Preparation of layered double hydroxides using boron mud and red mud industrial wastes and adsorption mechanism to phosphate

2016 ◽  
Vol 31 (2) ◽  
pp. 145-157 ◽  
Author(s):  
Pan Hu ◽  
Yihe Zhang ◽  
Fengzhu Lv ◽  
Wangshu Tong ◽  
Hao Xin ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Red Mud ◽  
Adsorption Mechanism ◽  
Industrial Wastes ◽  
Double Hydroxides ◽  
Boron Mud

scholarly journals Lysine-Functionalized Layered Double Hydroxides For The Antibiotics’ Efficient Removal: Controllable Fabrication Via BBD Model And Removing Mechanism

2021 ◽  
Author(s):  
Yuying Hu ◽  
Susu Liu ◽  
Min Qiu ◽  
Xiaohuan Zheng ◽  
Xiaoming Peng ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Adsorption Mechanism ◽  
Electrostatic Attraction ◽  
Adsorption Behavior ◽  
Molar Ratio ◽  
Order Kinetic ◽  
Efficient Removal ◽  
Adsorption Processes ◽  
Controllable Fabrication ◽  
Double Hydroxides

Abstract Ly @ FeZn layered double hydroxides (LDHs) controllable fabrication based on Box-Behnken Design (BBD) model was fabricated, and presented stable and efficient removal performance for Ciprofloxacin (CIP), Norfloxacin (NOR) and Ofloxacin (OFL) removal. It should be noted that Ly @ FeZn had different adsorption behavior towards CIP, NOR and OFL. Furthermore, the Ly @ FeZn was characterized by SEM, XRD, FT-IR and XPS. Results revealed the optimized fabrication condition (temperature of 60 °C, Fe / Zn molar ratio of 0.5 and the lysine dosage of 5.8 mmol) for the removing efficient. The highest adsorption capacity of CIP, NOR and OFL were 193.83, 190.20 and 62.12 mg/g, respectively. Adsorption kinetics of both CIP and NOR were well simulated with the pseudo-first-order kinetic model, while that of OFL was well-described by the pseudo-second-order. Moreover, the adsorption thermodynamics of CIP and NOR on Ly @ FeZn indicated that the adsorption processes were exothermal, feasible and spontaneous. It was worth noting that the adsorption mechanism of Ly @ FeZn for CIP and NOR were the synergistic reaction of electrostatic attraction, chemical bonding and flocculation. On the other side, the adsorption behavior of OFL was relatively low, and the adsorption mechanism was only electrostatic attraction.

scholarly journals Improving the flame retardancy of ethylene vinyl acetate composites by incorporating layered double hydroxides based on Bayer red mud

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Yi Qian ◽  
Kangjia Jiang ◽  
Long Li
Keyword(s):  
Vinyl Acetate ◽  
Flame Retardancy ◽  
Layered Double Hydroxides ◽  
Red Mud ◽  
Ethylene Vinyl Acetate ◽  
Precipitation Method ◽  
Infrared Spectrometry ◽  
Cone Calorimeter Test ◽  
Bayer Red Mud ◽  
Double Hydroxides

AbstractNowadays, reducing the hazards of bayer red mud (BRM) is an important research direction in the fields of environmental and safety. In this article, Mg/Al/Fe ternary layered double hydroxides (Mg/Al/Fe-LDHs) were synthesized successfully by a co-precipitation method based on introducing Mg2+ into the BRM suspension. The thermogravimetric analysis (TGA) results showed that the decomposition rate of LDHs is higher than that of BRM, which indicates that LDHs can absorb more heat than BRM during the decomposition process. Subsequently, BRM and LDHs were added into the ethylene vinyl acetate (EVA) to investigate its effects on reducing flammability of the composites. The cone calorimeter test (CCT) results demonstrated that 50 wt% LDH-B can make the peak value of HRR (PHRR) decrease from 1694.8 kW/m2 (EVA) to 199.2 kW/m2 (ELDH2). The smoke density test (SDT) results showed that the luminous flux of ELDH2 is nearly 95% at the end of test with a pilot flame, which is much higher than that of EVA and EBRM. The thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR) results confirmed that LDHs can improve the thermal stability of composites and reduce the production of some toxic gases. Compared with BRM, the improved flame retardancy of Mg/Al/Fe-LDHs is ascribed to the introduction of Mg2+, which offering an enhanced catalytic carbonization capability, as well as the physical barrier effect of char residue layer catalyzed by the lamellar LDHs

Adsorption mechanism of humic and fulvic acid onto Mg/Al layered double hydroxides

2008 ◽  
Vol 38 (3-4) ◽  
pp. 237-249 ◽  
Author(s):  
Steven Vreysen ◽  
André Maes
Keyword(s):  
Fulvic Acid ◽  
Layered Double Hydroxides ◽  
Adsorption Mechanism ◽  
Double Hydroxides

Synthesis of composite zeolite-layered double hydroxides using ultrasonic neutralized red mud

2020 ◽  
Vol 299 ◽  
pp. 110108 ◽  
Author(s):  
Claudia Belviso ◽  
Andreana Piancastelli ◽  
Michela Sturini ◽  
Sandra Belviso
Keyword(s):  
Layered Double Hydroxides ◽  
Red Mud ◽  
Double Hydroxides

scholarly journals Chloride Removal of Calcium Aluminate-Layered Double Hydroxide Phases: A Review

2021 ◽  
Vol 18 (6) ◽  
pp. 2797
Author(s):  
Gwangmok Kim ◽  
Sangwon Park
Keyword(s):  
Layered Double Hydroxides ◽  
Calcium Aluminate ◽  
Removal Rate ◽  
Structural Characteristics ◽  
Underlying Mechanism ◽  
Industrial Wastes ◽  
Synthesis Methods ◽  
Critical Element ◽  
Chloride Removal ◽  
Double Hydroxides

Chlorine is a critical element with respect to the use of fossil fuel, recycling of industrial wastes, and water purification. Chlorine could form toxic chemical compounds, corrode pipe systems and boilers, and contaminate surface and ground waters. Calcium aluminate-layered double hydroxides are one of the most promising materials to remove chlorides due to the chemisorption mechanism, since the phases have positively charged interlayers. Many studies on the synthesis and the characterization of calcium aluminate-layered double hydroxides have been extensively conducted, whereas few studies have been conducted on the chloride removal characteristics of the phases. The state-of-the-art studies on the synthesis methods and the structural characteristics of CaAl-LDH phases, the underlying mechanism on the removal of chlorides, and the potential removal rate and the capacity in the present study were thoroughly reviewed.

Adsorption of phosphorus by using magnetic Mg–Al-, Zn–Al- and Mg–Fe-layered double hydroxides: comparison studies and adsorption mechanism

2019 ◽  
Vol 26 (7) ◽  
pp. 7102-7114 ◽  
Author(s):  
Tianchen Sheng ◽  
Zhen Zhang ◽  
Yuncheng Hu ◽  
Yuetong Tao ◽  
Jiayi Zhang ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Adsorption Mechanism ◽  
Double Hydroxides

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

2019 ◽  
Vol 373 ◽  
pp. 258-270 ◽  
Author(s):  
Hai Nguyen Tran ◽  
Dong Thanh Nguyen ◽  
Giang Truong Le ◽  
Fatma Tomul ◽  
Eder C. Lima ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Layered Double Hydroxides ◽  
Adsorption Mechanism ◽  
Double Hydroxides

Adsorption mechanism of borate with different calcined layered double hydroxides in a molar ratio of 3:1

2019 ◽  
Vol 155 ◽  
pp. 296-310 ◽  
Author(s):  
Shuang Xu ◽  
Jiawen Zhao ◽  
Lidan Deng ◽  
Jinhua Niu ◽  
Xu Zhou ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Adsorption Mechanism ◽  
Molar Ratio ◽  
Double Hydroxides
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