scholarly journals Assessment of Untreated Coffee Wastes for the Removal of Chromium (VI) from Aqueous Medium

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Ilyasse Loulidi ◽  
Fatima Boukhlifi ◽  
Mbarka Ouchabi ◽  
Abdelouahed Amar ◽  
Maria Jabri ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Cost Estimation ◽  
Aquatic Ecosystems ◽  
Adsorption Equilibrium ◽  
Low Cost ◽  
Optimum Conditions ◽  
Spent Coffee Grounds ◽  
Order Model ◽  
Chromium Vi ◽  
Coffee Grounds

Industrial discharges loaded with heavy metals present several problems for aquatic ecosystems and human health. In this context, the present study aims to evaluate the potential of raw spent coffee grounds to remove chromium from an aqueous medium. A structural and textural study of coffee grounds was carried out by FTIR, XRD, and TGA analysis. The optimum conditions for the removal of Cr(VI), for a solution with an initial concentration of 100 mg/l, were adsorbent dose 2.5 g/l, pH 4.0, and contact time 90 min. The adsorption equilibrium results show that the Langmuir isotherm best describes the process with an adsorption capacity of 42.9 mg/g and that the adsorption kinetics follows the pseudosecond-order model. The calculated thermodynamic parameters showed that the adsorption is exothermic and spontaneous. The activation energy value (Ea) indicated that the retention is physisorptive in nature. The regeneration of the adsorbent was carried out by three eluents, among which HCl was the best. Finally, a brief cost estimation showed the great potential of coffee grounds as a low-cost adsorbent.

scholarly journals Statistical Optimization of Alkali Pretreatment to Improve Sugars Recovery from Spent Coffee Grounds and Utilization in Lactic Acid Fermentation

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 494 ◽  
Author(s):  
Kang Hyun Lee ◽  
Ye Won Jang ◽  
Jeongho Lee ◽  
Seunghee Kim ◽  
Chulhwan Park ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Enzymatic Hydrolysis ◽  
Lactic Acid Production ◽  
Complex Loading ◽  
Lactic Acid Fermentation ◽  
Optimum Conditions ◽  
Spent Coffee Grounds ◽  
Alkali Pretreatment ◽  
Acid Fermentation ◽  
Coffee Grounds

Biorefinery, which utilizes carbon-neutral biomass as a resource, is attracting attention as a significant alternative in a modern society confronted with climate change. In this study, spent coffee grounds (SCGs) were used as the feedstock for lactic acid fermentation. In order to improve sugar conversion, alkali pretreatment was optimized by a statistical method, namely response surface methodology (RSM). The optimum conditions for the alkali pretreatment of SCGs were determined as follows: 75 °C, 3% potassium hydroxide (KOH) and a time of 2.8 h. The optimum conditions for enzymatic hydrolysis of pretreated SCGs were determined as follows: enzyme complex loading of 30-unit cellulase, 15-unit cellobiase and 50-unit mannanase per g biomass and a reaction time of 96 h. SCG hydrolysates were used as the carbon source for Lactobacillus cultivation, and the conversions of lactic acid by L. brevis ATCC 8287 and L. parabuchneri ATCC 49374 were 40.1% and 55.8%, respectively. Finally, the maximum lactic acid production by L. parabuchneri ATCC 49374 was estimated to be 101.2 g based on 1000 g of SCGs through the optimization of alkali pretreatment and enzymatic hydrolysis.

scholarly journals Utilization of Waste-Based Sorbents for Removal of Pharmaceuticals from Water: A Review

2021 ◽  
Vol 29 (48) ◽  
pp. 22-36
Author(s):  
Lenka Blinová ◽  
Maroš Sirotiak
Keyword(s):  
Water Contamination ◽  
Human Life ◽  
Low Cost ◽  
Industrial Wastes ◽  
Contaminated Water ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
By Products

Abstract Nowadays, the water contamination which is due to pharmaceuticals is increasing and alarming. The pharmaceuticals in water are very hazardous and toxic not only for the human life but also for environment. One of the promising methods of removing pharmaceuticals from the contaminated water is adsorption. Agricultural and industrial wastes or by-products can be used as low-cost adsorbents for pharmaceuticals removal. Low-cost adsorbents provide particular economic and environmental advantages. This paper presents an overview of utilizing of the waste-based adsorbents (mainly spent coffee grounds) for the removal of pharmaceuticals from water.

Removal of chromium (VI) from water using adsorbent derived from spent coffee grounds

2017 ◽  
Vol 16 (1) ◽  
pp. 101-112 ◽  
Author(s):  
G. V. Krishna Mohan ◽  
A. Naga Babu ◽  
K. Kalpana ◽  
K. Ravindhranath
Keyword(s):  
Spent Coffee Grounds ◽  
Chromium Vi ◽  
Coffee Grounds

scholarly journals Sustainable Exploitation of Coffee Silverskin in Water Remediation

2018 ◽  
Vol 10 (10) ◽  
pp. 3547 ◽  
Author(s):  
Angela Malara ◽  
Emilia Paone ◽  
Patrizia Frontera ◽  
Lucio Bonaccorsi ◽  
Giuseppe Panzera ◽  
...  
Keyword(s):  
Adsorption Equilibrium ◽  
Water Remediation ◽  
Isotherm Models ◽  
Adsorption Efficiency ◽  
Spent Coffee Grounds ◽  
Ion Removal ◽  
Coffee Silverskin ◽  
Coffee Grounds ◽  
Adsorption Data ◽  
Potential Toxic Metals

Coffee silverskin (CS), the main solid waste produced from the coffee industry, has efficiently been used as adsorbent material to remove potential toxic metals (PTMs). In order to assess its suitability in water remediation, kinetic adsorption experiments of Cu2+, Zn2+, and Ni2+ ions from wastewater were carried out and the adsorption performance of the waste material was compared with that of another well-known waste from coffee industry, spent coffee grounds (SCG). By using CS as sorbent material, ion removal follows the order Cu2+ > Zn2+ > Ni2+ with the adsorption equilibrium occurring after about 20 min. The adsorption efficiency of Ni2+ ions is the same for both investigated materials, while Cu2+ and Zn2+ ions are removed to a lesser extent by using CS. Equilibrium-adsorption data were analyzed using two different isotherm models (Langmuir and Freundlich), demonstrating that monolayer-type adsorption occurs on both CS and SCG surfaces. The overall results support the use of coffee silverskin as a new inexpensive adsorbent material for PTMs from wastewater.

scholarly journals Utilization of Spent Coffee Grounds for Removal of Hazardous Substances from Water: A Review

2019 ◽  
Vol 27 (44) ◽  
pp. 145-152
Author(s):  
Lenka Blinová ◽  
Maroš Sirotiak
Keyword(s):  
Water Consumption ◽  
Suspended Solids ◽  
Environmental Problem ◽  
Low Cost ◽  
Hazardous Substances ◽  
Waste Materials ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Textile Industries ◽  
The One

Abstract Water is one of the most important substances on earth; nowadays, its pollution is one of the main environmental problems. Textile industries pose a significant environmental problem for earth. Firstly, it is due to their huge water consumption, and secondly, they produce a lot of wastewater contaminated with dyes, chemicals, suspended solids, etc. These contaminants can make water unsuitable for the desired purposes (e.g., drinking, watering, washing and showering). The one of the promising methods for the removal of dyes from the contaminated wastewater is adsorption. In this process, we can use low cost waste materials as an adsorbent. This paper presents an overview of utilization of the spent coffee grounds for the removal of dyes from wastewater.

scholarly journals Adsorption of Ni2+ and Cd2+ from Water by Calcium Alginate/Spent Coffee Grounds Composite Beads

2019 ◽  
Vol 9 (21) ◽  
pp. 4531 ◽  
Author(s):  
Roberto Torres-Caban ◽  
Carmen A. Vega-Olivencia ◽  
Nairmen Mina-Camilde
Keyword(s):  
Heavy Metals ◽  
Calcium Alginate ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Point Of Zero Charge ◽  
Order Kinetic ◽  
Spent Coffee Grounds ◽  
Composite Beads ◽  
Coffee Grounds

The use of heavy metals in technological applications has led to detrimental effects on human health and the environment. Activated carbon and ion-exchange resins are commonly used to remove pollutants but they are expensive. Therefore, the research of low-cost alternatives derived from natural resources and organic wastes is being considered. The aim of this study considers the use of Calcium Alginate/Spent Coffee Grounds (CA–SCGs) composite beads to adsorb heavy metals from aqueous solutions, particularly, the removal of Ni2+ or Cd2+ at concentrations from 10 ppm to 100 ppm. CA–SCGs beads were made of equal proportions of alginate and spent coffee grounds and compared with calcium alginate beads (CA beads) and spent coffee grounds (SCGs) in terms of capacity and rate of adsorption. Three cycles of adsorption/desorption were done. The beads were characterized by Scanning Electron Microscopy coupled with an energy-dispersive X-ray spectroscopy (SEM–EDX), Fourier-transform infrared spectroscopy (FT–IR), Raman spectroscopy, and point of zero charge. Langmuir, Freundlich, and Sips models, and a pseudo-second-order kinetic equation were used. Sips model showed the best correlation with the adsorption of CA–SCGs beads with capacities of adsorption of 91.18 mg/g for cadmium and 20.96 mg/g for nickel. CA–SCGs beads had a greater adsorption than the CA beads, achieving adsorption percentages close to 100% than alginate alone, showing their effectiveness in heavy metal removal.

scholarly journals Preparation of Activated Carbons from Spent Coffee Grounds and Coffee Parchment and Assessment of Their Adsorbent Efficiency

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1396
Author(s):  
Gustavo A. Figueroa Campos ◽  
Jeffrey Paulo H. Perez ◽  
Inga Block ◽  
Sorel Tchewonpi Sagu ◽  
Pedro Saravia Celis ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Activated Carbons ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Spent Coffee Grounds ◽  
Hydrophobic Compounds ◽  
Coffee Grounds ◽  
By Products

The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investigated. The aim of this work was to prepare activated carbon from spent coffee grounds and parchment, and to assess their adsorption performance. The co-calcination processing with calcium carbonate was used to prepare the activated carbons, and their adsorption capacity for organic acids, phenolic compounds and proteins was evaluated. Both spent coffee grounds and parchment showed yields after the calcination and washing treatments of around 9.0%. The adsorption of lactic acid was found to be optimal at pH 2. The maximum adsorption capacity of lactic acid with standard commercial granular activated carbon was 73.78 mg/g, while the values of 32.33 and 14.73 mg/g were registered for the parchment and spent coffee grounds activated carbons, respectively. The Langmuir isotherm showed that lactic acid was adsorbed as a monolayer and distributed homogeneously on the surface. Around 50% of total phenols and protein content from coffee wastewater were adsorbed after treatment with the prepared activated carbons, while 44, 43, and up to 84% of hydrophobic compounds were removed using parchment, spent coffee grounds and commercial activated carbon, respectively; the adsorption efficiencies of hydrophilic compounds ranged between 13 and 48%. Finally, these results illustrate the potential valorization of coffee by-products parchment and spent coffee grounds into activated carbon and their use as low-cost adsorbent for the removal of organic compounds from aqueous solutions.

scholarly journals Synthesis and Characterization of Novel Rice Husk Hydrogel and Cross Linked Acrylic Acid-Rice Husk Hydrogel for the Adsorption of Chromium(VI) from Wastewater

2020 ◽  
Vol 32 (9) ◽  
pp. 2365-2370
Author(s):  
AAKRITI VERMA ◽  
KALPANA SINGH ◽  
KUSHAGRA RAJENDRA
Keyword(s):  
Rice Husk ◽  
Adsorption Equilibrium ◽  
Low Cost ◽  
Isotherm Models ◽  
Chemical Parameters ◽  
Chromium Vi ◽  
Physico Chemical ◽  
Effective Removal ◽  
Optimized Conditions

The main purpose of this research is to develop a low-cost and novel bioadsorbent hydrogel from rice husk (PRH) and modified rice husk (MRH) by carboxymethylation and grafting for the effective removal of chromium(VI) from aqueous solutions. The characterization and physico-chemical parameters of the bioadsorbents (PRH and MRH) was also performed. It was found that -CHO, >C=O, C-OH, Si-OH and -Si-H groups widely contributed towards the adsorption of chromium(VI) into the surface of bioadsorbents. The adsorption studies had been conducted using batch experiments. The adsorption equilibrium were analyzed and described by Freundlich, Langmuir and Dubinin-Radushkevish (D-R) isotherm models. It was observed that maximum adsorption of chromium(VI) was attained at pH 2. The optimized conditions regarding the removal of Cr(VI) using PRH (65%) and MRH (78%) as bioadsorbents were at 0.5 g/L of adsorbent dose, 120 min of contact time and pH 2. The results showed that rice husk residue based hydrogel has the potential to be used as a lowcost biosorbent for the removal of Cr(VI) from wastewater.

scholarly journals Extraction of Polyphenols and Synthesis of New Activated Carbon from Spent Coffee Grounds

2019 ◽  
Author(s):  
Félix Antonio López ◽  
Marina Ramón Gonçalves ◽  
Lorena Alcaraz ◽  
Susana Pérez Ferreras ◽  
María Eugenia León González ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Potassium Hydroxide ◽  
Alcoholic Solution ◽  
Maximum Adsorption Capacity ◽  
Optimum Conditions ◽  
Spent Coffee Grounds ◽  
Central Values ◽  
Coffee Grounds ◽  
Stage Process ◽  
Extraction Stage

A valorization process of spent coffee grounds (SCG) was studied. Thus, a two-stage process, a stage of extraction of the polyphenols and a stage of obtaining activated carbon (AC) by a carbonization process, was performed. The extraction was carried out with a hydro-alcoholic solution in a pressure reactor, modifying time and temperature. To optimize the extraction of polyphenols, a two-level factorial design with three replications at the central values was used. The best results were obtained by performing the extraction at 80 ºC during 30 min, using a mixture of EtOH:H2O 1:1 (v/v) as extraction solution. Caffeine and chlorogenic acid were the most abundant compounds in the analysed extracts, ranging from 0.09 to 4.8 mg∙g-1 and 0.06 to 9.7 mg∙g-1, respectively. The precursor obtained in the extraction stage were transformed into AC. An experimental design was realized in order to analyze the influence of different variables in the AC obtained process (reaction time and amount of potassium hydroxide used). Actived carbons with BET specific surface (SBET) comprised between 1600 m2∙g-1 and 2330 m2∙g-1 had a microporous surface. Under the optimum conditions, the obtained AC presented a maximum adsorption capacity of methylene blue (qm) between 411 mg∙g-1 and 813 mg∙g-1.

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