Hydroxyapatite nanoparticles (HAp NPs) were synthesized with Muntingia calabura leaf extract as solvent and eggshell waste as a calcium source. The synthesized nanoparticles were irregular rod-like, as visualized by FESEM, while EDX and XPS studies confirmed the formation of hydroxyapatite. The synthesized HAp NPs were polycrystalline and highly thermostable as per XRD and TGA studies respectively. FTIR confirmed the stable coating of plant phytochemicals onto the HAp NPs. Congo red adsorption using HAp NPs nanoadsorbent was optimized by central composite design, wherein 89.96% of 33.18 mg/L dye was adsorbed in 137 min at 180 RPM. The adsorption process was in line with pseudo-second-order model and the Freundlich isotherm indicated chemical adsorption. The adsorption process was feasible, exothermic, and spontaneous as indicated by the thermodynamic studies. The adsorption capacity of HAp NPs stood at a maximum of 217 mg/g, indicating its superiority among other adsorbents reported earlier. It is evident from the convincing results that the HAp NPs synthesized in the present investigation may have a major role in developing novel adsorbents for dye removal out of wastewater streams. 

Bioinspiration synthesis of hydroxyapatite nanoparticles using eggshells as a calcium source: Evaluation of Congo red dye adsorption potential

Experimental investigation of the drainage characteristic and stability mechanism of gel-stabilized foam used to extinguish coal fire

The high nickel layered oxide cathode LiNi0.8Co0.1Mn0.1O2 (NCM811) is widely used in new energy power and equipment due to its high density and low cost. However, the NCM811 cathode is prone to structural rupture, dissolution of transition metal ions, and damage to the electrode/electrolyte interface under high voltage, causing degradation of battery performance and safety issues. In this paper, 3-(Trifluoromethyl)benzoylacetonitrile (3-TBL) was selected as a film-forming flame-retardant additive for the NCM811 cathode of the high-voltage lithium-ion battery, and the synergistic effect with lithium difluoro(oxalato)borate enhanced the battery cycle and safety performance. The results show that: 3-TBL is oxidized preferentially more than carbonate solvent to form a stable and dense cathode-electrolyte interface film, which effectively prevents the continuous oxidative decomposition of the electrolyte and enhances the rate of cycling and overcharge resistance of the Li/NCM811 cells under high pressure. Furthermore, the 3-TBL modified electrolyte can also delay the thermal decomposition temperature of the commercial electrolyte and improve its flame retardant properties. Kinetic analysis showed that the additive increased the activation energy required for the thermal decomposition reaction of electrolyte and NCM811 cathode mixture. Therefore, the additives 3-TBL improve the intrinsic safety of the electrolyte and electrolyte interface, providing a feasible idea for the development of high energy density and high safety electrolytes. 

3-(Trifluoromethyl)benzoylacetonitrile: A multi-functional safe electrolyte additive for LiNi0.8Co0.1Mn0.1O2 cathode of high voltage lithium-ion battery

Study of the microstructure and oxidation characteristics of residual coal in deep mines

Microstructure of coal spontaneous combustion in low-oxygen atmospheres at characteristic temperatures

Thermal hazards analysis for benzoyl peroxide in the presence of hexanoic acid

Benzoyl peroxide (BPO) is a common cross-linking agent and initiator that is widely used in the chemical industry. The instability of a substance may be influenced by the presence of impurities; therefore, the thermal hazard of organic peroxides under contamination has always been a topic of interest. In this study, the effects of hexanoic acid (HAA) on the thermal decomposition of BPO were investigated using differential scanning calorimetry (DSC; 2.0, 4.0, 6.0, 8.0, and 10.0 °C/min) experiments. By using the Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa kinetic models, the progress of the obtained DSC curve was fitted linearly, and the thermokinetic parameters of BPO in the presence of HAA were further calculated. The two apparent activation energy calculations consistently indicated that HAA increased the thermal hazard of BPO. In addition, the Coats-Redfern model was adopted to compute the decomposition mechanism function of each phase of the material, and Gaussian 16 was used to determine the atomic bonding levels between the molecules to discover the thermal decomposition reaction path of BPO under the effect of HAA. The study results can be used as a reference for the loss prevention and control of BPO in practical engineering applications. 

Magnetic Fe3O4 nanoparticles loaded papaya (Carica papaya L.) seed powder as an effective and recyclable adsorbent material for the separation of anionic azo dye (Congo Red) from liquid phase: Evaluation of adsorption properties

Michael Pasquier

Papers

Microstructure of coal spontaneous combustion in low-oxygen atmospheres at characteristic temperatures

Microstructure of coal spontaneous combustion in low-oxygen atmospheres at characteristic temperatures

Thermal hazards analysis for benzoyl peroxide in the presence of hexanoic acid

Thermal hazards analysis for benzoyl peroxide in the presence of hexanoic acid

Magnetic Fe3O4 nanoparticles loaded papaya (Carica papaya L.) seed powder as an effective and recyclable adsorbent material for the separation of anionic azo dye (Congo Red) from liquid phase: Evaluation of adsorption properties