scholarly journals OPTIMIZATION OF REMOVAL EFFICIENCY AND ABSORPTION CAPACITY OF DYESTUFFS BY ASPERGILLUS SP. USING MANOVA

2021 ◽  
Author(s):  
Semra MALKOÇ ◽  
Berna YAZICI ◽  
Mukaddes ŞİMŞEK
Keyword(s):  
Removal Efficiency ◽  
Absorption Capacity ◽  
Aspergillus Sp

A Novel Approach of Chitosan Additive to Remove Formaldehyde from Building Materials

2011 ◽  
Vol 335-336 ◽  
pp. 1174-1180
Author(s):  
Huang Chin Wang ◽  
Sy Yuan Kang ◽  
Chao Heng Tseng ◽  
Wen Cheng Shau ◽  
Zhi Yang Chen
Keyword(s):  
Removal Efficiency ◽  
Indoor Air ◽  
Building Materials ◽  
Urea Formaldehyde ◽  
Absorption Capacity ◽  
Structural Element ◽  
Carcinogenic Substance ◽  
Novel Approach ◽  
Before And After ◽  
Industrial Standards

Formaldehyde (HCHO) which emitted from building materials, such as plywood and adhesive, is a carcinogenic substance in indoor air. Chitosan is produced from the structural element in the exoskeleton of crustaceans (such as crabs and shrimp), and has the ability to absorb HCHO. In this study, the HCHO removal efficiency by chitosan additives was evaluated for two building materials - adhesive and plywood. The experiments were performed in a small chamber based on the method of Japanese Industrial Standards (JIS) A1901 to evaluate the HCHO emission from adhesive and plywood before and after the application of chitosan additives. Both the HCHO concentration in the chamber and the HCHO emission factor of two adhesives, urea-formaldehyde (UF) resin and Poly Vinyl Acetate (PVAC) resin, were reduced from 0.02~0.21 ppm and 0.12~1.05 mg/m2h to 0~0.14 ppm and 0.12~0.63 mg/m2h after using chitosan additives. The best HCHO removal efficiency was adding 9% chitosan additives in the adhesives. The amount of absorbed HCHO is proportional to the amount of chitosan additives, and approximate 0.02 mg of HCHO can be absorbed by per mg of chitosan additive (i.e. absorption capacity 0.02 g HCHO/g Chitosan).

scholarly journals Evaluation of insoluble xanthate and crosslinked starch-graft-polyacrylamide-co-sodium xanthate for the adsorption of Cu(II) in aqueous solutions

2015 ◽  
Vol 21 (4) ◽  
pp. 465-476
Author(s):  
Jun Tan ◽  
Xiaoyan Wei ◽  
Yuxia Ouyang ◽  
Rui Liu ◽  
Ping Sun ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Copper Ions ◽  
Physical Adsorption ◽  
Freundlich Isotherm ◽  
Absorption Capacity ◽  
Synthetic Wastewater ◽  
Ionic Exchange ◽  
Order Kinetic ◽  
Order Kinetic Model

The effectiveness of insoluble xanthate (ISX) and crosslinked starch-graft-polyacrylamide-co-sodium xanthate (CSAX) for Cu(II) removal from wastewater was evaluated. The two types of xanthates were characterized by SEM, XRD, FTIR, and elemental analysis. Also, the factors influencing adsorption behaviors of copper ions from aqueous solutions were investigated. The results indicated CSAX had higher absorption capacity for Cu(II) than ISX because it contained more N and S. While as far as the removal efficiency was concerned, ISX was better than CSAX for its strong ligand-CSS- groups. The removal efficiency of Cu(II) onto CSAX and ISX increased with the increase in pH. The mechanism for Cu(II) adsorption was ionic exchange for ISX whereas both ion exchange and physical adsorption contributed to adsorption by CSAX. The adsorption kinetics of ISX and CSAX for Cu(II) were favorably described by the pseudo-second-order kinetic model, and the adsorption isotherms were described well with the Freundlich isotherm model. The study with synthetic wastewater showed CSAX was a worthwhile alternative to the traditional ISX only when the wastewater contained both Cu(II) and turbidity.

scholarly journals Cement-Based Solidification/Stabilization of Soil Contaminated by Polycyclic Aromatic Hydrocarbons Using Organophilic Clay

2021 ◽  
Author(s):  
Nima Heidarzadeh ◽  
M. Jebeli ◽  
S. Gitipour
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Removal Efficiency ◽  
Aromatic Hydrocarbons ◽  
Contaminated Soil ◽  
Sem Analysis ◽  
Absorption Capacity ◽  
X Ray Diffraction ◽  
The Matrix ◽  
Polycyclic Aromatic ◽  
Organophilic Clay

Abstract The solidification/stabilization (S/S) method is the most widely used to remediate all types of inorganic pollutants, which has not been developed for organic matters. In this research, the application of cement and organophilic clay (OC) was investigated for the S/S of contaminated soil by polycyclic aromatic hydrocarbons (PAHs). Pyrene, Acenaphthene, Benzo[a]Pyrene, and Benz[a]Anthracene were spiked in a soil specimen. X-ray diffraction analysis (XRD) indicated that OC has a considerable ability to absorb PAHs in its inter-laminar molecular spaces, unlike ordinary bentonite. Toxicity characteristic leaching procedure (TCLP) results showed that application of OC increased PAHs' removal efficiency from contaminated soil up to 80% on average compared to the use of cement only. Samples containing 30% cement and 30% OC with a 14-day curing time had the best removal efficiency. Also, the removal efficiency of heavier PAHs was lower than the lighter ones. Additionally, unconfined compressive strength (UCS) showed a linear descending by increasing OC's proportion. Scanning electron microscopy (SEM) analysis indicated that two reasons have effectively increased the PAHs' removal efficiency of solid samples: a) increasing the amount of OC that increases the PAHs absorption capacity, b) reducing the size of pores in the matrix reduces the pollutant leaching.

scholarly journals Facile 3D Boron Nitride Integrated Electrospun Nanofibrous Membranes for Purging Organic Pollutants

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1383 ◽  
Author(s):  
Dai-Hua Jiang ◽  
Pei-Chi Chiu ◽  
Chia-Jung Cho ◽  
Loganathan Veeramuthu ◽  
Shih-Huang Tung ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Porous Structure ◽  
Removal Efficiency ◽  
Three Dimensional ◽  
Membrane System ◽  
High Heat ◽  
Absorption Capacity ◽  
Enhanced Absorption ◽  
Polymer Nanofiber ◽  
Pure Carbon

Elegant integration of three-dimensional (3D) boron nitride (BN) into the porous structure of a polymer nanofiber (NF) membrane system results in a surface with enhanced absorption capacity for removal. Various BN-based applications were designed and developed successfully, but BN-based absorption systems remain relatively unexplored. To develop a reusable absorption strategy with high removal efficiency, we used a composite of 3D BN and polyacrylonitrile (PAN) to prepare a NF membrane with a porous structure by using electrospinning and spray techniques (BN-PAN ES NFs). The removal efficiency of the 3D BN NF membrane was higher than that of a pure carbon NF membrane. Water pollutants, such as the dyes Congo red (CR), basic yellow 1 (BY), and rhodamine B (Rh B), were tested, and the absorption ratios were 46%, 53%, and 45%, respectively. Furthermore, the aforementioned dyes and pollutants can be completely eliminated and removed from water by heating because of the high heat resistance of 3D BN. The membrane can be recycled and reused at least 10 times. These results indicate that BN-PAN ES NFs have can be used in water purification and treatment for absorption applications, and that they can be reused after heat treatment.

Removal of Phenolic Compounds from Mainstream Cigarette Smoke by Plasticizer

2013 ◽  
Vol 803 ◽  
pp. 142-144
Author(s):  
Sai Bo Yu ◽  
Yong Jin ◽  
Hai Feng Tan ◽  
Qi Liu ◽  
Shi Tai Wang
Keyword(s):  
Phenolic Compounds ◽  
Cellulose Acetate ◽  
Cigarette Smoke ◽  
Removal Efficiency ◽  
Absorption Capacity ◽  
Test Models ◽  
Triethyl Citrate ◽  
Mainstream Cigarette Smoke ◽  
Cellulose Acetate Filter

A series of compounds were applied as plasticizer in the cellulose acetate filter of cigarette. The data showed that the tested filters with proper plasticizers could effectively remove phenolic compounds from mainstream cigarette smoke. In the test models, Triethyl citrate (TEC) exhibited significant absorption capacity to phenolic compounds in cigarette smoke, and the removal efficiency exceeded 49% in contrast to triacetin. Similar result was obtained in different type of cigarette with TEC tips. The removal efficiency of phenolic compounds was significantly affected by the loading of TEC when the loading of TEC was less than 9 wt%. However, when the loading of TEC was between 9-15 wt%, the removal efficiency showed only slight difference.

scholarly journals Treatment of WASTEWATER from the Tannery Industry in a Constructed Wetland Planted with Phragmites australis

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 176 ◽  
Author(s):  
Amalia García-Valero ◽  
Silvia Martínez-Martínez ◽  
Ángel Faz ◽  
Martire Angélica Terrero ◽  
María Ángeles Muñoz ◽  
...  
Keyword(s):  
Phragmites Australis ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Industrial Wastewater ◽  
High Capacity ◽  
Absorption Capacity ◽  
Climatic Conditions ◽  
Batch Mode ◽  
Tannery Industry ◽  
Adsorption Of Nitrogen

Constructed wetlands (CWs) can remove a high amount of pollutants from wastewater, and therefore play an important role in water purification. In this study, a pilot system to improve the traditional treatment of industrial wastewater from the tannery industry was tested. The main objective of this research was to remove nitrogen, phosphorus, boron, and chromium from a tannery’s industrial wastewater using a horizontal subsurface flow constructed wetland (HSSFCW) formed from three cells, planted with Phragmites australis and operated in batch mode as an ecofriendly system. P. australis was selected due to its ability to adapt to climatic conditions, its wetland and management characteristics, and its high capacity for pollutant absorption. The concentrations of total Kjeldahl nitrogen (TKN), total phosphorus (TP), boron (B), and chromium (Cr) were analyzed in both wastewater and purified water, and the removal efficiencies were calculated. In addition, both the absorption capacity of P. australis in the aerial and root parts and the adsorption capacity of substrates (gravel and washed sand) were analyzed. Results showed that the concentrations of TP and Cr decreased in the wastewater at both hydraulic retention times (HRTs) tested (3 and 7 days), with 3 days being the most effective, showing removal efficiency values of 78% and 48% for TP and Cr, respectively. However, concentrations of TKN and B were not statistically reduced at either HRTs. Regarding the absorption capacity of P. australis, the highest absorption efficiencies for TKN and TP were reported at 7 days in the aerial part of the plants. In contrast, B was retained in roots at HRT of 3 days. Finally, Cr was more significantly absorbed at 3 days by P. australis. Moreover, the substrates also played important roles in the adsorption of nitrogen and boron. Therefore, CWs planted with P. australis could be used as an ecofriendly technique to the reduce pollution load of the wastewater from tannery industry, especially for P and Cr, although in order to increase the removal efficiency of B and N, the combination with other plant species and different retention times should be tested.

Search for anti-dengue secondary metabolites from two Diospyros endophytes, Aspergillus sp. and Phomopsis sp

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
LA Peyrat ◽  
V Eparvier ◽  
C Eydoux ◽  
JC Guillemot ◽  
D Stien ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Aspergillus Sp

Degradation of 2,4-dichlorophenol by melamine amine celluloseimmobilized lacasses

TAPPI Journal ◽  
2017 ◽  
Vol 16 (10) ◽  
pp. 559-564 ◽  
Author(s):  
ZHEN WANG ◽  
PINGPING BIN ◽  
YING LIU ◽  
YU LIU ◽  
GUIHUA YANG ◽  
...  
Keyword(s):  
Enzymatic Activity ◽  
Removal Efficiency ◽  
Immobilized Laccase ◽  
Dialdehyde Cellulose

Epoxidized dialdehyde cellulose (EDC) was prepared and grafted with melamine to obtain melamine grafted epoxidized dialdehyde cellulose (EDC-melamine); the products were characterized by various methods and were used as carriers to immobilize laccase. Results show EDC-melamine can immobilize laccase effectively and have higher enzymatic activity compared with EDC. Furthermore, the enzymatic activity of EDC-melamine was found to be as high as 865 U•mg-1, compared with 140U•mg-1 for EDC. The removal efficiency of 2,4-dichlorophenol (2,4-DCP) for EDC-melamine immobilized laccase was about 71.5% at 40°C for 4 h at 10.0 mg•L-1 and dosage of laccase = 0.2 g/L. The removal efficiency can remain greater than 63%, even after six cycles.

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