Fabrication of granular activated carbons derived from spent coffee grounds by entrapment in calcium alginate beads for adsorption of acid orange 7 and methylene blue

Jung, Kyung-Won; Choi, Brian Hyun; Hwang, Min-Jin; Jeong, Tae-Un; Ahn, Kyu‐Hong

doi:10.1016/j.biortech.2016.07.098

Cited by 212 publications

(62 citation statements)

References 35 publications

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“…This is likely due to either the competitive effect between the anions (Cl − ) from NaCl and the negatively charged AO7 molecules for the same active binding sites present on the surface of MSS‐AC or the screening effect of Na + and Cl − ions on the surface of MSS‐AC, resulting in suppression of the electrostatic interactions between the adsorbent and adsorbate . Thus, the experimental results suggest that the adsorption of AO7 on MSS‐AC occurs primarily on the external‐layer of MSS‐AC via electrostatic or Van der Waals interactions .…”

Section: Resultsmentioning

confidence: 93%

“…The results obtained using the sequential model sum of squares and the model summary statistics suggest that among the four different models examined (linear, two‐factor interaction [2FI], quadratic, and cubic), the quadratic model provided the most reasonable description of adsorption capacity, allowing the relationship between the independent variables and the response variable to be elucidated (Supporting Information Table S2). Even though the cubic model exhibited the lowest standard deviation and the highest determination coefficient ( R 2 ) and adjusted‐ R 2 value ( R 2 Adj ), it was found to be inappropriate as a model for further analysis given that the 3 k BBD had insufficient runs to support a full cubic model . Based on these results, the empirical relationships between the adsorption capacity and the independent variables in terms of the coded factors can be expressed as follows:

\begin{matrix} lefttrue \\ Y = 61.35 + 4.35 X_{1} - 0.64 X_{2} + 0.33 X_{3} - 3.05 X_{4} - 0.52 X_{5} + 1.30 X_{1} X_{2} - 1.23 X_{1} X_{3} \\ - 0.23 X_{1} X_{4} + 1.99 X_{1} X_{5} + 1.07 X_{2} X_{3} - 3.32 X_{2} X_{4} + 1.67 X_{2} X_{5} - 1.26 X_{3} X_{4} - 1.18 X_{3} X_{5} \\ + 1.80 X_{4} X_{5} - 23.64 {X_{1}}^{2} - 5.98 {X_{2}}^{2} - 6.72 {X_{3}}^{2} - 8.51 {X_{4}}^{2} - 7.33 {X_{5}}^{2} \end{matrix}

where Y is the adsorption capacity and X 1 , X 2 , X 3 , X 4 , and X 5 are carbonizing temperature (°C), carbonizing time (h), impregnation ratio, activating temperature (°C), and activating time (h), respectively.…”

Section: Resultsmentioning

confidence: 99%

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Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Jung

Lee

2018

Env Prog and Sustain Energy

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In this study, the conditions for preparation of active carbon from municipal sewage sludge (MSS) were optimized from application to the efficient removal of the azo dye, Acid Orange 7 (AO7), from aqueous solutions. To maximize the adsorption capacity (response variable) of the MSS‐derived activated carbon (MSS‐AC), a 3 k Box–Behnken design based on response surface methodology was used to simultaneously optimize five important conditions (independent variables), that is, carbonizing temperature (400–600°C), carbonizing time (0.5–2.0 h), impregnation ratio (1.0–3.5 g KOH/g MSS), activating temperature (600–800°C), and activating time (0.5–2.0 h). The optimal conditions were established as carbonizing temperature: 509°C, carbonizing time: 1.25 h, impregnation ratio: 2.3 g KOH/g MSS, activating temperature: 681°C, and activating time: 1.21 h, with an overall desirability function of 0.991. Further, the effects of various key parameters (solution pH, ionic strength, adsorbent dosage, initial concentration, contact time, and temperature) on the adsorption of AO7 on the as‐synthesized MSS‐AC were elucidated through a series of batch experiments. Adsorption kinetics and isotherm studies revealed that the adsorption process is accurately described by the pseudo‐second order and Sips models. The theoretical maximum adsorption capacity of AO7 was found to be ~1410 mg/g at 25°C, which is superior to that of the other adsorbents reported to date. Additionally, the intraparticle diffusion model suggested that the adsorption was controlled by both external surface adsorption and intraparticle diffusion. Thermodynamic studies also suggested that the adsorption of AO7 by MASS‐AC is exothermic and is governed by physisorption. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S267–S276, 2019

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Section: Resultsmentioning

confidence: 93%

\begin{matrix} lefttrue \\ Y = 61.35 + 4.35 X_{1} - 0.64 X_{2} + 0.33 X_{3} - 3.05 X_{4} - 0.52 X_{5} + 1.30 X_{1} X_{2} - 1.23 X_{1} X_{3} \\ - 0.23 X_{1} X_{4} + 1.99 X_{1} X_{5} + 1.07 X_{2} X_{3} - 3.32 X_{2} X_{4} + 1.67 X_{2} X_{5} - 1.26 X_{3} X_{4} - 1.18 X_{3} X_{5} \\ + 1.80 X_{4} X_{5} - 23.64 {X_{1}}^{2} - 5.98 {X_{2}}^{2} - 6.72 {X_{3}}^{2} - 8.51 {X_{4}}^{2} - 7.33 {X_{5}}^{2} \end{matrix}

Section: Resultsmentioning

confidence: 99%

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Jung

Lee

2018

Env Prog and Sustain Energy

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“…Jung e colaboradores produziram carvão ativado granulado a partir da borra do café encapsulada em camadas de alginato de cálcio, e avaliaram sua capacidade para a absorção dos corantes laranja ácido 7 e azul de metileno, para os quais apresentou uma capacidade máxima de absorção de 665,9 e 986,8 mg/g, respectivamente, sendo superior quando comparado com outros bioadsorventes descritos na literatura, tais como resíduos de chá, com uma capacidade de absorção de laranja ácido 7 de 85,16 mg/g, e carvão ativado feito a partir de casca de banana com uma capacidade de absorção de azul de metileno de 333 mg/g. 95 Outra aplicação dos subprodutos do café é a produção de enzimas. Amilases, proteases, pectinases, xilanases e tanases são algumas das enzimas produzidas a partir de resíduos de café, principalmente polpa, casca e mucilagem.…”

Section: Outras Aplicaçõesunclassified

Coffee: General Aspects and its Use beyond Drink

Durán

2017

Rev. Virtual Quim.

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Abstract:The study of coffee seed reaches different areas of research. Its stimulating effect besides other biological activities, in addition to more than 1,000 volatile chemicals formed during roasting from chemical transformations of its fixed constituents like caffeine, trigoneline, chlorogenic acid, carbohydrate, lipid constituents, including diterpenes and fatty acids (free and esterified), among others, add value to coffee and residues generated until reach its warm beverage. Several by-products are generated during wet and the dry processing, and also by soluble coffee industries. Such byproducts can be a source of raw materials for the food, pharmaceutical and cosmetics, and are often used in power generation in boilers for mechanical dryers and fertilizer. Therefore, this review aims to show the diversity of chemical compounds that can be used from by-products generated in the coffee process.Keywords: Coffee; Chemical compounds; By-products; Biomass. ResumoO estudo do grão de café é realizado por diversas áreas de pesquisa. Seu efeito estimulante e outras atividades biológicas, somados aos mais de 1000 compostos químicos voláteis formados após a torra e oriundos de transformações de seus constituintes fixos como cafeína, trigonelina, ácidos clorogênicos, carboidratos, constituintes lipídicos, incluindo os diterpenos e ácidos graxos (livres e esterificados), entre outros, acrescentam valor agregado ao café e aos resíduos gerados nas diversas etapas até alcançar seu principal objetivo, que é a bebida quente. Diversos resíduos sólidos são gerados durante o processamento de pós-colheita, tanto pela via úmida como pela via seca, e também pelas indústrias de cafés solúveis. Esses resíduos podem ser fonte de matéria-prima para a indústria de alimentos, farmacêutica e cosmética, além de frequentemente serem usados na geração de energia em caldeiras para secadores mecânicos e como fertilizantes. Diante disso, esta revisão pretende mostrar a diversidade de compostos químicos que podem ser aproveitados a partir de resíduos gerados na linha de conhecimento do café.

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“…The toxicant adsorbed on the carbon material is degraded by the microbes, and thereby, regeneration of the packed bed is redundant. The implementation of powdered activated carbon is undesirable in packed column study possessing obstruction to operational layout and owing to its difficulty in recovery or separation of the mixture after adsorption . The extensive application of alginate as a naturally extracted polysaccharide composed of cross‐linking the powdered carbon matrix by hydrogel formation referred to as egg box‐like structure .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of mass transfer effect and response surface optimization for abatement of phenol and cyanide using immobilized carbon alginate beads in a fixed bio‐column reactor

Pathak

Banerjee

Roy

et al. 2020

Asia-Pacific J Chem Eng

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Coke oven sectors dispense phenol and cyanide into the circumferential ecosystem, which becomes a serious concern to the subsistence of the flora and fauna. The current study investigates phenol–cyanide treatment using carbon alginate beads immobilized with mixed bacterial consortium. Response surface using central composite design was contrived for the batch and packed bed bio‐column optimization study. The optimal removal conditions obtained in batch study were 89.77% and 82.33% for phenol and cyanide, respectively, with 10‐g/L adsorbent dosage, time 2 hr, and particle diameter 0.3 cm, whereas 87.22% and 90.97% with 22‐cm column height, column diameter 3 cm, 10‐ml/min flow rate, and 1‐hr operation time. The actual exposure time of the pollutants in the bio‐column reactor was calculated to be 22.15 min. Analysis of variance and model statistics predicted a high coefficient of determination for column operation with R2 = .9950 (phenol), R2 = .9976 (cyanide), and p values < .0001 stating significant model. The quantitative estimation of the combined external mass transfer and biodegradation effect was performed to evaluate correlation as (phenol) and (cyanide) with km = 0.052 and km = 0.055 cm/hr, respectively. The surface morphological study was executed by field emission scanning electron microscopy and Brunauer–Emmett–Teller surface area analysis depicting bacterial film development on the porous carbon matrix for effective treatment of binary system.

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Fabrication of granular activated carbons derived from spent coffee grounds by entrapment in calcium alginate beads for adsorption of acid orange 7 and methylene blue

Cited by 212 publications

References 35 publications

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Coffee: General Aspects and its Use beyond Drink

Evaluation of mass transfer effect and response surface optimization for abatement of phenol and cyanide using immobilized carbon alginate beads in a fixed bio‐column reactor

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