Al(III) speciation distribution and transformation in high concentration PACl solutions

Huang, Li; Tang, Hongxiao; Wang, Dongsheng; Wang, Shuifeng; Deng, Zai-jun

doi:10.1016/s1001-0742(06)60007-7

Cited by 17 publications

(5 citation statements)

References 21 publications

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“…Based on dissociation and complex reaction kinetic rates between ferron reagent and hydrolyzed Al species (Chen et al, 2006;Huang et al, 2006a;Wang et al, 2005), the hydrolyzed Al species were divided into monomeric species (Al a ) (reacting with ferron from 0 to 1 min), planar oligomeric and medium polymeric species (Al b ) (reacting with ferron from 1 to 120 min), and three dimensional species or sol-gels (Al c ) (reacting with ferron after 120 min and non-reacting with ferron). The Al T concentration was measured based on titrimetric method (Chen et al, 2006;Guo et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

“…It has been generally demonstrated that Al 13 or Al b is regarded as the active species responsible for coagulation or precipitation (Bottero et al, 1988;Gao et al, 2005;Hu et al, 2005;Huang et al, 2006b;Qian et al, 2008;Wang and Hsu, 1994). As we know, high Al b content more than 70% is found stable at total Al concentration (Al T ) below 0.5 mol/L; but the content of Al b would be less than 30% with Al T above 2 mol/L (Huang et al, 2006a;Xu et al, 2003). Therefore, how to prepare the high concentration PACl with high Al b content has become the primary goal for the research and production industry of PACl.…”

Section: Introductionmentioning

confidence: 99%

“…Previous reports on hydrolysis process mainly focused on PACl solutions of low concentration (10 −4 -10 −1 mol/L), and few concerned with the high concentration above 2 mol/L. Huang et al (2006a) investigated Al species distribution and transformation at high PACl concentration at 2 mol/L, but the content of Al b was lower than 18.3%.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of high concentration polyaluminum chloride with high content of Alb or Alc

Zhao¹,

Zhang²,

Luan³

et al. 2009

Journal of Environmental Sciences

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A novel membrane distillation concentration method was used to prepare high concentration polyaluminum chloride (PACl) with high content of Al b or Al c . 2.52 mol/L PACl 1 with 88% Al b and 2.38 mol/L PACl 2 with 61% Al c were successfully prepared. Three coagulants, AlCl 3 , PACl 1 and PACl 2 were investigated on their hydrolysis behavior and speciation under different conditions. The effects of pH and dilution ratio on Al species distribution were investigated by ferron assay. Experimental result showed that pH had a significant effect on Al species distribution for the three coagulants. Dilution ratio had little effects on Al b and Al c distribution in whole dilution process except the beginning for PACl 1 and PACl 2 . The results indicated that transformation of Al depends largely on their original composition. AlCl 3 was the most unstable coagulant among these three coagulants during hydrolysis process. PACl 1 and PACl 2 with significant amounts of highly charged and stable polynuclear aluminum hydrolysis products were less affected by the hydrolysis conditions and could maintain high speciation stability under various conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of high concentration polyaluminum chloride with high content of Alb or Alc

Zhao¹,

Zhang²,

Luan³

et al. 2009

Journal of Environmental Sciences

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“…The relative stability of different polyaluminum complexes is highly sensitive to the Al(III) concentration and pH. The influence of these variables on the speciation of Al compounds in an aqueous environment has been previously studied by means of electrospray ionization mass spectrometry (ESI-MS), − solid-state Al-nuclear magnetic resonance (NMR) spectroscopy, , wet scanning electron microscopy (WSEM), tapping-mode atomic force microscopy, and computational chemistry techniques. − …”

Section: Introductionmentioning

confidence: 99%

Isomerism of Trimeric Aluminum Complexes in Aqueous Environments: Exploration via DFT-Based Metadynamics Simulation

et al. 2016

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The chemistry of aluminum or oxo-aluminum in water is still relatively unknown, although it is the basis for many chemical and industrial processes, including flocculation in water treatment plants. Trimeric species have a predominant role in the formation of the Keggin cations, which are the basic building blocks of aluminum-based chemicals. Despite this, details of the structural evolution of these small solvated clusters and how this is related to the processes leading to the formation of larger aggregates are still an open issue. To address these questions, here, we have applied the metadynamics (MTD) simulation technique [ Barducci , A. ; Wiley Interdiscip. Rev.: Comput. Mol. Sci. 2010 , 1 , 826 - 843 ] with density functional theory-based molecular dynamics to disclose the dynamics and structural conversions of trimeric aluminum complexes in an aqueous environment. The existence of a variety of competing metastable conformations, for example, book-like, cyclic boat, and linear shape conformations, is revealed in the MTD simulation. Furthermore, equilibrium simulations of the various intermediate states encountered along the MTD trajectory are used to assess their (meta)stability, determine the rearrangement of the OH ligands, and discuss the role of the solvating water.

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“…Meanwhile IPFs have some disadvantages such as more coagulant dosage and slower flocculation rate. While OPFs can overcome aforesaid drawbacks, for it less affected by concomitant salts, pH values and temperature, and it has a wide range of application water, better water treatment efficiency, less sludge yield [1]. However, some OPFs can generate toxic degradation products and can only be used to treat industrial wastewater rather than drinking water.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a New Inorganic-Organic Composite Dual-Coagulant and Application of Oily Wastewater Treatment

Jiang

et al. 2011

AMR

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A new inorganic-organic composite dual-coagulant (PAFC-CPAM) was prepared by polyaluminum ferric chloride (PAFC) and cationic polyacrylamide (CPAM) and its treatment efficiency for oily wastewater was evaluated by coagulation jar tests. PAFC-CPAM dual-coagulants were characterized by FT-infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The FTIR spectra illustrated that there were some chemical reactions between PAFC and CPAM in PAFC-CPAM. SEM micrographs testified that PAFC-CPAM formed compact net structure which is different from PAFC and CPAM, resulting to its outstanding coagulation performance other than monomeric coagulant in treating oily wastewater. Coagulation jar tests presented that PAFC-CPAM improved 1.14% and 0.38% of oil removal rate and reduced 0.35NTU and 0.06NTU of residual turbidity than PAFC and CPAM respectively at the optimal dosage of 120mg/L. PAFC-CPAM enhanced 4.56% and 2.12% of oil removal efficiency and decreased 0.27NTU and 0.01NTU of residual turbidity on average in comparison with PAFC and CPAM respectively in the pH range of 4.0-8.0. All of above-mentioned experiment results demonstrated that PAFC-CPAM behaved superior coagulation performance than PAFC and CPAM.

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Al(III) speciation distribution and transformation in high concentration PACl solutions

Cited by 17 publications

References 21 publications

Preparation of high concentration polyaluminum chloride with high content of Alb or Alc

Preparation of high concentration polyaluminum chloride with high content of Alb or Alc

Isomerism of Trimeric Aluminum Complexes in Aqueous Environments: Exploration via DFT-Based Metadynamics Simulation

Preparation of a New Inorganic-Organic Composite Dual-Coagulant and Application of Oily Wastewater Treatment

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