scholarly journals Improved Dye Removal Ability of Modified Rice Husk with Effluent from Alkaline Scouring Based on the Circular Economy Concept

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 653 ◽  
Author(s):  
Nina Mladenovic ◽  
Petre Makreski ◽  
Anita Tarbuk ◽  
Katia Grgic ◽  
Blazo Boev ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Rice Husk ◽  
Circular Economy ◽  
Energy Efficient ◽  
Dye Removal ◽  
Plant Fibers ◽  
Environment Friendly ◽  
Pre Treatment ◽  
Colored Wastewater ◽  
Red Dye

To improve the ability of the rice husk to purify colored wastewater, effluent from the alkaline scouring of cotton yarn was used immediately after the scouring (without cooling and additionally added chemicals) in order to remove the non-cellulosic silicon-lignin shield from the rice husk’s surface. This rice husk, with 93.8 mg/g adsorption capacity, behaves similarly as the rice husk treated with an optimized alkaline scouring recipe consisting of 20 g/L NaOH, 2 mL/L Cotoblanc HTD-N and 1 mL/L Kemonecer NI at 70 °C for 30 min with an adsorption capacity of 88.9 mg/g of direct Congo red dye. Treating one form of waste (rice husk) with another (effluent from the alkaline scouring of cellulosic plant fibers), in an effort to produce a material able to purify colored effluent, is an elegant environment-friendly concept based on the circular economy strategy. This will result in a closed-loop energy-efficient process of the pre-treatment of cotton (alkaline scouring), modification of rice husk using effluent from the alkaline scouring, dyeing cotton fabrics and cleaning its colored effluents with modified rice husk without adding chemicals and energy for heating.

Enhanced Congo red dye removal from aqueous solutions using iron nanoparticles: adsorption, kinetics, and equilibrium studies

2017 ◽  
Vol 46 (44) ◽  
pp. 15470-15479 ◽  
Author(s):  
Se-Ho Kim ◽  
Pyuck-Pa Choi
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Congo Red ◽  
Iron Nanoparticles ◽  
Dye Removal ◽  
Ambient Conditions ◽  
Equilibrium Studies ◽  
Amorphous Iron ◽  
Red Dye

Congo red adsorption tests reveal that the highest adsorption capacity (1735 mg g−1) is achieved for amorphous iron nanoparticles synthesized under ambient conditions.

scholarly journals Circular economy approach for rice husk modification: Equilibrium, kinetic, thermodynamic aspects and mechanism of Congo red adsorption

2021 ◽  
Author(s):  
Nina Mladenovic ◽  
Jovana Petkovska ◽  
Vesna Dimova ◽  
Dejan Dimitrovski ◽  
Igor Jordanov
Keyword(s):  
Rice Husk ◽  
Circular Economy ◽  
Congo Red ◽  
Textile Industry ◽  
Physical Nature ◽  
Order Kinetic ◽  
Red Rice ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Pre Treatment

Abstract Equilibrium, kinetic, thermodynamic aspects and mechanism of Congo red adsorption onto rice husk treated with effluent from cotton pre-treatment are examined by altering the initial dye concentration, contact time, temperature, and adsorbent mass. When a lower mass is applied, the treated rice husk adsorbs the Congo red following the Langmuir model, while at a higher mass, the adsorption follows the Freundlich model. А maximum of 149.1 mg/g Congo red is adsorbed with 10 g/L rice husk at 70oC. This capacity of the chemically modified rice husk is one of the better ones found in the literature. The calculated Dubinin–Radushkevich activation energy indicates the physical nature of Congo red adsorption adsorbed under the pseudo-second-order kinetic model. The thermodynamic analysis confirmed spontaneous and endothermic adsorption with physically created Congo red-rice husk bonds. These results showed the applicability of the circular economy concept in the effort to obtain an efficient adsorbent without wasting additional chemicals and energy that could be used to create a continuous column-mode process of rice husk modification and purification of colored effluent from the textile industry.

scholarly journals Removal of acidic Yellow Dye of wastewater by Moringa Peregrina

2020 ◽  
Author(s):  
negar saraei ◽  
Mostafa Tizghadam Ghazani
Keyword(s):  
Dye Removal ◽  
Adsorption Process ◽  
Test Results ◽  
Optimal Model ◽  
Order Model ◽  
Environment Friendly ◽  
Pseudo Second Order ◽  
Moringa Peregrina ◽  
Colored Wastewater ◽  
Complex Parts

Abstract Industrial textile treatment is one of the most important and complex parts of wastewater treatment. Absorption is considered a desirable method in separating pollutants and dyes from water. In this study, the effectiveness of Moringa Peregrina seeds as a natural, non-toxic, and environment-friendly adsorbent in the treatment of colored wastewater has been investigated. First, the isotherm model and absorption kinetics were investigated, and then influential variables such as major and minor factors in the absorption process were identified. During the experiment, the amount of dye removal efficiency was measured by a spectrophotometer. Optimization of three important factors including color concentration, pH, and adsorbent dosage was done using the design of the composite central method, the response surface in the Design-Expert software. The optimal model for describing the adsorption process, the Freundlich and the pseudo-second-order model are obtained as a result and the adsorption capacity of moringa peregrina is 22.85 mg / g. In the end, code 19 acidic yellow dye with a concentration of 250 mg/L, pH = 8, and adsorbent in the amount of 0.875 g was purified to 80% of an aqueous solution. The results were obtained under constant conditions with a mixing speed of 200 rpm and a duration of 60 minutes with a reliability of 0.93. According to the test results, on average, Moringa Peregrina is effective in removing pigments from aqueous solutions under the mentioned conditions.

Adsorption and Catalysis of Orange II from Wastewater by Inorganic-Organic-Bentonite

2011 ◽  
Vol 340 ◽  
pp. 236-240
Author(s):  
Jian Feng Ma ◽  
Jian Ming Yu ◽  
Bing Ying Cui ◽  
Ding Long Li ◽  
Juan Dai
Keyword(s):  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Dye Removal ◽  
Maximum Adsorption Capacity ◽  
Orange Ii ◽  
Acid Dye ◽  
Secondary Pollution ◽  
Organic Bentonite ◽  
Maximum Removal

Inorganic-organic-bentonite was synthesized by modification of bentonite by Hydroxy-iron and surfactant, which could be applied in dye removal by adsorption and catalysis. The removal of acid dye Orange II was studied at various factors such as time and pH of solution. The results showed that the inorganic-organic-bentonite could efficiently remove the dye with efficiency of 96.22%. The maximum adsorption capacity is 76 mg/g. The pH of solution has significant effect on both adsorption and catalysis. When pH was 4, the maximum removal efficiency of adsorption and catalysis were 97.57% and 87.23%, respectively. After degradation, the secondary pollution was diminished and the bentonite could be reused.

scholarly journals Spent Coffee Ground as Low-Cost Adsorbent for Congo Red Dye Removal from Aqueous Solution

2021 ◽  
Vol 765 (1) ◽  
pp. 012089
Author(s):  
R Taufik ◽  
M Mohamad ◽  
R Wannahari ◽  
N F Shoparwe ◽  
WHW Osman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Dye Removal ◽  
Low Cost ◽  
Congo Red Dye ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
Red Dye

scholarly journals Investigation of Dye Removal Capability of Blast Furnace Slag in Wastewater Treatment

2021 ◽  
Vol 13 (4) ◽  
pp. 1970
Author(s):  
Sara Yasipourtehrani ◽  
Vladimir Strezov ◽  
Tao Kan ◽  
Tim Evans
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Industrial Wastewater ◽  
Dye Removal ◽  
Treatment Time ◽  
Activated Carbons ◽  
Industrial Applications ◽  
Ore Processing ◽  
Pre Treatment ◽  
Furnace Slag

Blast Furnace Slag (BFS) is a by-product of the iron ore processing industry with potential to be used in different industrial applications. In this research, BFS was used to examine its ability for dye removal from wastewater. The efficiency of two types of BFS samples for removal of cationic methylene blue (MB) and acidic methyl orange (MO) dyes was investigated and results found that the optimal conditions for treatment of wastewater were 80 g/L of adsorbent dose and 1 h of treatment time for both dyes. BFS was found to be more effective for removal of the acidic MO dye than the cationic MB dye. Under shorter residence times, the results showed reverse trends with BFS samples removing higher concentrations of MB than MO. The BFS chemistry had additional impacts on the efficiency of dye removal. Higher basicity of BFS had lower dye removal ability for adsorption of acidic dye when applied at smaller concentrations, while for cationic dye when applied at higher concentrations. The results showed that BFS has potential role for pre-treatment of industrial wastewater contaminated with dyes and may contribute to reduced use of more expensive adsorbents, such as activated carbons.

Opportunities and Challenges in Perovskite LEDs Commercialization

2021 ◽  
Author(s):  
Kai Zhang ◽  
Ningning Zhu ◽  
Mingming Zhang ◽  
Lei Wang ◽  
Jun Xing
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Light Emitting Diode ◽  
Environment Friendly ◽  
Light Emitting ◽  
Lighting Technology

Recently, the light-emitting diode (LED) has been considered as an energy-saving and environment-friendly lighting technology，which is ten times more energy efficient than conventional incandescent lights. As an emerging photoelectric material,...

Metal salt-modified biochars derived from agro-waste for effective congo red dye removal

2021 ◽  
pp. 111492
Author(s):  
Dang Le Tri Nguyen ◽  
Quach An Binh ◽  
Xuan Cuong Nguyen ◽  
Thi Thanh Huyen Nguyen ◽  
Quang Nha Vo ◽  
...  
Keyword(s):  
Congo Red ◽  
Dye Removal ◽  
Metal Salt ◽  
Congo Red Dye ◽  
Red Dye

scholarly journals Optimization of cadmium(II) adsorption onto modified and unmodified lignocellulosics (rice husk and egussi peeling)

2015 ◽  
Vol 5 (1) ◽  
pp. 45
Author(s):  
Tchuifon Tchuifon Donald Raoul ◽  
Nche George Ndifor-Angwafor ◽  
Ngakou Sadeu Christian ◽  
Kamgaing Théophile ◽  
Ngomo Horace Manga ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Rice Husk ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Batch Technique ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Adsorbed Quantity ◽  
Minimal Mass ◽  
Modified Adsorbents

<p>The present study is based on the adsorption of cadmium (II) ions on rice husk and egussi peeling, unmodified and modified with nitric acid in aqueous solution, using batch technique. It was carried out as a function of contact time, dosage, pH and initial concentration. The equilibrium time was achieved within 25 minutes for unmodified rice husk (Glu NT) and 20 minutes for unmodified egussi peeling (Cuc NT) with an adsorbed quantity of 13.18 mg/g. In the case of modified materials, we obtained 15 minutes for modified rice husk (Glu HNO3) and 10 minutes for modified egussi peeling (Cuc HNO3) with an adsorbed quantity of 18.77 mg/g. The maximum biosorption occurred at pH 5.5 for all biosorbents. The adsorbent mass for maximum adsorption was 0.4 g giving an adsorption capacity of 62.02 % for unmodified adsorbents. In the case of modified adsorbents, the minimal mass at which maximum adsorption occurred was 0.4 g giving an adsorption capacity of 98.33 % and 0.6 g giving an adsorption capacity of 98.33 % for modified rice husk and egussi peeling respectively. The adsorbent/adsorbate equilibrium was well described by the pseudo-second order kinetic model and by Langmuir’s and Freundlich adsorption model. This models showed that the adsorption of cadmium (II) is a chemisorption process.</p>

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