Spectroscopic characterization of the structural and functional properties of natural organic matter fractions

Chen, Jie; Gu, Baohua; LeBoeuf, Eugene J.; Pan, Hongjun; Dai, Sheng

doi:10.1016/s0045-6535(02)00041-3

Cited by 663 publications

(366 citation statements)

References 45 publications

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“…There was also no peak shift for the influent and effluent of membrane tanks in the two systems, which meant that the components were relatively consistent. A blue shift is ascribed to the elimination of particular functional groups such as carbonyl, hydroxyl and amine, a reduction in the degree of p-electron systems [48], and the decrease in the number of aromatic rings and conjugated bonds in chain structures [49]. This difference between the two UF systems was a consequence of the removal of different fractions of the humic-like substances in the raw water during the coagulation and adsorption processes.…”

Section: Variation Of Dissolved Organic Matter (Dom) In the Watermentioning

confidence: 99%

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

et al. 2014

Journal of Membrane Science

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a b s t r a c tPre-coagulation by alum before ultrafiltration without (CUF) and with (CAUF) powdered activated carbon (PAC) addition was investigated to explore the influence of PAC on membrane fouling. It was found that the continuous addition of a low dosage of PAC reduced membrane fouling for operational run periods o20 days, both for reversible and for irreversible components of fouling. The presence of PAC increased the removal of dissolved organic matter (DOM), particularly proteinaceous substances, and some fractions of humic-type substances. For a longer operation time (420 days) an increase in mainly reversible fouling was evident and was attributed to microorganism growth in the cake layer, as indicated by the enhanced concentrations of extracellular polymeric substances, such as polysaccharides and proteins. A process of crystallization of the coagulant floc in the cake layer with increasing operation time was believed to cause desorption of DOM from primary coagulation particles and a decrease in their size, and consequently a higher density of cake layer. PAC absorption of desorbed DOM within the cake layer, and residual DOM after coagulation, reduced DOM reaching the membrane surface and the extent of subsequent internal membrane fouling.Crown

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Section: Variation Of Dissolved Organic Matter (Dom) In the Watermentioning

confidence: 99%

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

et al. 2014

Journal of Membrane Science

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“…Natural organic matter (NOM) with its main components of humic acid (HA) and fulvic acid (FA) can be found most commonly in soil, natural water, and sediments which consisted of a mixture of the decomposition products of plant and animal residues [1,2]. The presence of NOM in raw water could considerably affect the water quality during the water purification process.…”

Section: Introductionmentioning

confidence: 99%

Optimising photoelectrocatalytic oxidation of fulvic acid using response surface methodology

Zhao

2007

Journal of Hazardous Materials

134

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Publication informationJournal of Hazardous Materials, 144 (1-2): 499-505 Publisher ElsevierLink to online version http://dx.doi.org/10.1016/j.jhazmat.2006.10.071Item record/more information http://hdl.handle.net/10197/3175 Publisher's statement þÿ T h i s i s t h e a u t h o r s v e r s i o n o f a w o r k t h a t w a s a c c e p t e d f o r p u b l i c a t i o n i n J o u r n a l o fHazardous Materials. Changes resulting from the publishing process, such as peer review, Abstract: In this paper, statistics-based experimental design with response surface methodology (RSM) was employed to investigate the effect of operation conditions on photoelectrocatalytic oxidation of fulvic acid (FA) using a Ti/TiO 2 electrode in a photoreactor. Initially, the Box-Behnken design was employed including the three key variables (initial pH, potassium peroxodisulphate (K 2 S 2 O 8 ) and bias potential). Thereafter, the mutual interaction and effects between these parameters and optimum conditions were obtained in greater detail by means of SAS and Matlab software. The results of this investigation reveal that: (1) the regression analysis with R 2 value of 0.9754 shows a close fit between the experimental results and the model predictions; (2) three-dimension response surface plot can provide a good manner for visualizing the parameter interactions; and (3) the optimum pH, K 2 S 2 O 8 and bias potential is found to be 3.8, 88.40mg/L, 0.88V respectively and the highest FA removal efficiency of 57.1% can be achieved.

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“…From a chemical point of view, humic substances can be described generally as a concentration of aromatic and aliphatic rings, aliphatic chains, bridges, and numerous functional groups. Among the most important functional groups of humus compounds are carboxyl, hydroxyl, phenolic, methoxy, and carbonyl groups (Stevenson 1994;Chen et al 2002;Tipping 2002;Tan 2003).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Huculak-Mączka

Hoffmann

2018

J Soils Sediments

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Purpose Technological progress and high market demand contributed to a significant interest in the production of fertilizers based on humic acids. The aim of this study was to evaluate the possibilities of using humic acids obtained from lignite in the production of new commercial products. For this purpose, it is necessary to determine the quality standard requirements for such material. Properties of humic acids depend on source of origin as well as method of its extraction. Materials and methods The humic acids were extracted from polish deposit of lignite-Sieniawa Lubuska by alkaline extraction using for this purpose six kinds of extractants: 0.1 M NaOH and 0.25 M NaOH, 0.1 M KOH and 0.25 M KOH, and 0.1 M Na 4 P 2 O 7 and 0.25 M Na 4 P 2 O 7 . The humic samples were used in solid powder form and characterized by UV-Vis spectroscopy, 13 C NMR spectroscopy, fluorescence spectroscopy, and thermal analysis. Results and discussion The determining factor influencing a degree of humic acids extraction from lignite and their structure is type of extractant. The largest efficiency of extraction (about 50%) was obtained with the use of NaOH solutions. All examined humic acids were generally characterized by simple and heterogeneous molecularly structure with low molecular weight and low aromatic polycondensation. Therefore, it can be concluded that humic acids extracted with NaOH and KOH solutions are less condensed than those extracted with Na 4 P 2 O 7 solutions. It can suggest that humic acids obtained from lignite using solutions of Na 4 P 2 O 7 are characterized by a low transformation degree and greater amount of carboxyl groups. Conclusions Low rank coal can be successfully used in agriculture as a rich source of humic acids. Reagent used in their extraction, apart from high efficiency should have a neutral impact on their structure. Studies on the physicochemical properties of humic acids can be helpful in predicting behaviors of such fertilizer components in the environment and in inventing new products taking the principles of sustainable development into consideration.

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Spectroscopic characterization of the structural and functional properties of natural organic matter fractions

Cited by 663 publications

References 45 publications

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

Optimising photoelectrocatalytic oxidation of fulvic acid using response surface methodology

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

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