Extensive and selective adsorption of ZIF-67 towards organic dyes: Performance and mechanism

Du, Xuedong; Wang, Chong-Chen; Liu, Jianguo; Zhao, Xudong; Zhong, Jun; Li, Yuxuan; Li, Jin; Wang, Peng

doi:10.1016/j.jcis.2017.07.073

Cited by 216 publications

(71 citation statements)

References 48 publications

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“…The main mechanisms for MB removal by adsorbent or biochar involve physical interaction, ion exchange, electrostatic interaction, π-π stacking, hydrogen bonding and pore filling [48,[57][58][59][60][61][62][63][64][65]. The dominant mechanisms depend on the physicochemical properties of biochar and specific environmental conditions in the solution.…”

Section: Removal Mechanism Of Methylene Blue By Biocharmentioning

confidence: 99%

Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution

Liu

Fan

2019

Processes

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Improperly treated or directly discharged into the environment, wastewater containing dyes can destroy the quality of water bodies and pollute the ecological environment. The removal of dye wastewater is urgent and essential. In this study, corn stalk was pyrolyzed to pristine biochar (CSBC) in a limited oxygen atmosphere and modified using KOH and H 3 PO 4 (KOH-CSBC, H 3 PO 4 -CSBC, respectively). The biochars were characterized by surface area and pore size, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), as well as their behavior in adsorbing methylene blue (MB). Results indicated that the pore structure of CSBC became more developed after modification by KOH. Meanwhile, H 3 PO 4 -CSBC contained more functional groups after activation treatment. The pseudo-second-order kinetic and the Langmuir adsorption isotherm represented the adsorption process well. The maximum MB adsorption capacity of CSBC, KOH-CSBC, and H 3 PO 4 -CSBC was 43.14 mg g −1 , 406.43 mg g −1 and 230.39 mg g −1 , respectively. Chemical modification significantly enhanced the adsorption of MB onto biochar, especially for KOH-CSBC. The adsorption mechanism between MB and biochar involved physical interaction, electrostatic interaction, hydrogen bonding and π-π interaction. Hence, modified CSBC (especially KOH-CSBC) has the potential for use as an adsorbent to remove dye from textile wastewater.

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Section: Removal Mechanism Of Methylene Blue By Biocharmentioning

confidence: 99%

Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution

Liu

Fan

2019

Processes

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“…First, since AO7 contains a sulfonate group, the dye exists in solution as negatively charged anions. Secondly, since the isoelectric point of the ZIF-67 is at pH of 9, it indicates that the MOF surface is positively charged when pH < 9 but negatively charged when pH > 9 [51]. The isoelectric point of ZIF-8 is at pH of 8, so the MOF surface is positively charged when pH < 7 but negatively charged when pH > 7 [52].…”

Section: Adsorption Of Ao7 By Mofsmentioning

confidence: 99%

Removal of Acid Orange 7 from Aqueous Solution by Metal-Organic Frameworks

Yoon

Calvo

2018

Crystals

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We investigated the removal of a harmful anionic dye, acid orange 7 (AO7), from aqueous solution using metal-organic frameworks (MOFs). We prepared four different MOFs (ZIF-8, ZIF-67, UiO-66, UiO-66-NH2) by solvothermal reactions and then tested their adsorption of AO7. Infrared spectra and adsorption capacity data confirmed the removal of AO7 from aqueous solution. The factors we investigated affecting adsorption capacity include variation of the organic linkers and metal clusters of the MOFs. Our results suggest that the hydrogen bonding, π–π interactions, and zeta potentials facilitate the removal of AO7 from water. Of the four MOFs examined, ZIF-67 exhibited the highest adsorption capacity of AO7 and can be regenerated easily.

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“…Due to characteristic structure, imidazole ring in the compound could be regarded as an aromatic ring. The compound containing imidazole ring can interact with other aromatic compound through π‐π stacking interaction (Andrew Lin & Chang, ; Du et al, ; Zhang, Zhang, Liu, Xiong, & Chen, ). This might be the main factor for the occurrence of DB80 adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…There are many reports that ZIFs were used as adsorbents to remove organic/inorganic contaminant from wastewater, and they showed a great potential application in wastewater treatment. In particular, ZIF‐67 exhibited excellent adsorption capability for the removal of several hazardous pollutants including Cr(VI) (Li, Gao, Ai, & Jiang, ), benzotriazole (Andrew Lin & Lee, ; Wang et al, ), methyl orange (Du et al, ; Yang et al, ), malachite green (Andrew Lin & Chang, ), phenol (Pan et al, ), and 1‐naphthol (Yan, Hu, Chen, Zhang, & Zhou, ). These studies suggested that hydrophobic pore and surface structure and the affinity of cobalt cation in ZIF‐67 were responsible for the excellent adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Fe₃O₄/ZIF‐67 composite for removal of direct blue 80 from water

Gao

Cui

et al. 2019

Water Environment Research

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Fe 3 O 4 /ZIF-67 composite was successfully fabricated by a facile method and used as adsorbent to remove direct blue 80 (DB80, azo dye) from water. Characterizations of Fe 3 O 4 /ZIF-67 composite were performed by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy (FTIR), and magnetic property analysis. As an adsorbent, the factors (such as adsorbent dose, pH, initial concentration, contact time, and temperature) affecting the adsorption performance of adsorbent were investigated. The optimal adsorption condition is 5 mg of Fe 3 O 4 /ZIF-67 composite in 8 ml of DB80 solution (70 mg/L) for 60 min at 318 K, and the pH value has little effect on the adsorption performance. The adsorption isotherm, kinetics, and thermodynamics of DB80 adsorbed on the Fe 3 O 4 /ZIF-67 composite were also studied. The experimental results revealed that the experimental data followed the Langmuir model and the adsorption behavior could be well explained by pseudosecond-order kinetic model. Thermodynamic analysis indicated that the adsorption was a spontaneous and endothermic process. Furthermore, the mechanism of DB80 adsorbed on the Fe 3 O 4 /ZIF-67 composite was proposed. The occurrence of adsorption might be caused by the π-π stacking interaction between Fe 3 O 4 /ZIF-67 composite and DB80.

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Extensive and selective adsorption of ZIF-67 towards organic dyes: Performance and mechanism

Cited by 216 publications

References 48 publications

Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution

Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution

Removal of Acid Orange 7 from Aqueous Solution by Metal-Organic Frameworks

Fabrication of Fe₃O₄/ZIF‐67 composite for removal of direct blue 80 from water

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Extensive and selective adsorption of ZIF-67 towards organic dyes: Performance and mechanism

Cited by 216 publications

References 48 publications

Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution

Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution

Removal of Acid Orange 7 from Aqueous Solution by Metal-Organic Frameworks

Fabrication of Fe3O4/ZIF‐67 composite for removal of direct blue 80 from water

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Product

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Fabrication of Fe₃O₄/ZIF‐67 composite for removal of direct blue 80 from water