Adsorption of Congo Red from Aqueous Solutions by Porous Soybean Curd Xerogels

Zhao, Zongbin; Li, Yanhui; Du, Qiuju; Li, Qi

doi:10.2478/pjct-2018-0044

Cited by 27 publications

(13 citation statements)

References 51 publications

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“…A similar result is obtained by Sadaf and Bhatti [15,16]. Zhang et al [20] explored the removal of congo red onto soybean curd. Adsorption rate at the first 200 min was very rapid due to the interaction between the congo red molecules and the active adsorption sites on the adsorbent surface.…”

Section: Effect Of Contact Timesupporting

confidence: 75%

“…A similar result was obtained for the adsorption of reactive black 5 on peanut hull [17]. In another study [20], adsorbent dose effect on the adsorption of congo red onto soybean curd was investigated. According to their results, the removal rate of congo red increases with increasing the adsorbent amount, due to the increased active adsorption sites at a higher adsorbent dose.…”

Section: Effect Of Adsorbent Amountsupporting

confidence: 70%

“…This result may happen due to chemisorption of congo red dye molecules on the peanut hull [11,17]. In literature similar results have been obtained for adsorption of congo red using various adsorbents [11,20,24].…”

Section: Kinetic Models For Congo Red Adsorption On Peanut Hullsupporting

confidence: 58%

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Congo Red Removal From Aqueous Solutions by Adsorption on Peanut Hull

Fındık

2020

Mühendislik Bilimleri Ve Araştırmaları Dergisi

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Congo red is one of the anionic diazo dyes and is widely used in the dying process for many industries. Industries such as textile, leather, paper, rubber, plastics and cosmetics are used the congo red dye. In this study, removal of congo red from aqueous solutions by adsorption on peanut hull was explored. The effects of several parameters like contact time, initial concentration, adsorbent amount, particle size and temperature were researched. A kinetic study was also performed. Adsorption rate increases up to 60mg/L initial concentration and then decreases. 60mg/L may be considered as an optimum initial concentration in the initial concentration range studied. The removal of congo red increases with increasing absorbent amount. The removal of congo red decreases with increasing adsorbent particle size and temperature as well. The adsorption equilibriums were reached at about 60min. Adsorption kinetics of congo red on the peanut hull followed by pseudo second-order kinetic model.

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Section: Effect Of Contact Timesupporting

confidence: 75%

Section: Effect Of Adsorbent Amountsupporting

confidence: 70%

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Congo Red Removal From Aqueous Solutions by Adsorption on Peanut Hull

Fındık

2020

Mühendislik Bilimleri Ve Araştırmaları Dergisi

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“…Some efforts need to be given to minimize Congo red dye waste before being discharged into the waters considering its effects. Several methods can be used to minimize the dye content in textile industry waste, including coagulation [7], electrocoagulation, photodegradation, ozonation [8], biodegradation [9], electrolysis, and oxidation methods. However, these methods are less effective in dealing with textile dye waste and often arise some problems for the environment.…”

Section: Introductionmentioning

confidence: 99%

Mg/Al-CH, Ni/Al-CH and Zn/Al-CH, as adsorbents for Congo Red removal in aqueous solution

Siregar

Normah

Juleanti

et al. 2021

CST

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In this study, chitosan was extracted from shrimp shells by demineralization and deproteination processes. The extracted chitosan was used to modify the layered double hydroxide and used as an adsorbent for the removal of congo red from aqueous solutions. Composites were successfully synthesized using M2+/Al (M2+ = Zn, Mg, Ni) and chitosan (CH) and the samples obtained were characterized using XRD and FTIR. The X-ray diffraction (XRD) pattern appeared at the layered double hydroxide peak of 2? = 11.63°; 23.00°; 35.16°; and 61.59° and chitosan at 2? = 7.93° and 19.35. The composite appearing in the layered double hydroxide and chitosan indicated that the composite material has been successfully synthesized. The XRD diffraction patterns of Zn/Al-CH, Ni/Al-CH, and Mg/Al-CH showed low crystallinity. The Fourier Transform Infrared (FTIR) spectra verifying absorption spectrum showed the presence of two bands at 3448 cm-1, 1382cm-1 characteristic to both chitosan and LDH. Adsorption of Congo Red (CR) followed the pseudo-second-order and Langmuir isotherm models. The adsorption capacities of Zn/Al-CH, Ni/Al-CH, and Mg/Al-CH were 181.818 mg/g, 227.273 mg/g, and 344.828 mg/g, respectively. The layered double hydroxide-chitosan composite adsorption was endothermically characterized by positive enthalpy and entropy values. On the other hand, the adsorption spontaneously was characterized by a negative Gibbs free energy value. The composites in this study were formed from LDH modified from chitosan extracted from shrimp shells to form Zn/Al-CH, Ni/Al-CH, and Mg/Al-CH. The results of the characterization showed a number of characteristics that resembled the constituent materials in the form of LDH and chitosan. After being applied as an adsorbent to absorb Congo red dye, it then showed the most effective results using Mg/Al-CH adsorbent with an adsorption capacity of 344.828 mg/g.

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“…Moreover, the peaks at 1,439-1,450 cm À1 and 2,927-2,928 cm À1 may be attributed to the stretching of C-H with the saturated structure (Zhang et al, 2018). To summarize, the curve c representing the composite comprises of all the functional groups characteristic of GT and GO.…”

Section: Removal Behavior Of Methylene Bluementioning

confidence: 96%

Removal behavior of methylene blue from graphene oxide/gluten composite material: kinetics, isotherms and thermodynamics

Zhang

et al. 2020

IJCST

Self Cite

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PurposeIn order to discover a new adsorbent that can be used to purify dye wastewater in the textile and apparel industry, a novel type of graphene oxide/gluten composite material using an improved acid bath coagulation method was synthesized, which can remove methylene blue in an aqueous environment.Design/methodology/approachAfter experimentally compounding different ratios of graphene oxide and gluten, the graphene oxide/gluten composite material with 20% graphene oxide content and superlative adsorption effect was chosen. The synthesized material was characterized by different techniques such as FT-IR and SEM, indicating the microstructure of the material and the success of the composite. Various factors were considered, namely, the influence of temperature, dosage, pH and contact time. The isotherms, kinetics and thermodynamic parameters were successively discussed.FindingsThe qmax value of 214.29 mg/g of the material was higher compared to the general sorbent, thus, the graphene oxide/gluten composite material was a suitable sorbent for methylene blue removal. Overall, the graphene oxide/gluten composite material can be considered as an effectual and prospective adsorbent to remove methylene blue in the textile and apparel industrial effluent.Originality/valueGraphene oxide is a potentially excellent sorbent. However, the high dispersibility of GO is detrimental to adsorption, it disperses rapidly in an aqueous solution making separation and recovery difficult. The high load capacity and recyclability of gluten as a colloid make it a suitable carrier for fixing GO. Studies on the combination of GO and GT into composite adsorption material and for the removal of dyes from dyeing wastewater have not been reported. The composite material research on GO and GT can provide new ideas for the research of these kinds of materials and contribute to its wider and convenient application in wastewater treatment.

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Adsorption of Congo Red from Aqueous Solutions by Porous Soybean Curd Xerogels

Cited by 27 publications

References 51 publications

Congo Red Removal From Aqueous Solutions by Adsorption on Peanut Hull

Congo Red Removal From Aqueous Solutions by Adsorption on Peanut Hull

Mg/Al-CH, Ni/Al-CH and Zn/Al-CH, as adsorbents for Congo Red removal in aqueous solution

Removal behavior of methylene blue from graphene oxide/gluten composite material: kinetics, isotherms and thermodynamics

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