In-situ synthesis of calcium aluminum layered double hydroxides for advanced treatment of leachate biochemical tail water

Xu, Yunfeng; Ding, Ying; Wang, Jingjing; Zhu, Mingying; Yang, Min; Qian, Guangren; Sun, Yong

doi:10.1016/j.scitotenv.2019.134891

Cited by 7 publications

(4 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Calcination temperature is also one of the key factors affecting the adsorption performance of calcined LDH. , Therefore, the effect of calcination temperature on the adsorption of glyphosate by calcined Ca–Al LDH was investigated in the range of 300 to 700 °C. To enlarge the performance gap of the adsorbent, the dosage of the adsorbent was reduced from 1.4 to 1.0 g/L with other adsorption conditions unchanged.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Among the hydrotalcite-like materials, Ca–Al LDH intercalated with CO 3 2– has the lowest production cost, which is more suitable for large-scale application as an adsorbent in the adsorption field. − Herein, Ca–Al LDH intercalated with CO 3 2– was cleanly prepared from Ca(OH) 2 , Al(OH) 3 , and CO 2 , and its calcined product was applied to the adsorption of glyphosate. The effects of preparation methods on the adsorption of glyphosate by calcined Ca–Al LDH were investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Preparation Methods on the Adsorption of Glyphosate by Calcined Ca–Al Hydrotalcite

2021

View full text Add to dashboard Cite

Calcined Ca−Al hydrotalcites were prepared by the clean method (Ca-LDO-1) and traditional co-precipitation method (Ca-LDO-2), respectively. The effect of the preparation method on the adsorption of glyphosate by calcined Ca−Al hydrotalcites was investigated. The adsorbents were also characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), and low-temperature N 2 adsorption− desorption, respectively. Compared with Ca-LDO-2, Ca-LDO-1 had higher specific surface area and pore volume, which caused it to show better adsorption performance and reusability for the adsorbing of glyphosate. In addition, the kinetics and thermodynamics of the adsorption of glyphosate by Ca-LDO-1 were studied. The results showed that it was more consistent with the pseudo-secondorder kinetic equation and Langmuir isotherm equation.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Preparation Methods on the Adsorption of Glyphosate by Calcined Ca–Al Hydrotalcite

2021

View full text Add to dashboard Cite

show abstract

“…Furthermore, previous research indicated that Ca/Al-LDH can effectively remove chemical oxygen demand (COD; 73.9%), UV254 (85.8%), and total organic carbon (TOC; 74.7%) from water [25]. The authors [25] also found that COD removal by the LDH material (73.9%) was higher than that by the ion exchange resin (only 60%). Notably, Rahman and colleagues [22] compared sludge volume formed during the removal process of heavy metals using Mg/Al-LDH and Ca(OH) 2 .…”

Section: -mentioning

confidence: 94%

Dual-Electronic Nanomaterial (Synthetic Clay) for Effective Removal of Toxic Cationic and Oxyanionic Metal Ions from Water

Nguyen

Ton³

et al. 2020

Journal of Nanomaterials

View full text Add to dashboard Cite

A synthetic clay (Mg/Al-layered double hydroxides; LDH) was directly synthesized through a simple coprecipitation method under a low-supersaturation condition. The clay was applied to remove metal cations (Cd2+, Cu2+, Pb2+, Ni2+, and Cr3+) and oxyanions (MnO4– and Cr2O72–) from a single aqueous solution. The result demonstrated that LDH exhibited a poor porosity (its specific surface area and total pore volume: 23.2 m2/g and 0.161 cm3/g, respectively) and positively charged surface within solution pH from 3.0 to 12. The X-ray powder diffraction (XRD) data suggested that the basal spacing of LDH was 0.773 nm. The presence of active CO32– anions in the interlayer region of LDH that played an extremely important role in the adsorption process was identified by XRD and Fourier-transform infrared spectroscopy (FTIR). Energy-dispersive X-ray spectroscopy (SEM) analysis indicated that LDH possessed a surface morphology like a plate with a hexagonal shape. The adsorption isotherms of LDH towards various potentially toxic metals were conducted at 1.0 g/L, pHEquilibrium 5.0, 30°C, and 24 h. The Langmuir maximum adsorption capacity of LDH towards the target metals exhibited the following order: 1.299 mmol/g (for Ni2+ adsorption) > 0.880 mmol/g (Cd2+) > 0.701 mmol/g (Cr3+) > 0.657 mmol/g (Pb2+) > 0.601 mmol/g (Cu2+) > 0.589 mmol/g (Cr2O72–) > 0.522 mmol/g MnO4–. The synthetic clay can adsorb both cations and anions in the solution. Therefore, such LDH material can serve as a potential dual-electronic adsorbent for effectively eliminating various oxyanionic and cationic metal ions from water media.

show abstract

“…Figure 1(d), shows that during the ZVI/Peroxone and controlled processes, the removal efficiencies shown by the three indices follow the order CN > UV 254 > TOC. Since the CN in leachate is composed of the chromogenic and achromogenic groups in organics (Wang et al, 2020c), UV 254 represents the relative content of organics containing benzene-ring structures (Xu et al, 2020) and TOC removal represents the final mineralization of organics. These results are consistent with Chen et al (2020a) who also showed that the chromogenic/chromogenic groups within refractory organics in leachate are more easily degraded, whereas the mineralization of organics is more difficult.…”

Section: Comparison Experimentsmentioning

confidence: 99%

Treatment of refractory organics in biologically treated landfill leachate by a zero valent iron enhanced Peroxone process: Degradation efficiency and mechanism study

Bai

Yang

2022

Waste Manag Res

View full text Add to dashboard Cite

A zero valent iron (ZVI) enhanced Peroxone process (ZVI/Peroxone) was used to treat biologically treated landfill leachate (BTL). The treatment efficiency of the ZVI/Peroxone process was compared to single (ZVI, O3 and H2O2) and dual (ZVI/H2O2, Fe0/O3 and Peroxone) processes. The results showed that ZVI can greatly enhance the treatment capability of the Peroxone process, and the color number (CN), absorbance at 254 nm (UV254), and total organic carbon (TOC) removal efficiencies were 98.82, 84.30 and 66.38%, respectively. In the ZVI/Peroxone process, higher O3 and ZVI dosages improved organics removal, and H2O2 could promote organics removal within a certain dosage range. However, too much H2O2 decreased treatment efficiency. The best treatment performance by the ZVI/Peroxone process was obtained under acidic conditions. The three-dimensional excitation and emission matrix analysis showed that BTL mainly contained two fluorescent substances, which were fulvic-like substances in the ultraviolet region (Ex/Em = 235–255 nm/410–450 nm) and fulvic-like substances in the visible light region (Ex/Em = 310–360 nm/370–450 nm). Fluorescent substances could be substantially degraded by the ZVI/Peroxone process during the early stages of the reaction. An analysis of ZVI morphology and element valency changes showed that the micro Fe0 particles used in this study remained highly reactive during the process. The ZVI enhanced the homogenous Fenton, heterogeneous Fenton, and coagulation-flocculation effects during the Peroxone process.

show abstract

In-situ synthesis of calcium aluminum layered double hydroxides for advanced treatment of leachate biochemical tail water

Cited by 7 publications

References 40 publications

Effect of Preparation Methods on the Adsorption of Glyphosate by Calcined Ca–Al Hydrotalcite

Effect of Preparation Methods on the Adsorption of Glyphosate by Calcined Ca–Al Hydrotalcite

Dual-Electronic Nanomaterial (Synthetic Clay) for Effective Removal of Toxic Cationic and Oxyanionic Metal Ions from Water

Treatment of refractory organics in biologically treated landfill leachate by a zero valent iron enhanced Peroxone process: Degradation efficiency and mechanism study

Contact Info

Product

Resources

About