An alternative method for preparation of polyaluminum chloride coagulant using fresh aluminum hydroxide gels: Characterization and coagulation performance

Tang, Xiaomin; Zheng, Huaili; Teng, Houkai; Zhao, Chun; Wang, Yili; Xie, Wanying; Wei, Chen; Yang, Chun

doi:10.1016/j.cherd.2015.08.009

Cited by 31 publications

(9 citation statements)

References 35 publications

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“…The absolute value of the Zeta potential is mainly used to characterize the stability of the solution. A greater absolute value for the Zeta potential indicates a more stable solution [35,36]. Therefore, the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min.…”

Section: Zeta Potential Measurement For the Electrolytementioning

confidence: 99%

Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

Xu²,

Guo

et al. 2019

SN Appl. Sci.

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In this study, β-PbO 2-Co 3 O 4 composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and Co 3 O 4 particles. The preparation process study shows that the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min. Co 3 O 4 particles in the β-PbO 2 bath are positively charged, with anions being adsorbed onto the particles. The nucleation behavior study shows that the electric field force plays a dominant role in the adsorption process for the Co 3 O 4 particles. The nucleation and growth of β-PbO 2 on the Co 3 O 4 particles started for the particles closer to the substrate. In addition, the thickness of the β-PbO 2 layer on the Co 3 O 4 particles was inversely proportional to the distance between the Co 3 O 4 particles and the substrate. Compared to the pure PbO 2 electrode, the oxygen evolution overpotentials for the β-PbO 2-Co 3 O 4 electrode are decreased significantly, which demonstrates an energy-saving effect.

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Section: Zeta Potential Measurement For the Electrolytementioning

confidence: 99%

Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

Xu²,

Guo

et al. 2019

SN Appl. Sci.

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“…They found that, at an optimum dose, PAC performed better in removing turbidity as compared to TiCl 4 , which is in contradiction with the current study. This could be due to the lower basicity of the utilised PAC in the current study, leading to the formation of less amount of positively charged Al(OH) n (3-n)+ hydrolyzates [38,39]. Besides, the number of valence electrons in Ti is higher than that of Al and, upon hydrolysis, vigorously generates highly charged positive hydrolyzates (Ti(OH) n (4-n)+ ), attributing to elevated charge neutralization capacity [14,40].…”

Section: Coagulation Efficiency Of Ticl 4 Comparing Pacmentioning

confidence: 81%

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

et al. 2020

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The purpose of the study was to effectively treat algae bloomed water while using a Ti-based coagulant (TiCl4) and recover photoactive novel anatase TiO2 from the flocculated sludge. Conventional jar tests were conducted in order to evaluate the coagulation efficiency, and TiCl4 was found superior compared to commercially available poly aluminum chloride (PAC). At a dose of 0.3 g Ti/L, the removal rate of turbidity, chemical oxygen demand (COD), and total phosphorus (TP) were measured as 99.8%, 66.7%, and 96.9%, respectively. Besides, TiO2 nanoparticles (NPs) were recovered from the flocculated sludge and scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and X-ray diffraction (XRD) analysis confirmed the presence of only anatase phase. The recovered TiO2 was found to be effective in removing gaseous CH3CHO and NOx under UV-A lamp at a light intensity of 10 W/m2. Additionally, the TiO2 mixed mortar blocks that were prepared in this study successfully removed atmospheric nitrogen oxide (NOx) under UV irradiance. This study is one of the first to prepare anatase TiO2 from flocculated algal sludge and it showed promising results. Further research on this novel TiO2 concerning internal chemical bonds and shift in the absorbance spectrum could explore several practical implications.

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“…Both PAC and silica gel show amorphous broad peaks. 42 The new composite material obtained after grinding mainly shows the amorphous broad peaks of silica gel. It can be found that the score center of the peak at 22° is slightly shifted from 22.1 to 22.5°.…”

Section: Resultsmentioning

confidence: 99%

Exploring the In Situ Formation Mechanism of Polymeric Aluminum Chloride–Silica Gel Composites under Mechanical Grinding Conditions: As a High-Performance Nanocatalyst for the Synthesis of Xanthene and Pyrimidinone Compounds

et al. 2022

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The use of mechanical ball milling to facilitate the synthesis of organic compounds has attracted intense interest from organic chemists. Herein, we report a new process for the preparation of xanthene and pyrimidinone compounds by a one-pot method using polymeric aluminum chloride (PAC), silica gel, and reaction raw materials under mechanical grinding conditions. During the grinding process, polymeric aluminum chloride and silica gel were reconstituted in situ to obtain a new composite catalyst (PAC–silica gel). This catalyst has good stability (six cycles) and wide applicability (22 substrates). The Al–O–Si active center formed by in situ grinding recombination was revealed to be the key to the effective catalytic performance of the PAC–silica gel composites by the comprehensive analysis of the catalytic materials before and after use. In addition, the mechanism of action of the catalyst was verified using density functional theory, and the synthetic pathway of the xanthene compound was reasonably speculated with the experimental data. Mechanical ball milling serves two purposes in this process: not only to induce the self-assembly of silica and PAC into new composites but also to act as a driving force for the catalytic reaction to take place. From a practical point of view, this “one-pot” catalytic method eliminates the need for a complex preparation process for catalytic materials. This is a successful example of the application of mechanochemistry in materials and organic synthesis, offering unlimited possibilities for the application of inorganic polymer materials in green synthesis and catalysis promoted by mechanochemistry.

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An alternative method for preparation of polyaluminum chloride coagulant using fresh aluminum hydroxide gels: Characterization and coagulation performance

Cited by 31 publications

References 35 publications

Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

Exploring the In Situ Formation Mechanism of Polymeric Aluminum Chloride–Silica Gel Composites under Mechanical Grinding Conditions: As a High-Performance Nanocatalyst for the Synthesis of Xanthene and Pyrimidinone Compounds

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