Chemical removal and selectivity reduction of nitrate from water by (nano) zero-valent iron/activated carbon micro-electrolysis

Song, Ningfan; Xu, Jian; Cao, Yunpeng; Xia, Fanjie; Zhai, Jun; Ai, Hainan; Shi, Dezhi; Gu, Li; He, Qiang

doi:10.1016/j.chemosphere.2020.125986

Cited by 58 publications

(20 citation statements)

References 31 publications

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“…Eljamal et al attempted to improve the performance of nZVI in removing nitrate from water by coating nZVI with polyacrylamide (PPA) and the coated nZVI (PPA-nZVI) completely removed 300 mg L -1 of nitrate within 2 h [14]. In addition, table 1 shows that the nZVI-based composites prepared by Song et al [15], Zhang et al [16], Zhang et al [17], Tang et al [18], Anbia and Kamel [19], and Babaei et al [20] succeeded to accomplish full removal of different concentrations of nitrate (20-100 mg L -1 ), whilst the nZVI-based materials proposed by Khoshro et…”

Section: Nitrate Removalmentioning

confidence: 99%

Mini Review on Recent Applications of Nanotechnology in Nutrient and Heavy Metals Removal from Contaminated Water

Falyouna¹,

Maamoun²,

Bensaida³

et al. 2021

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Several toxic substances, such as nutrients, heavy metals, radionuclides, and pharmaceuticals, are continuously discharging to the environment, as a result of unaccountable industrial and agricultural activities, and contaminating huge quantities of soil and water. Nanotechnology was employed over the past years to remediate the contaminated waters and clean the environment from these pollutants to protect the life on the planet. Nanoscale zerovalent iron (nZVI) is one of the most applied nanomaterials in the field of water and wastewater treatment and it is extensively utilized to remove a wide range of contaminants from water. Thus, this mini review intends to summarize the latest applications of nZVI and its composites in eliminating several nutrients and heavy metals, namely nitrate (NO3 -), phosphorous (P), chromium (Cr) and arsenic (As).

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Section: Nitrate Removalmentioning

confidence: 99%

Mini Review on Recent Applications of Nanotechnology in Nutrient and Heavy Metals Removal from Contaminated Water

Falyouna¹,

Maamoun²,

Bensaida³

et al. 2021

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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“…13 Some researches confirmed that ZVI and activated carbon (AC) act as anode and cathode, respectively, which accelerate the reduction reaction and the number of microscopic galvanic cells determines its performance. [29][30][31][32] The study of Hu combined ZVI and granular AC showing an excellent nitrobenzene removal efficiency (93%), much higher than pure nZVI (31%) or GAC (20%). 33 The removal efficiency of Cr(VI) is significantly enhanced by the mZVI/AC composite reaching 94.01% within 120 min under acidic and anaerobic condition.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon inhibits the formation of the passivation layer on the surface of the ZVI, thereby ensuring its high activity 13 . Some researches confirmed that ZVI and activated carbon (AC) act as anode and cathode, respectively, which accelerate the reduction reaction and the number of microscopic galvanic cells determines its performance 29–32 . The study of Hu combined ZVI and granular AC showing an excellent nitrobenzene removal efficiency (93%), much higher than pure nZVI (31%) or GAC (20%) 33 .…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) removal from groundwater by calcium alginate coating microscale zero‐valent iron and activated carbon: Batch and column tests

Duan

Meng

et al. 2022

J of Applied Polymer Sci

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Although most of the studies focus on the nanoscale zero‐valent iron (nZVI), it still ineffective when comes to in situ utilization due to its intrinsic drawbacks such as rapid aggregation, biotoxicity, high cost, complex preparation process, and so forth. With advantages of lower health risk, lower cost, and simpler fabricate method, microscale zero‐valent iron (mZVI) shows more attractiveness for groundwater remediation than nZVI if its main problem, passivation, can be alleviated. In order to overcome the passivation of mZVI, (mZVI+AC)/CA was produced by encapsulating mZVI and activated carbon (AC) in spherical calcium alginate (CA) matrix in this study. The method effectively solved the passivation of mZVI and showed great long‐effective removal of Cr(VI). The Cr(VI) removal efficiency of (mZVI+AC)/CA could maintain 1.6–2.69 times as much as that of pure mZVI for 0–1500 pore volumes. The maximum Cr(VI) removal capacity reached 100.47 mg/g, which exceeded most of mZVI‐based materials and even some nZVI‐based materials. In addition, mechanism of Cr(VI) removal was revealed by X‐ray diffraction and X‐ray photo‐electron spectroscopy. The results showed that chemisorption, physisorption, reduction, oxidation, and precipitation were involved in the process. Pseudo‐second order model and Freundlich isotherm model were best fitted in kinetics and isotherm experiments, respectively.

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“…Moreover, this process does not need external electrical energy or chemical coagulants [7]. Now, much attention is being paid to degrade organic pollutants in wastewater using a Fe/C ME system [9][10][11]. Nonetheless, due to the corrosion products on the metal surface and large amounts of hydroxide precipitation, the reactivity of Fe is apt to decrease over time [12].…”

Section: Introductionmentioning

confidence: 99%

Pretreatment of Rubber Additives Processing Wastewater by Aluminum–Carbon Micro-Electrolysis Process: Process Optimization and Mechanism Analysis

Zhu

Huang

2022

Water

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The pretreatment of rubber additives processing wastewater was performed by Al/AC micro-electrolysis (ME). The single-factor experiments for the removal of COD and chroma were investigated. The Box-Behnken Design (BBD) was also applied to optimize the experimental conditions, and the fitted response surface model supplied highly significant quadratic models for the process. The COD removal efficiency reached 51.6% at an initial pH of 9.8, Al scrap dosage of 98.6 g L−1, Al/AC mass ratio of 0.26, and reaction time of 176 min, which was reasonably consistent with the predicated value of 51.9%. Moreover, we proposed a reaction mechanism of the process for the degradation of organic contaminants, and found that the removal of COD and chroma were mainly ascribed to the combination of active hydrogen [H] with strong chemical reactivity and flocculation of aluminum hydroxide. All these results showed that Al/AC ME is a promising pretreatment technique for this wastewater.

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Chemical removal and selectivity reduction of nitrate from water by (nano) zero-valent iron/activated carbon micro-electrolysis

Cited by 58 publications

References 31 publications

Mini Review on Recent Applications of Nanotechnology in Nutrient and Heavy Metals Removal from Contaminated Water

Mini Review on Recent Applications of Nanotechnology in Nutrient and Heavy Metals Removal from Contaminated Water

Cr(VI) removal from groundwater by calcium alginate coating microscale zero‐valent iron and activated carbon: Batch and column tests

Pretreatment of Rubber Additives Processing Wastewater by Aluminum–Carbon Micro-Electrolysis Process: Process Optimization and Mechanism Analysis

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