A practical method to remove perfluorooctanoic acid from aqueous media using layer double hydride system: a prospect for environmental remediation

Ahmed, Ammara; Wang, Wenmin; Okonkwo, Chioma Joy; Liu, Na

doi:10.1080/09593330.2020.1812733

Cited by 10 publications

(3 citation statements)

References 51 publications

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“…After adsorption, pH increased possibly due to the release of OH À from hydrotalcite. At the same time, at initial pH values of 4-10, these trends were not significant, indicating that hydrotalcite exhibits a certain buffering effect on the change of the solution pH; hence, within a certain range of pH, the effect of pH on adsorption capacity of nitrate and nitrite by CHT is not extremely significant, and the adoption range is wide (Ahmed et al 2020). With the decrease in the solution pH to 2.50, the nitrate and nitrite adsorption capacities decreased to 6.41 mg N/g and 10.12 mg N/g, respectively, with the corresponding decrease in the final solution pH to 10.09 and 10.04.…”

Section: Effects Of Initial Phmentioning

confidence: 96%

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Chen

Wei

et al. 2021

Water Supply

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In this study, magnetic Mg/Fe hydrotalcite calcined material (M-CHT) was synthesized through co-precipitation and calcination method, and was used to effectively remove nitrate and nitrite from water. M-CHT can restore its original layered structure after the adsorption of nitrate or nitrite, and can be easily separated by the applied magnetic field. The first-order and pseudo-second-order kinetic models (R2 ≥ 0.97) can better describe the adsorption kinetic process. The equilibrium isotherm showed that the Langmuir model provided a better fit to the experimental data than the Freundlich model for nitrates and nitrites. With temperature increased from 298 to 308 K, the maximum adsorption capacity obtained by the Langmuir model increased from 10.60 to 16.90 mg-N/g for nitrate and 7.89 to 14.28 mg-N/g for nitrite, respectively. The adverse effect of coexisting anions ranked in the order of ClO4− > Cl− > SO42− > F− > CO32− > PO43−. The actual Fe2+/Fe3+ value of M-CHT (0.56) is nearly consistent with the theoretical value of 0.5, and the saturation magnetic strength value of M-CHT is 9.15 emu/g, greatly contributing to the solid-liquid separation. Overall, M-CHT with features of magnetic properties and satisfactory adsorption capacity exhibits the greatly promising for application in wastewater purification.

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Section: Effects Of Initial Phmentioning

confidence: 96%

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Chen

Wei

et al. 2021

Water Supply

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“…Inorganic minerals such as hydroxides, zeolites, and boron nitrides have also been successfully employed. Ahmed et al [48] tested the adsorption of PFOA via bilayered hydroxides of magnesium (Mg) and aluminum (Al). The material showed a specific surface area (BET method) between 29.1 and 37 m 2 /g.…”

Section: Metal-organic and Metal-inorganic Adsorbentsmentioning

confidence: 99%

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Collivignarelli,

Bellazzi,

Caccamo

et al. 2023

Sustainability

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Per- and polyfluoroalkyl substances (PFAS) constitute a group of organofluorine chemical synthetic compounds widely used in industries and manufacturing due to their hydrophobic properties. However, PFAS have been found to cause negative human health outcomes. Therefore, a strong interest in the possible removal of these compounds from wastewater (WW) has been shown. This work aims to present a systematic analysis of the scientific literature related to the innovative and alternative adsorbent materials that can be used for treating PFAS-contaminated WW. Moreover, the adsorption processes are considered, focusing the attention on virgin adsorbent materials and biochar as adsorbents. Virgin adsorbent materials comprise conventional adsorbent materials, functional clays, metal–organic frameworks, and functionalized organic polymers. Biochar includes materials obtained from agricultural or food residues and from sewage sludge. The review shows that conventional treatment units using virgin adsorbent materials are characterized by high adsorption capacity, but also high costs. In addition, the refunctionalization of adsorbent materials is difficult to obtain. On the contrary, biochar, which is a residual product of other production processes, appears to be a cost-effective solution.

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“…废水中阴离子类型的污染物主要分为无机阴离子型污染物 [10] 和有机阴离子型污染物 [11] . 无机阴离子污染物(主要包括重铬酸盐 [12] 、砷酸盐 [13] 、硝酸盐 [14] 、高氯酸盐 [15] 、硒酸盐 [16] 等)广泛存在于废水中, 且对人类及生态环境存在严重的危害. 例如, 硝酸盐(NO 3 − )、磷酸盐(PO 4 3− )会使水体富营养化, 人体过量摄入会引起高铁血红蛋白症 [17] ; 水体中的Cr(VI)以Cr 2 O 7 2− 阴离子的形式存在, 其难以通过富集降解, 且比处理其他污染物更困难, 人体吸入或接触皮肤会对肾脏和肝脏造成危害 [18] ; 高氯酸盐会影响人体内甲状腺吸收碘, 从而影响成人的新陈代谢和婴幼儿的正常生长 [19] ; 砷酸盐具有强生物毒性, 可致使植物营养生长不良 [20] , 进入人体会影响细胞的正常代谢 [21] .…”

Section: 阴离子污染物指水中以阴离子形式存在的离子态污染物质此类污染物是废水中一个较为重要的污染unclassified

Research progress in the treatment of anionic pollutants in wastewater

Xiu-xia¹,

Shang²,

Zhang³

et al. 2021

Sci. Sin.-Chim

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Most of the anionic pollutants in wastewater are toxic and harmful to the natural environment and human health. Anionic contamination and its treatment have emerged as an escalating challenge globally. It is imperative to develop technology and methods to achieve the effective removal of anionic pollutants. Extraordinary efforts have been made to overcome the challenges of wastewater treatment in recent years. In this paper, the treatment of anionic pollutants in wastewater are reviewed, respectively from the physical treatment, chemical treatment, physical and chemical treatment, and biological treatment. Various techniques such as physical procedures like adsorption and membrane filtration, chemical methods like reduction method and coprecipitation process, and several biological techniques have been recognized for the treatment of wastewater. Meanwhile, the effects of different methods on the treatment of anionic pollutants in wastewater were summarized, and the advantages and disadvantages of each treatment method were compared and analyzed. This review communicates insights into recent research developments in different treatment techniques and their applications to eradicate various water contaminants. Finally, the future research direction of anionic pollutants treatment technology in wastewater is prospected. This will provide methods and data support for the treatment and practical application of anionic pollutants in wastewater.

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A practical method to remove perfluorooctanoic acid from aqueous media using layer double hydride system: a prospect for environmental remediation

Cited by 10 publications

References 51 publications

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Adsorption of nitrate and nitrite from aqueous solution by magnetic Mg/Fe hydrotalcite

Removal of Per- and Polyfluoroalkyl Substances by Adsorption on Innovative Adsorbent Materials

Research progress in the treatment of anionic pollutants in wastewater

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