Saturated activated carbon regeneration by UV-light, H2O2 and Fenton reaction

Santos, Danilo H.S.; Duarte, José L. S.; Tonholo, Josealdo; Meili, Lucas; Zanta, Carmem Lúcia de Paiva e Silva

doi:10.1016/j.seppur.2020.117112

Cited by 53 publications

(18 citation statements)

References 55 publications

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“…There are no diffraction peaks ascribing to other boehmite phases indicating a high purity of the prepared sample. The diffractogram of commercial activated carbon exhibit diffraction peaks corresponds to carbon (JCPDS 00-054-0501) [26][27][28]. Figure 2 shows the TEM images of boehmite and commercial activated carbon.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Boehmite nanopowder recovered from aluminum cans waste as a potential adsorbent for the treatment of oilfield produced water

et al. 2021

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In the present study, high surface area boehmite nanopowder was recovered from aluminum cans waste. The sodium aluminate solution was first prepared by dissolving aluminum cans in NaOH solution and then, H2O2 solution was added to precipitate boehmite. The prepared boehmite was characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 adsorption–desorption techniques. The thermal stability of the boehmite sample was investigated using thermogravimetry (TG) and differential scanning calorimetry (DSC) techniques. The feasibility of using the prepared boehmite powder as a new low-cost adsorbent for the treatment of oilfield produced water was investigated. For comparison, commercial activated carbon was used for the treatment of the produced water under the same conditions. The efficiency of both of boehmite and activated carbon in the treatment of produced water was determined by monitoring the values of a number of pollution indicators [i.e. turbidity, sulfides, sulfates, total organic carbon (TOC), total petroleum hydrocarbon (TPH), and chemical oxygen demand (COD)] before and after the treatment. The boehmite powder showed very good efficiency in the treatment of the produced water, which is very close to that of commercial activated carbon under the same conditions. The effect of adsorbent dose, treatment time, and pH of the media on the adsorption efficiency of both of boehmite and activated carbon was examined at room temperature using chemical oxygen demand as a pollution indicator. The maximum capacity for COD reduction was 69.6% for boehmite and 83.5% for activated carbon at 40 g/l adsorbent dosage, pH7, and 24-h contact time. Graphic abstract

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Section: Catalyst Characterizationmentioning

confidence: 99%

Boehmite nanopowder recovered from aluminum cans waste as a potential adsorbent for the treatment of oilfield produced water

et al. 2021

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“…Santos and collaborators [ 70 ] studied the regeneration of AC used in methylene blue adsorption was evaluated through the processes of photolysis, oxidation with H 2 O 2 and Fenton reaction. The efficiency of these processes was evaluated by the recovery of the adsorption capacity of AC, measured by the amount of MB adsorbed in the successive adsorption/oxidation cycles and by the physical properties of the material obtained through SEM analysis, X-Ray Diffraction (XRD), Energy Scattering X-Ray Spectroscopy (EDS) and Fourier Transform Infrared Spectroscopy (FTIR) before and after the regeneration process.…”

Section: Adsorbent Regeneration Via Aopsmentioning

confidence: 99%

“…As for the tests in which the Fenton reaction was used, a maximum of 71% of regeneration was observed, the efficiency of this process was attributed to a synergistic AC-Fe effect. The stability of the material through adsorption-regeneration cycles and the characterization results of the AC showed that, in general, the Fenton reaction provided greater stability to the material, causing the adsorption capacity to be recovered for 7 consecutive cycles [ 70 ].…”

Section: Adsorbent Regeneration Via Aopsmentioning

confidence: 99%

“…In the course of the adsorption process, the performance efficiency of AC progressively diminishes, and requires replenishment or treatment after exhaustion [ 70 , 79 , 80 ]. Replenishment is expensive, and the economic viability of the adsorption process is determined by the reusability of spent AC [ 51 , 81 , 82 ].…”

Section: Application Of Aops For Dye-activated Saturated Carbon Regen...mentioning

confidence: 99%

“…When organic pollutants are subjected to heat, there is a possibility of forming toxic by-products that can be emitted into the environment [ 70 , 80 ]. Besides, thermal regeneration cycles are long, and causes a deterioration in the microporous structure of AC, consequently reducing the adsorption efficiency in subsequent adsorption runs [ 23 , 79 , 87 , 88 ].…”

Section: Application Of Aops For Dye-activated Saturated Carbon Regen...mentioning

confidence: 99%

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Transformation of Mytella falcata residual shell into CaAl/LDH adsorbent: Removal of methyl orange and methylene blue dyes

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This study analyzed the viability of using malacoculture residue (Mytella falcata) to produce layered double hydroxides (LDHs) and for its subsequent use as an adsorbent. The CaAl/LDH‐RE material was produced with calcium oxide from the residue and the CaAl/LDH‐AP was produced with a commercial reagent. Both were used to remove methyl orange (MO) and methylene blue (MB) dyes. The CaAl/LDH‐RE presented a surface area of 28.54 m2 g−1, being 65.62% larger than the CaAl/LDH‐AP material (17.23 m2 g−1). The adsorbents showed mesopores distributed on a surface formed by plates in the form of hexagonal sheets arranged in an overlapping manner. The dosage of 0.05 g L−1 obtained the removal of 95% and 97% for MO, while for MB it was 94% and 93% using the adsorbents LDH/CaAl‐AP and LDH/CaAl‐RE, respectively. The system reached equilibrium at 90 min for MO and 120 min for MB. The pseudo‐second order model well represented the kinetic data reaching 11.36 mg g−1 (CaAl/LDH‐RE) and 8.42 mg g−1 (CaAl/LDH‐AP) for MO, and 4.47 mg g−1 (CaAl/LDH‐RE) and 4.14 mg g−1 (CaAl/LDH‐AP) for MB. The Freundlich model better represented the isothermal data, where the temperature exerted little influence. Adsorbents showed similar removal percentages in real and synthetic matrices. The LDH/CaAl‐RE can be applied in up to 3 cycles, maintaining its adsorption capacity. These results corroborate the use of MFW to produce CaAl/LDH‐RE, which can be used for the efficient removal of organic pollutants in an aqueous solution.

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Saturated activated carbon regeneration by UV-light, H2O2 and Fenton reaction

Cited by 53 publications

References 55 publications

Boehmite nanopowder recovered from aluminum cans waste as a potential adsorbent for the treatment of oilfield produced water

Boehmite nanopowder recovered from aluminum cans waste as a potential adsorbent for the treatment of oilfield produced water

Regeneration of dye-saturated activated carbon through advanced oxidative processes: A review

Transformation of Mytella falcata residual shell into CaAl/LDH adsorbent: Removal of methyl orange and methylene blue dyes

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