Removal of perchlorate from aqueous solution using quaternary ammonium modified magnetic Mg/Al-layered double hydroxide

Meng, Zilin; Fan, Jiaxuan; Cui, Xiaoyan; Yan, Yumei; Ju, Ziwei; Lu, Riyu; Zhou, Wenfeng; Gao, Haixiang

doi:10.1016/j.colsurfa.2022.129111

Cited by 6 publications

(3 citation statements)

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“…In addition, the research on the recycling and reuse of adsorbents has great significance in regards to the sustainability of resources. − However, most techniques adopt the decomposition–reconstruction cycle route requiring calcined LDH, which undoubtedly increased the carbon emission. ,, Meanwhile, the adsorption rate of LDHs after secondary calcination is greatly decreased, leading to low utilization. − In fact, LDHs as highly efficient and environmentally friendly PVC thermal stabilizers have been used widely. − The alkalinity of LDHs can directly neutralize HCl reducing the autocatalytic effect; however the Cl – ion can also exchange into the interlayer though interaction with the interlayer guest and form Cl – intercalated LDHs further inhibiting the chain degradation reaction. − The service life of petroleum-based PVC can be extended with LDHs, which reduce the use of petroleum components and enhance sustainability. Thus far, no investigation exploring application of recovered LDHs as a PVC thermal stabilizer has been conducted, especially for ClO 4 – intercalated hydrotalcites. ,,, …”

Section: Introductionmentioning

confidence: 99%

“…Thus far, no investigation exploring application of recovered LDHs as a PVC thermal stabilizer has been conducted, especially for ClO 4 − intercalated hydrotalcites. 30,31,67,68 Here we evaluate the capability of calcined LDHs to adsorbed ClO 4 − in wastewater utilizing sonication with subsequent evaluation of recovered ClO 4 − -LDH for efficacy as a PVC stabilizer. The most prevalent Mg−Al-LDH was synthesized and calcined to endow it with the ability to intercalate anions.…”

Section: Introductionmentioning

confidence: 99%

“…Thus far, no investigation exploring application of recovered LDHs as a PVC thermal stabilizer has been conducted, especially for ClO 4 – intercalated hydrotalcites. 30 , 31 , 67 , 68 …”

Section: Introductionmentioning

confidence: 99%

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Ultrasound-Assisted Adsorption of Perchlorate Using Calcined Hydrotalcites and the Thermal Stabilization Effect of Recycled Adsorbents on Poly(vinyl chloride)

Cui,

Zhang,

Wladyka

et al. 2023

ACS Omega

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Due to their high anion exchange and memory effect, the layered double hydroxides (LHDs) have wide applications for some areas. In this work, an efficient and green recycling route for layered double hydroxide based adsorbents is proposed specifically for application as a poly(vinyl chloride) (PVC) heat stabilizer without requiring secondary calcination. Conventional magnesium−aluminum hydrotalcite was synthesized using the hydrothermal method followed by removal of carbonate anion (CO 3 2− ) between LDH layers by calcination. The adsorption of perchlorate anion (ClO 4 − ) by the memory effect of calcined LDHs with and without ultrasound assistance was compared. Using ultrasound assistance, the maximum adsorption capacity of the adsorbents (291.89 mg/g) was increased, and the adsorption process was fitted using the kinetic Elovich rate equation (R 2 = 0.992) and Langmuir adsorption model (R 2 = 0.996). This material was characterized using XRD, FT-IR, EDS, and TGA which demonstrated that ClO 4 − was intercalated into the hydrotalcite layer successfully. The recycled adsorbents were used to augment a commercial calcium−zinc-based PVC stabilizer package applied in a epoxidized soybean oil plasticized cast sheet which is based on an emulsion type PVC homopolymer resin. Use of perchlorate intercalated LDH augmentation yielded significant improvement to static heat resistance as indicated by the degree of discoloration with a life extension of approximately 60 min. The improved stability was corroborated by evaluation of HCl gas evolved during thermal degradation using conductivity change curves and the Congo red test.

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