Study on structural characterization and algae-removing efficiency of polymeric aluminum ferric sulfate (PAFS)

Zheng, Huaili; Jiang, Zhenzhen; Zhu, Jun; Tan, Mingzhuo; Feng, Li; Liu, Liwei; Chen, Wei

doi:10.1080/19443994.2012.758060

Cited by 11 publications

(8 citation statements)

References 23 publications

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“…The result of SEM shows that the samples of PAFS generally existed as a formless material. The molecular density of PAFS increased, and the structure became more compact with an increase of basicity, which was in accordance with the previous results . The surface of the aggregate was rough, and the pores were small at a low basicity.…”

Section: Resultssupporting

confidence: 91%

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Li,

Zhang,

Zhu

2024

ACS Omega

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Red mud is a solid waste containing valuable components, such as aluminum and iron. This paper aims to recover aluminum and iron from red mud by acid leaching and prepare polyaluminum ferric sulfate (PAFS) to apply for the turbidity reduction treatment of coal slurry water. The behaviors of leaching, polymerizing, and coagulation were analyzed by leaching thermodynamics and advanced micro-detection methods. More than 90% of aluminum and 60% of iron in red mud were dissolved into the leaching solution by using 50% sulfuric acid (v/v) with 7 mL/g at 100 °C for 2 h, where the crystal lattice of cancrinite was significantly destroyed to promote the dissolution of aluminum. The low polymerization (Al + Fe) a , medium polymerization (Al + Fe) b , and high polymerization (Al + Fe) c could be generated in PAFS by adjusting the basicity of the leaching solution with 0.7−0.9. The removal efficiency of turbidity of wastewater could reach more than 95% by using PAFS at 25 mg/L in the pH range of 6.0−7.0. The turbidity reduction mechanism included not only the electric neutralization of (Al + Fe) a but also the adsorption of (Al + Fe) b and the entrapment effect of (Al + Fe) c . This current study contributes to the future development of red mud based on flocculants containing aluminum and iron for wastewater treatment.

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Section: Resultssupporting

confidence: 91%

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Li,

Zhang,

Zhu

2024

ACS Omega

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“…The results show that the initial water temperature played an important role in the growth, settlement, and separation behavior of the flocs during the flocculation process. Usually, the hydrolysis rate is slow at a low temperature, the Brownian motion of the particles are weak, the time required to form flocs is increased, and the flocs formed are thin and loose so that the clarification effect is poor . However, at a high initial water temperature, flocculation was effective as the flocs were dense and easy to settle down.…”

Section: Resultsmentioning

confidence: 99%

Preparation and coagulation performance of hybrid coagulant polyacrylamide–polymeric aluminum ferric chloride

Wang

Jiang

Tan

et al. 2018

J of Applied Polymer Sci

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In this study, we synthesized a novel hybrid coagulant, polyacrylamide (PAM)-polymeric aluminum ferric chloride (PAFC), by the polymerization of acrylamide monomer with the redox system (NH 4 ) 2 S 2 O 8 -NaHSO 3 . The factors affecting the PAM-PAFC hybrid coagulant were investigated in an orthogonal experiment. The maximum intrinsic viscosity was observed at an initiator mass fraction of 0.5%, a polymerization temperature of 50 8C, a monomer mass fraction of 20%, and a polymerization time of 4 h, which were the optimum synthesis parameters. The spatial network structure of the PAM-PAFC hybrid coagulant was graphically determined by scanning electron microscopy. Hybrid PAM-PAFC was adopted to treat the kaolin-humic acid suspension and the synthetic dye wastewater. The effect of the coagulant dosage and pH on the coagulant experiments were examined. The coagulant experiment on the kaolin-humic acid suspension showed that the optimum treatment efficiency was achieved at a coagulants dosage of 0.6 mg/L, at which level the turbidity reductions with the inorganic PAFC coagulant, PAM-PAFC composite, and PAM-PAFC hybrid were 95.30%, 95.84%, and 98.38%, respectively. Treatment with the PAM-PAFC hybrid coagulant was also effective in removing Congo Red and Direct Fast Turquoise Blue GL; the color-removal efficiencies for these dyes were higher than 93% and 94%, respectively.

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“…The spectrum exhibited two characteristic bonds at 3435 and 1636 cm −1 , which could be attributed to the stretching vibration of −OH and the vibration of absorbed or complexed water in the coagulant. More importantly, a strong SiOSi peak at 1060.03 cm −1 and SiO peaks related to SiOH at 882.39 and 851.07 cm −1 clearly indicated the solubilization of SiO 2 during acid leaching . The introduction of silicic acid and corresponding hydrolytic forms via polymerization increase the molecular weight of prepared coagulant.…”

Section: Resultsmentioning

confidence: 95%

Preparation of an Aluminum and Iron‐Based Coagulant From Fly Ash for Industrial Wastewater Treatment

Zhao

Chen

et al. 2017

CLEAN Soil Air Water

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Fly ash was investigated to produce a composite coagulant containing aluminum (Al) and iron (Fe) salts through the calcination and leaching processes. The extraction of Al and Fe oxides from fly ash demonstrated similar results for HCl and H2SO4 leaching. Besides, the calcination pretreatment of fly ash (without any additive) was found to be less effective in extraction. However, the conversion efficiencies of Al and Fe were affected greatly by calcination pretreatment with addition of Na2CO3, and leaching conditions of ratio of solution to fly ash (L/S) and H+ concentration. The maximum concentrations of Al and Fe solubilized from fly ash were 0.21 and 0.04 mol/L, respectively, which were attained by calcination pretreatment using an optimal mass ratio (ca. 1:16.7) of Na2CO3 to fly ash at 805°C. These concentrations correspond to conversion efficiencies of 31.2% for Fe and 18.3% for Al in the fly ash. The slurry was filtrated to obtain a solution containing Al‐ and Fe‐sulfates and silicates. The Al/Fe/Si mole ratio indicated the feasibility of further production of inorganic polymer coagulant. The produced coagulant was determined to be effective for treating soybean wastewater and dairy wastewater in terms of COD and SS removal.

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Study on structural characterization and algae-removing efficiency of polymeric aluminum ferric sulfate (PAFS)

Cited by 11 publications

References 23 publications

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Preparation and coagulation performance of hybrid coagulant polyacrylamide–polymeric aluminum ferric chloride

Preparation of an Aluminum and Iron‐Based Coagulant From Fly Ash for Industrial Wastewater Treatment

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