Carbons prepared from coffee grounds by H3PO4 activation: Characterization and adsorption of methylene blue and Nylosan Red N-2RBL

Reffas, Abdelbaki; Bernardet, Véronique; David, B.; Reinert, Laurence; Lehocine, M. Bencheikh; Dubois, Marc; Batisse, Nicolas; Duclaux, Laurent

doi:10.1016/j.jhazmat.2009.10.076

Cited by 263 publications

(115 citation statements)

References 37 publications

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“…The spectrum of the activated carbon (A) is similar to others shown in the literature for chemical activation of lignocellulosic materials by H 3 PD 4 (Alves et al, 2013;Reffas et al, 2010). The bands between 1300 and 1000 cm , are attributed to P=D stretching vibrations (A) and C-D stretching in acids, alcohols, phenols, ethers and esters (B).…”

Section: Adsorbent Characterizationsupporting

confidence: 70%

“…The isotherms obtained in the carbon activated with H 3 PD 4 (impregnation rate of 100%) were classified as Type OV because they showed hysteresis, indicating the start of the development of mesopores. Reffas et al (2010) prepared carbons activated with coffee sediment treated with H 3 PD 4 and observed Type-O isotherm in this material, typical of microporous materials for adsorbents prepared with a low impregnation rate (OR <30%). As impregnation was increased, there was an increase in hysteresis up to the point (OR > 120%) where the response changed and the isotherm assumed Type-OV characteristics, associated with the presence of slit-shaped mesopores, similar to that shown in Figure 3.…”

Section: Adsorbent Characterizationmentioning

confidence: 67%

“…The preparation of the adsorbent by activating defective coffee beans press cake (CADC) with 168% impregnation rate showed a much smaller surface area compared with DPNAC, confirming the significant effect that the precursor material has on the physical properties in the preparation of the adsorbent. Furthermore, the impregnation time used in this study, of 3 min, is significantly shorter than the 3 h adopted by Reffas et al (2010). However, the MG molecule is rather small (1.58 nm) and thus both mesopores (2 to 50 nm average diameter) and micropores (less than 2 nm average diameter) of the adsorbent must be accessible for the dye (Onternational Union of Pure and Applied Chemistry, 1972).…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

“…However, complex media, as is the case of hydrocolloid extracts, where components must be preserved, requires the use of adsorbents with specificity and selectivity. Many researchers have studied the production of AC using renewable and cheaper precursors which are mainly industrial and agricultural by-products (Alves et al, 2013;Clark et al, 2012;Reffas et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

et al. 2018

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Hydrocolloids of Pereskia aculeata Miller (DPNH) are potential ingredients in food industry as emulsifiers and stabilizers. The extraction process of DPNH requires the removal of pigments with activated carbon. Because this step is critical to the quality of the ingredient and has an impact on costs, a new activated carbon has been developed with residues from the same process. Residues activated with NaDH and H 3 PD 4 (300 °C, 1 h) were subjected to batch adsorption tests in model solutions of malachite green (MG), carbohydrate and protein. Residue treated with 85% H 3 PD 4 (DPNAC) had higher productivity and MG adsorption capacity, displaying a predominantly microporous surface (MEV/BET) with chemical activation confirmed by TG/FTOR. DPNAC showed higher MG and protein adsorption capacity than the commercial activated carbon (CAC) did. Results for MG-adsorption capacity by DPNAC did not show significant differences in the presence of protein and carbohydrate, presenting the higher affinity of the adsorbent for the dye. Adsorption isotherms showed DPNAC to be more favorable to MG adsorption than CAC, and to have a good fit to Langmuir-Freundlich model. DPNAC made it possible to reduce costs and allowed the sustainability of the process, leading to increased efficiency in selective pigment removal compared with CAC.Keywords: adsorption; carbohydrate; malachite green; protein; sustainable process.Practical Application: The activated carbon obtained using solid residues of the extraction process of hydrocolloids from Pereskia aculeata Miller proved to be more effective in protein and pigment adsorptions and less effective in carbohydrate adsorption when compared to using a commercial activated carbon. The potential use is waste treatment systems and clarification process.

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Section: Adsorbent Characterizationsupporting

confidence: 70%

Section: Adsorbent Characterizationmentioning

confidence: 67%

Section: Adsorbent Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

et al. 2018

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“…According to the International Coffee Organization, the production of coffee amounted to about 680 million tons in 2008 [52]. Part of the waste is used as fertilizer, but most of the coffee grounds are dumped or burned.…”

Section: Adsorbent Resourcesmentioning

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.

209

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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Removal of Dyes from Effluents Using Biowaste‐Derived Adsorbents

Sharma

McKay

2015

Green Chemistry for Dyes Removal From Wastewater

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Carbons prepared from coffee grounds by H3PO4 activation: Characterization and adsorption of methylene blue and Nylosan Red N-2RBL

Cited by 263 publications

References 37 publications

Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

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

Removal of Dyes from Effluents Using Biowaste‐Derived Adsorbents

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