scholarly journals Mesoporous Composite Materials from Acivated Rice Husk Carbon and Montmorillonite

2010 ◽  
Vol 13 (1-2) ◽  
pp. 105 ◽  
Author(s):  
J.M. Jandosov ◽  
Z.A. Mansurov ◽  
M.A. Biisenbayev ◽  
A.R. Kerimkulova ◽  
Z.R. Ismagilov ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Composite Materials ◽  
Rice Husk ◽  
Nitrogen Adsorption ◽  
Steam Activation ◽  
Mesoporous Composite ◽  
Adsorption Study ◽  
Study Results ◽  
Using Data ◽  
Methylene Blue Number

<p>Three different carbons were prepared from rice husk by steam activation at 700 °C, H<sub>3</sub>PO<sub>4</sub>-activation followed by desilication or desilication followed by H<sub>3</sub>PO<sub>4</sub>-activation at 500 °C. Honeycomb monoliths were obtained by mixing of a carbon with montmorillonite followed by extrusion, curing, calcination and leaching by alkaline solution. Obtained blocks were compared in terms of their morphology and elemental composition using data of SEM/EDX-analysis. From low temperature nitrogen adsorption study results it follows that prepared monoliths are characterized by SBET up to 700 m<sup>2</sup>/g (V<sub>Σ</sub> = 0.79 cm<sup>3</sup>/g) and pore size distribution shows the maximum around 4 nm. Methylene blue number is as high as 250 mg/g.</p>

scholarly journals Comparison Study of Adsorption of Lead and Methylene Blue on Zeolite, Activated Carbon and Their Composite Materials

2019 ◽  
Vol 25 (8) ◽  
pp. 129-148
Author(s):  
Rafie Rushdy Mohammed
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Activated Carbon ◽  
Composite Materials ◽  
Synthesis Method ◽  
Nitrogen Adsorption ◽  
Batch Mode ◽  
Thermally Activated ◽  
Optimum Synthesis ◽  
Pseudo Second Order

In this study, composite materials consisting of Activated Carbon (AC) and Zeolite were prepared for application in the removal of methylene blue and lead from an aqueous solution. The optimum synthesis method involves the use of metakaolinization and zeolitization, in the presence of activated carbon from kaolin, to form Zeolite. First, Kaolin was thermally activated into amorphous kaolin (metakaolinization); then the resultant metakaolin was attacked by alkaline, transforming it into crystalline zeolite (zeolitization). Using nitrogen adsorption and SEM techniques, the examination and characterization of composite materials confirmed the presence of a homogenous distribution of Zeolite throughout the activated carbon. It has also shown the carbonization process did not destroy the crystalline structure of the zeolite, which was revealed to be intact. Experiments in batch mode were conducted (using three differently-prepared composites, zeolite and activated carbon), to investigate the removal of methylene blue and lead from the aqueous solution of the sorbents. Key experimental parameters (initial concentration, pH, contact time and adsorbent dosage) from the obtained results were measured and analysed. Freundlich and Langmuir models were used to describe the adsorption isotherms, and the observed adsorption kinetic adhered to pseudo-second order.  

scholarly journals Synthesis, Morphostructure, Surface Chemistry and Preclinical Studies of Nanoporous Rice Husk-Derived Biochars for Gastrointestinal Detoxification

2017 ◽  
Vol 19 (4) ◽  
pp. 303 ◽  
Author(s):  
J.M. Jandosov ◽  
L.I. Mikhalovska ◽  
C.A. Howell ◽  
D.I. Chenchik ◽  
B.K. Kosher ◽  
...  
Keyword(s):  
Rice Husk ◽  
Uv Spectroscopy ◽  
In Vitro Study ◽  
Nitrogen Adsorption ◽  
In Vivo Studies ◽  
Nanostructured Carbon ◽  
Carbon Sorbents ◽  
Study Results

This article summarizes the methodology of synthesis, surface functionalization and structural properties of rice husk-derived nanostructured carbon enterosorbents (biochars) in connection with the preliminary in vitro study results of uraemic toxin adsorption in model experiments, as well as preclinical trials in vivo. The obtained nanostructured carbon sorbents were studied using a number of modern physicochemical methods of investigation: low-temperature nitrogen adsorption, isotherms recording and calculation of the specific surface area, pore volumes were carried out using the Autosorb-1 "Quantachrome" device. Scanning electron microscopy and EDS-analysis. Mercury intrusion porosimetry analysis of the ACs were accomplished using "Quantachrome Poremaster" data analysis software. In vitro adsorption results assessed by use of HPLC and UV-spectroscopy for the nanostructured carbon sorbents with respect to the investigated low-molecule toxins suggest that the rice husks-derived carbon enterosorbents modified with the functional groups are able to reduce clinically significant levels of uraemic toxins and are comparable to the commercial enterosorbents. Based on the results of the comparative analysis for biocompatibility of canine kidney epithelial cells it was determined that the samples of the modified sorbents CRH-P-450 and CRH-475-KOH-850-N do not exhibit cytotoxicity in comparison with the commercial carbon enterosorbent «Adsorbix Extra». According to the results of the in vivo studies, it was determined that there was a positive effect of the enterosorbent CRH-P-450 on uremia and intoxication.

Role Stress and Sense of Control Predict Using Food to Cope With Stress in Midlife Women

2021 ◽  
pp. 089826432110110
Author(s):  
Dana R. Riedy ◽  
Ashley MacPherson ◽  
Natalie D. Dautovich
Keyword(s):  
Work Stress ◽  
Underlying Mechanism ◽  
The United States ◽  
Role Stress ◽  
Work And Family ◽  
Midlife Women ◽  
Sense Of Control ◽  
Study Results ◽  
Using Data ◽  
Significant Mediator

Objective: The current study examined the association between role stress and using food to cope with stress in midlife women and examined sense of control as a potential underlying mechanism. Methods: An archival analysis was performed using data from 638 midlife women from the Midlife in the United States II study. Results: Hierarchical linear regression analyses demonstrated that work stress (β = .180, p < .001) and family stress (β = .138, p < .05) significantly predicted using food to cope with stress. Sense of control was a significant mediator between work stress and using food to cope with stress ( b = 0.02, 95% CI [.0014, .0314]). Discussion: Midlife women with higher role stress related to work and family are more likely to use food to cope with stress, and sense of control seems to be the link between work stress and using food to cope.

“I Would Report It Even If They Have Not Committed Anything”: Social Service Students’ Attitudes Toward Minor-Attracted People

Sexual Abuse ◽  
2021 ◽  
pp. 107906322199348
Author(s):  
Allyn Walker ◽  
Robert P. Butters ◽  
Erin Nichols
Keyword(s):  
Social Service ◽  
Mandated Reporting ◽  
Mental Health Providers ◽  
Health Providers ◽  
Study Results ◽  
Survey Results ◽  
Students Attitudes ◽  
Using Data ◽  
Programs Of Study ◽  
Ethics Courses

This study explores future mental health providers’ assumptions about minor-attracted people, using data from a survey of 200 students preparing for entry into social service professions at a public university in the state of Utah. Survey results show that more than half of the students believe clients who identify themselves as pedophiles must be automatically reported to the police, which has implications for providers’ understandings about the term “pedophile,” as well as their knowledge of guidelines for when clinicians may break client confidentiality. This belief was not significantly affected by taking ethics courses, nor courses that discussed mandated reporting guidelines. Despite this finding, 91% of students did not believe that they would need to report a client who had attractions to children, but who had never committed a sexual offense against a child. The majority of students indicated a willingness to work with minor-attracted clients, and commonly indicated in comments that they wanted more information about MAPs and when to break client confidentiality in their programs of study. Study results indicate a need for education among social service students about these issues.

Direct production of biodiesel from crude Euphorbia lathyris L. Oil catalyzed by multifunctional mesoporous composite materials

Fuel ◽  
2022 ◽  
Vol 309 ◽  
pp. 122172
Author(s):  
Hu Pan ◽  
Qineng Xia ◽  
Hu Li ◽  
Yangang Wang ◽  
Zhangfeng Shen ◽  
...  
Keyword(s):  
Composite Materials ◽  
Mesoporous Composite ◽  
Direct Production ◽  
Euphorbia Lathyris

Are atheist consumers less ethical? Investigating the role of religiosity and atheism on consumer ethics

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Denni Arli ◽  
Tuyet-Mai Nguyen ◽  
Phong Tuan Nham
Keyword(s):  
Consumer Ethics ◽  
Intrinsic Religiosity ◽  
Content Type ◽  
Ethical Behaviors ◽  
Segmentation Analysis ◽  
Study Results ◽  
Unethical Behaviors ◽  
The Usa ◽  
Using Data ◽  
The Impact

Purpose There is a perception that non-religious consumers are less ethical than religious consumers. Studies found prejudices against atheists around the world and assumed that those who committed unethical behavior were more likely to be atheists. Hence, first, the purpose of this study is to investigate the effect of consumers’ intrinsic religiosity, extrinsic religiosity and atheism on consumers’ ethical beliefs. Second, this study attempts to segment consumers and identify differences between these segments. Design/methodology/approach Using data from 235 study participants in the USA and 531 in Vietnam. Subsequently, a two-step cluster approach was used to identify segments within these samples. Findings The study results show consumers’ intrinsic religiosity negatively influences all consumers’ unethical beliefs. Similarly, atheism also negatively influences all consumers’ unethical beliefs. This study also complements other studies exploring consumer ethics in developing countries. In addition, the segmentation analysis produced unique segments. The results from both samples (USA and Vietnam) indicated that non-religious consumers are less likely to accept various unethical behaviors compared to religious consumers. Religious consumers are not necessarily more ethical and atheism consumers are not necessarily less ethical. In the end, are implications for business ethics, religious and non-religious leaders on how to view the impact of beliefs on consumer ethical behaviors. Originality/value This is one of the first few studies investigating the impact of atheism on consumer ethics. The results of this study further extend the knowledge of study in consumer ethics by comparing consumers’ religiosity and atheism.

scholarly journals Methylene blue improves hemodynamic shock but increases lipoperoxidation in severe acute pancreatitis pig model

2008 ◽  
Vol 23 (suppl 1) ◽  
pp. 8-16 ◽  
Author(s):  
Roberto Ferreira Meirelles Jr ◽  
Reginaldo Ceneviva ◽  
Fernanda Viaro ◽  
Caroline Floreoto Baldo ◽  
Paulo Roberto Barbosa Evora
Keyword(s):  
Methylene Blue ◽  
Acute Pancreatitis ◽  
Bolus Dose ◽  
Serum Amylase ◽  
Tissue Perfusion ◽  
Pancreatic Tissue ◽  
Control Group ◽  
Hemodynamic Pattern ◽  
Study Results ◽  
Over Time

PURPOSE: Study hemodynamic pattern and lipoperoxidation during methylene blue (MB) treatment on taurocholate - enterokinase induced acute pancreatitis (AP). METHODS: Thirty pigs were equally divided in control group; MB group; AP group; MB previous AP group; and MB after 90 min of induced AP group. MB was given iv in a bolus dose (2mg.kg-1) followed by maintenance dose (2 mg.kg-1.h-1). Hemodynamic parameters were recorded continuously during 180 min by Swan-Ganz catheter. Blood samples were taken every 60 min to determine arterial and venous nitrate, malondialdehyde (MDA) and amylase. Pancreatic tissue was removed for histopathologic study. RESULTS: In AP group MBP and CO decreased over time 33% (p<0.05) and 52% (p<0.05), respectively. In MB previous induced-AP group, there was 70 minutes delay (p<0.05) to decrease MBP and CO. In MB group arterial and venous nitrite decreased (p<0.05) over time. MB infusion increased (p>0.05) serum MDA when associated to AP. After induced AP, MB did not reverse MBP and CO decrease. There was no difference in serum amylase and necro-hemorrhagic findings with MB treatment. CONCLUSIONS: In this taurocholate-induced AP model MB treatment delayed hemodynamic shock and decreases serum nitrate levels but increases serum MDA levels. No volemic replacement was done and it may have been a mitigated factor to a poor tissue perfusion and impairment microcirculation. Further investigations are needed to elucidate MB treatment role during AP treatment.

Empirical Equilibrium Study on Rice Husk and Eggshells as Low Cost Bioadsorbent for the Methylene Blue Removal

2014 ◽  
Vol 699 ◽  
pp. 221-226
Author(s):  
Nurul Hanim Razak ◽  
Md. Razali Ayob ◽  
M.A.M. Zainin ◽  
M.Z. Hilwa
Keyword(s):  
Methylene Blue ◽  
Rice Husk ◽  
Low Cost ◽  
Agricultural Waste ◽  
Textile Wastewater ◽  
Blue Dye ◽  
Rice Husks ◽  
Equilibrium Study ◽  
Porosity Characterization

Eggshells and rice husk, two types of notable agricultural waste were used as bioadsorbent to remove Methylene Blue dye (MBD) in aqueous solution. This study was to investigate the performance of these two bioadsorbents in removing MBD. The removal percentage, adsorption capacity, and porosity characterization were examined. The method applied was a physical filtration. UV-VIS Spectrophotometer was used to determine the efficiency of the bioadsorbents in MBD adsorption. The highest removal percentage at the most concentrated MBD were 51% and 98% for eggshells and rice husks respectively. Meanwhile the characterization of rice husks pore size and volume proves that higher adsorptivity towards dye compares to eggshells porosity. It was concluded that the eggshells and rice husks bioadsorbents was successful to treat industrial textile wastewater with rice husks as the most efficient bioadsorbent in removing MBD.

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