L−1 Cu(II) ion initial conc and 1.0 g L−1 adsorbent dose. The correlation coefficient (R2) was used to confirm the data obtained from the isotherm models. The Langmuir isotherm model was best fitted to the experimental data of SD, SSD, and SDA. The maximum adsorption capacities (Qm) of SD, SSD, and SDA are 91.74, 112.36, and 133.33 mg g−1, respectively. The degree of fitting using the non-linear isotherm models was in the sequence of Langmuir (LNR) (ideal fit) > Freundlich (FRH) > Temkin (SD and SSD) and FRH (ideal fit) > LNR > Temkin (SDA). LNR and FRH ideally described the biosorption of Cu(II) ions to SD and SSD and SDA owing to the low values of χ2 and R2 obtained using the non-linear isotherm models. The adsorption rate was well-ordered by the pseudo-second-order (PSO) rate models. Finally, chemically modified biochar with ammonia solutions (SDA) enhances the Cu(II) ions’ adsorption efficiency more than physical activations by sonications (SSD). Response surface methodology (RSM) optimization analysis was studied for the removal of Cu(II) ions using SD, SSD, and SDA biochars.

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“…Hence, adsorption depends on the initial concentration of Cu(II). As this concentration increases, more active sites are covered, and Cu(II) ions have greater competition for the surface of the adsorbent [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

Aloe Vera Functionalized Magnetic Nanoparticles Entrapped Ca Alginate Beads as Novel Adsorbents for Cu(II) Removal from Aqueous Solutions

Lilhare¹,

Mathew²,

Singh

et al. 2022

Nanomaterials

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CABs (Ca alginate beads), AVCABs (Aloe vera Ca alginate beads), and AVMNCABs (Aloe-vera functionalized magnetic nanoparticles entrapped Ca alginate beads) were developed as adsorbents for the removal of Cu(II) from aqueous solutions. The materials were characterized using Fourier-transform infrared (FTIR) spectroscopy, high-resolution scanning electron microscopic (HR-SEM) analysis, X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, and a vibrating-sample magnetometer (VSM). The effect of several parameters, such as pH, time, temperature, adsorbent dose, etc., were investigated. The adsorption isotherm of Cu(II) was adjusted best to the Langmuir model. The maximum adsorption capacities were 111.11 mg/g, 41.66 mg/g, and 15.38 mg/g for AVMNCABs, AVCABs, and CABs, respectively. The study of the adsorption kinetics for Cu(II) ions on beads followed a pseudo-second-order kinetic model, with a very good correlation in all cases. The adsorption studies used a spectrophotometric method, dealing with the reaction of Cu(II) with KSCN and variamine blue.

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Removal of Cu(II) from aqueous solution using a composite made from cocoa cortex and sodium alginate

Cited by 22 publications

References 66 publications

Removal of lead ions from aqueous solution using phosphate‐based geopolymer cement composite

Removal of lead ions from aqueous solution using phosphate‐based geopolymer cement composite

Copper(II) ion removal by chemically and physically modified sawdust biochar

Aloe Vera Functionalized Magnetic Nanoparticles Entrapped Ca Alginate Beads as Novel Adsorbents for Cu(II) Removal from Aqueous Solutions

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