scholarly journals Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 28918-28930 ◽  
Author(s):  
Li Feng ◽  
Huaili Zheng ◽  
Baoyu Gao ◽  
Shixin Zhang ◽  
Chuanliang Zhao ◽  
...  
Keyword(s):  
Block Structure ◽  
Separation And Purification ◽  
Water Separation ◽  
Template Polymerization ◽  
High Turbidity ◽  
Anionic Polyacrylamide

Ultraviolet (UV)-initiated template polymerization (UTP) was used as a feasible strategy to prepare a novel anionic polyacrylamide (APAM) with a microblock structure.

scholarly journals Nano-structured Cellulose as Green Adsorbents for Water Purification: A Mini Review

2019 ◽  
Vol 23 (2) ◽  
Author(s):  
H. Ibrahim ◽  
N. Sazali ◽  
I. N. Ibrahim ◽  
M. S. Sharip
Keyword(s):  
Water Purification ◽  
Agricultural Waste ◽  
Water Sources ◽  
Water Remediation ◽  
Good Prospect ◽  
Clean Water ◽  
Separation And Purification ◽  
Water Separation ◽  
Wide Range

Celluloses are natural polysaccharides that have garnered attentions in recent years due to their sustainability, availability and notable applications in various fields. Whilst demand of clean water sources keep increasing, modified nano-structured cellulose derived from agricultural waste showed a good prospect in adsorbing pollutants from water. To date, large number of studies have reported the performance of nanocellulose in removing wide range of pollutants from effluents. The purpose of this mini review is to present an overview of existing literatures on the utilization of nanocellulose-based materials as adsorbent for water remediation and make aware of possible development of integrating adsorption and nanotechnology for water separation and purification.

scholarly journals The investigation of the specific behavior of a cationic block structure and its excellent flocculation performance in high-turbidity water treatment

RSC Advances ◽  
2018 ◽  
Vol 8 (27) ◽  
pp. 15119-15133 ◽  
Author(s):  
Li Feng ◽  
Huaili Zheng ◽  
Xiaomin Tang ◽  
Xinyu Zheng ◽  
Shuang Liu ◽  
...  
Keyword(s):  
Water Treatment ◽  
High Efficiency ◽  
Block Structure ◽  
Specific Behavior ◽  
Cationic Polyacrylamide ◽  
High Turbidity

The fabrication of a cationic polyacrylamide (CPAM) with high efficiency and economy has been highly desired in the field of high-turbidity water treatment.

Nanocomposite membranes for water separation and purification: Fabrication, modification, and applications

2019 ◽  
Vol 213 ◽  
pp. 465-499 ◽  
Author(s):  
Milad Rabbani Esfahani ◽  
Sadegh Aghapour Aktij ◽  
Zoheir Dabaghian ◽  
Mostafa Dadashi Firouzjaei ◽  
Ahmad Rahimpour ◽  
...  
Keyword(s):  
Separation And Purification ◽  
Nanocomposite Membranes ◽  
Water Separation

scholarly journals Graphene Oxide Membranes for High Salinity, Produced Water Separation by Pervaporation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 475
Author(s):  
Khalfan Almarzooqi ◽  
Mursal Ashrafi ◽  
Theeran Kanthan ◽  
Ali Elkamel ◽  
Michael A. Pope
Keyword(s):  
Graphene Oxide ◽  
Produced Water ◽  
High Salinity ◽  
Pure Water ◽  
Naphthenic Acid ◽  
Separation And Purification ◽  
Case Scenario ◽  
Worst Case ◽  
Water Separation ◽  
Water Emulsion

Oil and gas industries produce a huge amount of wastewater known as produced water which contains diverse contaminants including salts, dissolved organics, dispersed oils, and solids making separation and purification challenging. The chemical and thermal stability of graphene oxide (GO) membranes make them promising for use in membrane pervaporation, which may provide a more economical route to purifying this water for disposal or re-use compared to other membrane-based separation techniques. In this study, we investigate the performance and stability of GO membranes cast onto polyethersulfone (PES) supports in the separation of simulated produced water containing high salinity brackish water (30 g/L NaCl) contaminated with phenol, cresol, naphthenic acid, and an oil-in-water emulsion. The GO/PES membranes achieve water flux as high as 47.8 L m−2 h−1 for NaCl solutions for membranes operated at 60 °C, while being able to reject 99.9% of the salt and upwards of 56% of the soluble organic components. The flux for membranes tested in pure water, salt, and simulated produced water was found to decrease over 72 h of testing but only to 50–60% of the initial flux in the worst-case scenario. This drop was concurrent with an increase in contact angle and C/O ratio indicating that the GO may become partially reduced during the separation process. Additionally, a closer look at the membrane crosslinker (Zn2+) was investigated and found to hydrolyze over time to Zn(OH)2 with much of it being washed away during the long-term pervaporation.

The Moving-IAT

2017 ◽  
Vol 33 (6) ◽  
pp. 445-452
Author(s):  
Monika Fleischhauer
Keyword(s):  
Internal Consistency ◽  
Personality Assessment ◽  
Block Structure ◽  
Mental Representations ◽  
Indirect Measures ◽  
Attitude Research ◽  
Self Reports ◽  
Implicit Personality ◽  
Single Block ◽  
Psychometric Quality

Abstract. Accumulated evidence suggests that indirect measures such as the Implicit Association Test (IAT) provide an increment in personality assessment explaining behavioral variance over and above self-reports. Likewise, it has been shown that there are several unwanted sources of variance in personality IATs potentially reducing their psychometric quality. For example, there is evidence that individuals use imagery-based facilitation strategies while performing the IAT. That is, individuals actively create mental representations of their person that fit to the category combination in the respective block, but do not necessarily fit to their implicit personality self-concept. A single-block IAT variant proposed by attitude research, where compatible and incompatible trials are presented in one and the same block, may prevent individuals from using such facilitation strategies. Consequently, for the trait need for cognition (NFC), a new single-block IAT version was developed (called Moving-IAT) and tested against the standard IAT for differences in internal consistency and predictive validity in a sample of 126 participants. Although the Moving-IAT showed lower internal consistency, its predictive value for NFC-typical behavior was higher than that of the standard IAT. Given individual’s strategy reports, the single-block structure of the Moving-IAT indeed reduces the likelihood of imagery-based strategies.

Matching Design of Tram Flexible Block Structure and Material

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Wanqing Zhang ◽  
Jinyan Zhu ◽  
Ying Cheng ◽  
Chen Liu ◽  
Rongchun Shi
Keyword(s):  
Block Structure ◽  
Matching Design

SEAGRESS COVERAGE AND ECOSYSTEM CONDITION AT THE COASTAL AREA OF MADASANGER, JELENGA AND MALUK, WEST SUMBAWA

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Erny Poedjirahajoe ◽  
Ni Putu Diana Mahayani ◽  
Boy Rahardjo Sidharta ◽  
Muhamad Salamuddin
Keyword(s):  
Coastal Area ◽  
Seagrass Species ◽  
Seagrass Bed ◽  
Water Turbidity ◽  
Transect Sampling ◽  
Sampling Points ◽  
Ecosystem Condition ◽  
High Turbidity ◽  
Line Transects ◽  
Seagrass Coverage

The increase of temperature might affect the distribution and reproduction of seagrass. This research aims to determine the seagrass bed coverage and the ecosystem condition. Three line transects were established perpendicular to the coastal line with the distance of 50-100 m, or up to the border of the intertidal area. In each transect, sampling points were determined with a distance of 10-20 m. At the sampling points, a plot of 50 cm x 50 cm was established to measure the coverage percentage of seagrass vegetation. The seagrass species were also observed and recorded along the line transects. The percentage of seagrass coverage was measured using a method from Saito and Atobe (1994). The results showed that the coastal area of Jelenga has the highest percentage of seagrass coverage (>60%, healthy) among other coastal areas. This may be caused by the characteristic of Jelenga coast which was relatively calm, few visitors, low water turbidity, and high light penetration. While, other transects have percentage coverage of less than 60% (less healthy). There was one transect on Maluk coast which has coverage percentage of less than 29% (lack of seagrass species). The small coverage percentage on Maluk coast can be caused by the high number of visitors and high activity of fishing boats around the coast which results in high turbidity. Keywords: coverage, ecosystem condition, seagrass bed, west Sumbawa.

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