Measurements of zinc oxide solubility in sodium hydroxide solution from 25 to 100 °C

Chen, Ailiang; Xü, Dong; Chen, Xingyu; Zhang, Wenyong; Liu, Xuheng

doi:10.1016/s1003-6326(11)61349-6

Cited by 35 publications

(19 citation statements)

References 11 publications

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“…At pH < 2, iron is known to remain soluble [36]. This is supported by Equations (4)- 7below [37]. The extraction of Ni and Pb increased with increased chloride lixiviants.…”

Section: Extraction In Trifluoromethanesulfonic Acid (Tfms)mentioning

confidence: 74%

“…The highest extraction of Zn as NaZn(OH) 3 in NaOH lixiviants was supported by the report by the literature that ZnO solid exists in the equilibrium state in the low-concentration alkali regions and the solubility of zinc oxide is almost invariable with temperature. When alkali concentration was increased, there was suddenly shift in the equilibrium as reactant ZnO reacted with hydroxide to form product NaZn(OH) 3 , which indicated higher dissolution of Zn [37].…”

Section: Extraction In Hydroxide Mediamentioning

confidence: 99%

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Extraction of Copper and Zinc from Waste Printed Circuit Boards

et al. 2019

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The recovery of valuable metals from waste printed circuit boards (WPCBs) is crucial in order to harness their economic resources, and prevents potential environmental contamination. However, selective extraction of Cu and Zn, and the co-extraction of other metals as impurities at ambient temperature using selected lixiviants such as HCl, H2SO4, HNO3, trifluoromethanesulfonic acid (TFMS), NaOH, and mixtures of NaCl and CuCl2 was studied. It is shown that the extraction efficiencies of all the metals increased with increases in lixiviant concentrations. High selectivity of Cu and Zn toward Fe were achieved in dilute H2SO4, HNO3, TFMS, and 0.5 M NaCl + 0.1 M CuCl2, and low dissolution of Pb (<5%) was observed in all H2SO4 lixiviants. Almost 100% Zn extraction using NaOH lixiviants without trace of other metals was achieved. Therefore, 0.5 M NaCl + 0.5 M CuCl2, 1.0 M HNO3, 0.5 M H2SO4, and 1.0 M TFMS showed high extraction selectivity toward Cu and Zn with low chemical consumption, and produced pregnant leach solution rich in Cu and Zn, as well as residue containing Fe, Ni, and other metals.

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“…At pH < 2, iron is known to remain soluble [36]. This is supported by Equations (4)- 7below [37]. The extraction of Ni and Pb increased with increased chloride lixiviants.…”

Section: Extraction In Trifluoromethanesulfonic Acid (Tfms)mentioning

confidence: 74%

Section: Extraction In Hydroxide Mediamentioning

confidence: 99%

Extraction of Copper and Zinc from Waste Printed Circuit Boards

et al. 2019

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“…(Figure c, also see Movies S1 and S2, Supporting Information). Robust oleophobicity was maintained with pH from 1 to 7, but the CA of oil droplet in water decreased to ≈110° as well, with pH value increased to 11, which is attributed to the reaction with basic solution (or dissolution), and subsequent surface morphology change . Thus, ZnO@PVDF Janus membrane presented different wettability on each side, i.e., superhydrophilicity and hydrophobicity, as shown in Movie S3 in the Supporting Information.…”

Section: Resultsmentioning

confidence: 96%

Buoyancy Assisted Janus Membrane Preparation by ZnO Interfacial Deposition for Water Pollution Treatment and Self‐cleaning

Pan

Shou

et al. 2019

Adv Materials Inter

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Water pollution, such as marine oil spill and organic chemicals pollution, is a worldwide challenge. To advance this emerging field, Janus membranes with asymmetric wettability, for oil–water separation, similitude of diode in electrocircuit, are fabricated by leveraging the buoyancy of poly(vinylidene fluoride) nanofiber on water/air interface. ZnO nanowires are in situ grown on the surface of nanofibers immersed in the solution, mimicking a nanoscale Setaria viridis structure. Such Janus membrane shows a good hydrophilicity/underwater oleophobicity on ZnO nanowires modified side and exhibits opposite hydrophobicity on the other side. Due to the side‐specific morphologies, this membrane can work either as “water‐removing” type or “oil‐removing” type filter as a diode in fluid. The membrane shows excellent permeability with the water and oil flux up to 1210 and 7653 L m−2 h−1, respectively, only driven by gravity. The durability of functional membrane is excellent and separation efficiency is higher than 97.24% after ten cycling tests. Furthermore, the hydrophilic side demonstrates an excellent photocatalytic performance over the degradation of rhodamine B dye, as self‐cleaning properties. This Janus membrane is to be an excellent candidate for wastewater remediation, both oil/water separation and organic pollutant decomposition.

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“…2c shows schematic drawing of the ITO NWs on ITO/ZnO/Si substrate that will be used to fabricate flexible ITO NWs electrode. Previous studies have shown that ZnO has high solubility in sodium hydroxide (NaOH) solution with a high alkali concentration ( 4pH 12), i.e., it can be easily dissolved to form soluble NaZn(OH) 3 as shown in Eq (1) [29,30].…”

Section: Wet-etching Of Sacrificial Zno Layermentioning

confidence: 99%