Insight into the efficient co-removal of Cr(VI) and Cr(III) by positively charged UiO-66-NH2 decorated ultrafiltration membrane

Zhang, Yanhong; Xu, Xiaoming; Yue, Chao; Song, Li; Lv, Yingzhi; Liu, Fuqiang; Li, Aimin

doi:10.1016/j.cej.2020.126546

Cited by 89 publications

(15 citation statements)

References 44 publications

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“…In a study developed by Vinodhini et al [39], UF acetate cellulose and nanochitosan membranes showed Cr rejections varying between 78.5% (initial rejection) and 30.33% (rejection after 90 min of operation) when using feed solutions with 200 ppm of Cr(VI) at pH 5, which were explained by the adsorption of Cr to the amine groups of chitosan. Efficient Cr(VI) and Cr(III) rejections were also reported by Zhang et al [40] using ultrafiltration membranes decorated with positively charged UiO-66-NH 2 compounds, from feed solutions containing 10.4 mg/L of these ions. The removal of Cr(VI) was explained by the electrostatic attraction to the positive charges in the membrane, whereas concentrations of Cr(III) lower than 1.5 mg/L in the effluent (stable during the operation time) were obtained with MOF@PVDF-0.02 and PEI/MOF@PVDF-0.02 membranes.…”

Section: Diafiltration Of the Sw30 Concentrate Solution-synthetic Tannery Effluentsupporting

confidence: 61%

Recovery of Cr(III) from Tannery Effluents by Diafiltration Using Chitosan Modified Membranes

Zakmout

Sadi

Велизаров

et al. 2021

Water

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The selective recovery of chromium remaining in tannery effluents after the leather tanning process is highly desirable to potentiate its reuse, simultaneously minimizing the ecotoxicity of these effluents. To the best of our knowledge, this work evaluates for the first time the ability of a chitosan-based membrane for selective recovery of chromium from a tannery wastewater by subsequent diafiltration and selective chromium desorption, envisaging their integration after tannery wastewater treatment by reverse osmosis (RO). A polyethersulfone (PES) microfiltration membrane top-coated with a chitosan layer (cs-PES MF022) was used for selective recovery of Cr(III), from concentrate streams obtained by treatment of synthetic and real tannery effluents through reverse osmosis (RO), through a diafiltration process. The diafiltration of the RO concentrates was conducted by an intermittent addition of water acidified to pH 3.6. The prepared cs-PES MF022 membranes were able to retain 97% of the total mass of Cr(III) present in the RO concentrates, from a real tannery effluent, with a selectivity of 4.2 and 5 in reference to NH4+ and Cl−, respectively, 12.9 and 14.6 in reference to K and Na, and > 45 in reference to Mg, Ca, and S. Such a high selectivity is explained by the preferential adsorption of Cr(III) onto chitosan, and by the relatively high permeability of cs-PES MF022 membranes to the other ionic species. Proof of concept studies were performed to investigate the desorption of Cr(III) at pH 2 and 5.8. A higher Cr(III) desorption degree was obtained at pH 2, leading to a final solution enriched in Cr(III), which may be re-used in tannery operations, thus improving the process economy and reducing the hazardous impact of the effluents discharged by this industry.

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Section: Diafiltration Of the Sw30 Concentrate Solution-synthetic Tannery Effluentsupporting

confidence: 61%

Recovery of Cr(III) from Tannery Effluents by Diafiltration Using Chitosan Modified Membranes

Zakmout

Sadi

Велизаров

et al. 2021

Water

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“…The adsorption mechanism of UiO-66-NH 2 is expected to be the ion exchange and electrostatic effect of -NH 2 and -COOH groups, combined with the material's nano-porous structure. 39,40 To investigate the competitive adsorption, the hybrid aerogel was immersed in a mixture solution containing 10 heavy metals, the results of which are presented in Fig. S9 (ESI †).…”

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confidence: 99%

Amyloid fibril-UiO-66-NH₂ aerogels for environmental remediation

et al. 2022

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“…As shown in Figure S5 and Table S6, after treatment by CuO for 48 h at 35 °C, the concentration of Cr 3+ was significantly reduced from 3438 to 0.06 mg/L, which was much below the discharge standard limit (GB 30486-2013; total Cr = 1.5 mg/L). 45,46 On the basis of the above results, it could be reasonably concluded that CuO was an efficient mineralization stabilizer for the removal of Cr 3+ ions from wastewater. 3+ .…”

Section: Superstable Mineralization Of Crmentioning

confidence: 75%

Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO

Shen

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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The removal of CrIII ions from contaminated wastewater is of great urgency from both environmental protection and resource utilization perspectives. Herein, we developed a superstable mineralization method to immobilize Cr3+ ions from wastewater using CuO as a stabilizer, leading to the formation of a CuCr layered double hydroxide (denoted as CuCr-LDH). CuO showed a superior Cr3+ removal performance with a removal efficiency of 97.97% and a maximum adsorption capacity of 207.6 mg/g in a 13000 mg/L Cr3+ ion solution. In situ and ex situ X-ray absorption fine structure characterizations were carried out to elucidate the superstable mineralization mechanism. Two reaction pathways were proposed including coprecipitation–dissolution and topological transformation. The mineralized product of CuCr-LDH can be reused for the efficient removal of organic dyes, and the adsorption capacities were up to 248.0 mg/g for Congo red and 240.1 mg/g for Evans blue, respectively. Moreover, CuCr-LDH exhibited a good performance for photocatalytic CO2 reduction to syngas (H2/CO = 2.66) with evolution rates of 54.03 μmol/g·h for CO and of 143.94 μmol/g·h for H2 under λ > 400 nm, respectively. More encouragingly, the actual tanning leather Cr3+ wastewater treated by CuO showed that Cr3+ can reduce from 3438 to 0.06 mg/L, which was much below discharge standards (1.5 mg/L). This work provides a new approach to the mineralization of Cr3+ ions through the “salt-oxide” route, and the findings reported herein may guide the future design of highly efficient mineralization agents for heavy metals.

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Insight into the efficient co-removal of Cr(VI) and Cr(III) by positively charged UiO-66-NH2 decorated ultrafiltration membrane

Cited by 89 publications

References 44 publications

Recovery of Cr(III) from Tannery Effluents by Diafiltration Using Chitosan Modified Membranes

Recovery of Cr(III) from Tannery Effluents by Diafiltration Using Chitosan Modified Membranes

Amyloid fibril-UiO-66-NH₂ aerogels for environmental remediation

Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO

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Insight into the efficient co-removal of Cr(VI) and Cr(III) by positively charged UiO-66-NH2 decorated ultrafiltration membrane

Cited by 89 publications

References 44 publications

Recovery of Cr(III) from Tannery Effluents by Diafiltration Using Chitosan Modified Membranes

Recovery of Cr(III) from Tannery Effluents by Diafiltration Using Chitosan Modified Membranes

Amyloid fibril-UiO-66-NH2 aerogels for environmental remediation

Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO

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Product

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Amyloid fibril-UiO-66-NH₂ aerogels for environmental remediation