scholarly journals A Strategy to Revalue a Wood Waste for Simultaneous Cadmium Removal and Wastewater Disinfection

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Aleksandra Ivanovska ◽  
Sonja Veljović ◽  
Biljana Dojčinović ◽  
Nenad Tadić ◽  
Katarina Mihajlovski ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Cadmium Concentration ◽  
Crystallinity Index ◽  
Wood Waste ◽  
Bacterial Reduction ◽  
Cadmium Removal ◽  
E Coli ◽  
Wastewater Disinfection ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model

In this investigation, the possibility of wood waste (hardwoods such as oaks’ and alternatives’ staves from Balkan cooperage) revalorization for simultaneous cadmium removal and wastewater disinfection was examined. All samples were characterized in terms of their crystallinity index and crystallite size, amount of functional groups, and surface chemistry (determined by ATR-FTIR) as well as antibacterial activity. Mulberry is characterized by the lowest crystallinity index which can be ascribed to the highest crystallite size disabling crystallite denser packaging, while myrobalan plum has about 23% lower crystallite size that enables crystallite better packaging, thus resulting in a 42.4% higher crystallinity index compared to the mulberry. All oaks have a significantly higher amount of carboxyl groups compared to the alternatives (0.23-0.28 vs. 0.12-0.19 mmol/g). The adsorption experiments revealed that with increasing the initial cadmium concentration from 15 up to 55 mg/g, samples’ adsorption capacity increases by 89-220%. The equilibrium data fit well with the Langmuir isotherm model implying monolayer coverage of cadmium ions over a homogeneous wood surface. The relationship between the samples’ maximum adsorption capacities (ranged from 5.726 to 12.618 mg/g), their crystallinity index, and crystallite size was established. According to ATR-FTIR spectra, aldehyde, carboxyl, hydroxyl, and phenyl groups present on the wood waste surface are involved in Cd2+ adsorption which proceeds via the interplay of the complexation, cation-π interactions, and ion-exchange mechanisms. Mulberry and myrobalan plum showed about 89% and 80% of the total uptake capacity of cadmium within 60 min, while the equilibrium was attained after 240 min of contact time. Good compliance with pseudo-second kinetic order indicated that cadmium adsorption was mediated by chemical forces. Thermodynamic parameters revealed the spontaneous and exothermic character of cadmium ion adsorption onto mulberry and myrobalan plum. All studied samples provide maximum bacterial reduction (>99%) for E. coli and S. aureus. Wood waste from Balkan cooperage can be successfully used for simultaneous cadmium removal and wastewater disinfection.

scholarly journals Cadmium Removal by using Pumice Modified with Iron Nanoparticles from Aqueous Solutions

2016 ◽  
Vol 18 (2) ◽  
pp. 426-436 ◽  
Keyword(s):  
Contact Time ◽  
Iron Nanoparticles ◽  
Cadmium Concentration ◽  
Synthetic Wastewater ◽  
Isotherm Models ◽  
Cadmium Removal ◽  
Pumice Stone ◽  
Practical Applications ◽  
Equilibrium Data ◽  
Adsorbent Dose

<p>In this study, the removal of cadmium by using pumice coated with iron nanoparticles (INPs) from synthetic wastewater was investigated. The effects of parameters influencing adsorption: contact time (10-20 min), pH (3-9), initial cadmium concentration (25-125 mg l<sup>-1</sup>) and adsorbent dose (2-10 g l<sup>-1</sup>) were studied. The pumice stone used in this research was, first, crashed and then sieved with 20 mesh standard sieves (0.85 mm); finally, it was coated with INPs. An atomic absorption spectrophotometer was used to measure cadmium contents and isotherm models and adsorption kinetics were studied. The results showed the adsorption process of cadmium reached equilibrium at contact time of 80 min. With increasing pH solution, the efficiency enhanced which peaked at pH 7-8. Cadmium concentration increase resulted in a decrease in efficiency, whereas adsorbent dose increase improved it. Equilibrium data of adsorption followed isotherms models: Langmuir and Freundlich. The highest removal efficiency and adsorption capacity were, respectively, 83% and 17.27 mg g<sup>-1</sup>. Furthermore, absorption kinetics is better described by the pseudo second-order model. According to the results obtained, pumice coated with INPs is an effective adsorbent and can be introduced as a suitable option in practical applications</p>

Effect of Particle Size on Cadmium Removal by Banana Peels

2015 ◽  
Vol 72 (4) ◽  
Author(s):  
Mohd Ismid Mohd Said ◽  
Shaikhah Sabri ◽  
Shamila Azman
Keyword(s):  
Particle Size ◽  
Metal Removal ◽  
Low Cost ◽  
Polluted Water ◽  
Banana Peel ◽  
Cadmium Removal ◽  
Musa Balbisiana ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Equilibrium Data

Contamination of metals in aquatic environment is a worldwide problem because of its toxicity and capability to accumulate in biological chain, as well as persistence in the natural environment. Therefore various expensive technologies have been applied to treat metal-polluted water. In Malaysia there are abundance of banana species available which could provide cheap, low cost and environmental friendly bio-materials. Preliminary study was conducted on two species of banana i.e. Musa balbisiana (Nipah) and Musa acuminata (Kapas). The banana peels were washed, dried and grounded into various range of particle sizes (0.20–1.18 mm). The ability of the adsorbents were determined by agitation of 1.0 g banana peel and 100 ml of cadmium standard solution at the concentration of 100 mg/L. Musa balbisiana showed the highest removal of cadmium at 89.58% from the initial concentration compared to Musa acuminate with the particle size of 0.30-0.60 mm. Adsorption equilibrium data are well described by Langmuir isotherm model. The result also shows that different species have different capabilities to adsorb metal. Hence, their potential as bio-adsorbent could be further be examined for metal removal from wastewater.

scholarly journals Effective Poly (Cyclotriphosphazene-Co-4,4′-Sulfonyldiphenol)@rGO Sheets for Tetracycline Adsorption: Fabrication, Characterization, Adsorption Kinetics and Thermodynamics

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1540
Author(s):  
Muhammad Ahmad ◽  
Tehseen Nawaz ◽  
Mohammad Mujahid Alam ◽  
Yasir Abbas ◽  
Shafqat Ali ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
High Adsorption ◽  
Clean Environment ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
High Adsorption Capacity ◽  
Adsorption Equilibrium Data

The development of excellent drug adsorbents and clarifying the interaction mechanisms between adsorbents and adsorbates are greatly desired for a clean environment. Herein, we report that a reduced graphene oxide modified sheeted polyphosphazene (rGO/poly (cyclotriphosphazene-co-4,4′-sulfonyldiphenol)) defined as PZS on rGO was used to remove the tetracycline (TC) drug from an aqueous solution. Compared to PZS microspheres, the adsorption capacity of sheeted PZS@rGO exhibited a high adsorption capacity of 496 mg/g. The adsorption equilibrium data well obeyed the Langmuir isotherm model, and the kinetics isotherm was fitted to the pseudo-second-order model. Thermodynamic analysis showed that the adsorption of TC was an exothermic, spontaneous process. Furthermore, we highlighted the importance of the surface modification of PZS by the introduction of rGO, which tremendously increased the surface area necessary for high adsorption. Along with high surface area, electrostatic attractions, H-bonding, π-π stacking and Lewis acid-base interactions were involved in the high adsorption capacity of PZS@rGO. Furthermore, we also proposed the mechanism of TC adsorption via PZS@rGO.

Urban wastewater disinfection for agricultural reuse: effect of solar driven AOPs in the inactivation of a multidrug resistant E. coli strain

2015 ◽  
Vol 178 ◽  
pp. 65-73 ◽  
Author(s):  
Giovanna Ferro ◽  
Antonino Fiorentino ◽  
María Castro Alferez ◽  
M. Inmaculada Polo-López ◽  
Luigi Rizzo ◽  
...  
Keyword(s):  
Multidrug Resistant ◽  
Coli Strain ◽  
Urban Wastewater ◽  
E Coli ◽  
Wastewater Disinfection

scholarly journals Adsorption capability of brewed tea waste in waters containing toxic lead(II), cadmium (II), nickel (II), and zinc(II) heavy metal ions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hakan Çelebi ◽  
Gülden Gök ◽  
Oğuzhan Gök
Keyword(s):  
Heavy Metals ◽  
Adsorption Process ◽  
Low Cost ◽  
Adsorption Capacities ◽  
Tea Waste ◽  
Optimum Ph ◽  
Effects Of Ph ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Capability

Abstract Recently, the search for low-cost eco-friendly adsorbents has become one of the main objectives of researchers. The aim of this study was to test the removal of four heavy metals, namely lead (Pb), zinc (Zn), nickel (Ni) and cadmium (Cd), from a simulated watery solution using brewed tea waste as a potentially suitable adsorbent. The effects of pH levels (2.0–6.0), adsorbent amount (0.1–5.0 g), contact times (1–150 min.) were examined throughout the adsorption process. The results of the experiments showed that the heavy metals elimination yields had an inverse relationship with pH and a linear relationship between the other parameters. The optimum pH for the removal of the heavy metals was between 4.0 and 5.0 in the case of the brewed tea waste. Equilibrium times of 2, 10, 30 and 5 min were required for the adsorption of Pb, Zn, Ni, Cd onto Camellia sinensis, respectively. Based on the results of this study it can be said that brewed tea waste has a high potential to remove heavy metals from aqueous solutions. The maximum adsorption capacities were calculated as 1.197, 1.457, 1.163 and 2.468 mg/g, for Pb, Zn, Ni and Cd, respectively, by fitting the equilibrium data to the Langmuir isotherm model.

Inactivation of E. coli, Enterococcus spp., somatic coliphage, and Cryptosporidium parvum in wastewater by peracetic acid (PAA), sodium hypochlorite, and combined PAA-ultraviolet disinfection

2020 ◽  
Vol 6 (1) ◽  
pp. 197-209 ◽  
Author(s):  
Abdulrahman H. Hassaballah ◽  
Tanmay Bhatt ◽  
Jeremy Nyitrai ◽  
Ning Dai ◽  
Lauren Sassoubre
Keyword(s):  
Sodium Hypochlorite ◽  
Cryptosporidium Parvum ◽  
Peracetic Acid ◽  
Ecosystem Health ◽  
Ultraviolet Disinfection ◽  
E Coli ◽  
Enterococcus Spp ◽  
Wastewater Disinfection ◽  
Somatic Coliphage

Wastewater disinfection is important to protect human and ecosystem health.

scholarly journals Investigation on adsorption capacity of TiO2-P25 nanoparticles in the removal of a mono-azo dye from aqueous solution: A comprehensive isotherm analysis

2014 ◽  
Vol 20 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Mohammad Behnajady ◽  
Shahrzad Yavari ◽  
Nasser Modirshahla
Keyword(s):  
Aqueous Solution ◽  
Crystallite Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Correlation Coefficients ◽  
Average Crystallite Size ◽  
Isotherm Models ◽  
Equilibrium Data ◽  
Pseudo Second Order

In this work TiO2-P25 nanoparticles with high surface area have been used as adsorbent for the removal of C.I Acid Red 27 (AR27), as an organic contaminant from aqueous solution. Characteristics of phases and crystallite size of TiO2-P25 nanoparticles were achieved from XRD and the surface area and pore size distribution were obtained from BET and BJH techniques. TiO2-P25 nanoparticles with almost 80% anatase and 20% rutile phases, the average crystallite size of 18 nm, have specific surface area of 56.82 m2 g-1. The effect of various parameters like initial AR27 concentration, pH, contact time and adsorbent dosage has been carried out in order to find desired adsorption conditions. The desired pH for adsorption of AR27 onto TiO2-P25 nanoparticles was 3. The equilibrium data were analyzed with various 2-, 3- and 4-parameter isotherm models. Equilibrium data fitted very well by the 4-parameter Fritz-Schluender model. Results of adsorption kinetics study indicated that the pseudo-second order kinetics provided the best fit with correlation coefficients close to unity.

Adsorption of Copper Ions from Wastewater by Carboxymethylcellulose Sulfate

2011 ◽  
Vol 393-395 ◽  
pp. 1098-1101 ◽  
Author(s):  
Yan Yu ◽  
Feng Yuan Huang
Keyword(s):  
Contact Time ◽  
Copper Concentration ◽  
Adsorption Process ◽  
Ph Value ◽  
Copper Ions ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Optimum Ph ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model

In the present paper, the ability of carboxymethylcellulose sulfate (CMC-S) for Cu(II) removal was studied. The influence of factors, such as the pH value, the initial copper concentrations, and the contact time, were investigated in detail. Atomic absorption spectrophotometer was applied to determined the concentration of Cu(II). The results showed that the adsorption process was strongly dependent on the pH value and the initial copper concentration. The optimum pH value was in the range of 6-7. The theoretical adsorption capacities for Cu(II) was 127.7 mg/g. The equilibrium data was well fitted to the Langmuir isotherm model at 25°C, which can be explained as a monolayer adsorption.

scholarly journals Adsorption of Nickel and Chromium Ions by Amine-Functionalized Silica Aerogel

2018 ◽  
Vol 156 ◽  
pp. 03014
Author(s):  
Sudarat Sertsing ◽  
Thanaphat Chukeaw ◽  
Sitthiphong Pengpanich ◽  
Bawornpong Pornchuti
Keyword(s):  
Silica Aerogel ◽  
Solution Concentration ◽  
Functionalized Silica ◽  
Solution Ph ◽  
Chromium Ions ◽  
Amine Functionalized ◽  
Adsorption Capacities ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Equilibrium Data

In this study, silica aerogel was synthesized by drying at atmospheric pressure and modified further with aminopropyl triethoxysilane (APTES). The amine-functionalized silica aerogel was investigated as an adsorbent for removal of nickel and chromium ions. The effect of contact time, solution pH, and initial solution concentration were studied. The equilibrium was achieved within 60 min. The optimum pH was found to be 4. Adsorption equilibrium data were agreed fairly well with Langmuir isotherm model. Adsorption capacities for nickel and chromium ions were found to be 40.32 mg/g and 46.08 mg/g, respectively.

Novel Antimicrobial Peptide-Based Blood Safety Strategies for Bacterial Reduction

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 3044-3044
Author(s):  
Ketha V. K. Mohan ◽  
Shilpakala Sainath Rao ◽  
Chintamani D Atreya
Keyword(s):  
Bacillus Cereus ◽  
Safety Concern ◽  
Colony Count ◽  
Transfusion Medicine ◽  
Plasma Samples ◽  
Bacterial Reduction ◽  
E Coli ◽  
Spiked Sample ◽  
Tryptophan Residues ◽  
Synthetic Antimicrobial Peptides

Abstract Bacterial contamination of blood and blood components is a major safety concern in transfusion medicine. In order to facilitate safer transfusion products to the end users, there is a critical need for novel proof-of-concept ideas for pathogen reduction, which are different from the current ones that outweigh the associated toxicity and/or contamination risk. Present study involves use of nine novel synthetic antimicrobial peptides (four originated from thrombin-induced human platelet derived antimicrobial proteins named PP1-PP4 and five having 1–5 repeats of arginine and tryptophan residues, named DP1-DP5. These peptides were tested on plasma samples spiked with 10-fold dilutions of 5 different bacteria (Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Bacillus cereus) that are important to the field of transfusion medicine and analyzed whether these spiked plasma samples could be cured of the pathogens. Each spiked sample was incubated with a peptide (PP1-PP4 and DP1-DP5) for 2 hours at 37°C. Following incubation, a fixed volume of the inoculum was plated on nutrient agar plates and incubated overnight at 37°C for colony count. Spiked sample without any peptide was included as control. Results revealed that out of nine peptides tested, while DP3 and DP4 were active against all 5 organisms tested resulting in 50–100 % of inhibition of specific organisms, peptide PP4 was only active against E. coli, P. aeruginosa and Bacillus cereus resulting in a 30–100% reduction in the CFU/ml compared to the controls. Table 1 Organism Colony count expressed in % Control PP1 PP2 PP3 PP4 DP1 DP2 DP3 DP4 DP5 S. aureus 100 90 100 26 100 100 20 10 56 100 E. coli 100 95 100 100 71 100 93 4 18 85 P. aeruginosa 100 100 100 100 0 100 0 0 13 100 K. pneumoniae 100 100 100 100 100 74 3 0 0 25 B. cereus 100 100 100 100 50 100 100 25 77 100 Based on these results, it appears that peptides used in this study provide a new antibacterial strategy against a range of bacteria and with further studies and refinement, these peptides could prove useful towards bacterial reduction in blood and blood products. The findings and conclusions in this abstract have not been formally disseminated by the Food and Drug Administration and should not be construed to represent any Agency determination or policy.

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