scholarly journals Color removal efficiency of rice husk biochar modified with magnetized iron oxides and nano zero valent iron for decolorization of dyeing wastewater

2020 ◽  
Vol 3 (2) ◽  
pp. 105-114
Author(s):  
Bao-Son Trinh ◽  
Pham Thi Kieu Chinh ◽  
Ha Đoan Tram
Keyword(s):  
Iron Oxides ◽  
Removal Efficiency ◽  
Rice Husk ◽  
Reactive Dyes ◽  
Zero Valent Iron ◽  
Color Removal ◽  
Dyeing Wastewater ◽  
Nano Zero Valent Iron ◽  
Initial Color ◽  
Rice Husk Biochar

Rice husk biochar, a rich-carbon material, can be modified with other reactive elements to improve its original properties for organic-contaminant removal efficiency. In this study, rice husk was heated to 600 oC without air in a closed-furnace for producing the rice husk biochar (BC600). BC600 was then magnetized for making an intermediate magnetized rice husk biochar (BC600-mag). Finally, nano zero valent iron (nZVI) was synthesized on BC600-mag for producing magnetized biochar impregnated nZVI (BC600-mag-nZVI). Batch experiments were conducted to investigate color removal efficiency of BC600-mag-nZVI for the reactive dyes yellow (RY145), red (RR195) and blue (RB19) from dyeing solutions with the initial color concentrations of approximately 400 Pt-Co. Results showed that, for RY145 and RR195, the optimum color removal efficiency (ɳopt) achieved the values of 95 and 93% at doses of 0.50 and 1.50 kg BC600-mag-nZVI/m3 dyeing solution, according to the treated color decreased to 21 and 30 Pt-Co, respectively, which are lower than the allowable discharged standard of column A (≤ 50 Pt-Co) of QCVN 40:2011/BTNMT, while for RB19, the ɳopt achieved the values of 63 % at dose of 8.00 kg BC600-mag-nZVI/m3 dyeing solution, according to the treated color decreased to 147 Pt-Co which is lower than the allowable discharged standard of column B (≤ 150 Pt-Co) of QCVN 40:2011/BTNMT. In addition, with increasing dose of the modified biochars, the color removal efficiency increased accordingly, achieving almost 100% for RY145 and RR195 and over 70% for RB19. It is concluded that the magnetic-nZVI rice husk biochars effectively removed the reactive dyes. In the other hand, the impregnation of nZVI particles on the biochar backbone spatially separates the particles, prevents their aggregation and therefore enhances their reactivity This study therefore proposes a new application of rice husk biochar modified with magnetized iron oxides and zero valent iron decolorization of dyeing wastewater.

scholarly journals Rice Husk Biochars Modified with Magnetized Iron Oxides and Nano Zero Valent Iron for Decolorization of Dyeing Wastewater

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 660 ◽  
Author(s):  
Bao-Son Trinh ◽  
Phung T. K. Le ◽  
David Werner ◽  
Nguyen H. Phuong ◽  
Tran Le Luu
Keyword(s):  
Removal Efficiency ◽  
Rice Husk ◽  
Low Cost ◽  
Reactive Dyes ◽  
Zero Valent Iron ◽  
Color Removal ◽  
Dyeing Wastewater ◽  
Decolorization Efficiency ◽  
Nano Zero Valent Iron ◽  
Rich Material

This study investigated if biochar, a low-cost carbon-rich material, can be modified with reactive materials for decolorization of dyeing wastewater. Two types of rice husk biochars were produced by using different processes of gasification and pyrolysis in limited air condition. The biochars were first magnetized and then modified with nano-scale zero-valent iron (nZVI) to achieve the final products of magnetic-nZVI biochars. Batch experiments were conducted to investigate the efficiency of the modified biochars for reducing color of the reactive dyes yellow (RY145), red (RR195), and blue (RB19) from dyeing solutions. Results showed that color removal efficiency of the modified biochars was significantly enhanced, achieving the values of 100% for RY145 and RR195 and ≥65% for RB19, while the effectiveness of the original biochar was significantly lower. In addition, with increasing dose of the modified biochars, the color removal efficiency increased accordingly. In contrast, when the dose of nZVI was increased beyond a certain value then its color removal efficiency decreased accordingly. It is reported that the magnetic-nZVI rice husk biochars effectively removed the reactive dyes. The impregnation of nZVI particles on the biochar surface spatially separates the nZVI particles, prevents its aggregation and therefore enhances the decolorization efficiency.

Color Removal from Dyeing Wastewater by the Polymer of Epichlorohydrin-Ethylenediamine

2013 ◽  
Vol 750-752 ◽  
pp. 1448-1451 ◽  
Author(s):  
Cui Zhen Sun ◽  
Xiao Rui Zhang ◽  
Zhi Bin Zhang ◽  
Yan Hao Zhang
Keyword(s):  
Removal Efficiency ◽  
Ferric Chloride ◽  
Reactive Dyes ◽  
Color Removal ◽  
Dyeing Wastewater ◽  
Neutralization Ability ◽  
Flocculation Process ◽  
Performance And Mechanism

A new polymer of epichlorohydrin-ethylenediamine was obtained by suspension polycondensation of ethylenediamine with epichlorohydrin. The color removal performance and mechanism of the polymer in the treatment of synthetic reactive dyes wastewater was investigated, and in comparison with polymeric aluminum ferric chloride (PAFC) and polydimethyldiallylammonium chloride (PDMDAAC). The results showed that epichlorohydrin-ethylenediamine achieved higher color removal efficiency, and its adsorption-bridging and electric neutralization ability playedimportant roles in the flocculation process.

scholarly journals The effect of different types of AOPs supported by hydrogen peroxide on the decolorization of methylene blue and viscose fibers dyeing wastewater

2021 ◽  
Author(s):  
Zeynep Bilici ◽  
Mohammed Saleh ◽  
Erdal Yabalak ◽  
Alireza Khataee ◽  
Nadir Dizge
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Textile Industry ◽  
Subcritical Water ◽  
Color Removal ◽  
H2o2 Concentration ◽  
Dyeing Wastewater ◽  
Viscose Fibers ◽  
Different Types ◽  
Removal Efficiencies

Abstract Wastewater from the textile industry containing a high concentration of organic and inorganic chemicals have strong color and residual chemical oxygen demand (COD). Therefore, advanced oxidation processes (AOPs) are very good candidates to treat textile industry wastewater. In this study, we investigated the effect of different types of AOPs supported with hydrogen peroxide (H2O2) on the treatment of viscose fibers dyeing wastewater. Fenton, photo-Fenton, and Fenton supported subcritical water oxidation (FSWO) processes were chosen as AOPs to compare the treatment efficiency of viscose fibers dyeing wastewater. The effects of solution pH, Fe2+ concentration, and H2O2 concentration on the treatment of viscose fibers dyeing wastewater were tested. The maximum color and COD removal efficiency was obtained corresponding to pH 2.5 for all oxidation methods when MB dye solution was used. However, the maximum efficiencies were obtained at pH 3.0 for real textile wastewater decolorization. The MB dye removal efficiency was increased to 97.22, 100, and 100% for Fenton, photo-Fenton, and FSWO processes, respectively, when the addition of H2O2 concentration was adjusted to 125 mg/L. However, the maximum color removal efficiencies of viscose fibers dyeing wastewater were obtained 56.94, 61.26, 64.11% for Fenton, photo-Fenton, FSWO processes, respectively. As a result, the FSWO showed maximum color removal efficiencies.

Influence Factors on Removal of Cadmium by Montmorillonite Supported Nano Zero-Valent Iron

2013 ◽  
Vol 807-809 ◽  
pp. 539-542 ◽  
Author(s):  
Zhi Hua Pang ◽  
Yong Liu ◽  
Jun Luo ◽  
Yu Tao Lei
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Zero Valent Iron ◽  
Initial Concentration ◽  
Nano Zero Valent Iron ◽  
Iron Material

The montmorillonite supported nanozero-valent iron material (MT-NZVI) was synthesized to remove cadmium (Cd). The results showed that the removal efficiency of MT-NZVI on cadmium was much higher than that of montmorillonite (MT), and the removal efficiency of MT-NZVI on cadmium reduced with the increase of the initial concentration and the pH value, but increased with the increase of the dosage.

Testing Permeable Reactive Barrier Media for Remediation of Uranium Plumes in Groundwater

2001 ◽  
Author(s):  
Dirk Mallants ◽  
Hugo Moors ◽  
Lian Wang ◽  
Norbert Maes ◽  
Hildegarde Vandenhove ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Removal Efficiency ◽  
Dissolved Inorganic Carbon ◽  
Cost Effective ◽  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Permeable Reactive Barrier ◽  
Carbonate Content ◽  
Equilibration Time ◽  
Reactive Materials

Abstract In-situ treatment of contaminated groundwater by means of permeable reactive barriers (PRBs) is becoming a cost-effective remediation technique. Various reactive materials that might be used in PRBs were tested in their ability to remove uranium from groundwater. Materials tested include ferric oxyhydroxides, coarse- and fine-grained zero-valent iron, aluminium-iron oxides, and zeolites. Batch tests were used to evaluate the removal efficiency of these materials. To analyse the effect of groundwater composition on the interaction between dissolved uranium and reactive materials, two types of groundwater were used, mainly differing in carbonate content and pH. Considering an equilibration time of 48 hours and initial uranium concentrations between 2.4 and 24 mg/1, finegrained zero-valent iron proved to be most effective with a uranium removal efficiency of more than 96% for carbon-rich groundwater and 99% for carbon-poor groundwater. Intermediate efficiency was observed for coarsegrained zero-valent iron and aluminium-iron oxides. Less than 10% of the dissolved uranium was adsorbed on the iron oxyhydroxides. Zeolites did not remove any uranium from solution. Results further indicated a positive correlation between dissolved inorganic carbon content and dissolved uranium at equilibrium. Because it can be easily obtained at a fairly low price, zero-valent iron is a promising material for use in PRBs.

Removal of Colour from Waste Water Using Coconut Shell Activated Carbon (CSAC) and Commercial Activated Carbon (CAC)

2013 ◽  
Vol 60 (1) ◽  
Author(s):  
Mohammed Jibril ◽  
Jaafar Noraini ◽  
Lai Shiou Poh ◽  
Abdullahi Mohammed Evuti
Keyword(s):  
Waste Water ◽  
Activated Carbon ◽  
Removal Efficiency ◽  
Color Removal ◽  
Coconut Shell ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Colour Removal ◽  
Initial Color ◽  
Coconut Shell Activated Carbon

Dalam kajian ini, satu siri eksperimen penjerapan berkelompok telah dijalankan untuk menyiasat kecekapan penyingkiran warna oleh CSAC dan CACs daripada air sisa. Kecekapan penjerapan telah dinilai dengan mengukur peratus penyingkiran warna. Kesan larutan pH, kepekatan adsorben, masa betindak balas dan kepekatan warna asal terhadap kecekapan penyingkiran warna juga telah disiasat. Penjerapan warna optimum dicapai pada pH rendah (pH 1.68), kepekatan warna asal yang rendah (50mg/l) dan 12g/l dos karbon dengan kecekapan penyingkiran sebanyak 75% untuk CAC dan 45% bagi CSAC, dengan pergolakan selama satu jam. Kecekapan penyingkiran warna yang rendah iaitu 25% untuk CAC dan 17% untuk CSAC telah diperoleh pada pH tinggi (ph 9-12), kepekatan warna asal yang tinggi iaitu 100mg/l dan dos karbon yang rendah untuk tempoh penahanan yang sama. Perbandingan antara model isotherm Langmuir dan Freundlich ke atas data penjerapan menunjukkan bahawa model isotermal Langmuir menunjukkan keputusan yang lebih baik dengan pekali korelasi, R2 yang lebih tinggi. Keputusan menunjukkan bahawa CSAC boleh digunakan sebagai alternatif kos rendah untuk CAC untuk menyingkirkan pewarna daripada air sisa tetapi kecekapannya penyingkirannya adalah lebih rendah berbanding CAC. Kata kunci: Warna pengeluaran; air sisa; arang batu; kelapa shell; karbon teraktif; Adsorpsi sesuhu In this study, series of batch adsorption experiment were conducted to examine the color removal efficiency of CSAC and CACs from waste water. The CAC is coal base activated carbon while the CSAC was manufactured in the laboratory. Yellow dye colour (Tartrazine E102) was utilized as the colourant. The adsorption efficiencies of the adsorbents were evaluated and compared by measuring the percentage of color removed. The effects of solution pH, adsorbent concentration, contact time as well as initial color concentration on the colour removal efficiency were also investigated. The optimum adsorption of color was achieved at low pH (pH 1.68), low initial color concentration (50mg/L) and 12g/l carbon dosage with removal efficiency of 75% for CAC and 45% for CSAC, with one hour agitation. Lower colour removal efficiency of 25% for CAC and 17% for CSAC were obtained at higher pH (pH 9-12), higher initial color concentration (100mg/L) and low carbon dosage, under the same retention time. A comparison of the Langmuir and Freundlich isotherm models of the adsorption data shows that Langmuir isotherm shows higher correlation coefficient, R2. The results indicate that CSAC has the potential as a low cost alternative for colour removal but the efficiency is lower than CSAC. Keywords: Color removal; waste water; coal; coconut shell; activated carbon; adsorption isotherm

scholarly journals Determination of the color removal efficiency of laccase enzyme depending on dye class and chromophore

2019 ◽  
Vol 80 (1) ◽  
pp. 134-143
Author(s):  
Deniz İzlen Çifçi ◽  
Rıza Atav ◽  
Yalçın Güneş ◽  
Elçin Güneş
Keyword(s):  
Removal Efficiency ◽  
Enzymatic Degradation ◽  
Reactive Dyes ◽  
Reactive Dye ◽  
Color Removal ◽  
The Other ◽  
Basic Dye ◽  
Removal Efficiencies ◽  
Laccase Enzyme

Abstract The aim of this article was to clarify which type of dye chromophores could be decolorized efficiently with the use of laccase enzyme. For this purpose, enzymatic degradation of different type of dye classes (4 reactive, 2 acid and 1 basic dye) having various chromophore groups was investigated by using commercial laccase from Cerrena unicolor. It was observed that the chromophore structure of dye is very important on enzymatic color removal efficiency. According to the experimental results, it was found that color removal efficiencies (20 mg/L initial dye) were 98.7% for RB220 (0.1 g/L enzyme after 6 h), 95.1% for RB19 (0.1 g/L enzyme after 48 h), 90.8% for AR42 (0.1 g/L enzyme after 48 h) while they were 60.9% for AR114 (0.25 g/L enzyme), 58.6% for RB21 (0.5 g/L enzyme), 39.7% for RR239 (0.25 g/L enzyme) even after seven days. As a result, it can be said that the highest decolorization rate was achieved for the reactive dye having formazan copper complex (RB220) chromophore. On the other hand, the enzymatic degradation of basic dye (BB9) was found to be rather difficult compared to the acid and reactive dyes used in this study and the maximum color removal was 42.8% after seven days.

scholarly journals Bisphenol A degradation by a new acidic nano zero-valent iron diatomite composite

2016 ◽  
Vol 6 (15) ◽  
pp. 6066-6075 ◽  
Author(s):  
Lingya Ma ◽  
Hongping He ◽  
Runliang Zhu ◽  
Jianxi Zhu ◽  
Ian D. R. Mackinnon ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Removal Efficiency ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron ◽  
Acidic Conditions ◽  
Ph Conditions ◽  
Iron Material

A new nano zero-valent iron material that generates acidic conditionsin situexhibits a high removal efficiency of BPA under natural pH conditions.

Nano Zero Valent Iron Composites for Water Decontamination: A Review

2018 ◽  
Vol 5 (2) ◽  
pp. 88-101
Author(s):  
Nivedita Shukla ◽  
Amit Saxena ◽  
Vatsana Gupta ◽  
Ashok Singh Rawat ◽  
Sarita Shrivastava ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Water Decontamination ◽  
Nano Zero Valent Iron
Sign in / Sign up

Export Citation Format

Share Document