Adsorption Processes in the Removal of Organic Dyes from Wastewaters: Very Recent Developments

López, Félix A.

doi:10.5772/intechopen.94164

Cited by 6 publications

(4 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various initial dye concentrations (20-200 mg/L for MB) during the adsorption process at a given dosage of 10 mg of carbon foam were weighed and then added to 20 mL of solution, which was then agitated at 500 rpm for 10 min. Figure 3a-e demonstrates that an increase in the initial dye concentration induces an acceleration of the dye adsorption process [7]. The particles were magnetically drawn to the bottom of the beaker, and the remaining solution was added to the photocell of the spectrophotometer to produce a concentration reading.…”

Section: Effect Of Initial Concentrationmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and Use of Iron on Carbon Foam for Removal of Organic Dye from Water: Batch Studies

Khumalo,

Lokhat,

Sewpersad

2023

Materials

View full text Add to dashboard Cite

The presence of dyes in effluents from textile industries has a detrimental effect on aquatic ecosystems as it hinders the process of photosynthesis by reducing the penetration of sunlight. The adsorption capacity of a carbon foam-based iron oxide sorbent obtained from natural sources for the removal of organic methylene blue (MB) dye from water was investigated. The adsorption capacities were examined by batch experiments, wherein the impacts of varying iron content, sorbent dosage, contact time, dye concentration, and characterization were assessed. The physical characteristics and surface morphology of the synthesized carbon foam were also investigated. The carbon precursor and iron oxide precursor were coalesced within a singular container and subjected to carbonization process. This resulted in the formation of a porous structure that is capable of effectively providing support to the iron oxide particles. The carbon foam produced is a self-assembled formation that possesses the characteristic shape and underlying network structure reminiscent of bread. As the number of nanoparticles went up, so did the number of active sites. At elevated temperatures, the interactions between the dye molecules were enhanced, resulting in a more efficient process of dye removal. The magnetite sample exhibited endothermic adsorption, and all other samples exhibited exothermic adsorption. The adsorption of MB onto iron supported by carbon foam did not exhibit intraparticle diffusion as the only rate-limiting step for all samples. The adsorption rate was governed by a multistep elementary reaction mechanism in which multiple processes occurred simultaneously. The experimental data in this study may be accurately modeled by the pseudo-second-order kinetic model (R2 > 0.96). Additionally, the Freundlich isotherm best describes the adsorption equilibrium, which is supported by the outstanding fit of data to the model (R2 > 0.999). The findings suggest that the utilization of a natural carbon foam as a support for an immobilized iron oxide sorbent demonstrates considerable effectiveness in the removal of methylene dye from industrial effluent.

show abstract

Section: Effect Of Initial Concentrationmentioning

confidence: 99%

“…Due to the inherent non-biodegradability of most dyes, biological and chemical methods for dye removal have proven insufficient. Adsorption is currently being used for the removal of organic dyes due to its low cost, precision, viability, and easy design requirements [7].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Use of Iron on Carbon Foam for Removal of Organic Dye from Water: Batch Studies

Khumalo,

Lokhat,

Sewpersad

2023

Materials

View full text Add to dashboard Cite

show abstract

“…Various methods and processes are used for removing dyes from water, for instance, electrochemical oxidation ), biological treatment (Paz et al 2017), coagulation-flocculation-based (Gadekar et al 2020), and adsorption methods (Dutta et al 2021). A growing interest in adsorption processes for vigorously removing organic dyes has been observed recently, mainly due to their versatility, effectiveness, easy operating and low cost (Alguacil et al 2021). Different adsorbents generally used for dye removal are activated carbon (Kheddo et al 2020), zeolite (Hammood et al 2021), biochar (Sutar et al 2022), clay (Kausar et al 2018), and metal-organic framework (Uddin et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Preparing Shrimp Shell-Derived Chitosan with Rice Husk-Derived Biochar for Efficient Safranin O Removal from Aqueous Solution

Phương¹,

Thảo²,

Loc³

2023

J. Ecol. Eng.

View full text Add to dashboard Cite

In this study, the shrimp shell-derived chitosan was coated onto rice husk-derived biochar to form chitosan/biochar bio-composite beads. The physicochemical properties of biochar (BC) and chitosan/biochar beads (CS@BC) were characterized by BET, SEM-EDX, FTIR, and pH pzc analyses, which were then tested for their capacity to remove Safranin O (SO) from water. In kinetics, the pseudo-second-order model was found to well represent experimental data, indicating the adsorption was mainly a chemical process. The intra-particle diffusion model was not the sole rate-limiting step, because the results did not pass through the origin. In isotherms, both the Langmuir and Freundlich models described well the equilibrium adsorption data. The CS@BC adsorbent showed adsorption capacity at 77.94 mg/g for SO, which is higher than BC adsorbent with 62.25 mg/g (experimental conditions: pH ~ 7.0, dosage = 0.2 g, contact time = 240 min, and temperature = 298 K). The findings revealed that the biochar-loaded chitosan can improve the adsorption capacity of SO. It is predicted that the enhancement in the functional groups (i.e., -NH 2 and -OH groups) of CS@BC could contribute to the electrostatic interactions and the complexation between SO and CS@BC, thereby enhancing the Safranin O adsorption from water.

show abstract

“…However, these techniques have their own limitations in terms of complicated Toxics 2022, 10, 500 2 of 14 design, low removal performance and high operating and maintenance costs. Adsorption is a widely accepted technology due to its high effectiveness, easy operation, inexpensive cost and the possibility of scaling-up to an industrial scale from a laboratory or a pilot scale [11]. Nevertheless, the efficiency of an adsorption process is largely dependent on the adsorbent used in the process [12].…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Modified Biochar and Unmodified Biochar for Methyl Orange: Adsorption Characteristics and Mechanism Exploration

Loc

Tuyen

Chi

et al. 2022

Toxics

View full text Add to dashboard Cite

In this study, shrimp shell-derived chitosan (CS) and rice husk-derived biochar (RHB) were produced; CS and RHB were then used to synthesize chitosan-modified biochar (CSBC) hydrogel beads. N2 adsorption (77K), SEM-EDX and FT-IR techniques were used to evaluate the physicochemical properties of the adsorbents. A batch experiment was conducted to test the methyl orange (MO) adsorption performance of RHB and CSBC. The results showed that the MO adsorption process was strongly pH-dependent. The kinetics were well described by the pseudo-second-order and intra-particle diffusion models, assuming the chemisorption and intraparticle diffusion mechanisms govern the adsorption process. Homogeneous adsorption for MO on the surface of RHB and CSBC was also assumed since the isotherm data showed the best-fit to the Langmuir model. Under the experimental conditions of initial pH 3, dosage 0.2 g, contact time 240 min and temperature 298K, the maximum adsorption capacity of CSBC and RHB for MO dye adsorption was 38.75 mg.g−1 and 31.63 mg.g−1, respectively. This result demonstrated that biochar had better performance after modification with chitosan, which provided more functional groups (i.e., −NH2 and −OH groups) for enhanced electrostatic interactions and complexation between MO and CSBC. Overall, CSBC is an effective adsorbent for the removal of MO from aqueous solution.

show abstract

Adsorption Processes in the Removal of Organic Dyes from Wastewaters: Very Recent Developments

Cited by 6 publications

References 64 publications

Preparation and Use of Iron on Carbon Foam for Removal of Organic Dye from Water: Batch Studies

Preparation and Use of Iron on Carbon Foam for Removal of Organic Dye from Water: Batch Studies

Preparing Shrimp Shell-Derived Chitosan with Rice Husk-Derived Biochar for Efficient Safranin O Removal from Aqueous Solution

Chitosan-Modified Biochar and Unmodified Biochar for Methyl Orange: Adsorption Characteristics and Mechanism Exploration

Contact Info

Product

Resources

About