Removal of Methylene Blue on Thermally Treated Natural Zeolites

Șenilă, Lăcrimioara; Neag, Emilia; Cadar, Oana; Becze, Anca; Scurtu, Daniela Alexandra; Tomoiag, Calin Horea; Șenilă, Marin

doi:10.1080/00032719.2021.1922431

Cited by 4 publications

(4 citation statements)

References 38 publications

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“…The chemical composition showed that SiO 2 and Al 2 O 3 are the predominant oxides. Small quantities of K 2 O, CaO, Fe 2 O 3 , Na 2 O and MgO were found [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

The Potential Application of Natural Clinoptilolite-Rich Zeolite as Support for Bacterial Community Formation for Wastewater Treatment

et al. 2022

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The aim of this study was to investigate the use of natural zeolite as support for microbial community formation during wastewater treatment. Scanning electron microscopy (SEM), thermal decomposition and differential thermogravimetric curves (TGA/DGT) techniques were used for the physicochemical and structural characterization of zeolites. The chemical characterization of wastewater was performed before and after treatment, after 30 days of using stationary zeolite as support. The chemical composition of wastewater was evaluated in terms of the products of nitrification/denitrification processes. The greatest ammonium (NH4+) adsorption was obtained for wastewater contaminated with different concentrations of ammonium, nitrate and nitrite. The wastewater quality index (WWQI) was determined to assess the effluent quality and the efficiency of the treatment plant used, showing a maximum of 71% quality improvement, thus suggesting that the treated wastewater could be discharged into aquatic environments. After 30 days, NH4+ demonstrated a high removal efficiency (higher than 98%), while NO3+ and NO2+ had a removal efficiency of 70% and 54%, respectively. The removal efficiency for metals was observed as follows (%): Mn > Cd > Cr > Zn > Fe > Ni > Co > Cu > Ba > Pb > Sr. Analysis of the microbial diversity in the zeolite samples indicated that the bacteria are formed due to the existence of nutrients in wastewater which favor their formation. In addition, the zeolite was characterized by SEM and the results indicated that the zeolite acts as an adsorbent for the pollutants and, moreover, as a support material for microbial community formation under optimal conditions. Comparing the two studied zeolites, NZ1 (particle size 1–3 mm) was found to be more suitable for wastewater treatment. Overall, the natural zeolite demonstrated high potential for pollutant removal and biomass support for bacteria community growth in wastewater treatment.

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“…The chemical composition showed that SiO 2 and Al 2 O 3 are the predominant oxides. Small quantities of K 2 O, CaO, Fe 2 O 3 , Na 2 O and MgO were found [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

The Potential Application of Natural Clinoptilolite-Rich Zeolite as Support for Bacterial Community Formation for Wastewater Treatment

et al. 2022

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“…Thus, the acid, alkaline and salt treatments of natural zeolites enhance the structural properties, i.e. surface area, pore size and microporosity, while the modification with metallic reagents and cationic surfactants adjust the zeolite’ surface in order to enhance the affinity towards different anionic contaminants [ 10 , 33 , 104 , 106 , 107 ].…”

Section: Methodologies Applied To Natural Zeolites To Improve Their P...mentioning

confidence: 99%

“…[ [3] , [4] , [5] , [6] , [7] , [8] , [9] ] and organic pollutants (pesticides, dyes, total petroleum hydrocarbons, etc.) [ [10] , [11] , [12] , [13] , [14] ]. Due to their structure and chemical composition, in their unmodified form, natural zeolites display an affinity mainly for cations, especially for monovalent cations, thus their applications are related to cationic pollutants [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Modification of natural zeolites and their applications for heavy metal removal from polluted environments: Challenges, recent advances, and perspectives

Senila,

Cadar

2024

Heliyon

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“…Due to its unique properties, natural zeolites were used in many applications such as soil and water treatment, catalysis, cosmetics, medicine, agronomy, or for gas purification [ 18 , 19 , 20 , 21 , 22 ]. The use of zeolite clinoptilolite as NH 3 gas removal for prevention of its release from the animal husbandry industry is of great interest.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Volcanic Tuff from Macicasu (Romania) and Its Capacity to Remove Ammonia from Contaminated Air

et al. 2022

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In the present work, the capability of the volcanic tuff from Macicasu (Romania) to remove ammonia (NH3) from air with different contamination levels during 24 h of adsorption experiments was investigated. The natural zeolitic volcanic tuff was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), the Brunauer–Emmett–Teller (BET) method, inductively coupled plasma optical emission spectrometry (ICP-OES), and thermogravimetric analysis (TGA). The adsorption capacities varied between 0.022 mg NH3 g−1 zeolite and 0.282 mg NH3 g−1 zeolite, depending on the NH3 concentrations in the air and at the contact time. The nonlinear forms of the Langmuir and Freundlich isotherm models were used to fit the experimental data. Additionally, the adsorption of NH3 was studied using nonlinear pseudo-first-order (PFO), pseudo-second-order (PSO), and Elovich kinetic model. Based on the total volume of pores of used volcanic tuff, the NH3 was removed from the air both due to the physical adsorption of NH3 gas and the ion exchange of NH4+ (resulted from a reaction between NH3 and H2O adsorbed by the zeolite). Depending on the initial NH3 concentration and the amount of volcanic tuff, the NH3 concentrations can be reduced below the threshold of this contaminant in the air. The adsorption capacity of NH3 per unit of zeolite (1 g) varied in the range of 0.022–0.282 mg NH3 g−1 depending on the NH3 concentration in the air.

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Removal of Methylene Blue on Thermally Treated Natural Zeolites

Cited by 4 publications

References 38 publications

The Potential Application of Natural Clinoptilolite-Rich Zeolite as Support for Bacterial Community Formation for Wastewater Treatment

The Potential Application of Natural Clinoptilolite-Rich Zeolite as Support for Bacterial Community Formation for Wastewater Treatment

Modification of natural zeolites and their applications for heavy metal removal from polluted environments: Challenges, recent advances, and perspectives

Characteristics of Volcanic Tuff from Macicasu (Romania) and Its Capacity to Remove Ammonia from Contaminated Air

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