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Papers by Daniele Manholer

Journal of the Taiwan Institute of Chemical Engineers, 2016

Abstract The goal of this study was to investigate the application of mucilage extracted from the... more Abstract The goal of this study was to investigate the application of mucilage extracted from the cereus peruvianus cactus for the optimization of the treatment of actual textile effluents by the coagulation/flocculation technique. The cactus active component obtained by saline extraction gave maximum turbidity removal from standard effluent with a kaolinite turbidity of 95%. The effects of time and storage temperature conditions were investigated and the coagulant activity was found to vary only for the in natura sample after 4 days of storage at room temperature. The textile effluent treatment optimization process was optimized using the response-based Box–Behnken experimental design for the variables coagulant dosage (FeCl 3 ), coagulant adjuvant ( Cereus peruvianus ) dosage and pH. A quadratic regression model was calculated using the percent COD removal response and the percent removal of turbidity.

Química Nova, 2015

Chemical investigation of Guettarda viburnoides (leaves) led to the isolation of ursolic acid, un... more Chemical investigation of Guettarda viburnoides (leaves) led to the isolation of ursolic acid, uncaric acid, secoxyloganin, and grandifloroside, along with a mixture of quercetin-3-O-β-D-galactopyranoside and quercetin-3-O-β-D-glucopyranoside, and of β-sitosterol and stigmasterol. The structures of the isolated compounds were elucidated on the basis of their NMR data. The crude extract, ethyl acetate fraction, aqueous-methanol fraction, and grandifloroside showed significant DPPH free-radical scavenging activities with IC 50 ranging from 18.92 to 26.47 mg mL −1. The topical administration of the crude extract and fractions markedly reduced the croton oil-induced mice ear edema in 67.0%-99.0%. Inhibition of tissue MPO activity was also observed, which demonstrated an anti-inflammatory effect of the G. viburnoides species.

Textile Science and Clothing Technology

With the increased demand for textile products, the textile industry and its wastewaters have bee... more With the increased demand for textile products, the textile industry and its wastewaters have been increasing proportionally, making it one of the main sources of severe pollution problems worldwide. Textile wastewater treatment is one the most difficult environmental problems because it contains high color, biochemical oxygen demand (BOD), chemical oxygen demand (COD), pH, temperature, turbidity and toxic chemicals. The direct discharge of this wastewater without previous or proper treatment into the water bodies, like lakes, rivers, etc. pollutes the water affecting directly and indirectly the water. Coagulation/flocculation is one of the most widely used for wastewater treatment, as it is efficient and simple to operate. This process is used for the removal of suspended and dissolved solids, colloids and organic matter present in industrial wastewater. Natural coagulants have been attracting wide interest of researchers because they have the advantages of biodegradability, safe for human health, environmental friendly, generally toxic free and produce no secondary pollution. These coagulants are extracted from natural and renewable sources, such as microorganisms, animals or plants. Not only this, the sludge volume generated by the natural coagulants is smaller than chemical coagulants; it can further be treated biologically or can be disposed safely as soil conditioners because of their non-toxicity. The raw plant extracts are often available locally and hence, a low-cost alternative to chemical coagulants. In recent years, numerous studies on natural coagulants are growing and there is an urgent need to establish the use of natural low-cost coagulants for textile wastewater treatment. In this chapter, we show the characteristics of dyes and textile wastewater, emphasizing adverse impacts on environmental and human health and we mentioned some technologies for the textile wastewater treatment, highlighting the CF, since it is efficient, is easy to operate and is commonly used at the industries. We also have been discussed the physical-chemical concept of CF as well the major mechanisms involved at process. The usage of plant-based natural coagulants as alternative to chemical coagulants in the textile wastewater treatment is the goal of this chapter.

The aim of this study was to assess the efficiency of mucilage extracted from the fruit of Dillen... more The aim of this study was to assess the efficiency of mucilage extracted from the fruit of Dillenia indica at benefiting coagulation for the treatment of textile effluent. The mucilage extraction was carried out in water at room temperature with optimization of factors of pH, concentration of coagulant FeCl3.6H2O, and concentration of mucilage solution through the planning of the star-type central compound. We were able to analyze the synergistic effects between the FeCl3.6H2O mucilage concentrations in which the process of coagulation\flocculation (CF) for the removal of the chemical oxygen demand (COD) is more significant at a low chemical coagulant concentration (8.00 mg L−1) and a higher natural coagulant concentration (NC) (15.00 mg L−1) demonstrating the potential of this mucilage to treat textile effluents with a COD removal of 67.66%%, 96.86% of turbidity removal and reduced 91,12% of apparent color. The characterization of the mucilage of Dillenia indica was done through Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance of 13C in the solid state (13C NMR), where the signals obtained indicate the presence of polysaccharides, which are responsible for accentuating the CF process.

Journal of Water Process Engineering

Helvetica Chimica Acta, 2008

Phytochemical investigation from the stems of Alibertia edulis led to the isolation and identific... more Phytochemical investigation from the stems of Alibertia edulis led to the isolation and identification of a new iridoid 6β-hydroxy-7-epigardoside methyl ester (1) and a new saponin 3β-O-[α-L-rhamnopyranosyl-(1→2)-O-β-D-glucopyranosyl-(1→2)-O-β-D-glucopyranosyl]-28-O-β-D-glucopyranoside pomolate (2), along with three known compounds, shanzhiside methyl ester (3), ixoside (4), and 3,4,5-trimethoxyphenyl 1-O-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside (5). The structures of 1 and 2 were established on the basis of their spectroscopic data. Iridoid 1 and saponin 2 exhibited moderate inhibitory activities against Candida albicans and C. krusei in a dilution assay.

Journal of the Taiwan Institute of Chemical Engineers, 2016

Abstract The goal of this study was to investigate the application of mucilage extracted from the... more Abstract The goal of this study was to investigate the application of mucilage extracted from the cereus peruvianus cactus for the optimization of the treatment of actual textile effluents by the coagulation/flocculation technique. The cactus active component obtained by saline extraction gave maximum turbidity removal from standard effluent with a kaolinite turbidity of 95%. The effects of time and storage temperature conditions were investigated and the coagulant activity was found to vary only for the in natura sample after 4 days of storage at room temperature. The textile effluent treatment optimization process was optimized using the response-based Box–Behnken experimental design for the variables coagulant dosage (FeCl 3 ), coagulant adjuvant ( Cereus peruvianus ) dosage and pH. A quadratic regression model was calculated using the percent COD removal response and the percent removal of turbidity.

Química Nova, 2015

Chemical investigation of Guettarda viburnoides (leaves) led to the isolation of ursolic acid, un... more Chemical investigation of Guettarda viburnoides (leaves) led to the isolation of ursolic acid, uncaric acid, secoxyloganin, and grandifloroside, along with a mixture of quercetin-3-O-β-D-galactopyranoside and quercetin-3-O-β-D-glucopyranoside, and of β-sitosterol and stigmasterol. The structures of the isolated compounds were elucidated on the basis of their NMR data. The crude extract, ethyl acetate fraction, aqueous-methanol fraction, and grandifloroside showed significant DPPH free-radical scavenging activities with IC 50 ranging from 18.92 to 26.47 mg mL −1. The topical administration of the crude extract and fractions markedly reduced the croton oil-induced mice ear edema in 67.0%-99.0%. Inhibition of tissue MPO activity was also observed, which demonstrated an anti-inflammatory effect of the G. viburnoides species.

Textile Science and Clothing Technology

With the increased demand for textile products, the textile industry and its wastewaters have bee... more With the increased demand for textile products, the textile industry and its wastewaters have been increasing proportionally, making it one of the main sources of severe pollution problems worldwide. Textile wastewater treatment is one the most difficult environmental problems because it contains high color, biochemical oxygen demand (BOD), chemical oxygen demand (COD), pH, temperature, turbidity and toxic chemicals. The direct discharge of this wastewater without previous or proper treatment into the water bodies, like lakes, rivers, etc. pollutes the water affecting directly and indirectly the water. Coagulation/flocculation is one of the most widely used for wastewater treatment, as it is efficient and simple to operate. This process is used for the removal of suspended and dissolved solids, colloids and organic matter present in industrial wastewater. Natural coagulants have been attracting wide interest of researchers because they have the advantages of biodegradability, safe for human health, environmental friendly, generally toxic free and produce no secondary pollution. These coagulants are extracted from natural and renewable sources, such as microorganisms, animals or plants. Not only this, the sludge volume generated by the natural coagulants is smaller than chemical coagulants; it can further be treated biologically or can be disposed safely as soil conditioners because of their non-toxicity. The raw plant extracts are often available locally and hence, a low-cost alternative to chemical coagulants. In recent years, numerous studies on natural coagulants are growing and there is an urgent need to establish the use of natural low-cost coagulants for textile wastewater treatment. In this chapter, we show the characteristics of dyes and textile wastewater, emphasizing adverse impacts on environmental and human health and we mentioned some technologies for the textile wastewater treatment, highlighting the CF, since it is efficient, is easy to operate and is commonly used at the industries. We also have been discussed the physical-chemical concept of CF as well the major mechanisms involved at process. The usage of plant-based natural coagulants as alternative to chemical coagulants in the textile wastewater treatment is the goal of this chapter.

The aim of this study was to assess the efficiency of mucilage extracted from the fruit of Dillen... more The aim of this study was to assess the efficiency of mucilage extracted from the fruit of Dillenia indica at benefiting coagulation for the treatment of textile effluent. The mucilage extraction was carried out in water at room temperature with optimization of factors of pH, concentration of coagulant FeCl3.6H2O, and concentration of mucilage solution through the planning of the star-type central compound. We were able to analyze the synergistic effects between the FeCl3.6H2O mucilage concentrations in which the process of coagulation\flocculation (CF) for the removal of the chemical oxygen demand (COD) is more significant at a low chemical coagulant concentration (8.00 mg L−1) and a higher natural coagulant concentration (NC) (15.00 mg L−1) demonstrating the potential of this mucilage to treat textile effluents with a COD removal of 67.66%%, 96.86% of turbidity removal and reduced 91,12% of apparent color. The characterization of the mucilage of Dillenia indica was done through Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance of 13C in the solid state (13C NMR), where the signals obtained indicate the presence of polysaccharides, which are responsible for accentuating the CF process.

Journal of Water Process Engineering

Helvetica Chimica Acta, 2008

Phytochemical investigation from the stems of Alibertia edulis led to the isolation and identific... more Phytochemical investigation from the stems of Alibertia edulis led to the isolation and identification of a new iridoid 6β-hydroxy-7-epigardoside methyl ester (1) and a new saponin 3β-O-[α-L-rhamnopyranosyl-(1→2)-O-β-D-glucopyranosyl-(1→2)-O-β-D-glucopyranosyl]-28-O-β-D-glucopyranoside pomolate (2), along with three known compounds, shanzhiside methyl ester (3), ixoside (4), and 3,4,5-trimethoxyphenyl 1-O-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside (5). The structures of 1 and 2 were established on the basis of their spectroscopic data. Iridoid 1 and saponin 2 exhibited moderate inhibitory activities against Candida albicans and C. krusei in a dilution assay.