Hierarchical 13X zeolite/reduced graphene oxide porous material for trace Pb (II) capturing from drinking water

Shi, Yanzhao; Ren, Xueying; Zheng, Hong; Zuo, Qi

doi:10.1016/j.micromeso.2021.111540

Cited by 22 publications

(6 citation statements)

References 62 publications

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“…To investigate the adsorption capacity meeting drinking water standard of PDA/H-ACF, repeated adsorption experiments were performed, and the results are shown in Figure b. It can be seen that the effluent lead concentration still met the WHO standard after being repeated 14 times, the removal rate was still above 93.5%, and the adsorption capacity meeting the standard reached 20.34 mg/g after the 14 experiments, which was far higher than those of previous reported adsorption materials , and above the single maximum adsorption capacity of 4.46 mg/g, indicating that the PDA/H-ACF was especially suitable for the removal of trace lead. The adsorption performance was also compared with other adsorbents, and the results are shown in Table S8, indicating the as-prepared material had superior adsorption performance.…”

Section: Resultsmentioning

confidence: 89%

Functionalized Activated Carbon Fibers by Hydrogen Peroxide and Polydopamine for Efficient Trace Lead Removal from Drinking Water

et al. 2021

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To achieve efficient and selective trace heavy metals removal from drinking water, a low-cost purification material polydopamine/activated carbon fibers (PDA/H-ACF) was successfully prepared by polymerizing dopamine on the surface of activated carbon fibers pretreated with hydrogen peroxide. The morphology, phase, surface functional groups, specific surface, and pore size distribution of the as-prepared sample were analyzed using FESEM, XPS, BET and pore size distribution test (PST), and FTIR, and orthogonal experiments were used to investigate the influences of concentration of H 2 O 2 , pretreatment time, and reflux temperature on trace lead removal. The results showed that the sample pretreated under optimized conditions could produce different pore structures, and the content of functional group −COOH obviously increased. After further modification by polydopamine, the contents of −NH−, −NH 2 , and −OH functional groups on the surface obviously enhanced, which were beneficial to increase adsorption site and promote trace lead removal. The effluent lead concentration decreased from initial 150 to 3.18 ppb within 5 min, meeting the requirement of NSF International Standard/American National Standard for Drinking Water Treatment Units (NSF/ANSI 53−2020) (5 ppb). The isothermal adsorption process and adsorption kinetics could be well-fitted by the Langmuir isotherm and pseudo-second-order kinetics model, indicating that the adsorption process of trace lead by PDA/H-ACF belonged to monolayer and chemical adsorption. Moreover, the as-prepared PDA/H-ACF also showed superior trace lead adsorption performance in the presence of high concentration competitive metal ions, in a wide pH range and in tap water, and therefore had good application prospect in the field of drinking water purification.

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Section: Resultsmentioning

confidence: 89%

Functionalized Activated Carbon Fibers by Hydrogen Peroxide and Polydopamine for Efficient Trace Lead Removal from Drinking Water

et al. 2021

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“…In drinking water, US EPA has set the maximum contaminant level for Hg, Cd and Cu at 0.03 µg/L [ 13 ], 5.0 µg/L [ 14 ], and 1.3 mg/L [ 15 ], respectively. The maximum Pb content in drinking water is set at <10 ppb by WHO [ 16 ]. Hence, it is important to remove Hg, Cu, Pb, Cd, and Zn from wastewater before its release into any body of water.…”

Section: Introductionmentioning

confidence: 99%

Modification Strategies of Kapok Fiber Composites and Its Application in the Adsorption of Heavy Metal Ions and Dyes from Aqueous Solutions: A Systematic Review

Futalan

Choi

Soriano

et al. 2022

IJERPH

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Kapok fiber (Ceiba pentandra) belongs to a group of natural fibers that are mainly composed of cellulose, lignin, pectin, and small traces of inorganic compounds. These fibers are lightweight with hollow tubular structure that is easy to process and abundant in nature. Currently, kapok fibers are used in industry as filling material for beddings, upholstery, soft toys, and nonwoven materials. However, kapok fiber has also a potential application in the adsorptive removal of heavy metal ions and dyes from aqueous systems. This study aims to provide a comprehensive review about the recent developments on kapok fiber composites including its chemical properties, wettability, and surface morphology. Effective and innovative kapok fiber composites are analyzed with the help of characterization tools such as scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, and Brunauer-Emmett-Teller analysis. Different pre-treatment methods such as alkali and acid pre-treatment, oxidation pre-treatment, and Fenton reaction are discussed. These techniques are applied to enhance the hydrophilicity and to generate rougher fiber surfaces. Moreover, surface modification and synthesis of kapok fiber-based composites and its environmental applications are examined. There are various methods in the fabrication of kapok fiber composites that include chemical modification and polymerization. These procedures allow the kapok fiber composites to have higher adsorption capacities for selective heavy metal and dye removal.

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“…Shi et al. reported hierarchical 13X zeolite/reduced graphene oxide porous material for removal of Pb 2+ in trace concentrations from drinking water [ 18 ]. Although GO/polystyrene composites were previously studied as sorbents of radionuclides by our group [ 19 ], no report so far was found for radionuclide sorption on zeolite/GO.…”

Section: Introductionmentioning

confidence: 99%

Carbon and zeolite-based composites for radionuclide and heavy metal sorption

Smržová¹,

Szatmáry²,

Ecorchard³

et al. 2022

Heliyon

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Hierarchical 13X zeolite/reduced graphene oxide porous material for trace Pb (II) capturing from drinking water

Cited by 22 publications

References 62 publications

Functionalized Activated Carbon Fibers by Hydrogen Peroxide and Polydopamine for Efficient Trace Lead Removal from Drinking Water

Functionalized Activated Carbon Fibers by Hydrogen Peroxide and Polydopamine for Efficient Trace Lead Removal from Drinking Water

Modification Strategies of Kapok Fiber Composites and Its Application in the Adsorption of Heavy Metal Ions and Dyes from Aqueous Solutions: A Systematic Review

Carbon and zeolite-based composites for radionuclide and heavy metal sorption

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