A comparative study of removal of Cu(II) from aqueous solutions by locally low-cost materials: marine macroalgae and agricultural by-products

The ability of activated carbon and different low-cost by-products and waste material as sorbents to remove various reactive dyes from aqueous solutions and wastewaters was investigated. All aqueous dye solutions contained 2,000 mg l-1 NaCl, to mimic real dye wastewater. Batch kinetic and isotherm experiments were conducted to determine the sorption-desorption behavior of the examined dyes from aqueous solutions and wastewaters by different sorbents, including activated carbon, fly ash, bentonite and bleaching earth. The results from the aqueous solutions indicate that the form of the isotherm equation is not necessarily unique for best description of both sorption and desorption data. The values of the isotherm parameters are not the same, indicating a significant hysteresis effect. Of the 9 sorption systems tested, 5 are best described by the Freundlich, 3 by the Langmuir and 1 by the linear sorption model. Of the 7 desorption systems tested, 5 are best described by the Freundlich and 2 by the linear model. In all cases, the sorption capacity for dye removal was higher for activated carbon, followed by fly-ash and then by bentonite.

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SPOTTED GOLDEN THISTLE STALKS AS A NOVEL LOW-COST SORBENT FOR METHYLENE BLUE SORPTION FROM SYNTHETIC AQUEOUS SOLUTIONS: EQUILIBRIUM AND KINETICS STUDIES

Environmental Engineering and Management Journal ◽

10.30638/eemj.2019.067 ◽

2019 ◽

Vol 18 (3) ◽

pp. 737-747 ◽

Cited By ~ 1

Author(s):

Houcine Benaissa ◽

Zoubida Senouci Bereksi

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Low Cost ◽

Kinetics Studies ◽

Equilibrium And Kinetics

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Comparison of the fixation of several metal ions onto a low-cost biopolymer

Water Science & Technology Water Supply ◽

10.2166/ws.2002.0172 ◽

2002 ◽

Vol 2 (5-6) ◽

pp. 217-224 ◽

Cited By ~ 6

Author(s):

Z. Reddad ◽

C. Gérente ◽

Y. Andrès ◽

P. Le Cloirec

Keyword(s):

Aqueous Solutions ◽

Metal Ions ◽

Low Cost ◽

Operating Conditions ◽

Order Kinetic ◽

Adsorption Mechanisms ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Beet Pulp ◽

Removal Of Metal Ions

In the present work, sugar beet pulp, a common waste from the sugar refining industry, was studied in the removal of metal ions from aqueous solutions. The ability of this cheap biopolymer to sorb several metals namely Pb2+, Cu2+, Zn2+, Cd2+ and Ni2+ in aqueous solutions was investigated. The metal fixation capacities of the sorbent were determined according to operating conditions and the fixation mechanisms were identified. The biopolymer has shown high elimination rates and interesting metal fixation capacities. A pseudo-second-order kinetic model was tested to investigate the adsorption mechanisms. The kinetic parameters of the model were calculated and discussed. For 8 × 10-4 M initial metal concentration, the initial sorption rates (v0) ranged from 0.063 mmol.g-1.min-1 for Pb2+ to 0.275 mmol.g-1.min-1 for Ni2+ ions, with the order: Ni2+ > Cd2+ > Zn2+ > Cu2+ > Pb2+. The equilibrium data fitted well with the Langmuir model and showed the following affinity order of the material: Pb2+ > Cu2+ > Zn2+ > Cd2+ > Ni2+. Then, the kinetic and equilibrium parameters calculated qm and v0 were tentatively correlated to the properties of the metals. Finally, equilibrium experiments in multimetallic systems were performed to study the competition of the fixation of Pb2+, Zn2+ and Ni2+ cations. In all cases, the metal fixation onto the biopolymer was found to be favourable in multicomponent systems. Based on these results, it is demonstrated that this biosorbent represents a low-cost solution for the treatment of metal-polluted wastewaters.

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Understanding the Role of Chlorine and Ozone to Control Postharvest Diseases in Fruit and Vegetables: A Review

Current Nutrition & Food Science ◽

10.2174/1573401315666190212161209 ◽

2020 ◽

Vol 16 (4) ◽

pp. 455-461

Author(s):

Gabriela M. Baia ◽

Otniel Freitas-Silva ◽

Murillo F. Junior

Keyword(s):

Chlorine Dioxide ◽

Broad Spectrum ◽

Fruits And Vegetables ◽

Low Cost ◽

Residual Effects ◽

Pathogenic Microorganisms ◽

Postharvest Diseases ◽

Post Harvest ◽

By Products

Fruits and vegetables are foods that come into contact with various types of microorganisms from planting to their consumption. A lack or poor sanitation of these products after harvest can cause high losses due to deterioration and/ or pathogenic microorganisms. There are practically no post-harvest fungicides or bactericides with a broad spectrum of action that have no toxic residual effects and are safe. However, to minimize such problems, the use of sanitizers is an efficient device against these microorganisms. Chlorine is the most prevalent sanitizing agent because of its broad spectrum, low cost and well-established practices. However, the inevitable formation of disinfection by-products, such as trihalomethanes (THMs) and haloacetic acids (HAAs), is considered one of the main threats to food safety. Alternative sanitizers, such as chlorine dioxide (ClO2) and ozone, are becoming popular as a substitute for traditional post-harvest treatments. Thus, this review addresses the use of chlorine, chlorine dioxide and ozone emphasizing aspects, such as usage, safe application, spectrum of action and legislation. In order to ensure the quality and safety of final products, the adoption of well-prepared sanitation and sanitation programs for post-harvest fruits and vegetables is essential.

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Green water-based binders for LiFePO4/C cathode in Li-ion batteries: a comparative study

New Journal of Chemistry ◽

10.1039/d1nj01208h ◽

2021 ◽

Author(s):

Xiaojing Zhang ◽

xinyi Ge ◽

Zhigang Shen ◽

Han Ma ◽

Jingshi Wang ◽

...

Keyword(s):

Comparative Study ◽

Polyvinylidene Fluoride ◽

Low Cost ◽

Green Water ◽

Li Ion Batteries ◽

Environmental Friendliness ◽

Water Based ◽

Li Ion

Compared with environmentally harmful binder polyvinylidene fluoride (PVDF) in Li-ion batteries (LIBs), water-based binders have many advantages, such as low cost, rich sources and environmental friendliness. In this study, various...

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Monomers, Materials and Energy from Coffee By-Products: A Review

Sustainability ◽

10.3390/su13126921 ◽

2021 ◽

Vol 13 (12) ◽

pp. 6921

Author(s):

Laura Sisti ◽

Annamaria Celli ◽

Grazia Totaro ◽

Patrizia Cinelli ◽

Francesca Signori ◽

...

Keyword(s):

Circular Economy ◽

Food Industry ◽

Food Packaging ◽

Low Cost ◽

Biofuel Production ◽

Material Technology ◽

Coffee Production ◽

Coffee Pulp ◽

Coffee Waste ◽

By Products

In recent years, the circular economy and sustainability have gained attention in the food industry aimed at recycling food industrial waste and residues. For example, several plant-based materials are nowadays used in packaging and biofuel production. Among them, by-products and waste from coffee processing constitute a largely available, low cost, good quality resource. Coffee production includes many steps, in which by-products are generated including coffee pulp, coffee husks, silver skin and spent coffee. This review aims to analyze the reasons why coffee waste can be considered as a valuable source in recycling strategies for the sustainable production of bio-based chemicals, materials and fuels. It addresses the most recent advances in monomer, polymer and plastic filler productions and applications based on the development of viable biorefinery technologies. The exploration of strategies to unlock the potential of this biomass for fuel productions is also revised. Coffee by-products valorization is a clear example of waste biorefinery. Future applications in areas such as biomedicine, food packaging and material technology should be taken into consideration. However, further efforts in techno-economic analysis and the assessment of the feasibility of valorization processes on an industrial scale are needed.

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Investigating the equilibrium and adsorption kinetics for the removal of Ni (II) ions from aqueous solutions using adsorbents prepared from the modified waste newspapers: A low-cost and available adsorbent

Microchemical Journal ◽

10.1016/j.microc.2019.02.042 ◽

2019 ◽

Vol 146 ◽

pp. 1043-1053 ◽

Cited By ~ 8

Author(s):

Mohammad Hadi Dehghani ◽

Mohammad Sarmadi ◽

Mohammad Reza Alipour ◽

Daryoush Sanaei ◽

Hamid Abdolmaleki ◽

...

Keyword(s):

Aqueous Solutions ◽

Adsorption Kinetics ◽

Low Cost

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Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Materials ◽

10.3390/ma14051312 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1312

Author(s):

Dereje Tadesse Mekonnen ◽

Esayas Alemayehu ◽

Bernd Lennartz

Keyword(s):

Aqueous Solutions ◽

Low Income ◽

Low Cost ◽

Volcanic Rocks ◽

Phosphate Removal ◽

Phosphate Adsorption ◽

Adsorptive Capacity ◽

Batch Adsorption ◽

Order Kinetic ◽

Adsorptive Removal

The contamination of surface and groundwater with phosphate originating from industrial and household wastewater remains a serious environmental issue in low-income countries. Herein, phosphate removal from aqueous solutions was studied using low-cost volcanic rocks such as pumice (VPum) and scoria (VSco), obtained from the Ethiopian Great Rift Valley. Batch adsorption experiments were conducted using phosphate solutions with concentrations of 0.5 to 25 mg·L−1 to examine the adsorption kinetic as well as equilibrium conditions. The experimental adsorption data were tested by employing various equilibrium adsorption models, and the Freundlich and Dubinin-Radushkevich (D-R) isotherms best depicted the observations. The maximum phosphate adsorption capacities of VPum and VSco were calculated and found to be 294 mg·kg−1 and 169 mg·kg−1, respectively. A pseudo-second-order kinetic model best described the experimental data with a coefficient of correlation of R2 > 0.99 for both VPum and VSco; however, VPum showed a slightly better selectivity for phosphate removal than VSco. The presence of competitive anions markedly reduced the removal efficiency of phosphate from the aqueous solution. The adsorptive removal of phosphate was affected by competitive anions in the order: HCO3− >F− > SO4−2 > NO3− > Cl− for VPum and HCO3− > F− > Cl− > SO4−2 > NO3− for VSco. The results indicate that the readily available volcanic rocks have a good adsorptive capacity for phosphate and shall be considered in future studies as test materials for phosphate removal from water in technical-scale experiments.

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