Calcined Mg-Fe layered double hydroxide as an absorber for the removal of methyl orange

Peng, Chao; Dai, Jing; Yu, Jianying; Yin, Jian

doi:10.1063/1.4921455

Cited by 32 publications

(14 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…m 2 /g and 0.0048 cm 3 /g), and then to 4:1 (109 m 2 /g and 0.0047 cm 3 /g), respectively. This outcome is similar to the findings of some authors [25,26,37]; however, in contrast to the findings of Peng et al [44].…”

Section: Textural Propertysupporting

confidence: 90%

Adsorption mechanism of hexavalent chromium onto layered double hydroxides-based adsorbents: A systematic in-depth review

Tran

Nguyễn

et al. 2019

Journal of Hazardous Materials

208

View full text Add to dashboard Cite

An attempt has been made in this review to provide some insights into the possible adsorption mechanisms of hexavalent chromium onto layered double hydroxides-based adsorbents by critically examining the past and present literature. Layered double hydroxides (LDH) nanomaterials are typical dual-electronic adsorbents because they exhibit positively charged external surfaces and abundant interlayer anions. A high positive zeta potential value indicates that LDH has a high affinity to Cr(VI) anions in solution through electrostatic attraction. The host interlayer anions (i.e., Cl -, NO3 -, SO4 2-, and CO3 2-) provide a high anion exchange capacity (53-520 meq/100g) which is expected to have an excellent exchangeable capacity to Cr(VI) oxyanions in water. Regarding the adsorptioncoupled reduction mechanism, when Cr(VI) anions make contact with the electron-donor groups in the LDH, they are partly reduced to Cr(III) cations. The reduced Cr(III) cations are then adsorbed by LDH via numerous interactions, such as isomorphic substitution and complexation. Nonetheless, the adsorption-coupled reduction mechanism is greatly dependent on: (1) the nature of divalent and trivalent salts utilized in LDH preparation, and (2) the types of interlayer anions (i.e., guest intercalated organic anions). The low Brunauer-Emmett-Teller specific surface area of LDH (1.80-179 m 2 /g) suggests that pore filling played an insignificant role in Cr(VI) adsorption. The Langmuir maximum adsorption capacity of LDH (Q o max) toward Cr(VI) was significantly affected by the used inorganic salt natures and synthetic methods of LDH. The Q o max values range from 16.3 mg/g to 726 mg/g. Almost all adsorption processes of Cr(VI) by LDH-based adsorbent occur spontaneously (∆G° <0) and endothermically (∆H° >0) and increase the randomness (∆S° >0) in the system. Thus LDH has much potential as a material that can effectively remove anion pollutants, especially Cr(VI) anions in industrial wastewater.

show abstract

Section: Textural Propertysupporting

confidence: 90%

Adsorption mechanism of hexavalent chromium onto layered double hydroxides-based adsorbents: A systematic in-depth review

Tran

Nguyễn

et al. 2019

Journal of Hazardous Materials

208

View full text Add to dashboard Cite

show abstract

“…For instance, Parida et al [ 71 ] prepared MgFe-MMO by using coprecipitated MgFe-LDH as precursor and by calcining it at 500 °C for 7 h. The specific surface area was 168 m 2 /g (obtained by Qunatasorb-evo, Quantachrome Instruments, Boyton Beach, FL, USA) and exhibited high removal efficiency of selenite from aqueous solution with adsorption capacity 40 mg/g. Similarly, Yu et al [ 74 ] utilized LDH-originated MgFe-MMO to remove aqueous methyl orange (MO) (purchased from Shanghai Chemical Industry Company, Shanghai, China). They precipitated MgFe-LDH with different Mg/Fe molar ratio, treated precipitates under hydrothermal condition (120 °C, 24 h), and calcined LDH at 500 °C for 6 h. Due to the highly crystalline nature of hydrothermally prepared LDH, the S BET of prepared MMO lay in the low value range 38.2–48.7 m 2 /g (obtained from Micromeritics ASAP 2020, Micromeritics Instruments Corporation, Norcross, GA, USA).…”

Section: Specific Surface Area Of Mmo Prepared From Calcined Ldhmentioning

confidence: 99%

Mixed Metal Oxide by Calcination of Layered Double Hydroxide: Parameters Affecting Specific Surface Area

Lee

Park

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

Mixed metal oxide (MMO) is one of the widely utilized ceramic materials in various industries. In order to obtain high performance, the specific surface area of MMO should be controlled. Calcination of layered double hydroxide (LDH) is a versatile way to prepare MMO with homogeneous metal distribution and well-developed porosity. Although researchers found that the specific surface area of LDH-originated MMO was relatively high, it had not been systematically investigated how the surface area is controlled under a certain parameter. In this review, we summarized LDH-originated MMO with various starting composition, calcination temperature, and pore developing agent in terms of specific surface area and porosity. Briefly, it was represented that MMOs with Mg-Al components generally had higher specific surface area than Mg-Fe or Zn-Al components. Calcination temperature in the range 300–600 °C resulted in the high specific surface area, while upper or lower temperature reduced the values. Pore developing agent did not result in dramatic increase in MMO; however, the pore size distribution became narrower in the presence of pore developing agents.

show abstract

“…Upon heating the LDH loses surface bound and interlayer water. The LDH then undergoes dehydroxylation of the brucite-like layers and then the interlayer CO3 2is evolved as CO2 [17]. There are no visible reflections relating to the LDH or spinel ZnAl2O4 structures.…”

Section: Adsorbent Regenerationmentioning

confidence: 99%

“…More recently however, the capability of LDHs and MMOs as dye adsorbents has been studied. The most extensive area of research into dye adsorption onto MMO/LDH adsorbents has been focussed on acidic dyes with methyl orange, possibly due to its inherent toxicity, being a recurring pollutant of interest [15][16][17][18]. Nevertheless, there is a substantial number of LDHs and an even greater range of synthetic dyes [19][20][21][22] so more work is needed in this area to establish LDH based adsorbents as a means of removing and recovering dyes from wastewater streams.…”

Section: Introductionmentioning

confidence: 99%

Continuous Synthesis of Zn2Al-CO3 Layered Double Hydroxides for the Adsorption of Reactive Dyes from Water

Clark

Smith

Gomes

et al. 2019

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

A novel pilot scale approach to continuous synthesis of layered double hydroxides (LDHs) was used to produce Zn2Al-CO3. The Zn2Al-CO3 was calcined and used in the adsorption of Reactive Black 5 (RB5) and Reactive Orange 16 (RO16) from water. The specific surface area of the LDH was 50.1 m 2 g -1 , while the surface area of the calcined LDH (MMO) was 57.8 m 2 g -1 . X-ray diffraction indicated complete breakdown of the LDH at 500°C for 4 hours, with amorphous Al2O3 or AlOOH alongside ZnO. Reaction variables in the adsorption system; temperature, adsorbent dose, pH, initial concentration and the effect of competing anions were investigated across four temperatures from 10°C to 40°C. Maximum adsorption capacity calculated from the Langmuir isotherm was 895 mg g -1 and 589 mg g -1 at 20°C, for RB5 and RO16, respectively. Intercalation of dye molecules was the main mode of adsorption, as indicated by shifts in (003) reflection from 11.5° to 4.5° and 3.2° for RB5 and RO16 respectively. Adsorption was best modelled by the pseudo 2 nd order kinetic model. The intra-particle diffusion model indicated multiple stages of adsorption; surface adsorption occurs initially, followed by, A c c e p t e d M a n u s c r i p t 3 intra-particle diffusion of dye molecules into the interlayer region. Regeneration through calcination resulted in an adsorption equal to 99±2%.

show abstract

Calcined Mg-Fe layered double hydroxide as an absorber for the removal of methyl orange

Cited by 32 publications

References 29 publications

Adsorption mechanism of hexavalent chromium onto layered double hydroxides-based adsorbents: A systematic in-depth review

Adsorption mechanism of hexavalent chromium onto layered double hydroxides-based adsorbents: A systematic in-depth review

Mixed Metal Oxide by Calcination of Layered Double Hydroxide: Parameters Affecting Specific Surface Area

Continuous Synthesis of Zn2Al-CO3 Layered Double Hydroxides for the Adsorption of Reactive Dyes from Water

Contact Info

Product

Resources

About