Stirring-ageing technique to develop zirconium-pillared bentonite clay along with its surface profiling using various spectroscopic techniques

Mahadevan, Harsha; Krishnan, K. Anoop; Pillai, Renjith Rajan; Sudhakaran, Sandhya

doi:10.1007/s11164-019-03982-2

Cited by 9 publications

(5 citation statements)

References 55 publications

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“…Most authors interpret the mechanism of adsorption on natural clay minerals of aluminosilicate composition as ion exchange [26]. But based on the data we have obtained; it follows that the mechanism of adsorption on bentonite clays is complex.…”

Section: Sorbent Samplementioning

confidence: 70%

Comparative Study of the Physico-Chemical Properties of Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminium (III) Polyhydroxocations

Kussainova,

Tazhkenova,

Kazarinov

et al. 2023

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A comparative study of the physicochemical properties of natural bentonite clays of Pogodayevo (Republic of Kazakhstan, mod. 1) and Dash-Salakhli (Republic of Azerbaijan, mod. 2) deposits and modification of the bentonite clay with polyhydroxocations of iron (III) and aluminium (III). The amount of bentonite in the concentration of iron (aluminum) was 5 mmol Me3+/g. It was established that the modification of natural bentonites using polyhydroxocations of iron (III) (mod. 1_Fe_5-c, mod. 2_Fe_5-c) and aluminum (III) (mod. 1_Al_5-c, mod. 2_Al_5-c) by the method of “co-precipitation” leads to a change in their chemical composition, structural and sorption properties. The results showed that hydroxy-aluminum cations ([Al3O4(OH)24(H2O)12]7+) and poly-hydroxyl-Fe or polyoxo-Fe were intercalated into clay layers, which led to an increase in the values of d001 and specific surface areas compared to those of the original bentonite, from 37 to 120 m2/g for the Pogodaevo bentonite and from 51 to 172 m2/g respectively, for bentonite from the Dash-Salakhli deposit. It is shown that modified sorbents based on natural bentonite are finely porous objects with a predominance of pores of 1.5–8.0 nm in size. As a result, there is a significant increase in the specific surface area of sorbents. Modification of bentonite with polyhydroxocations of iron (III) and aluminum (III) by the “co-precipitation” method also leads to an increase in the sorption capacity of the sorbents obtained with respect to nickel (II) cations. Modified bentonites were used for the adsorption of Ni (II) ions from the model solution. Ni (II) was absorbed in a neutral pH solution. The study of equilibrium adsorption showed that the data are in good agreement with the Langmuir isotherm model. The maximum adsorption capacity of the Ni (II) obtained from the Langmuir equation was 25.0 mg/g (mod. 1_Al_5-c), 18.2 mg/g (mod. 2_Al_5-c) for Al-bentonite and 16.7 mg/g (mod. 1_Fe_5-c), 10.1 (mod. 2_Fe_5-c) for Fe-bentonite. The kinetics of adsorption is considered. The high content of Al-OH anion exchange centers in them determines the higher sorption activity of Al-modified bentonites.

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Section: Sorbent Samplementioning

confidence: 70%

Comparative Study of the Physico-Chemical Properties of Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminium (III) Polyhydroxocations

Kussainova,

Tazhkenova,

Kazarinov

et al. 2023

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“…Mudzielwana et al 63 stated that the modification of bentonite could change the surface morphology of bentonite. Mahadevan et al 23 showed that the modification of bentonite using Zr changed its surface morphology with the ability to promote a large surface area with more porosity. It can be seen that the modification using zirconium nitride gave different results than that with zirconium phosphide, whereas ZrP showed a sharp multiangle granule-like structure, and ZrN exhibited a needle-like shape with a distinctive structure.…”

Section: Resultsmentioning

confidence: 99%

“…These features are strongly related to the efficient adsorption of large molecules in the pores of bentonite; it is also thermally stable, and the presence of strong acid sites of modified bentonite is highly suitable for catalyzing the hydrocracking reactions. 22 Modified bentonite, in addition, has recently gained popularity as a solid catalyst due to its acidity, which can be modulated according to clay minerals, 23 relative abundance, low cost, the process of modification or inclusion of metal species, thus showing versatility in various applications. 24 Moreover, compared to other solids such as zeolites, it is evident that their qualities generate fewer environmental issues during the synthesis and recovery or disposal after usage.…”

Section: Introductionmentioning

confidence: 99%

Hydrocracking of crude palm oil to a biofuel using zirconium nitride and zirconium phosphide-modified bentonite

et al. 2022

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“…The successful synthesis of ZPBC and the detailed procedure carried out using the stirring-ageing technique are reported in our previous work [23]. A brief description of the procedure adopted for pillared clay preparation is as follows: about 4 mL/min of 0.2 zirconium oxychloride (500 mL) is added dropwise to an RB flask containing the stirring solution of sodium bentonite (12 g) kept at room temperature.…”

Section: Procedures Adopted For Zpbc-zirconium-pillared Bentonite Claymentioning

confidence: 99%

“…The mitigation study for phosphate removal on these urban rivers was carried out using the adsorbent ZPBC. The preparation of the adsorbent ZPBC and its characterization is reported by our group [23]. In this work, adsorption conditions for simulated phosphate solutions such as contact time with various concentrations 15, 25, 50 and 100 mg/L and with different temperatures 15, 25 and 35 °C were optimized to study various kinetic and isotherm models.…”

Section: Introductionmentioning

confidence: 99%

Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

et al. 2020

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In this work, the water quality status of the surface water that lies around the Karamana River basin, Trivandrum urban area, was studied on the basis of the water quality index (WQI) method. The eutrophic condition of the basin is revealed, and proper mitigation strategy was adopted for the removal of phosphate species using pillared clay materials. Proper sampling was carried out in the urban rivers, and various physico-chemical parameters for evaluating the quality of water were analysed. WQI values obtained for these riverine systems are in the range 317.7-3005.1, indicating that the water is not suitable without treatment for any domestic activities. Also, phosphate ions in the range 1.98-20.52 mg/L reflect the dominance of phosphate species in surface water. A proper mitigation strategy was adopted for the selective removal of phosphate ions using adsorption technique by using zirconium-pillared bentonite clay (ZPBC) prepared by the stirring-ageing technique. The batch adsorption experiment performed on simulated phosphate solution shows that for 2.0 g/L of ZPBC a maximum phosphate adsorption capacity of 35.71 mg/g was achieved in 30 min at pH 3.0. The data obtained were used to study models in kinetics and isotherm. The reusability of spent ZPBC for five continuous cycles without major loss in adsorption capacity using 0.025 M Na 2 CO 3 extractant was proved from the desorption study. A single-stage reactor was also designed from the isotherm data and proved to be effective. The applicability of the adsorbent towards phosphate anions was successfully checked in the laboratory using surface water collected and found that the complete removal of phosphate was achieved using 6.0, 8.0 and 10.0 g/L of ZPBC.Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s4245 2-020-2571-0) contains supplementary material, which is available to authorized users.

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Stirring-ageing technique to develop zirconium-pillared bentonite clay along with its surface profiling using various spectroscopic techniques

Cited by 9 publications

References 55 publications

Comparative Study of the Physico-Chemical Properties of Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminium (III) Polyhydroxocations

Comparative Study of the Physico-Chemical Properties of Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminium (III) Polyhydroxocations

Hydrocracking of crude palm oil to a biofuel using zirconium nitride and zirconium phosphide-modified bentonite

Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

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