Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-03T23:35:59Z No. of bitstreams: 1 IzabelCristinaMedeirosCosta_DISSERT.pdf: 7508849 bytes, checksum: baba9399e7458c8670380f1bc49a950c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-07T00:21:16Z (GMT) No. of bitstreams: 1 IzabelCristinaMedeirosCosta_DISSERT.pdf: 7508849 bytes, checksum: baba9399e7458c8670380f1bc49a950c (MD5) / Made available in DSpace on 2016-06-07T00:21:16Z (GMT). No. of bitstreams: 1 IzabelCristinaMedeirosCosta_DISSERT.pdf: 7508849 bytes, checksum: baba9399e7458c8670380f1bc49a950c (MD5) Previous issue date: 2015-11-30 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Neste trabalho foi realizado um estudo dos par?metros de s?ntese da ze?lita MCM-22 (estrutura MWW) com o intuito de otimizar a obten??o deste material e aumentar sua acessibilidade, tanto pelo aumento de superf?cie externa, quanto pela gera??o de mesoporos. Foram realizadas s?nteses de rela??o Si/Al= 15 e Si/Al=50 sob condi??es est?ticas em diferentes temperaturas e com indu??o por sementes, as quais resultaram em MCM-22 pura e cristalina de rela??o Si/Al= 15 em 3 dias e Si/Al=50 em 11 dias. A redu??o do teor de hexametileneimina (HMI) foi estudada na s?ntese em agita??o. As condi??es de redu??o foram de 30 % de HMI na s?ntese padr?o de 7 dias e em s?ntese empregando sementes com tempos de 1, 2, 3 e 4 dias. Redu??o de 45 % de HMI com adi??o de ?gua-m?e e tempos de 2, 4, 5 e 7 dias. Quanto ao aumento de acessibilidade na MCM-22, buscou-se aumentar a velocidade de cristaliza??o e redu??o do tempo, com o objetivo de se obter cristais de menor tamanho. Alguns agentes foram empregados para acelerar a obten??o da MCM-22, foram estes as sementes, ?gua-m?e, incremento de temperatura e dissolu??o da s?lica. Com rela??o ainda ao aumento de acessibilidade na MCM-22, foram estudados tratamentos ?cidos para retirada de alum?nio e gera??o de mesoporos e a silaniza??o de proto-unidades zeol?ticas, que atua tamb?m na forma??o de mesoporos e na diminui??o dos cristais. O tratamento com ?cido ox?lico de concentra??o 0,5 mol/ L resultou na forma??o de mesoporos de 3 nm e a s?ntese empregando a silaniza??o de proto-unidades zeol?ticas de pr?-cristaliza??o de tr?s dias resultou na redu??o de 70 % no tamanho dos cristais e em poros mais abertos, com alguns destes com di?metros na faixa de mesoporos (2,6 nm). / In this paper a synthesis parameters study was conducted in order to optimize the obteinment of MCM-22 (MWW structure) and increase its accessibility, getting higher external surface and generating mesopores. Syntheses with Si / Al = 15 and Si / Al = 50 ratios were performed under static conditions at different temperatures and with seeds induction, which resulted in MCM-22 pure and crystalline (Si / Al ratio = 15) after 3 days and Si / Al = 50 after 11 days. The reduction of hexamethyleneimine content (HMI) was studied in the stirring synthesis and a HMI reduction of 47% was possible through the mother liquor reuse, in addition, a specific area of 481 m? / g has been obtained in the fourth synthesis day. Regarding the increase of accessibility of the MCM-22 zeolite skeins of MCM-22 plates with about 2 ?m were obtained, through the use of dissolved silica, addition of seeds, increased temperature and synthesis time of 2 days. A significant value of specific area was found for this material, around 500 m? / g. Also with respect to the increase of MCM-22 accessibility, treatment with oxalic acid concentration of 0.5 mol / L and silanization of proto-zeolitic units resulted in the mesopores formation . Furthermore, silanization still favored reduction of 70 % in crystal size and a specific area of 566 m? / g.

Made available in DSpace on 2014-12-17T15:01:47Z (GMT). No. of bitstreams: 1 LianaFA.pdf: 3114958 bytes, checksum: 98adbf744d65a1ab7d9d6e74eb3bea83 (MD5) Previous issue date: 2009-04-03 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The treatment of colored and alkaline effluent has been a challenge to the textile industry. An alternative to remove the colors of those effluents is applying magnesium chloride as a coagulant agent. The magnesium ion, in high pH, hydrolyzes itself, forming the magnesium hydroxide which has a large adsorptive area and positive electrostatic charges able to act as an efficient coagulant. The bittern wastewater from the salt industries has been studied as a potential font of this magnesium ion. Nowadays, this bittern wastewater is evicted into the sea, without any treatment or other use. This thesis has evaluated the potential of applying the wastewater from the salt industries in the treatment of dyeing effluent containing indigo dye and alkaline pH. All the experiments were made in jar tests simulating the chemical coagulation, flocculation and decantation steps ranging the pH and the concentration of magnesium ion. Were obtained removals between 96% and 76% for turbidity, apparent color, and true color, respectively, using 200mg/L Mg2+. The reduction of costs with acid, when were used the salt industries wastewater, comparing with Al2(SO4)3, was 62%. For the degradation of organic matter remaining in the clarified, around 900 mg/L, was applyed the advanced process of oxidation: photo-Fenton. The preliminary results showed 57% reduction in DOC. According to the results obtained, the salt industries wastewater can be applied, as coagulant, in the physical-chemical treatment of the denim dyeing wastewater, so it is not necessary a previous adjust of pH, efficiently and economically / O tratamento de efluentes coloridos e alcalinos tem sido um desafio para as ind?strias t?xteis. Uma alternativa para a remo??o de cor destes efluentes ? a aplica??o do cloreto magn?sio como coagulante. O ?on magn?sio, em pH elevado, se hidrolisa, formando o hidr?xido de magn?sio que possui larga ?rea adsortiva e cargas eletrost?ticas positivas capazes de agir como um eficiente coagulante. Como fonte deste ?on, tem sido estudada a ?gua residu?ria das salinas, conhecida como ?gua-m?e (A-M), rica em diversos sais. Atualmente, ela ? lan?ada diretamente no mar, sem tratamento ou aproveitamento. Esta tese avaliou a capacidade de aplica??o desta ?gua residu?ria no tratamento de efluente de tinturaria contendo corante ?ndigo e pH alcalino. Os experimentos foram realizados em Testes de Jarro, simulando as etapas de coagula??o, flocula??o e decanta??o, variando o pH e a concentra??o do ?on magn?sio. Foram obtidas remo??es m?dias de 96%, 91% e 76% para turbidez, cor aparente e cor verdadeira, respectivamente, utilizando 200 mg/L Mg2+. A redu??o de custos com ?cido, quando se usou A-M em compara??o com o Al2(SO4)3, foi de 62%. Para a degrada??o da mat?ria org?nica remanescente no clarificado, em torno de 900 mg/L, foi aplicado o processo de oxida??o avan?ada: foto-Fenton. Os resultados preliminares apresentaram redu??es de 57% de carbono org?nico dissolvido (COD). De acordo com os resultados obtidos, a ?gua residu?ria das salinas pode ser aplicada, como coagulante, no tratamento f?sico-qu?mico do efluente de tinturaria de denim, sem ajustes pr?vios de pH, de forma eficiente e econ?mica