Calcined Mg/Al-LDH for acidic wastewater treatment: Simultaneous neutralization and contaminant removal

Laipan, Minwang; Fu, Haoyu; Sun, Luyi; Steel, Rachel; Ye, Sujuan; Zhu, Jianxi; He, Hongping

doi:10.1016/j.clay.2017.12.002

Cited by 42 publications

(9 citation statements)

References 35 publications

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“…Furthermore, chromates influenced the adsorption of cations. The increase of the Cr(VI) concentration lowered the removal of Zn and other metals by Mg–Al LDH [55].…”

Section: Resultsmentioning

confidence: 99%

Removal of Chromates and Sulphates by Mg/Fe LDH and Heterostructured LDH/Halloysite Materials: Efficiency, Selectivity, and Stability of Adsorbents in Single- and Multi-Element Systems

Matusik

Rybka

2019

Materials

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Industrial wastewaters often contain mobile and toxic anions that cannot be removed by precipitation techniques and most known adsorbents. Layered double hydroxides (LDH) are excellent scavengers of anions; however, their use in real applications is of minor importance owing to their swelling behavior and high cost of production. The performed research shows the possibility of obtaining Mg/Fe LDH using natural magnesite. Moreover, heterostructured LDH/halloysite materials were synthesized. The adsorption efficiency of these materials was very high in both single- and multi-element systems, confirming the LDH selectivity. This was with the exception of wastewaters containing a high concentration of chlorides, which clearly hampered the removal of Cr(VI) and S(VI). The measurements indicated that LDH dissolution took place to a small extent (<10 wt%). The LDH/halloysite materials showed lower efficiency than the raw LDH; however, the clay presence has several benefits in terms of future applications: (i) it significantly reduces the pH, especially in contrast to the calcined LDH, which enables the reuse or safe disposal of purified water; (ii) it reduces swelling of the composite, which opens the possibility for applications in column adsorption; (iii) it induces dual adsorption properties through additional cation adsorption; and (iv) it substantially lowers the price of the adsorbent.

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“…Furthermore, chromates influenced the adsorption of cations. The increase of the Cr(VI) concentration lowered the removal of Zn and other metals by Mg–Al LDH [55].…”

Section: Resultsmentioning

confidence: 99%

Removal of Chromates and Sulphates by Mg/Fe LDH and Heterostructured LDH/Halloysite Materials: Efficiency, Selectivity, and Stability of Adsorbents in Single- and Multi-Element Systems

Matusik

Rybka

2019

Materials

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“…247 Therefore, the removal of heavy metals from environmental medium such as water remains a key subject of research. Previous studies suggested that functionalized LDHs exhibit very favorable adsorption to heavy metals as measured by high adsorption capacity and selectivity, 2,66,76,247,[250][251][252] which resulted in effective removal of toxic metals to meet increasingly strict environmental regulations. For example, Ma and coworkers found that the intercalation of MoS4 2into MgAl-LDH interlayer space could not only endow MgAl-LDH with the ability to adsorb various heavy metal ions (Co 2+ , Ni 2+ , Zn 2+ , Cd 2+ , Pb 2+ , Cu 2+ , Hg 2+ , and Ag + ) rapidly and effectively, but also offer high selectivity for some of these heavy metals.…”

Section: Heavy Metals Removalmentioning

confidence: 99%

Functionalized layered double hydroxides for innovative applications

et al. 2020

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“…The calcined Mg/Al layered double hydroxide (Mg/Al-CLDH) was used for simultaneously neutralizing the pH of AD and removing various heavy metal cations and oxyanions (Cr(VI) and phosphate) (Laipan et al, 2018).…”

Section: Treatment Technologiesmentioning

confidence: 99%

Characterization and Treatment of Mine Drainage

Wei¹,

Zhang²,

Han³

et al. 2018

Water Environment Research

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The recent research and development on mine drainage published in 2017 was summarized in this review. In particular, this review was focused on three main aspects: 1) mine drainage and its environmental impact, 2) prediction and prevention, and 3) treatment technologies. The first section covers physiochemical characterization, microbiological characterization, and environmental impacts. The second section includes mine drainage prediction and prevention. The final section focuses physiochemical treatment, biological treatment, passive treatment, and beneficial uses of mine drainage and treatment wastes.

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Calcined Mg/Al-LDH for acidic wastewater treatment: Simultaneous neutralization and contaminant removal

Cited by 42 publications

References 35 publications

Removal of Chromates and Sulphates by Mg/Fe LDH and Heterostructured LDH/Halloysite Materials: Efficiency, Selectivity, and Stability of Adsorbents in Single- and Multi-Element Systems

Removal of Chromates and Sulphates by Mg/Fe LDH and Heterostructured LDH/Halloysite Materials: Efficiency, Selectivity, and Stability of Adsorbents in Single- and Multi-Element Systems

Functionalized layered double hydroxides for innovative applications

Characterization and Treatment of Mine Drainage

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