Synthesis of Mesoporous Silica MCM-41

Synthesis of Mesoporous Silica MCM-41 Results and Discussions The present study included the synthesis of mesoporous silica MCM-41 and its modification by impregnation of different metals on the mesoporous to enhance the photocatalytic activity of metals i.e Cu/MCM-41, Fe/MCM-41, CeO2/MCM-41. FTIR analysis of catalyst MCM-41 has the ability to impregnate numerous metals on its surface. MCM-41 was modified with metal salts in order to dope the metals on the surface of mesoporous material was characterized by FTIR analysis. The FT-IR spectra furnished the information about the incorporation of metals on the surface of MCM-41. The FT-IR spectra of synthesized material in the region of 4000 400 cm-1 in transmission mode using platinium ATR, a single reflection sampling module spectrophotometr, and shown in Fig. 5. The uncalcined MCM41 and calcined MCM41 spectra (Fig. 5A. a, b) show intense band at wavenumber 1100 and 802 cm-1 which accounts for the asymmetric and symmetric stretching of the Si-O-Si bonds, respectively.[i] The bands at 970 cm-1 and 460 cm-1 was assigned to the stretching and bending vibrations of surface Si-O- groups respectively.[ii] The sharp peaks at 2864.72cm-1 and 2922.14 cm-1 were due to the presence of surfactant before calcinations of MCM-41.[iii] For calcined MCM41, the bands at 2852 cm-1 and 2921 cm-1 corresponding to the long chain of alkyl group of the surfactant molecules were disappeared after calcination shows the completely removal of surfactants molecules. The differences of the intensities of the peaks in the FT-IR spectra of MCM-41 and MCM-41/ CeO2, are abserved which resulted from the doping of CeO2. A strong absorption peak at 1,632 cm−1 is observed in the spectra of MCM-41/CeO2, and it indicates the formation of Ce-O-Ce.[iv] About copper and iron also add TGA analysis of MCM-41: XRD analysis of MCM-41: Photocatalytic studies by using the metal dopped MCM-41: The metal dopped MCM-41 was studied for the photocatalytic degradation of commonly used pharmaceutics including salts of diclofenac (non-steroidal anti-inflammatory drug (NAID)) and atorvastatin (antihyper lipoproteinemic drug). For this purpose the solutions od these drugs were prepared and degradation potential of metal dopped mesoporous silicate was studied by optimizing various parameters i.e the amount of catalyst, the pH, the light, substrate concentration, metal loading on MCM-41. Effect of pH The interaction between the pharmaceutics and metal dopped mesoporous are dependent on the pH of the solution therefore the optimization of pH is important to achieve maximum degradation efficiency. During the present study, the degradation process was optimized by changing the pH from 3.5 to 10.5 over 10 wt% M/MCM-41(M= Cu, Fe, Ce) with 1 g l_1 of 0.114 mM drug solution. The pH of the pharmaceutic solution is adjusted with 0.1 M HCl and 0.1 M NaOH. The results obtained are shown in Fig. 3d. At acidic pH, the rate of degradation is faster as compared to high and neutral pH. The results clearly show that acidic pH is ideal for the degradation of the pharmaceutics. Effect of light intensity on degradation of pharmaceutic: The photolysis of pharmaceutic was studied under UV irradiation and dark. The log natural decay curves (In Ct/Co) of pharmaceutic versus irradiation time were displayed in (Fig. 3-5). The data for dark control samples were also elaborated in Fig. 6. Photodegradation of diclofenac sodium and atorvastatin under UV light in distilled water and methanol respectively were determined during the summer season (March-september) as displayed in Fig.3. The determined half life of 50 ppm diclofenac sodium in distilled water under UV light was 2.5h and in dark it was observed as 3 h. The rate of reaction varied from 2.8Ãâ€"10-3 to 2.3Ãâ€"10-3 when pharmaceutic was shifted from UV light to dark. Effect of metal loading on MCM-41 The effect of metal loading over MCM-41 on the photocatalytic activity is investigated and the results are shown in Fig. 2a. The degradation studies are carried out with increase of metal (wt%)5, 10 and 15 using 1 g l_1 of catalyst amount in 50 ml pharmaceutics solution. It is observed that 5–10 wt% increase in metal loadings, the photocatalytic activity increases and there is not much degradation rate at higher loadings. Among all the catalysts, 10 wt% M/MCM- 41 (M= Cu, Fe and Ce) showed most efficient photocatalytic degradation of pharmaceutics i.e., complete degradation within 90 min. The loss in the activity with increase in metal percent loading is due to the excess amount of metal oxide dispersed over MCM-41 that blocks the mesopores results a decrease in adsorption capacity. The turbidity of the solution also blocks penetration of light into the solution. Thus, the metal loading over the support clearly shows that one has to optimize the metal content, simultaneously re taining the active sites for adsorption in order to achieve the effective synergism. Effect of catalyst amount To optimize the amount of catalyst required for effective pharmaceutic photocatalytic degradation, different catalyst amounts (0.25–1.5 g l_1) are studied with 10 wt% M/MCM-41 and the results are shown in Fig. 3a. It is observed that 1.0 g l_1 is found to be the optimum. By increasing 0.25– 1.0 g l_1, the photocatalytic activity is increased and at higher contents the activity is not beneficial. This may be due to the fact that higher amount of the catalyst is obstructing the path of light penetration into the solution (i.e., scattering of light) thus reducing the OH radicals formation. Effect of substrate concentration The effect of 0.094, 0.1571 and 0.2829 mM pharmaceutics concentrations are performed over 10 wt% M/MCM-41 catalyst with 1 g l_1 amount for degradation. From Fig. 3b, it is observed that at lower concentrations, the adsorption is more compared to higher concentrations. There is a slight difference in degradation at 0.094, 0.1571 mM concentrations in comparison to 0.2829 mM. Also, it is acknowledged that the degradation is solely depends on the OH radical formation. The production of OH radicals is not sufficient in comparison to the amount of pharmaceutic adsorbed on the surface of the photocatalyst at higher concentrations. In view of this it suggests that, there should be equilibrium between adsorption of reactant molecules and OH radicals generated from the active sites. The 0.1571 mM concentration of pharmaceutic is found to be optimum for 10 wt% M/MCM-41 catalyst using 1 g l_1 amount. The experimental kinetic data are presented in Fig. 3c (inset) and in Table 1, along with time r equired for 50% degradation (t1/2) for each of the fitted lines. The degradation rate of pharmaceutic is decreased while increasing the concentration. The rate constant ‘k’ decreases with increase in initial concentration of drug. The effect of initial concentration of pharmaceutic on the photocatalytic degradation rate is described by pseudo-first order kinetics. The apparent rate constant for 0.114 mM IPU over 10 wt% TiO2/Al-MCM- 41 catalyst is 0.072 min_1 (R2 = 0.994). In the present investigation, 0.1571 mM concentration is found to be the optimum for degradation studies. [i] E.M. Flanigen, H. Khatami, H.A. Szymanski, (1971), Infrared structural studies of zeolite frameworks. In: E.M. Flanigen, L.B. Sand (Eds.). Molecular Sieve Zeolites. ACS Adv. Chem. Ser., 101: pp 201-227. [ii] E.M. Flanigen, H. Khatami, H.A. Szymanski, (1971), Infrared structural studies of zeolite frameworks. In: E.M. Flanigen, L.B. Sand (Eds.). Molecular Sieve Zeolites. ACS Adv. Chem. Ser., 101: pp 201-227. [iii] Taib, I.N., Endud, S., Katun, M.N Functionalization of mesoporous Si-MCM-41 by grafting with trimethylchlorosilane, International journal of chemistry, 3: 3(2011). [iv] Song, X, Qu, P, Jiang, N, Yang, H, Qiu, G: Synthesis and characterization of MCM-41 materials assembled with CeO2 nanoparticles. Coll. Surf. A Physicochem. Eng. Aspects 313–314, 193–196 (2008)

Explain the Centrality of the Dreaming and Its Importance for Aboriginal Spirituality

Explain the centrality of the Dreaming and its importance for Aboriginal spirituality. The Aboriginal Dreaming refers to the religious and spiritual beliefs of the aboriginal people of Australia. The dreaming is what they base their traditional lives around, the dreaming determines their values and beliefs and their relationships with the animals, plants and environment around them. The Dreaming tells the stories that explain their views and beliefs on how the world came to be and its history and the totems which represent each historical factor of the dreaming. The dreaming stories explain how the Spirit Ancestors made the trees, rocks, waterholes, and rivers, mountains and stars as well as the animals and plants, and which spirits represent each of these things along with the other living features in the land. Views on life and death: The aboriginal people believe that there is no heaven or hell after death they believe that they came from the land and once they die they return to the land. Their belief system is based on past, present and future. The past makes it possible to live in the present, and without the past or present there is no future. There are two types of dreaming: ‘the’ dreaming and ‘my’ dreaming, the dreaming is the history but my dreaming is the connection to a life form or totem eg. Crocodile or eagle which connects ‘my’ dreaming to ‘the’ dreaming because of those totems being symbols in ancient rituals. Dreaming stories: The Dreaming stories are of great importance to the aboriginal people in terms of the dreaming because they are the history books verbally, they tell the stories in detail of how the earth came to be from the ancestors and spirits who created the land who created them. The dreaming stories tell what each spirit was able to create and how it happened for example the rainbow serpent or how the moon got in the sky. These stories have been passed on for millions of generations. These stories were either told by the elders or were found in the aboriginal are of cave painting, these cave paintings had the same effect as the spoken, these traditional art forms also tell a story of how something came to be from the spirits and the ancestors. Rituals and ceremonies: The aboriginal people believe that in performing rituals such as carobories tells stories of the spirits forming into what they represent such as the emu or kangaroo. These sacred dances are performed on the coming of age ceremonies and many other significant occasions. The sites where these ceremonies are performed are sacred and can only be accessed by certain groups, women and elders and only for the purpose of initiation. Aboriginal art: The traditional aboriginal art depicts places, events and dreaming ancestors, also incorporating actual events, whereas the temporary was only for initiation ceremonies and funerals. The aboriginal art opens up ways of communicating the close relationship between the ancestral beings and the laws, views, values, ceremonies and obligations of the people. They enable understanding and knowledge within a community and also partcially the outside world. Connections with the land: The land is the centre of aboriginal spirituality, it is the core of their religion. The land is the people and the people are the land. The land is where they believe the ancestors are. To aboriginals their â€Å"god† is not one singular god up in the sky but many ancestors that are part of the earth and formed and are part of everything natural that is seen today. They believe that the ancestors came through the earth and formed mountains and ridges, rivers and lakes, the sky and the dirt, they are everything and the land is their form of communication with the people, they live in a symbiotic relationship. The land dwells from them and they dwell from the land, they work together to keep the other alive and strong. In conclusion, the centrality of the aboriginal dreaming and its importance to the people is based on the land, the rituals and cerimonies, the understanding that they have a strong relationship with the ancestors and the basis of past, present and future. These are all important because they are the basis of life for the aboriginal people and without this they would not live the traditional lifestyle with all the same customs, they would have no dreaming and no core beliefs that give them the power to respect their land. Resources: Class notes. Previous knowledge. Living religion- third edition. Jannet Movissey, Peter mudge, Adam Taylor, Greg Bailey, Paul Rule. Pearsons education Australia; 2005. Pgs. 11-19.

Black Men and Public Space in America - 1804 Words

Black Men and Public Space: An Agent of Change African-American men and white men are born and raised within the continental U.S.; each of their own faculty empowered to change the social injustice of a society. The innate qualities of the African American do not compare to those of the white man, yet - â€Å"empowered† they are with character. The foundation for the concept –â€Å"character† is best defined as â€Å"holistic,† meaning of physical, mental and social qualities – A. Adler’s school of thought, as well as A. Maslow and C. Rogers’ thoughts –â€Å"[a]n equal human being†¦ cognitive, emotional, and volitional† (Ambrus, 33 -34) Jennifer Ritterhouse, author of Growing Up Jim Crow: How Black and White Southern Children Learned Race, explains that†¦show more content†¦This upward mobility is described by Marlon B. Ross in the article, Manning the Race: Reforming Black Men in the Jim Crow Era; persona â€Å"[a]s a reactive identity overdetermined by the hegemony of white masculinity or as a parallel, if marginalized, cultural formation mimetically patterned on white masculinity.† (Clarke, 456) Staples’ behavior resembles a person who is projecting himself in the direction of upward mobility. The difference is that, unlike the white man, Staples says that he â€Å"[t]akes precautions to make [himself] less threatening.† (231) A parallel to Staples’ upward mobility is a typical young white man at high school projecting masculinity. Related to it is upward mobility mastery in a study by Nicolas W. Proctor. In June 2007, at South West High School in Minneapolis, MN, the counselor for students H-Z had stepped out of his office. Since he was out and the door was open, I waited in his office for him to return. The second person to enter the room was a young ethnic student; she sat down beside me. 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MCDONALD Last Name Meaning and Origin

McDonald is a common Scottish patronymic surname meaning son of Donald, a given name meaning world ruler, from the Gaelic Mac Dhamhnuill. McDonald is probably the most famous of the Scottish clan surnames. In Scotland the McDonald surname derived most often from Scottish settlers who arrived in to the Province of Ulster in the seventeenth century. It may also be an anglicization of MacDomhnall, although the McDonnell or ODonnell spelling is more often seen in that instance. Surname Origin:  Scottish Alternate Surname Spellings: MACDONALD, MCDONNELL, MACDONELL, MCDONNALD Where in the World Is the MCDONALD Surname Found? According to WorldNames public profiler, the McDonald surname is most common in Australia, followed by Ireland and New Zealand. The surname distribution maps at Forebears puts the greatest density of people with the McDonald surname in Grenada, followed by Jamaica, Scotland, the Bahamas, and Australia. In 1881 Scotland, the McDonald surname was most common in Inverness-shire. In 1901, it was the 11th most common surname in County Carlow, Ireland. Famous People with the Surname MCDONALD: Michael McDonald -  American singer and songwriterFreda Josephine McDonald - American entertainer and dancer, best known by her married name Josephine BakerRamsay MacDonald -  first Labor Party prime minister of Great BritainFlora MacDonald -  Jacobite patriot who protected Bonnie Prince Charlie after the Battle of CullodenJohn A. MacDonald - first Prime Minister of Canada ​Genealogy Resources for the Surname MCDONALD Clan Donald USAA nationwide organization of nearly 4,000 families who trace their ancestry to any of the branches of Clann Domhnaill.   McDonald Family Genealogy ForumSearch this popular genealogy forum for the McDonald surname to find others who might be researching your ancestors, or post your own McDonald surname query. McDonald Family DNA ProjectThis Y-DNA project includes nearly 2,000 MacDonalds (including variant spellings such as MacDaniel and MacDanold) interested in using DNA and genealogy research to trace their ancestry in Scotland or Ireland. FamilySearch - MCDONALD GenealogyExplore over 8.2 million results, including digitized records, database entries, and online family trees for the McDonald surname and its variations on the FREE FamilySearch website, courtesy of the Church of Jesus Christ of Latter-day Saints. MCDONALD Surname Family Mailing ListsRootsWeb hosts several free mailing lists for researchers of the McDonald surname. DistantCousin.com - MCDONALD Genealogy Family HistoryFree databases and genealogy links for the last name McDonald. The McDonald Genealogy and Family Tree PageBrowse genealogy records and links to genealogical and historical records for individuals with the McDonald surname from the website of Genealogy Today. -- Looking for the meaning of a given name? Check out First Name Meanings -- Cant find your last name listed? Suggest a surname to be added to the Glossary of Surname Meanings Origins. ----------------------- References: Surname Meanings Origins Cottle, Basil. Penguin Dictionary of Surnames. Baltimore: Penguin Books, 1967. Hanks, Patrick and Flavia Hodges. A Dictionary of Surnames. New York: Oxford University Press, 1989. Hanks, Patrick. Dictionary of American Family Names. New York:  Oxford University Press, 2003. MacLysaght, Edward.  Surnames of Ireland. Dublin: Irish Academic Press, 1989. Smith, Elsdon C. American Surnames. Baltimore: Genealogical Publishing Company, 1997.