Novel bentonite/zeolite-NaP composite efficiently removes methylene blue and Congo red dyes (original) (raw)
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Natural Bentonite Clay and Its Composites for Dye Removal: Current State and Future Potential
Dye bearing effluent have become one of the most dangerous environmental complications, and the removal of synthetic dyes (e.g., acid dyes, azoic (or naphthol) dyes, basic dyes, chrome (or mordant) dyes, developed (or diazo) dyes, direct dyes, disperse (or acetate) dyes, reactive (or fiber-reactive) dyes, sulphur dyes, Vat dyes) from water and wastewater is of unique concern because they are unmanageable and sustained in the environment. As of late, bentonites and its composite have been moderately applied to the removal of dye bearing effluent from contaminated water through adsorption processes. This paper reviews recent progress in the application of bentonites and its composites for the removal of synthetic dyes from contaminated water. The purpose of this article is to provide a comprehensive literature review of the performance of adsorption process in removing synthetic dyes from water and wastewater by using bentonites and its composites. This study assesses the removal data compare from recent research relating to various dyes during the adsorption process. The paper discusses removal efficiencies, thermodynamics and reaction kinetics. Bentonites are anticipated to have significant potential for comprehensive application to wastewater treatment in the near future. Various challenges encountered in using bentonites and its composite are highlighted and a number of future prospects for the bentonites based adsorbents are proposed.
Journal of Particle Science and Technology, 2021
• Methylene blue can be successfully adsorbed (96.3%) by 8-hydroxyquinoline modified bentonite in batch design. • Langmuir and Freundlish models provide information on maximum sorption capacity. • The maximum adsorption capacity was 526.3 mg.g-1 with 100 ppm initial concentration of methylene blue, 120 minutes of contact time, and 0.1 g of modified bentonite sample. • Modified bentonite has proven to be a promising economic material and recommended for the simultaneous removal of cobalt and methylene blue from aqueous solutions.
2020
The current paper is paying attention to the synthesis of a low-cost, abundant and efficient hybrid activated bentonite–alginate composite ABent/A. Hybrid composite morphology was determined through FTIR, XRPD, and pH PZC . The operational conditions for the retention of two dyes used in the textile industry (methylene blue and crystal violet) from aqueous mediums were evaluated. Results showed that MB and CV adsorbed amount on ABent/A was 780 and 546 mg/g, respectively. Kinetic Lagergren’s and Ho and McKay’s models provide the best result for the MB and CV adsorption on the prepared adsorbent, respectively. Langmuir isotherm model gives the best analyses of the experimentation, justifying a monolayer and a homogeneous nature of adsorption process. Results indicate also that the operational conditions studied affect significantly dyes removal. Reusability study of ABent/A for dyes was also investigated according to the type of desorbing agents. MB regeneration was found 98.92% using...
International Journal of Biological Macromolecules, 2018
Using the extrusion method, novel hybrid beads were prepared from natural bentonite and alginate. Alginate to clay ratios was varied (1/1; 1/2 and 1/3) and used to eliminate two dyes (methylene blue and Congo red).Adsorbents were characterized by Fourier transformed infrared spectroscopy, X-ray diffraction, Brunauer-Emmett-Teller method (BET) from N 2 adsorption-desorption isotherm at 77 K, and the point of zero charge (pH PZC). The adsorption of methylene blue and Congo red was studied according to different parameters. The results showed that isotherms were well described by the Langmuir model justifying monolayer and homogeneous adsorption. Kinetics were well followed the pseudo-second-order model.
Nanomaterials, 2021
Adsorption is an effective method of removing harmful pollutants from air and water. In the present study, zeolites prepared by sol-gel method from two Ecuadorian clays were combined with precursor clays and the ZnTiO3/TiO2 semiconductor for adsorbing methylene blue (MB) as a water contaminant. The synthesized compounds were characterized using powder X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive X-ray, and surface area measurement. These compounds were combined to form cylindrical extrudates of 0.2 cm (diameter) and 1.0 cm (length). The adsorption characteristics of the composites were measured using batch sorption studies as a function of pH, initial concentration, and contact time. The pseudo-second-order model and the Langmuir isotherm model were better suited to the adsorption process. The equilibrium state was achieved around 180 min of adsorption, and a pH of 7 was established as the optimal operating condition. The maximum adsorption ...
Advanced Materials Research, 2014
This study reports on the modification of natural bentonite by a cationic polyelectrolyte, which is a lignin-based aldehyde-ketone resin, and the application of this modified clay as adsorbent in the removal of reactive dyes from aqueous solution. Modified bentonite was characterized by IR and zeta-potential test, its dye removal performance was evaluated. Results show that intermolecular interaction and electrostatic attraction between dyes and adsorbent are responsible for the adsorption behavior. The removal of reactive dyes increased with increasing temperature and the optimum pH range was 4.0-6.5. The negative values of ΔG reflected the spontaneous adsorption and the values of ΔH showed that it was a combination of chemical and physical adsorption. Equilibrium adsorption data fitted well to Langmuir isotherm and the adsorption capacity for reactive red and reactive blue was 125.0 and 159.2 mg/g, respectively.
Scientific Reports, 2023
A systematic study integrating laboratory, analytical, and case study field trial was conducted to figure out the effective adsorbent that could be used for the removal of Congo red (CR) dye from industrial wastewater effluent. The ability of the zeolite (Z) to adsorb CR dye from aqueous solutions was evaluated after it was modified by the Cystoseira compressa algae (CC) (Egyptian marine algae). Zeolite, CC algae were combined together in order to form the new composite zeolite/algae composite (ZCC) using wet impregnation technique and then characterized by the aid of different techniques. A noticeable enhancement in the adsorption capacity of newly synthesized ZCC was observed if compared to Z and CC, particularly at low CR concentrations. The batch style experiment was selected to figure out the impact of various experimental conditions on the adsorption behavior of different adsorbents. Moreover, isotherms and kinetics were estimated. According to the experimental results, the newly synthesized ZCC composite might be applied optimistically as an adsorbent for eliminating anionic dye molecules from industrial wastewater at low dye concentration. The dye adsorption on Z and ZCC followed the Langmuir isotherm, while that of CC followed the Freundlich isotherm. The dye adsorption kinetics on ZCC, CC, and Z were agreed with Elovich, intra-particle, and pseudo-secondorder kinetic models, correspondingly. Adsorption mechanisms were also assessed using Weber's intraparticle diffusion model. Finally, field tests showed that the newly synthesized sorbent has a 98.5% efficient in eliminating dyes from industrial wastewater, authorizing the foundation for a recent eco-friendly adsorbent that facilitate industrial wastewater reuse. No one can deny that water is a vital source of life on Earth. Although industrialization and innovation have enhanced mankind's way of life, they are also the main cause of pollution to clean water resources 1. Heavy metal, dye, pharmaceutical, and surfactant molecules, personal care items, pesticides, and some other substances are not only daily sources that pollute pure and restricted water resources daily but also have a dangerous effect on all living things 2-6. Synthetic dyes that are used in a variety of industries, including paper, rubber, textiles, dyes,
Adsorption Science & Technology, 2003
An improvement in the adsorption capacity of naturally available bentonite towards water pollutants such as Methylene Blue dye (MBD) is certainly needed. For this purpose, sodium bentonite was activated by two methods: (1) treatment with sodium dodecyl sulphate (SDS) as an ionic surfactant and (2) thermal treatment in an oven operated at 850°C. Batch adsorption tests were carried out on removing MBD from aqueous solution using the above-mentioned bentonites. It was found that the effectiveness of bentonites towards MBD removal was in the following order: thermal-bentonite > SDS-bentonite > natural bentonite. X-Ray diffraction analysis showed that an increase in the microscopic bentonite platelets on treatment with SDS was the reason behind the higher uptake of MBD. An increase in sorbent concentration or initial pH value of the solutions resulted in a greater removal of MBD from the solution. An increase in temperature led to an increase in MBD uptake by the bentonites studied...
2021
The present work focuses on intercalating a natural bentonite with an organo-inorganic specieobtained by hydrolysis of 3-aminopropyltrimethoxysilane in order to improve its adsorption capacity. The material obtained is used in the deppolution of water polluted by dyes. Methylene blue is chosen as a model pollutant. In order to be able to characterize this clay after modification, we used several physico-chemical and mineralogical analysis techniques such as X-ray diffraction, infrared spectroscopy, chemical and thermal analysis. The cationic exchange capacity was determined as well. In addition, with a view to optimization, the effects of several adsorption factors, including time, pH, dye concentration, and masse of clay on the adsorption capacity of methylene blue by the adsorbent were assessed as well. The results of this study showed that Langmuir isotherm is the model which best characterized the adsorption of methylene blue by the developed adsorbent (Bent-APTES) with a capaci...