Research progress of modified natural zeolites for removal of typical anions in water

Lü, Wenjing; Zhang, Chunhui; Su, Peidong; Wang, Xinling; Shen, Wenlong; Quan, Bingxu; Shen, Zhelin; Song, Lei

doi:10.1039/d2ew00478j

Cited by 5 publications

(4 citation statements)

References 120 publications

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“…Carboxyl is electrically liberated to form •C 7 F 15 (Equation ( 11)). It then reacts with SO 4 2− to form C 7 F 15 OSO 3 − (Equation ( 12)); and then form C 7 F 15 OH (Equation ( 13)) [61,62]. The C 6 F 13 COOH is generated by sequential removal of the HF (Equations ( 14) and ( 15)).…”

Section: Degradation Mechanism In Persulfate Systemsmentioning

confidence: 99%

Research Updates on the Mechanism and Influencing Factors of the Photocatalytic Degradation of Perfluorooctanoic Acid (PFOA) in Water Environments

Liang

Guo²,

Xiang

et al. 2023

Molecules

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Perfluorooctanoic acid is ubiquitous in water bodies and is detrimental to the health of organisms. Effectively removing perfluorooctanoic acid (PFOA), a persistent organic pollutant, has been a hot topic around the world. With traditional physical, chemical, and biological methods, it is difficult to effectively and completely remove PFOA, the costs are high, and it is easy to cause secondary pollution. There are difficulties in applying some technologies. Therefore, more efficient and green degradation technologies have been sought. Photochemical degradation has been shown to be a low-cost, efficient, and sustainable technique for PFOA removal from water. Photocatalytic degradation technology offers great potential and prospects for the efficient degradation of PFOA. Most studies on PFOA have been conducted under ideal laboratory conditions at concentrations that are higher than those detected in real wastewater. This paper summarizes the research status of the photo-oxidative degradation of PFOA, and it summarizes the mechanism and kinetics of PFOA degradation in different systems, as well as the influence of key factors on the photo-oxidative degradation and defluoridation process, such as system pH, photocatalyst concentration, etc. PFOA photodegradation technology’s existing problems and future work directions are also presented. This review provides a useful reference for future research on PFOA pollution control technology.

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Section: Degradation Mechanism In Persulfate Systemsmentioning

confidence: 99%

Research Updates on the Mechanism and Influencing Factors of the Photocatalytic Degradation of Perfluorooctanoic Acid (PFOA) in Water Environments

Liang

Guo²,

Xiang

et al. 2023

Molecules

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“…However, because the presence of impurities in natural zeolite gives rise to several challenges, including blockages, limited pore connectivity, and a negatively charged surface. These factors are all detrimental to the effective adsorption of anions (Lu et al, 2022). The modi cations of zeolite are usually required in order to promote properties of zeolite in catalysis and adsorption (Sun et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of fluorine from lepidolite hydrometallurgy wastewater by aluminum modified zeolite

Gong,

Zhou,

et al. 2024

Preprint

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Fluoride contamination is a serious environmental problem in lepidolite hydrometallurgy wastewater. The treatment of the fluoride-bearing wastewater is facing a great challenge due to the presence of co-existed ions including lithium (Li+), rubidium (Rb+), silicate (SiO32−), sulfate radical (SO42−) and so on. However, aluminum-modified zeolite (Al@zeolite) of sufficient hydroxyl group and high adaptability have exhibited unique advantages for fluoride elimination from lepidolite hydrometallurgy wastewater. Al@zeolite was prepared on natural zeolite by an atmospheric process, and it was then used for the adsorption of fluorine from fluoride bearing wastewater produced by lepidolite hydrometallurgy process. The results of material characterization confirmed the successful immobilization of aluminum within the zeolite pores, and indicating the formation of zeolite-Al-OH. The zeolite host significantly enhanced the chemical stability of Al@zeolite against pH changes with a wide pH of 2.0–10.0. The adsorbent possessed a surface area of 33.46 m2/g and demonstrated excellent capacity and selectivity for fluoride adsorption. It is pertinent to mention that maximum adsorption of 98.6% has been observed with a pH value of 6.0 with 20 min time duration with fluoride dosage of 20 mg/L, and the equilibrium concentration dwindled to 0.4 mg/L. The results of fluorine adsorption showed that fluoride uptake onto Al@zeolite agreed well with the pseudo-first-order kinetic model and the Langmuir isotherm model. The reusability of the substance was evaluated for up to eight cycles following consecutive regeneration with 0.2 mol/L AlCl3. The exhausted Al@zeolite was effectively regenerated through a simple alkaline treatment for recycling. The above results verified that Al@zeolite is a new kind of efficient defluoridation adsorbent for lepidolite hydrometallurgy wastewater with practical application prospect.

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“…In recent years, natural clay adsorbents have received more and more attention and research in wastewater treatment. With excellent adsorption results, clay minerals prepared using a variety of modification techniques have been used successfully for wastewater treatment [33][34][35][36][37]. Li et al [38] modified talc by microwave-assisted acidification.…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue from Aqueous Solutions by Surface Modified Talc

et al. 2023

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In this study, raw talc powder surface modification was conducted, and the powder was modified in two different methods using acid washing and ball milling. Modified talc was characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). In order to investigate the adsorption capacity of modified talc on dyes, adsorption experiments were carried out with methylene blue (MB) in aqueous solutions as the target contaminant. The findings of the characterization revealed that both modifications increased the adsorption capacity of talc, which was attributed to changes in specific surface area and active groups. The influence of process parameters such as contact time, pH, dye concentration, and adsorbent dosage on the adsorption performance was systematically investigated. Modified talc was able to adsorb MB rapidly, reaching equilibrium within 60 min. Additionally, the adsorption performance was improved as the pH of the dye solution increased. The isotherms for MB adsorption by modified talc fitted well with the Langmuir model. The pseudo-second-order model in the adsorption kinetic model properly described the adsorption behavior. The results show that the modified talc can be used as an inexpensive and abundant candidate material for the adsorption of dyes in industrial wastewater.

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Research progress of modified natural zeolites for removal of typical anions in water

Abstract: Natural zeolite has been regarded as an adsorbent for cation removal in water. However, natural zeolite cannot effectively adsorb anions due to the negative charge. In recent years, great effort...

Cited by 5 publications

References 120 publications

Research Updates on the Mechanism and Influencing Factors of the Photocatalytic Degradation of Perfluorooctanoic Acid (PFOA) in Water Environments

Research Updates on the Mechanism and Influencing Factors of the Photocatalytic Degradation of Perfluorooctanoic Acid (PFOA) in Water Environments

Adsorption of fluorine from lepidolite hydrometallurgy wastewater by aluminum modified zeolite

Removal of Methylene Blue from Aqueous Solutions by Surface Modified Talc

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