{"created":"2022-04-14T07:39:50.411331+00:00","id":2000196,"links":{},"metadata":{"_buckets":{"deposit":"e35deaf6-38c8-40ed-8d0f-672513b54ad9"},"_deposit":{"created_by":15,"id":"2000196","owner":"15","owners":[15],"owners_ext":{"displayname":"北見工業大学学術機関リポジトリ（KIT-R）","username":"kitir"},"pid":{"revision_id":0,"type":"depid","value":"2000196"},"status":"published"},"_oai":{"id":"oai:kitami-it.repo.nii.ac.jp:02000196","sets":["2:6"]},"author_link":[],"control_number":"2000196","item_7_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2022-03","bibliographicIssueDateType":"Issued"}}]},"item_7_date_granted_63":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2022-03-18"}]},"item_7_degree_grantor_61":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"北見工業大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"10106","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_7_degree_name_60":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）","subitem_degreename_language":"ja"}]},"item_7_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"A novel separation medium was developed for designing simple, highly efficient,\nand eco-friendly remediation technologies for treating water containing highly\nbioactive organic pollutants such as pharmaceuticals, personal care products, and\npesticides. The separation medium, didodecyldimethylammonium bromidemontmorillonite\n(DDAB-MT) organoclay, was readily prepared by mixing a\ndialkylated cationic surfactant, didodecyldimethyl-ammonium bromide (DDAB)\nand a layered clay mineral, montmorillonite K30 (MT), in the aqueous solution.\nThe possibility of DDAB-MT organoclay for treating water contaminating highly\nbioactive organic pollutants was studied.\nDDAB-MT organoclay was used for the sorption and degradation of an\norganophosphate pesticide, fenitrothion, in water. The degree of sorption\nincreased by the modification of MT with DDAB, because of the formation of\nhydrophobic DDAB assemblies for the sorption of hydrophobic fenitrothion.\nFenitrothion ([M+1] = 278) sorbed on the organoclay rapidly converted to the\ndegraded product anion ([M] = 262) followed by the further degradation into 3-\nmethyl-4-nitrophenol ([M−1] = 152). The activation energy for the first-order\nreaction of the primary degradation of fenitrothion (79.9 kJ mol−1) in the organoclay\nwas lower than the value (94.1 kJ mol−1) in water. Organoclay-mediated catalytic\nactivity expressed over a wide pH region (pH 5−9), being advantageous for the\napplication to different wastewaters and environmental waters. Continuous sorption\nand degradation of fenitrothion in contaminated water was examined by using a\nlaboratory-scale organoclay-packed column. Fenitrothion-free effluent\ncontaining its degraded product, 3-methyl-4-nitrophenol, having lower toxicity to\naquatic organisms outflowed from the bottom of the column.\nThe sorption of various antibiotics, pharmaceuticals and personal care products\nin water onto DDAB-MT organoclay was also studied. The extent of the sorption\non the organoclay was largely dependent on the DDAB content; the effect of DDAB\nmodification on the sorption was also influenced by hydrophobicity and/or net\ncharge of pharmaceutical. The binding constants of β-lactam antibiotics were\ndetermined from their interaction with the DDAB molecules on the organoclay and\nwere correlated with their aqueous-octanol distribution coefficients. Additionally,\nit was also influenced by the net charge of the antibiotic. A wide range of β-lactam\nantibiotics including penicillin- and cephalosporin-type antibiotics were sorbed on\nthe organoclay and rapidly degraded under mild conditions (pH 7, 25ºC). The\ncontinuous sorption and degradation of penicillin G in a buffer solution and\nsynthesized hospital wastewater were demonstrated by using an organoclay-packed\ncolumn. The resulting effluent was free of penicillin, and containing only\npenicillin degraded products.\nIn conclusion, DDAB-MT organoclay was useful separation medium for\ndecontaminating water containing bioactive organic pollutants such as\npharmaceuticals, personal care products, and pesticides. Because of high water\npermeability and hydrophobic property, the organoclay sorbed a wide range of\norganic pollutants and efficiently decontaminated polluted water. Moreover, β-\nlactam antibiotics and fenitrothion sorbed on the organoclay degraded into less\ntoxic compounds. Continuous sorption and degradation in the contaminated water\nwas successfully demonstrated, suggesting the usefulness of DDAB-MT\norganoclay as a barrier material for controlling diffusion of bioactive organic\npollutants.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"医薬品，パーソナルケア製品，農薬などの生理活性の高い有機汚染物質\n含有水の処理のために，簡便で高効率かつ低環境負荷水処理技術を設計す\nるために，新しい分離媒体を開発した。この分離媒体は, 二本鎖カチオン\n性界面活性剤である臭化ジメチルアンモニウム（DDAB）と層状粘土鉱物で\nあるモンモリロナイトK30（MT）を水溶液中で混合することにより、容易に\n調製することができた。DDAB-MT オルガノクレーによる高生理活性有機汚\n染物質汚染水処理の可能性を検討した。\nDDAB-MT オルガノクレーを用いて，有機リン酸系農薬であるフェニトロ\nチオンの水中での吸着・分解実験を行った。 MT をDDAB で修飾することで\n吸着量が増加した。これは疎水性のDDAB 集合体が形成され、疎水性のフェ\nニトロチオンがそこに吸着されたためである。オルガノクレーに吸着した\nフェニトロチオン([M+1] = 278)は，速やかに分解生成物のアニオン([M] =\n262)に変換され，さらに3-methyl-4-nitrophenol([M-1] = 152)に分解さ\nれた。 オルガノクレーにおけるフェニトロチオンの一次分解の活性化エネ\nルギー（79.9 kJ mol-1）は，水中での値（94.1 kJ mol-1）よりも低かった。\nオルガノクレーを用いた触媒活性は，広いpH 領域（pH5～9）で発現してお\nり，さまざまな排水や環境水への適用に有利であった。実験室規模のオル\nガノクレー充填カラムを用いて、フェニトロチオン汚染水の連続的な吸着・\n分解実験をおこなった。 カラムの底から流出する、フェニトロチオンの分\n解物である3-methyl-4-nitrophenol を含み、フェニトロチオンを含まない\n水は、水生生物への毒性が低い。\nまた，水中のさまざまな抗生物質，医薬品，パーソナルケア製品のDDABMT\nオルガノクレーへの吸着についても検討した。オルガノクレーへの吸着\n量は，DDAB の含有量に大きく依存しており，吸着に対するDDAB の修飾の\n効果は，医薬品の疎水性や正味の電荷にも影響を受けた。 β-ラクタム系\n抗生物質の結合定数は，オルガノクレー上のDDAB 分子との相互作用から決\n定され，水-オクタノール分配係数と相関していた。 さらに，抗生物質の\n正味の電荷にも影響を受けていた。 ペニシリン系，セファロスポリン系を\n含む広範なβ-ラクタム系抗生物質がオルガノクレーに吸着し，温和な条\n件（pH7，25℃）で速やかに分解された。 オルガノクレーを充填したカラ\nムを用いて，緩衝液および合成病院排水中のペニシリンG の連続的な吸着\nと分解実験をおこなった。 得られた廃液にはペニシリンは含まれず，ペニ\nシリンの分解物のみが含まれていた。\n結論として，DDAB-MT オルガノクレーは，医薬品，パーソナルケア製品，\n農薬などの生理活性有機汚染物質を含む水の汚染物質除去に有用な分離媒\n体であった。 オルガノクレーは高い透水性と疎水性を有しているため，広\n範囲の有機汚染物質を吸着し，汚染水を効率的に処理することができた。\nさらに、オルガノクレーに吸着したβ-ラクタム系抗生物質やフェニトロ\nチオンは、毒性の低い化合物に分解された。 また，汚染水を連続的に吸着・\n分解することが確認され，DDAB-MT オルガノクレーが生理活性有機汚染物\n質の拡散を抑制するバリア材料として有用であることが示唆された。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_7_dissertation_number_64":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第196号"}]},"item_7_full_name_67":{"attribute_name":"著者（英）","attribute_value_mlt":[{"names":[{"name":"OIWA, MAKO","nameLang":"en"}]}]},"item_7_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.19000/0002000196","subitem_identifier_reg_type":"JaLC"}]},"item_7_select_15":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"ETD","subitem_select_language":"en"}]},"item_7_text_66":{"attribute_name":"研究科・専攻名","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"生産基盤工学専攻"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAlternatives":[{"creatorAlternative":"Oiwa, Mako","creatorAlternativeLang":"en"}],"creatorNames":[{"creatorName":"大岩, 真子","creatorNameLang":"ja"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2022-04-14"}],"filename":"大岩博論.pdf","filesize":[{"value":"2 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://kitami-it.repo.nii.ac.jp/record/2000196/files/大岩博論.pdf"},"version_id":"5ae90290-d289-42a7-9fc4-9cc2b228a439"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"A Study on Separation Media for Sustainable Water Treatment Technologies","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A Study on Separation Media for Sustainable Water Treatment Technologies","subitem_title_language":"en"},{"subitem_title":"持続可能な水処理技術のための分離媒体の研究","subitem_title_language":"ja"}]},"item_type_id":"7","owner":"15","path":["6"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2022-03-18"},"publish_date":"2022-03-18","publish_status":"0","recid":"2000196","relation_version_is_last":true,"title":["A Study on Separation Media for Sustainable Water Treatment Technologies"],"weko_creator_id":"15","weko_shared_id":3},"updated":"2023-04-03T02:24:23.094649+00:00"}