scholarly journals Fabrication of nano zero valent iron/biopolymer composite with antibacterial properties for simultaneous removal of nitrate and humic acid: Kinetics and isotherm studies

2021 ◽  
Author(s):  
Nazanin Zahra Pourbaghaei ◽  
Mansoor Anbia ◽  
Fatemeh Rahimi
Keyword(s):  
Humic Acid ◽  
Aqueous Solutions ◽  
Desirability Function ◽  
Aqueous Media ◽  
Antibacterial Properties ◽  
Freundlich Isotherm ◽  
Zerovalent Iron ◽  
Simultaneous Removal ◽  
High Antibacterial Activity ◽  
Isotherm Adsorption

Abstract This investigation compared the adsorption behavior of humic acid (HA) on cellulose, chitosan and nano zerovalent iron/chitosan (nZVI/chitosan). Results show that nZVI/chitosan is very effective in the adsorption of HA from aqueous media. The feasibility of using nZVI/chitosan as an adsorbent for the simultaneous removal of nitrate and HA from aqueous media was also studied. Structural analyses of the samples were identified by TEM, FT-IR, EDX, XRD and N2 isotherms. The effects of pH, amount of composite, nitrate concentration, HA concentration and contact time and their interactions on responses were explored by central composite design (CCD) and response surface methodology (RSM). The optimal conditions of pH (5.5), adsorbent amount (0.098 g), reaction time (27 min) and initial concentrations (110 mg/L for nitrate and 30 mg/L for HA) were obtained from desirability function. The adsorption properties of the resulting nanocomposite toward nitrate and HA were investigated through kinetic and isotherm adsorption studies. The adsorption kinetics was found to fit the pseudo-second order model. The results obtained indicate that nitrate uptake fitted well with the Langmuir model while the Freundlich isotherm was the best model for describing the multilayer uptake of HA from aqueous solutions. Moreover, nZVI/chitosan nanocomposite illustrates a very high antibacterial activity against pathogen bacteria strains such as Staphylococcus aureus ATCC 25935, ATCC 25923, and Pseudomonas aeruginosa ATCC 27853. The findings reported in this investigation highlight the potential of using nZVI/chitosan as a promising adsorbent for the simultaneous removal of nitrate and HA from aqueous solutions.

scholarly journals The Immobilization Effect of Natural Mineral Materials on Cr(VI) Remediation in Water and Soil

2020 ◽  
Vol 17 (8) ◽  
pp. 2832 ◽  
Author(s):  
Dading Zhang ◽  
Yanqiu Xu ◽  
Xiaofei Li ◽  
Lina Wang ◽  
Xuwen He ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Freundlich Isotherm ◽  
Soil Toxicity ◽  
Adsorption Model ◽  
X Ray Diffraction ◽  
Isothermal Adsorption ◽  
Adsorption Models ◽  
Natural Mineral ◽  
Isotherm Adsorption ◽  
Molecular Bond

The effects of sepiolite, montmorillonite, and attapulgite on the removal and immobilization of Cr(VI) in water and soil were studied. X-ray diffraction (XRD) characterizations showed that the purities of these three mineral materials decreased in the following order: montmorillonite > attapulgite > sepiolite, and that their surface molecular bond types were similar. The adsorption potential of Cr(VI) in aqueous solutions of the three mineral materials was in the following order: sepiolite > attapulgite > montmorillonite. The adsorption mechanism for attapulgite was consistent with the Freundlich isotherm adsorption model, whereas that for montmorillonite was more consistent with the Langmuir model. Sepiolite had a good fitting effect for both isothermal adsorption models. For montmorillonite and attapulgite, a lower pH corresponded to a higher removal of Cr(VI). For sepiolite, however, the removal efficiency of Cr(VI) from an aqueous solution was the lowest at a pH of approximately 5.0. The results of the soil toxicity characteristic leaching procedure showed that, following the addition of 15% sepiolite, attapulgite, or montmorillonite to the contaminated soil, Cr(VI) concentrations in the leachates decreased by 16.8%, 18.9%, and 15.9%, respectively, and the total Cr concentrations in the leachates were reduced by 21.2%, 29.2%, and 17.6%. Of the three mineral materials, attapulgite demonstrated the highest Cr(VI) immobilization efficiency in soil. This study emphasizes the effect of attapulgite on the immobilization of Cr(VI) in soil and aqueous solutions, thus providing a theoretical basis for the potential application of natural mineral material remediation of Cr(VI)-contaminated aqueous solutions and soils.

scholarly journals Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles

2014 ◽  
Vol 63 ◽  
pp. 102-111 ◽  
Author(s):  
Yiming Su ◽  
Adeyemi S. Adeleye ◽  
Yuxiong Huang ◽  
Xiaoya Sun ◽  
Chaomeng Dai ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Zerovalent Iron ◽  
Simultaneous Removal ◽  
Nanoscale Zerovalent Iron

scholarly journals Superhigh Adsorption of Cadmium(II) Ions onto Surface Modified Nano Zerovalent Iron Composite (CNS-nZVI): Characterization, Adsorption Kinetics and Isotherm Studies

2021 ◽  
Vol 15 (4) ◽  
pp. 457-464
Author(s):  
Prabu Deivasigamani ◽  
◽  
Senthil Kumar Ponnusamy ◽  
Sathish Sundararaman ◽  
Suresh A ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Freundlich Isotherm ◽  
Zerovalent Iron ◽  
Nanoscale Zerovalent Iron ◽  
Cashew Nut ◽  
Pseudo Second Order ◽  
Cashew Nut Shell ◽  
Surface Modified ◽  
Adsorption Kinetics And Isotherm

The efficiency of surface modified nanoscale zerovalent iron (nZVI) composite by cashew nut shell (CNS) was tested for the removal of cadmium ions from the aqueous solutions. 2 g/l CNS-nZVI was efficient for 98% removal. The adsorption capacity was 35.58 mg/g. The Freundlich isotherm (R2 = 0.9769) and the pseudo-second order adsorption kinetics data fitted well. This proved CNS-nZVI has a high removal efficiency for Cd(II) from aqueous solutions.

Simultaneous removal of arsenite and cadmium by a manganese-crosslinking sodium alginate modified biochar and zerovalent iron composite from aqueous solutions

2022 ◽  
Author(s):  
Wei Mao ◽  
Lixun Zhang ◽  
Ying Zhang ◽  
Yuntao Guan
Keyword(s):  
Aqueous Solutions ◽  
Sodium Alginate ◽  
Zerovalent Iron ◽  
Contaminated Water ◽  
Simultaneous Removal ◽  
Modified Biochar

A novel manganese-crosslinking sodium alginate modified biochar and zerovalent iron composite (Mn/SA-BC@nZVI) was prepared for the simultaneous removal of arsenite (As(iii)) and cadmium (Cd(ii)) from contaminated water.

scholarly journals Adsorption of Congo Red from Aqueous Solutions by Porous Soybean Curd Xerogels

2018 ◽  
Vol 20 (3) ◽  
pp. 95-102 ◽  
Author(s):  
Zhao Zhang ◽  
Yanhui Li ◽  
Qiuju Du ◽  
Qi Li
Keyword(s):  
Aqueous Solutions ◽  
Congo Red ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Drying Method ◽  
Solution Ph ◽  
Soybean Curd ◽  
High Quality Protein ◽  
Isotherm Adsorption ◽  
Order Kinetic Model

Abstract Soybean curd is a very popular food containing high-quality protein, polyunsaturated fats, vitamins, minerals and other nutrients. This study aims to prepare porous soybean curd xerogels via a vacuum freeze drying method and uses them as adsorbents to remove congo red from aqueous solutions. The morphology and functional groups of the soybean curd xerogels were characterized using scanning electron microscopy and Fourier transform infrared spectroscopy, respectively. The adsorption properties of congo red onto the soybean curd xerogels were carried out through investigating the infl uencing experimental parameters such as the drying method, solution pH, adsorbent dose, contact time and temperature. The results showed that the adsorption isotherm data were fitted well to the Freundlich isotherm. Adsorption kinetics of congo red onto the soybean curd followed the pseudo-second-order kinetic model. The thermodynamic parameters, such as ΔG0, ΔH0 and ΔS0, were also determined.

Adsorption of Congo Red Dye from Aqueous Solutions by Montmorillonite as a Low-cost Adsorbent

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
Yusef Omidi Khaniabadi ◽  
Hassan Basiri ◽  
Heshmatollah Nourmoradi ◽  
Mohammad Javad Mohammadi ◽  
Ahmad Reza Yari ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Congo Red ◽  
Low Cost ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Effective Option ◽  
Pseudo Second Order

AbstractIn this study, the sorption of Congo red (CR), as a toxic dye, from aqueous media was investigated using montmorillonite (MMT) as a low-cost adsorbent. The influence of several factors such as contact time, pH, adsorbent dosage, dye content, and ionic strength was investigated on the dye removal. MMT was characterized by Fourier transformed infrared (FTIR) spectroscopy and X-ray diffractometer (XRD). Different kinetic and isotherm models including pseudo-first and pseudo-second order kinetic and Langmuir and Freundlich were applied to analyze experimental data, respectively. The results showed that the data were well fitted by pseudo-second-order kinetic and Freundlich isotherm models. The optimum conditions for the sorption of CR were achieved over 40 min and at pH=2. According to the results of the present study, MMT can be used as a low-cost, eco-friendly and effective option for the adsorption of CR from aqueous solutions.

scholarly journals Enhanced Conductivity and Antibacterial Behavior of Cotton via the Electroless Deposition of Silver

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4731
Author(s):  
Changkun Liu ◽  
Dan Liao ◽  
Fuqing Ma ◽  
Zenan Huang ◽  
Ji’an Liu ◽  
...  
Keyword(s):  
Electroless Deposition ◽  
Deposition Time ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
High Antibacterial Activity ◽  
Physical And Chemical ◽  
And Staphylococcus Aureus ◽  
Enhanced Conductivity ◽  
And Chemical Properties

In this study, the surface-initiated atom transfer radical polymerization (SI-ATRP) technique and electroless deposition of silver (Ag) were used to prepare a novel multi-functional cotton (Cotton-Ag), possessing both conductive and antibacterial behaviors. It was found that the optimal electroless deposition time was 20 min for a weight gain of 40.4%. The physical and chemical properties of Cotton-Ag were investigated. It was found that Cotton-Ag was conductive and showed much lower electrical resistance, compared to the pristine cotton. The antibacterial properties of Cotton-Ag were also explored, and high antibacterial activity against both Escherichia coli and Staphylococcus aureus was observed.

Bicomponent multifilament yarns of recycled poly(ethylene terephthalate) and nano-titanium dioxide for antibacterial carpet

2021 ◽  
pp. 152808372110117
Author(s):  
Sommai Pivsa-Art ◽  
Komson Sunyikhan ◽  
Weraporn Pivsa-Art
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Ethylene Terephthalate ◽  
Antibacterial Properties ◽  
Nano Structure ◽  
Elongation At Break ◽  
High Antibacterial Activity ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Multifilament Yarns

Recycled poly(ethylene terephthalate) (RPET) multifilament yarns are used in carpet manufacturing as a way to reduce plastic waste. The conventional RPET carpet is however susceptible to bacterial accumulation. As a result, this research experimentally doped RPET with nano-structure titanium dioxide (nano-TiO2) to produce RPET/nano-TiO2 bicomponent multifilament yarns with antibacterial property. The experimental multifilament yarn structure consisted of two parts: neat RPET core and RPET/nano-TiO2 shell. The nano-TiO2 content in the shell was varied between 1 and 3 wt% and the core/shell (C/S) ratios between 90/10, 70/30, and 50/50 w/w. The effects of C/S ratio and nano-TiO2 content on the mechanical and antibacterial properties of bicomponent multifilament yarns were determined. The experimental results indicated that the C/S ratio had no effect on the tenacity and elongation at break. Meanwhile, the tenacity and elongation at break of bicomponent fibers increased with nano-TiO2 content in the shell. The TiO2-doped RPET bicomponent yarns effectively inhibited the growth of Escherichia coli and Staphylococcus aureus. The 90/10 bicomponent multifilament fiber with 3 wt% TiO2 achieved the highest antibacterial activity. The very high antibacterial activity was attributable to greater deposition of nano-TiO2 particles near and on the shell surface.

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