Towards synergistic combination of biochar/ultrasonic persulfate enhancing removal of natural humic acids from water

Liu, Hongbo; Ye, Mengting; Ren, Zhengxing; Lichtfouse, Éric; Chen, Zhongbing

doi:10.1016/j.jece.2022.107809

Cited by 19 publications

(5 citation statements)

References 63 publications

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“…This activation process involves external energy exceeding the bond energy (140~213.3 kJ/mol) [25], leading to the cleavage of the peroxide bond in PMS and the generation of SO 4 − • radicals and •OH. These radicals are potent oxidizing agents that can rapidly degrade various pollutants [26][27][28]. Therefore, the UV/PMS process is more advantageous for HA degradation compared to the use of UV or PMS alone.…”

Section: Degradation Efficiency Of Ha By Uv/pds In Aqueous Solutionsmentioning

confidence: 99%

UV/Advanced Oxidation Process for Removing Humic Acid from Natural Water: Comparison of Different Methods and Effect of External Factors

Shen,

Song,

Fan

et al. 2024

Water

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Humic acid (HA) is an organic compound naturally present in aquatic environments. It has been found to have detrimental effects on water color, the transport of heavy metals, and the elimination of disinfection by-products (DBPs), thereby exerting an impact on human health. This study introduced four synergistic ultraviolet/advanced oxidation processes (UV/AOPs) systems aimed at eliminating HA from water. The research explored the effect of solution pH, duration of illumination, initial reactant concentration, and oxidant concentration on the degradation of HA. The results indicated that the mineralization rate achieved by individual UV or oxidant systems was less than 15%, which is significantly lower compared to UV/AOPs systems. Among these methods, the UV/peroxymonosulfate (UV/PMS) process demonstrated the highest effectiveness, achieving a mineralization rate of 94.15%. UV/peroxydisulfate (UV/PDS) and UV/sodium percarbonate (SPC) were subsequently implemented, with UV/sulfite (S(IV)) demonstrating the lowest effectiveness at 19.8%. Optimal degradation efficiency was achieved when the initial concentration of HA was 10 mg/L, the concentration of PMS was 3 mmol/L, and the initial pH was set at 5, with an illumination time of 180 min. This experimental setup resulted in high degradation efficiencies for chemical oxygen demand (COD), UV254, and HA, reaching 96.32%, 97.34%, and 92.09%, respectively. The energy efficiency of this process (EE/O) was measured at 0.0149 (kWh)/m3, indicating the capability of the UV/PMS system to efficiently degrade and mineralize HA in water. This offers theoretical guidance for the engineered implementation of a UV/PAM process in the treatment of HA.

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Section: Degradation Efficiency Of Ha By Uv/pds In Aqueous Solutionsmentioning

confidence: 99%

UV/Advanced Oxidation Process for Removing Humic Acid from Natural Water: Comparison of Different Methods and Effect of External Factors

Shen,

Song,

Fan

et al. 2024

Water

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“…That investigation presented a high removal rate of humic acids (HAs). In fact, pollutant removal rates were achieved of 92.5% for the biochar/peroxydisulfate/ultrasound system, 84.0% for the biochar and persulfate process, 52.0% for sole biochar, 50.0% for combined biochar/ultrasound, 10.0% for combined persulfate/ultrasonic, 4.0% for sole ultrasonic, and 1.0% for sole persulfate systems [24]. Despite the good results, these previous works have not presented information about the effect of ultrasound frequency on the sonocarbocatalytic process, nor compared the activation of diverse peroxides (PMS, persulfate, and hydrogen peroxide) in their systems.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, hybrid processes can increase the efficiency of the catalytic process by combining ultrasound and carbocatalysis. This combination generates a new process called sonocarbocatalysis [24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the Carbocatalytic Degradation of Pharmaceuticals in Water by the Use of Ultrasound Waves

Quimbaya-Ñañez,

Serna-Galvis,

Silva-Agredo

et al. 2023

Water

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A carbonaceous material obtained from wood wastes (SW-Mn) was initially used for the removal of pharmaceuticals in water by a carbocatalytic system. The SW-Mn material adsorbed only 41% of the diclofenac (DCF) and 3% of the valsartan (VAL). Interestingly, SW-Mn activated peroxymonosulfate (PMS) and presented a significant increase in the removal rate of DCF, surpassing 90%, while VAL achieved a 24% removal rate at 20 min of treatment. The carbonaceous material was not effective in activating peroxydisulfate or hydrogen peroxide. Nevertheless, the addition of ultrasound waves at 40 kHz to the carbocatalytic system (SW-Mn +PMS) significantly enhanced VAL degradation, exhibiting a high synergy index (4.98). The routes of the degradation were determined using scavengers, and XPS and EPR analyses, evidencing the main action of singlet oxygen in both carbocatalytic and sonocarbocatalytic systems. It is important to note that radicals also participated in the sonocarbocatalytic process, albeit with a minor contribution. The reuse of SW-Mn was tested during various cycles, showing up to a 39.2% VAL degradation rate after the third consecutive reuse. Moreover, the sonocarbocatalytic system was applied to a sample of irrigation crop water spiked with VAL. The treatment induced a partial elimination of the pollutant due to some interfering effects of the matrix components.

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“…Ultrasound activation achieves homogenization of the O-O bond in persulfate through cavitation, resulting in the generation of active species such as SO 4 À and OH. 27,28 Ultrasound activation does not cause secondary pollution. However, its low efficiency is a major obstacle to its development.…”

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confidence: 99%

A review of recent studies on nano zero-valent iron activated persulfate advanced oxidation technology for the degradation of organic pollutants

Lei

Song

et al. 2023

New J. Chem.

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Towards synergistic combination of biochar/ultrasonic persulfate enhancing removal of natural humic acids from water

Cited by 19 publications

References 63 publications

UV/Advanced Oxidation Process for Removing Humic Acid from Natural Water: Comparison of Different Methods and Effect of External Factors

UV/Advanced Oxidation Process for Removing Humic Acid from Natural Water: Comparison of Different Methods and Effect of External Factors

Improvement of the Carbocatalytic Degradation of Pharmaceuticals in Water by the Use of Ultrasound Waves

A review of recent studies on nano zero-valent iron activated persulfate advanced oxidation technology for the degradation of organic pollutants

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