JP2000233135A - Photocatalyst carrying composition and its manufacture - Google Patents
Photocatalyst carrying composition and its manufactureInfo
- Publication number
- JP2000233135A JP2000233135A JP11035855A JP3585599A JP2000233135A JP 2000233135 A JP2000233135 A JP 2000233135A JP 11035855 A JP11035855 A JP 11035855A JP 3585599 A JP3585599 A JP 3585599A JP 2000233135 A JP2000233135 A JP 2000233135A
- Authority
- JP
- Japan
- Prior art keywords
- photocatalyst
- air
- drain
- inorganic compound
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 31
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 150000002484 inorganic compounds Chemical class 0.000 claims abstract description 23
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000004898 kneading Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 241000233866 Fungi Species 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010979 pH adjustment Methods 0.000 abstract description 2
- 230000001954 sterilising effect Effects 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 abstract 1
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 230000001473 noxious effect Effects 0.000 abstract 1
- 239000011343 solid material Substances 0.000 abstract 1
- 238000004659 sterilization and disinfection Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 238000007922 dissolution test Methods 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000008213 purified water Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、光触媒担持組成
物及びその製造方法に関するものである。[0001] The present invention relates to a photocatalyst-supporting composition and a method for producing the same.
【０００２】[0002]
【従来の技術】従来の光触媒担持組成物としては、光触
媒の担持媒体として水硬性無機化合物、例えば、白色セ
メントを使用したものが知られている（特開平１０−１
８０１１６号公報参照）。2. Description of the Related Art As a conventional photocatalyst-supporting composition, there has been known a composition using a hydraulic inorganic compound, for example, white cement, as a photocatalyst-supporting medium (Japanese Patent Laid-Open No. 10-1).
No. 80116).
【０００３】この組成物は、光触媒と水硬性無機化合物
と水の混合物が水和反応によって硬化したものであっ
て、水硬性無機化合物の中に光触媒を分散担持したもの
である。In this composition, a mixture of a photocatalyst, a hydraulic inorganic compound and water is cured by a hydration reaction, and the photocatalyst is dispersed and supported in the hydraulic inorganic compound.
【０００４】[0004]
【発明が解決しようとする課題】従来の光触媒担持組成
物は、上述のように担持媒体として低コストで作業性の
よい水硬性無機化合物を使用するから、安価で経済的で
ある。The conventional photocatalyst-supporting composition uses a low-cost, highly workable hydraulic inorganic compound as a support medium as described above, so that it is inexpensive and economical.
【０００５】しかし、次のような問題点がある。However, there are the following problems.
【０００６】（１）水硬性無機化合物が水和反応で硬化
する過程で、主成分であるＣａＯが水酸化カルシウムと
なって溶出し、これらが担持した光触媒の表面を覆って
その活性を低下させてしまう。(1) In the process of hardening a hydraulic inorganic compound by a hydration reaction, CaO, which is a main component, elutes as calcium hydroxide, and covers the surface of the photocatalyst carried by these to reduce its activity. Would.
【０００７】（２）光触媒担持組成物の破砕粒子は、流
水中における流動性が悪い。これは、担持媒体である水
硬性無機化合物の比重が約２．６ｇ／cm3 と大きく、重
いためである。このため、この破砕粒子を排水処理に使
用した場合、流動床における流動に大きなエネルギーを
必要とする。(2) The crushed particles of the photocatalyst-supporting composition have poor fluidity in running water. This is because the specific gravity of the hydraulic inorganic compound as the supporting medium is as large as about 2.6 g / cm 3 and heavy. For this reason, when the crushed particles are used for wastewater treatment, a large amount of energy is required for fluidization in the fluidized bed.
【０００８】（３）水硬性無機化合物は、ＣａＯを主成
分とするから、水和反応で硬化する過程で水酸化カルシ
ウムが溶出する。溶出試験（環境庁告示第１３号による
溶出試験、以下同じ）によれば、ｐＨ＝１１の強アルカ
リ性である。このため、この水硬性無機化合物を使用し
た光触媒担持組成物の破砕粒子を排水処理に用いる場合
には、酸によるｐＨ調整が必要になる。(3) Since the hydraulic inorganic compound contains CaO as a main component, calcium hydroxide elutes during the process of hardening by hydration. According to the dissolution test (dissolution test according to the Environment Agency Notification No. 13; the same applies hereinafter), it is strongly alkaline at pH = 11. Therefore, when crushed particles of the photocatalyst-supporting composition using the hydraulic inorganic compound are used for wastewater treatment, pH adjustment with an acid is required.
【０００９】この発明は、このような従来の問題点を解
決することを目的とする。An object of the present invention is to solve such a conventional problem.
【００１０】[0010]
【課題を解決するための手段】この発明に係る光触媒担
持組成物は、気硬性無機化合物で光触媒を担持したもの
である。The photocatalyst-supporting composition according to the present invention comprises a photocatalyst supported by an air-hardening inorganic compound.
【００１１】また、この発明に係る光触媒担持組成物の
製造方法は、気硬性無機化合物１００重量部と光触媒１
０〜５０重量部と水２０〜３０重量部を混練し、得られ
た粘土状固化物を４０〜６０℃／ｈｒ以下の昇温速度で
１００〜５００℃まで加熱乾燥することを特徴とする方
法である。Further, the method for producing the photocatalyst-supporting composition according to the present invention comprises the steps of:
A method comprising kneading 0 to 50 parts by weight of water and 20 to 30 parts by weight of water, and heating and drying the obtained clay-like solidified product to 100 to 500 ° C. at a heating rate of 40 to 60 ° C./hr or less. It is.
【００１２】上記気硬性無機化合物は、乾燥すると、自
由水が脱水されて硬化する化合物である。The air-hard inorganic compound is a compound which, when dried, hardens by dehydrating free water.
【００１３】自由水の脱水は、１００℃付近の温度で大
部分完了し、脱水（乾燥）後の硬化した化合物には、水
の抜けた跡が気孔として残る。乾燥後の気硬性無機化合
物のかさ比重は、およそ１．７ｋｇ／ｄｍ3 以下とな
る。したがって、気硬性無機化合物を使用した光触媒担
持組成物は、軽量になり、その破砕粒子の水中における
流動性が良くなる。The dehydration of free water is mostly completed at a temperature of around 100 ° C., and the cured compound after dehydration (drying) has traces of water loss as pores. The bulk specific gravity of the air-hardened inorganic compound after drying is about 1.7 kg / dm 3 or less. Therefore, the photocatalyst-supporting composition using the air-hardened inorganic compound is reduced in weight, and the crushed particles have improved fluidity in water.
【００１４】気硬性無機化合物は、一例をあげれば、Ａ
ｌ2 Ｏ3 （３５重量％）とＳｉＯ2（５３重量％）を主
成分とし、その他にＮａ2 Ｏ（５重量％）とＦｅＯ、Ｃ
ａＯ等を少量含有したものである。プラスチック耐火
物、ラミング耐火物、耐火モルタルなどは、その一例で
ある。The air-hardening inorganic compound is, for example, A
l 2 O 3 (35% by weight) and SiO 2 (53% by weight) as main components, and Na 2 O (5% by weight), FeO, C
It contains a small amount of aO and the like. Plastic refractories, ramming refractories, refractory mortars and the like are examples.
【００１５】気硬性無機化合物は、上述のように、Ａｌ
2 Ｏ3 とＳｉＯ2 を主成分とする安定した化合物である
から、光触媒担持組成物の製造過程において組成分の溶
出のおそれがない。従来の水硬性無機化合物は、その溶
出成分が光触媒の表面を覆って、その活性を低下させ
る。これに対し、この発明で使用する気硬性無機化合物
の場合は、その組成分が溶出しないから、担持された光
触媒の活性が低下するという現象は生じない。As described above, the air-hardening inorganic compound is Al
Since it is a stable compound containing 2 O 3 and SiO 2 as main components, there is no danger of elution of the components during the production process of the photocatalyst-supporting composition. In the conventional hydraulic inorganic compound, the eluted component covers the surface of the photocatalyst and reduces its activity. On the other hand, in the case of the air-hardened inorganic compound used in the present invention, since the components are not eluted, the phenomenon that the activity of the supported photocatalyst is reduced does not occur.
【００１６】また、気硬性無機化合物は、組成分、特に
アルカリ成分の溶出がないから、この化合物を使用した
光触媒担持組成物を排水処理に用いた場合、酸によるｐ
Ｈ調整を必要としない。ちなみに、気硬性化合物の溶出
試験によれば、ｐＨはほぼ中性である。Further, since the composition of the gas-hardening inorganic compound, particularly the alkali component, is not eluted, when the photocatalyst-supporting composition using this compound is used for wastewater treatment, p
No H adjustment is required. Incidentally, according to the dissolution test of the thermosetting compound, the pH is almost neutral.
【００１７】[0017]
【発明の実施の形態】以下、この発明の実施の形態を実
施例によって説明する。Embodiments of the present invention will be described below with reference to embodiments.
【００１８】（実施例１）気硬性耐火物（日本プライブ
リコ社製）３３ｇとアナターゼ型二酸化チタン（石原テ
クノ（株）製、ＳＴ−０１）５ｇを混合し、これに水１
２．２ｇを添加しながらミキサーを用いて１分間混練
し、粘土状混合物を得た。Example 1 33 g of an air-hardened refractory (manufactured by Nippon Pribrico Co.) and 5 g of anatase type titanium dioxide (ST-01, manufactured by Ishihara Techno Co., Ltd.) were mixed with water.
While adding 2.2 g, the mixture was kneaded for 1 minute using a mixer to obtain a clay-like mixture.
【００１９】つぎに、この混合物を５０℃／ｈｒの昇温
温度で１００℃まで加熱し、自由水を蒸発させて固化さ
せた。固化後に、２〜３mmφの粒子に破砕し、光触媒担
持組成物を得た。Next, the mixture was heated to 100 ° C. at a heating temperature of 50 ° C./hr, and free water was evaporated to solidify. After solidification, it was crushed into particles having a diameter of 2 to 3 mm to obtain a photocatalyst-supporting composition.
【００２０】得られた光触媒担持組成物の破砕面を観察
したところ、微細な凹凸ができていて、二酸化チタンは
均一に分散していた。表面積は、Ｎ2 ＢＥＴ法で測定し
たところ、６２．５ｍ2 ／ｇであり、吸着剤として使用
されているシリカゲルの２０〜３０ｍ2 ／ｇと比較して
も劣らず、砂の０．７ｍ2 ／ｇの１０倍弱であった。か
さ比重は１．４ｋｇ／ｄｍ3 であり、破砕粒子を浸漬し
た水のｐＨ（溶出試験）は、７．８であった。Observation of the crushed surface of the obtained photocatalyst-supporting composition revealed that fine irregularities were formed and titanium dioxide was uniformly dispersed. Surface area was measured by N 2 BET method is 62.5m 2 / g, not as good as compared to 20 to 30 m 2 / g of silica gel are used as an adsorbent, sand 0.7 m 2 / G less than 10 times. The bulk specific gravity was 1.4 kg / dm 3 , and the pH (dissolution test) of the water in which the crushed particles were immersed was 7.8.
【００２１】実施例１の破砕粒子は、例えば、図１に示
す外部循環式三相流動床において使用すれば、排水中に
含まれる有害物質を分解除去することができる。When the crushed particles of Example 1 are used, for example, in an external circulation type three-phase fluidized bed shown in FIG. 1, harmful substances contained in wastewater can be decomposed and removed.
【００２２】すなわち、いま、排水供給管２より排水を
導入し、エア供給管３より空気を供給すると、排水は紫
外線ランプ４の周囲を通って実線で示す矢印方向に循環
し、破砕粒子６は循環する排水にのって流動する。排水
中の有機系有害物質は、この過程で破砕粒子に吸着さ
れ、紫外線ランプ４の光によって励起された光触媒との
反応により分解除去される。浄化された水は、鎖線で示
す方向に流れて浄化水流出管５より排出される。この
間、流動床における排水のｐＨ調整は必要としない。That is, when waste water is introduced from the waste water supply pipe 2 and air is supplied from the air supply pipe 3, the waste water circulates around the ultraviolet lamp 4 in the direction indicated by the solid line, and the crushed particles 6 Flows on circulating wastewater. Organic harmful substances in the wastewater are adsorbed by the crushed particles in this process, and are decomposed and removed by a reaction with a photocatalyst excited by the light of the ultraviolet lamp 4. The purified water flows in the direction indicated by the chain line and is discharged from the purified water outflow pipe 5. During this time, it is not necessary to adjust the pH of the wastewater in the fluidized bed.
【００２３】上記流動床で使用した破砕粒子６は、２〜
３mmφであるが、空気の供給速度、流動槽１の大きさ等
によって、流動し易い大きさにすることができる。The crushed particles 6 used in the fluidized bed are
Although it is 3 mmφ, it can be made into a size that can easily flow depending on the air supply speed, the size of the fluidizing tank 1 and the like.
【００２４】（実施例２）実施例１において得られた粘
土状混合物を５０℃／ｈｒの昇温速度で５００℃まで加
熱し、自由水を蒸発させて固化させたところ、かさ比重
が１．３ｋｇ／ｄｍ3 の光触媒担持組成物が得られた。
この組成物は、流動床において容易に破壊しないもので
あった。Example 2 The clay-like mixture obtained in Example 1 was heated to 500 ° C. at a heating rate of 50 ° C./hr and solidified by evaporating free water to obtain a bulk specific gravity of 1. 3 kg / dm 3 of the photocatalyst-carrying composition was obtained.
The composition did not break easily in the fluidized bed.
【００２５】[0025]
【発明の効果】以上説明したように、この発明の光触媒
担持組成物は、光触媒の担持媒体として気硬性無機化合
物を使用したから、次の効果を奏する。As described above, the photocatalyst-supporting composition of the present invention has the following effects since it uses an air-hardening inorganic compound as a photocatalyst-supporting medium.
【００２６】（１）比重が小さく、軽量であるため、流
動床において容易に流動し、流動に大きなエネルギーを
必要としない。このため、流動床において水中の有機物
を分解除去したり、菌類の殺菌処理をしたりするのに好
適である。(1) Since it has a small specific gravity and is lightweight, it flows easily in a fluidized bed, and does not require a large amount of energy for flow. For this reason, it is suitable for decomposing and removing organic substances in water in a fluidized bed and for sterilizing fungi.
【００２７】（２）排水処理に使用する場合、排水のｐ
Ｈ調整を必要としない。(2) When used for wastewater treatment, p
No H adjustment is required.
【００２８】（３）気硬性無機酸化物の組成分によっ
て、担持した光触媒の活性が低下しない。(3) The activity of the supported photocatalyst does not decrease due to the composition of the air-hardening inorganic oxide.
【００２９】（４）排水処理以外にも、例えば、ゴミ焼
却場のダイオキシンを吸着する耐火材、セメントに代る
結合材、通水性のある植木鉢等に利用することができ
る。(4) In addition to wastewater treatment, for example, it can be used as a refractory material for adsorbing dioxin in a garbage incineration plant, a binder instead of cement, a water-permeable flowerpot, and the like.
【図１】 実施例１の光触媒担持組成物の破砕粒子を使
用した外部循環式三相流動床の構成図FIG. 1 is a configuration diagram of an external circulation type three-phase fluidized bed using crushed particles of the photocatalyst-supporting composition of Example 1.
１ 流動槽 ２ 排水供給管 ３ エア供給管 ４ 紫外線ランプ ５ 浄化水排出管 ６ 光触媒担持組成物の破砕粒子 DESCRIPTION OF SYMBOLS 1 Fluid tank 2 Drain supply pipe 3 Air supply pipe 4 Ultraviolet lamp 5 Purified water discharge pipe 6 Crushed particles of photocatalyst carrying composition
フロントページの続き Ｆターム(参考） 4G069 AA01 AA03 AA08 BA01A BA01B BA01C BA04A BA04B BA04C BA48A BA48C BC02A CC33 DA08 FA03 FB06 FB57Continued on front page F-term (reference) 4G069 AA01 AA03 AA08 BA01A BA01B BA01C BA04A BA04B BA04C BA48A BA48C BC02A CC33 DA08 FA03 FB06 FB57
Claims (2)
る光触媒担持組成物。1. A photocatalyst-supporting composition comprising a photocatalyst supported by an air-hardening inorganic compound.
１０〜５０重量部と水２０〜３０重量部を混練し、得ら
れた粘土状固化物を４０〜６０℃／ｈｒ以下の昇温速度
で１００〜５００℃まで加熱乾燥することを特徴とする
光触媒担持組成物の製造方法。2. Kneading 100 parts by weight of an air-hardening inorganic compound, 10 to 50 parts by weight of a photocatalyst and 20 to 30 parts by weight of water, and subjecting the obtained clay-like solid to a heating rate of 40 to 60 ° C./hr or less. A method for producing a photocatalyst-supporting composition, comprising drying by heating to 100 to 500C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11035855A JP2000233135A (en) | 1999-02-15 | 1999-02-15 | Photocatalyst carrying composition and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11035855A JP2000233135A (en) | 1999-02-15 | 1999-02-15 | Photocatalyst carrying composition and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000233135A true JP2000233135A (en) | 2000-08-29 |
Family
ID=12453615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11035855A Pending JP2000233135A (en) | 1999-02-15 | 1999-02-15 | Photocatalyst carrying composition and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000233135A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112516985A (en) * | 2020-11-12 | 2021-03-19 | 南京国兴环保产业研究院有限公司 | Photocatalyst-loaded supercritical foaming material and preparation method thereof |
-
1999
- 1999-02-15 JP JP11035855A patent/JP2000233135A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112516985A (en) * | 2020-11-12 | 2021-03-19 | 南京国兴环保产业研究院有限公司 | Photocatalyst-loaded supercritical foaming material and preparation method thereof |
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