scholarly journals Valorization of the use of Waste Agricultural Materials for the Anodic Oxidation of Amaranth Red (E123) using SS/PbO2 Anodes Elaborated by Pulsed Mode Current

2021 ◽  
Author(s):  
Amina Othmani
Keyword(s):  
Organic Carbon ◽  
Anodic Oxidation ◽  
Agricultural Waste ◽  
Polluted Water ◽  
Total Removal ◽  
Coupling Process ◽  
Effects Of Ph ◽  
Time Required ◽  
Agricultural Materials ◽  
Phytotoxicity Tests

Abstract The present paper aims to valorize the use of cheap agricultural waste materials for polluted water decontamination. An evaluation of the efficiency of coupling anodic oxidation (AO) using SS/PbO 2 electrodes with biosorption by Luffa cylindrica (L.C) for the removal of Amaranth Red (E123) from aqueous solution was investigated. The effects of pH, contact time, and initial concentration were studied. The regeneration of L.C was estimated based on biosorption /desorption tests. The performance of the coupling process was evaluated based on the color, chemical organic carbon (COD), Total organic carbon (TOC) removals, the energy consumed, and the time required for the degradation of Amaranth. A comparison between the efficiency of the AO and the coupling process for the increase of the lifetimes of the anodes used was done. 54.1, 97.8, and 99.9% of 50 mg.L -1 of Amaranth were removed respectively after 85, 65, and 50 min by biosorption, AO, and coupling AO with biosorption. An increase in the percentages of COD, TOC, germination indexes (GI), and Amaranth removals were observed when adopting the coupling process. Furthermore, a decrease in the release of Pb 2+ ions was observed confirming the good stability of the elaborated anodes during the coupling process. Atomic absorption analysis showed that the Pb 2+ ions reached about 0.020 mg.L -1 , after the total removal of Amaranth dye (60 min) and 0.051 after (80 min) respectively, for coupling AO with biosorption and the AO process. These values are inferior to those allowed by the Standards. Phytotoxicity tests confirmed the possibility of the reuse of the treated solutions.

Removal of Inorganic Contaminants Using Manufacturing Porous Media

2018 ◽  
Vol 7 (4.20) ◽  
pp. 142 ◽  
Author(s):  
Sadiq Salman Muhsun ◽  
Karim Rashid Gubashi ◽  
Rawaa Fahim Chyad ◽  
Zainab T. Al-Sharify
Keyword(s):  
Heavy Metals ◽  
Porous Media ◽  
Organic Carbon ◽  
Removal Efficiency ◽  
Continuous Flow ◽  
Flow System ◽  
Polluted Water ◽  
Inorganic Contaminants ◽  
Flow Discharge ◽  
Detention Time

The objective of the experimental work performed in this study is to analyze the adsorption of the total organic carbon from aqueous solutions using a manufacturing porous media of Activated Ceramic (ACR) in a continuous flow system, consisting of horizontal PVC pipes of 150 mm diameter and 6 m length without membranes. The discharge of the polluted water in the system was varied at values of 10, 20, 40, 60, 80 and 100 L/hr while the contaminants were changed in concentrations of high and low with the measurement of pressure. The results show that in order to increase the removal efficiency of heavy metals, the detention time and the length of the pipe must be increased. The decrease in flow discharge results in an increase in the removal efficiency of the heavy metals while the results for the removal process of the ACR media were: Mn+2> Cr+3 > Fe+2 > Cu+2 > Zn+2.  

Potential of Agricultural Waste Material (Ananas cosmos) as Biosorbent for Heavy Metal Removal in Polluted Water

2020 ◽  
Vol 1010 ◽  
pp. 489-494
Author(s):  
Abdul Hafidz Yusoff ◽  
Rosmawani Mohammad ◽  
Mardawani Mohamad ◽  
Ahmad Ziad Sulaiman ◽  
Nurul Akmar Che Zaudin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Adsorption Capacity ◽  
Metal Removal ◽  
Low Cost ◽  
Agricultural Waste ◽  
Heavy Metal Removal ◽  
Polluted Water ◽  
Maximum Adsorption Capacity ◽  
Pineapple Peel

Conventional methods to remove heavy metals from polluted water are expensive and not environmentally friendly. Therefore, this study was carried out to investigate the potential of agricultural waste such as pineapple peel (Ananas Cosmos) as low-cost absorbent to remove heavy metals from synthetic polluted water. The results showed that Cd, Cr and Pb were effectively removed by the biosorbent at 12g of pineapple peels in 100 mL solution. The optimum contact time for maximum adsorption was found to be 90 minutes, while the optimum pH for the heavy metal’s adsorption was 9. It was demonstrated that with the increase of adsorbent dosage, the percent of heavy metals removal was also increased due to the increasing adsorption capacity of the adsorbent. In addition, Langmuir model show maximum adsorption capacity of Cd is 1.91 mg/g. As conclusions, our findings show that pineapple peel has potential to remove heavy metal from polluted water.

scholarly journals Effect of biomass burning over the western North Pacific Rim: wintertime maxima of anhydrosugars in ambient aerosols from Okinawa

2015 ◽  
Vol 15 (4) ◽  
pp. 1959-1973 ◽  
Author(s):  
C. Zhu ◽  
K. Kawamura ◽  
B. Kunwar
Keyword(s):  
Organic Carbon ◽  
Biomass Burning ◽  
Atmospheric Aerosols ◽  
North Pacific ◽  
Western North Pacific ◽  
Agricultural Waste ◽  
Northern China ◽  
Water Soluble ◽  
Pacific Rim ◽  
Okinawa Island

Abstract. Biomass burning (BB) largely modifies the chemical composition of atmospheric aerosols on the globe. We collected aerosol samples (TSP) at Cape Hedo, on subtropical Okinawa Island, from October 2009 to February 2012 to study anhydrosugars as BB tracers. Levoglucosan was detected as the dominant anhydrosugar followed by its isomers, mannosan and galactosan. We found a clear seasonal trend of levoglucosan and mannosan with winter maxima and summer minima. Positive correlation was found between levoglucosan and nss-K+ (r = 0.38, p < 0.001); the latter is another BB tracer. The analyses of air mass trajectories and fire spots demonstrated that the seasonal variations of anhydrosugars are caused by long-range transport of BB emissions from the Asian continent. We found winter maxima of anhydrosugars, which may be associated with open burning and domestic heating and cooking in northern and northeastern China, Mongolia and Russia and with the enhanced westerly winds. The monthly averaged levoglucosan / mannosan ratios were lower (2.1–4.8) in May–June and higher (13.3–13.9) in November–December. The lower values may be associated with softwood burning in northern China, Korea and southwestern Japan whereas the higher values are probably caused by agricultural waste burning of maize straw in the North China Plain. Anhydrosugars comprised 0.22% of water-soluble organic carbon (WSOC) and 0.13% of organic carbon (OC). The highest values to WSOC (0.37%) and OC (0.25%) were found in winter, again indicating an important BB contribution to Okinawa aerosols in winter. This study provides useful information to better understand the effect of East Asian biomass burning on the air quality in the western North Pacific Rim.

scholarly journals Mesoporous Spongy Ni-Co-Oxides@Wheat Straw-Derived SiO2 For Adsorption And Photocatalytic Degradation of Methylene Blue Pollutants

2021 ◽  
Author(s):  
Mohamed A. T. Hussein ◽  
Mohamed M Motawea ◽  
Mohamed M. Elsenety ◽  
Salah M. El-Bahy ◽  
Hassanien Gomaa
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Wheat Straw ◽  
Agricultural Waste ◽  
Nitrogen Adsorption ◽  
Cost Effective ◽  
Polluted Water ◽  
Isotherm Models ◽  
Cobalt Oxides ◽  
Computational Calculations

Abstract The exploitation and employment of agricultural waste in polluted water treatment is one of the most important cost-effective approaches. Therefore, a novel mesoporous spongy adsorbent/photocatalyst was successfully synthesized through the grafting of nickel and cobalt oxides nanocomposites with wheat straw-derived SiO2. Nickel and cobalt oxides were added to enhance the functionality of wheat straw-derived SiO2. This synthesis methodology presents a simplistic, cost-effective, and eco-approachable alternative to getting an adsorbent and photocatalyst for the adsorption and photocatalytic degradation of methylene blue (MB) pollutants from wastewater. The modified wheat straw-derived SiO2 (MWSS) was characterized via XRD, SEM, EDX, TGA, FTIR, and nitrogen adsorption. Molecular dynamics computational calculations were performed to comprehend the ability of methylene blue to adjust the WSDS surface. The experiments of adsorption and photodegradation trials were performed to optimize the pH, contact time, initial MB-concentration, and temperature parameters. Furthermore, kinetics and isotherm models were checked to explain the MB-removal mechanism using mesoporous spongy MWSS. The current work indicated that the mesoporous MWSS adsorbent/photocatalyst provided efficient adsorption capability (79%), significant photocatalytic performance (93%), and higher solidity during reusability as well. This study suggests an efficient composite that contributes to getting rid of the MB pollutants from wastewater.

scholarly journals SORÇÃO DO HERBICIDA 2,4-D EM SOLOS BRASILEIROS

2003 ◽  
Vol 13 ◽  
Author(s):  
CLAUDIO A. SPADOTTO ◽  
MARCUS B. MATALLO ◽  
MARCO ANTONIO F. GOMES
Keyword(s):  
Organic Carbon ◽  
High Performance ◽  
Ph Dependence ◽  
Soil Samples ◽  
Organic Carbon Content ◽  
Sorption Coefficient ◽  
Brazilian Soils ◽  
Effects Of Ph ◽  
Acidic Pesticides ◽  
Acid Compound

Neste trabalho procurou-se gerar e discutir dados sobre sorção de pesticidas ácidos em solos brasileiros, considerando sua dependência do pH. Amostras de solos foram coletadas em diferentes regiões do Brasil e suas propriedades determinadas (% de argila, % de CO e pH). Valores do coeficiente de sorção do herbicida 2,4-D foram determinados em laboratório usando teste em equilíbrio padrão e cromatografia a líquido de alta eficiência (CLAE). O coeficiente de sorção (Kd) foi estimado e o coeficiente de sorção normalizado pela fração de carbono orgânico do solo (Koc) calculado para cada solo. Os resultados de Koc variaram entre 21,3 e 306,5 mL/g, sendo que dados de Koc encontrados na literatura internacional estão entre 20 e 60 mL/g. Observou-se tendência de aumento dos valores de Kd em solos com maiores teores de carbono orgânico. No entanto, houve grande variação nos valores de Koc entre solos da mesma classe. Adicionalmente, os efeitos do pH na sorção do 2,4-D foram estudados em Latossolo. Os valores de Kd e Koc diminuíram com o aumento do pH. A sorção do 2,4-D, como composto ácido, é principalmente determinada pela sua dissociação. Entretanto, a dissociação do 2,4-D pode não ser suficiente para explicar a variação em Kd (ou Koc) em função do pH. Parece que a sorção das formas aniônicas de pesticidas ácidos tem sido superestimada e o efeito da dissociação da matéria orgânica, com mudanças no pH do solo, tem sido subestimada. SORPTION OF 2,4-D HERBICIDES IN BRAZILIAN SOILS Abstract This work aimed to generate and discuss data on acid pesticides sorption in Brazilian soils, taking into account the pH dependence. Soil samples were collected in different regions of Brazil and their properties were determined (% argila, % CO and pH. Sorption coefficient of 2,4-D were measured by means of a standard batch equilibrium method and high performance liquid chromatography (HPLC) analysis. The sorption coefficient (Kd) was estimated, and the organic carbon normalized sorption coefficient (Koc) was calculated for each soil. The Koc results are between 21.3 and 306.5 mL/g, while the Koc values from international literature are in the 20 to 60 mL/g range. The Koc values tend to increase in soils with large organic carbon content. However, great Koc values variation occurred among soils in the same class. Additionally, the effects of pH in 2,4-D sorption were studied in a Brazilian Oxisol. The Kd and Koc values decreased with pH increasing. Sorption of 2,4-D, as an acid compound, is mainly driven by its dissociation. However 2,4-D dissociation is not enough to explain the variation in Kd (or Koc) as a function of pH. In general, anionic-form sorption of acidic pesticides has been overvalued; on the other hand, the overall effect of organic matter dissociation owing to pH changes has been overlooked.

scholarly journals Removal of Azo Dyes (Violet B and Violet 5R) from Aqueous Solution Using New Activated Carbon Developed from Orange Peel

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Saeedeh Hashemian ◽  
Khaterah Salari ◽  
Hamila Salehifar ◽  
Zahra Atashi Yazdi
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Organic Dyes ◽  
Agricultural Waste ◽  
Orange Peel ◽  
Polluted Water ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Freundlich Isotherms ◽  
Order Kinetic Model

Activated carbon developed from agricultural waste orange peel (COP) was prepared. COP was characterized using Fourier infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and BET. COP has surface area and mean pore diameter of 225.6 m2 g−1and 22.40 nm, respectively. The removal of violet B (VB) and violet 5R (V5R) from aqueous solutions by COP was investigated. The effect of operational parameters such as contact time, pH, initial dye concentration, and adsorbent dosage on the adsorption of dyes was investigated. Maximum dye was removed within 30 min of contact time at pH > 7. Two common models, the Langmuir and Freundlich isotherms, were used to investigate the interaction of dye and COPs. The isotherm evaluations revealed that the Langmuir model provides better fit to the experimental data than the Freundlich model. The adsorption of VB and V5R onto COP was followed by pseudo-second-order kinetic model with a good correlation (R2>0.99). Activation energies 5.47 and 29.7 KJ mol−1were determined for violet B and violet 5R, respectively. The rate of adsorption of violet 5R was faster than that of violet B (kV5R>kVB). The prepared COP could thus be used as promising adsorbent for removal of organic dyes, especially azo dye, from polluted water. The solid COP could be conveniently regenerated after adsorption.

Sign in / Sign up

Export Citation Format

Share Document