scholarly journals ADSORPTION STUDY OF CRYSTAL VIOLET AND MALACHITE GREEN DYES IN ZEOLITIC MATERIAL

2019 ◽  
Vol 16 (33) ◽  
pp. 70-81
Author(s):  
M. A. KLUNK ◽  
S. DASGUPTA ◽  
M. DAS ◽  
P. R. WANDER ◽  
Z. SHAH
Keyword(s):  
Malachite Green ◽  
Crystal Violet ◽  
Molecular Sieves ◽  
Textile Industry ◽  
Textile Effluents ◽  
Violet Crystal ◽  
Toxic Agents ◽  
Zeolitic Material ◽  
Synthetic Solution ◽  
Efficient Alternative

Violet crystal and malachite green are dyes used in the textile industry. These organic compounds are toxic agents capable of polluting water resources as well as destroying the existing biota in this location. The decolorization of textile effluents has always been a global problem, but it has accentuated over time with increasing scale operation and changes in the origin of the dyes used. Decolorization of wastewater achieved by physically removing the dye from the water or by destroying its chromophore group. Adsorption is referred to as one of the most efficient and feasible methods for discoloring an effluent. Molecular sieves (zeolites) showed to be an efficient alternative in the discoloration of textile effluents when compared to other processes in the industry. Sodalite is a zeolite that has the ability to adsorb the azo functional groups related to color. The focus of this work is to use sodalite in the process of discoloration of a synthetic solution of crystal violet and malachite green. The experiments performed by varying the contact times between the zeolitic material and the synthetic solutions of the dyes. The results revealed that both dyes had a decolorization process. According to analyzes, greater times of contact (12, 24, 48, and 72 hours) with sodalite is more efficient in the removal color. A decisive factor in this process is the higher Si/Al ratio (2.5) of sodalite that potentiates the process and efficiency of the experiments.

scholarly journals SYNTHESIS OF SODALITE ZEOLITE TO TREATMENT OF TEXTILE EFFLUENTS

2019 ◽  
Vol 16 (31) ◽  
pp. 778-783
Author(s):  
Marcos Antonio KLUNK ◽  
Sudipta DASGUPTA ◽  
Bruno Vinicius Gomes NUNES ◽  
Paulo Roberto WANDER
Keyword(s):  
Molecular Sieves ◽  
Textile Industry ◽  
Dye Adsorption ◽  
Exchange Capacity ◽  
Textile Dye ◽  
X Ray Diffraction ◽  
Textile Effluents ◽  
Violet Crystal ◽  
Effective Removal ◽  
Dye Industry

Textile dye industry causes environmental impacts due to inappropriate disposal of effluents. Several processes have been studied to effective treatment in the dye removal, one of the main molecular sieves (zeolites). The zeolite material, especially sodalite, has the ability to adsorb the metals and functional chromophore groups. Therefore, the sodalite has characteristics that have attention to the scientific community for the treatment of textile effluents. The aim of this work was to synthesize and evaluate the use of sodalite zeolite in four Si/Al ratios (1.0, 1.5, 2.0 and 2.5) and to test the adsorption capacity in the presence of violet crystal textile dye. As result, the synthesized zeolites presented a characteristic that places them in the adsorbent materials. Among the techniques used for characterization, we have the mean pore diameter between 1.65 and 2.07 nm. X-ray diffraction revealed crystalline phases as sodalite zeolite with the presence of kaolinite, mullite, and quartz. Cation-exchange-capacity was between 0.8871 to 1.017 meq/g, where it had a 14.65% increase of the 2.5-SOD sample. The dye adsorption process was reduced to 12% (44 mg/L). Thus, it has concluded that the obtained sodalite zeolites have potential in the effective removal of dyes from the textile industry.

Mutagenicity, cytotoxicity and phytotoxicity evaluation of biodegraded textile effluent by fungal ligninolytic enzymes

2016 ◽  
Vol 73 (10) ◽  
pp. 2332-2344 ◽  
Author(s):  
Muhammad Bilal ◽  
Munawar Iqbal ◽  
Hongbo Hu ◽  
Xuehong Zhang
Keyword(s):  
Textile Industry ◽  
Oxygen Demand ◽  
Ligninolytic Enzymes ◽  
Textile Wastewater ◽  
Treatment Technique ◽  
Textile Effluents ◽  
State Culture ◽  
Global Issue ◽  
Toxic Agents ◽  
Before And After

Colored effluents from the textile industry have led to severe environmental pollution, and this has emerged as a global issue. The feasibility of ligninolytic enzymes for the detoxification and degradation of textile wastewater was investigated. Ganoderma lucidum crude ligninolytic enzymes extract (MnP 717.7, LiP 576.3, and Laccase 323.2 IU/mL) was produced using solid-state culture using wheat bran as substrate. The biodegradation treatment efficiency was evaluated on the basis of degradation and detoxification of textile effluents. Standard bioassays were employed for mutagenicity, cytotoxicity and phytotoxicity evaluation before and after biodegradation. The degradation of Masood Textile, Kalash Textile, Khyber Textile and Sitara Textile effluents was achieved up to 87.29%, 80.17%, 77.31% and 69.04%, respectively. The biochemical oxygen demand, chemical oxygen demand, total suspended solids and total organic carbon were improved considerably as a result of biodegradation of textile effluents, which were beyond the permissible limits established by the National Environmental Quality Standards before treatment. The cytotoxicity (Allium cepa, hemolytic, Daphnia magna and brine shrimp), mutagenicity (Ames TA98 and TA100) and phytotoxicity (Triticum aestivum) tests revealed that biodegradation significantly (P < 0.05) detoxifies the toxic agents in wastewater. Results revealed that biodegradation could possibly be used for remediation of textile effluents. However, detoxification monitoring is crucial and should always be used to evaluate the bio-efficiency of a treatment technique.

scholarly journals Detection of Triphenylmethane Drugs in Fish Muscle by Surface-Enhanced Raman Spectroscopy Coupled with Au-Ag Core-Shell Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Lu Pei ◽  
Yiqun Huang ◽  
Chunying Li ◽  
Yuanyuan Zhang ◽  
Barbara A. Rasco ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Malachite Green ◽  
Crystal Violet ◽  
Bimetallic Nanoparticles ◽  
Limit Of Detection ◽  
Fish Muscle ◽  
Surface Enhanced Raman Spectroscopy ◽  
Vis Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Silver-coated gold bimetallic nanoparticles were synthesized and used as substrates for surface-enhanced Raman spectroscopy (SERS) in detecting prohibited triphenylmethane drugs (including crystal violet and malachite green) in fish muscle. The optical properties and physical properties of bimetallic nanospheres were characterized by UV-Vis spectroscopy and transmission electron microscopy. The optimal nanospheres selected had relatively uniform size (diameter: 33 ± 3 nm) with a silver layer coated on the surface of gold seed (diameter: 18 ± 2 nm). For both crystal violet and malachite green, characteristic SERS spectral features could be identified at concentration as low as 0.1 μg/L with these bimetallic nanospheres. Crystal violet and malachite green residues in fish muscle could also be detected at levels as low as 0.1 ng/g, which could meet the most restricted regulatory requirements for the limit of detection in terms of analytical methods for crystal violet or malachite green in fish muscle. This study provides a basis for applying SERS technology with bimetallic nanoparticles to the identification of trace amounts of prohibited substances in aquatic food products, and the methodology could be extended to analyses of other hazardous chemicals in complex food matrices like vegetables and meats.

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