scholarly journals Preparation and optimization of the composition of novel nZVI/(Fe-Mn) binary oxide/bentonite adsorbent for removal of reactive yellow 145 dye (RY-145) from aqueous solution

2020 ◽  
Vol 9 (3) ◽  
pp. 45-51
Author(s):  
Huyen Pham Thi Thanh ◽  
Duong Nguyen Binh ◽  
Trang Quan Thi Thu ◽  
Bich Phan Thi Ngoc ◽  
Lam Pham Van
Keyword(s):  
Aqueous Solution ◽  
Binary Oxide ◽  
Adsorption Efficiency ◽  
Optimal Point ◽  
Optimization Study ◽  
Adsorption Condition ◽  
Surface Response Method ◽  
Rsm Model ◽  
Response Method ◽  
Optimization Of Composition

In this study, a new composite of nZVI/ (Fe - Mn) binary oxide/bentonite (IFMB) was synthesized and  used  as an adsorbent for the removal of reactive yellow 145 dye (RY- 145) from aqueous solution. Optimization of composition of IFMB composite for removal of RY - 145 dye was conducted with the help of surface response method (SRM). Three independent variables affecting to the RY-145 adsorption efficiency were selected for optimization study: Fe/Mn ratio (mol/mol), Bentonite content (wt. %) and nZVI content (wt. %). The study reveals that optimal compositions of  IFMB composite for RY-145 removal was Fe/Mn = 1,75; Bentonite 9,46 wt. % and nZVI 16,97 wt. %. In the adsorption condition: adsorbent dose  of 1g.L-1, initial dye concentration of 200 mg.L-1, contact time of 120 min at 120 rpm and at 25 oC, the adsorption capacity for RY-145 dye on IMFB composite is 197 mg.g-1. The value of RY-145 adsorption efficiency calculated by the model at the optimal point has been compared with the experimental value and the error is very small (0,36%). This proves that the RSM model has good repeatability.

scholarly journals Performance of silver-coated red soil nanocomposites in water disinfection

2018 ◽  
Vol 54 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Ebrahim Mahmoudi ◽  
Farid Moeinpour
Keyword(s):  
Contact Time ◽  
Elimination Rate ◽  
Red Soil ◽  
Water Disinfection ◽  
Box Behnken Design ◽  
E Coli ◽  
Surface Response Method ◽  
Research Findings ◽  
Response Method ◽  
Bacterial Effect

Abstract The present research studied the anti-bacterial effect of silver-coated red soil nanoparticles on Gram-negative bacteria Escherichia coli (E. coli) from water. The effects of disinfectant concentration (0.02, 0.05 and 0.1 g/mL), contact time (10, 20 and 30 minutes) and bacteria number (102, 104 and 106 CFU/mL) have been also investigated. To obtain important factors, the interactions between factors and optimal experimental design in surface response method were used based on Box-Behnken design. According to the research findings, the system is efficient in eliminating E. coli. The results showed that E. coli elimination efficiency intensified through increasing the amount of disinfectant from 0.02 to 0.1 g/mL. Expanding contact time from 10 minutes to 30 minutes also heightened the E. coli elimination rate. R2 for E. coli elimination is 0.9956 indicating a good agreement between model experimental data and forecasting data.

Synthesis of metal organic framework modified with carboxylated attapulgite and adsorption properties for organic dye

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fanhua Wu ◽  
Yuyu Zhang ◽  
Tao Li ◽  
Yongfeng Liu ◽  
Yi Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hybrid Materials ◽  
Congo Red ◽  
Metal Organic Framework ◽  
Adsorption Efficiency ◽  
Anionic Dyes ◽  
Content Type ◽  
Low Concentration ◽  
Metal Organic ◽  
The Cost

Purpose The purpose of this study was to prepare carboxylated attapulgite (APT-COOH) and then be used as one of the ligands to prepare metal organic framework (MOF) hybrid materials to reduce the cost of MOF materials and improve the dispersed condition of APT. And then the materials were used to enrich anionic dye Congo red from aqueous solution. Design/methodology/approach The MOF hybrid materials were designed by means of facile reflux method rather than hydrothermal method, characterized by Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectrometer and pore structure. The dispersed degree of APT-COOH in the MOF materials was validated according to adsorption efficiency for Congo red. Findings Due to introduction of APT-COOH, the microenvironment of the MOF materials changed, leading to different adsorption behaviors. Compared to the MOF material without APT-COOH, the adsorption capacities of the hybridized MOF materials with different amounts of APT-COOH introduced increased by 4.58% and 15.55%, respectively, as the initial concentration of Congo red solution of 300 mg/L. Meantime, hybridized MOF materials were suitable to remove Congo red with low concentration, while the MOF material without APT-COOH was appropriate to enrich Congo red with high concentration. Research limitations/implications The microstructure of MOF hybrid materials in detail is the further and future investigation. Practical implications This study will provide a method to reduce the cost of MOF materials and a theoretical support to treat anionic dyes from aqueous solution. Originality/value APT-COOH was prepared and used as one of the ligands to synthesize MOF material to improve the dispersed degree of APT-COOH and reduce the cost of the MOF materials. The adsorption efficiency was greatly enhanced with low concentration of Congo red solution, and the results indicated that hydrogen bonding, electrostatic interaction, and p-p conjugation were involved in the adsorption process. The prepared MOFs materials exhibited excellent adsorption efficiency, which made the present materials highly promising and potentially useful in practical application as adsorbents to enrich anionic dyes such as Congo red from aqueous solution.

scholarly journals Removal of cadmium from aqueous solutions using excised leaves of Quetta pine (Pinus halepensis Mill.)

2015 ◽  
Vol 43 (3) ◽  
pp. 277-281 ◽  
Author(s):  
M Rahman ◽  
S Gul ◽  
M Ajmal ◽  
A Iqbal ◽  
Akk Achakzai
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Pinus Halepensis ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Adsorption Efficiency ◽  
Cadmium Removal ◽  
Optimum Ph ◽  
Maximum Contact ◽  
Adsorbent Dose

Removal of cadmium from aqueous solution was studied by using Quetta pine (Pinus halepensis Mill.) leaves. Batch adsorption experiments were performed as a function of appropriate equilibrium time, pH, concentration of adsorbate and amount of adsorbent. The optimum pH required for maximum adsorption was found to be 7.0 and the maximum contact time for the equilibrium was 30 minutes at adsorbent dose of 10 g. The maximum adsorption efficiency of cadmium removal was 98.50%. The results were better fitted by Langmuir than Freundlich isotherm. The separation factor of equilibrium 0.12 and 0.67 showed that Quetta pine leaves are good adsorbent of cadmium from aqueous solution DOI: http://dx.doi.org/10.3329/bjb.v43i3.21598 Bangladesh J. Bot. 43(3): 277-281, 2014 (December)

Highly effective removal of Cu(II) in aqueous solution by using mesoporous TiO2

2019 ◽  
Vol 80 (5) ◽  
pp. 884-891
Author(s):  
Daying Chen ◽  
Nasi Tu ◽  
Changkun Si ◽  
Meilin Yin ◽  
Xiaohui Wang
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Sol Gel ◽  
Mesoporous Tio2 ◽  
Adsorption Efficiency ◽  
Batch Experiments ◽  
Order Model ◽  
Effective Removal ◽  
Pseudo Second Order ◽  
Gel Processing

Abstract Mesoporous TiO2 has been prepared by a brief and simple sol–gel processing and applied for the removal of Cu(II) from aqueous solution. The adsorption behavior of mesoporous TiO2 for Cu(II) was investigated using batch experiments. Results showed that the pseudo-second-order model and Langmuir isotherm were more accurate to describe the kinetics process and adsorption isotherm. Mesoporous TiO2 adsorbent displayed excellent Cu(II) adsorption efficiency (195.52mg g−1). The thermodynamic parameters showed that the adsorption was spontaneous and endothermic. It was also found that mesoporous TiO2 could be used at least seven times without obvious loss of its original adsorption efficiency. Therefore, the obtained mesoporous TiO2 could be employed as an effective and low-cost adsorbent for removal of Cu(II) from contaminated effluents.

Adsorption studies of 17β-estradiol from aqueous solution using a novel stabilized Fe–Mn binary oxide nanocomposite

2019 ◽  
Vol 26 (8) ◽  
pp. 7614-7626 ◽  
Author(s):  
Ming-yang Dai ◽  
Yun-guo Liu ◽  
Guang-ming Zeng ◽  
Shao-bo Liu ◽  
Qi-meng Ning
Keyword(s):  
Aqueous Solution ◽  
Binary Oxide ◽  
Adsorption Studies ◽  
17Β Estradiol

The efficient adsorption removal of Cr(vi) by using Fe3O4 nanoparticles hybridized with carbonaceous materials

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60033-60040 ◽  
Author(s):  
Hongtao Gao ◽  
Shuang Lv ◽  
Jinbiao Dou ◽  
Miaomiao Kong ◽  
Dongmei Dai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Properties ◽  
Fe3o4 Nanoparticles ◽  
Adsorption Efficiency ◽  
Carbonaceous Materials ◽  
Adsorption Removal

Carbonaceous materials, such as pinecone and graphene, have been hybridized with Fe3O4 to modify its surface properties and enhance its adsorption efficiency for Cr(vi) removal in aqueous solution.

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