高校问答贝昕的小说哪本好:请各位高手帮忙翻译专业英语 环境工程
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Some attempts have been made to immobilize
Fe-ions in some common and cheap carriers such as
zeolite, and some satisfied results were also achieved
in catalytic wet air oxidation system (Centi et al.,
2000). But few such attempts were made in the case
of the photo-Fenton process.
Investigations (Pintar and Levec, 1992; Sxriolo
et al., 1994) showed that other transition metal ions,
due to their variety of valence can replace ferric ion
and serve as a like-Fenton reagent. Furthermore,
different kinds of transition metal ions and their ratio
in the homogeneous UV/Fenton process will
favorably affect the degradation of contamination
significantly; which indicated the existence of syne-
rgistic effect among these transition metal ions.
However, few studies have been carried out in the
case of heterogeneous processes. It will be great
practical value to use multi-component transition
metals instead of single metal in the catalyst design
because of their higher catalytic ability and stability
as well as lower cost.
In this work, a catalyst with multi-component
transition metals was developed and applied to the
heterogeneous UV/Fenton process for phenol degradation.
The effects of operation conditions were
evaluated and compared for different UV/Fenton
processes.
MATERALS AND METHODS
Preparation
MATERALS AND METHODS
Preparation of catalyst
The pH of a solution prepared with a certain
concentration of transition metal ions was adjusted to 4.0 and after a certain quantity of NaY zeolite wasadded to the solution, ion-exchange occurred for 24hours under continuous stirring. After filtrating and washing thrice with deionized water, the catalyst was dried at 110 ºC for 6 hours and sintered at 550ºC for 5 hours. After the concentrations of residue
metal ions in the solution were measured, the
amount of metal ions loaded on the catalyst was
calculated. The solution was strictly controlled at pH 4.0 to prevent metal ions precipitation during ion exchange.
Experimental setup and operation of heterogeneous
UV/Fenton process
Fe-ions in some common and cheap carriers such as
zeolite, and some satisfied results were also achieved
in catalytic wet air oxidation system (Centi et al.,
2000). But few such attempts were made in the case
of the photo-Fenton process.
Investigations (Pintar and Levec, 1992; Sxriolo
et al., 1994) showed that other transition metal ions,
due to their variety of valence can replace ferric ion
and serve as a like-Fenton reagent. Furthermore,
different kinds of transition metal ions and their ratio
in the homogeneous UV/Fenton process will
favorably affect the degradation of contamination
significantly; which indicated the existence of syne-
rgistic effect among these transition metal ions.
However, few studies have been carried out in the
case of heterogeneous processes. It will be great
practical value to use multi-component transition
metals instead of single metal in the catalyst design
because of their higher catalytic ability and stability
as well as lower cost.
In this work, a catalyst with multi-component
transition metals was developed and applied to the
heterogeneous UV/Fenton process for phenol degradation.
The effects of operation conditions were
evaluated and compared for different UV/Fenton
processes.
MATERALS AND METHODS
Preparation
MATERALS AND METHODS
Preparation of catalyst
The pH of a solution prepared with a certain
concentration of transition metal ions was adjusted to 4.0 and after a certain quantity of NaY zeolite wasadded to the solution, ion-exchange occurred for 24hours under continuous stirring. After filtrating and washing thrice with deionized water, the catalyst was dried at 110 ºC for 6 hours and sintered at 550ºC for 5 hours. After the concentrations of residue
metal ions in the solution were measured, the
amount of metal ions loaded on the catalyst was
calculated. The solution was strictly controlled at pH 4.0 to prevent metal ions precipitation during ion exchange.
Experimental setup and operation of heterogeneous
UV/Fenton process
有些尝试被做固定Fe 离子在某个共同和便宜载体里譬如 泡沸石, 并且有些满意的结果并且达到在起催化作用湿的空气氧化 作用系统(Centi 等, 2000) 。但少量这样尝试被做在相片 Fenton 过程的情况。调查(Pintar 和Levec, 1992 年; Sxriolo 等, 1994) 表示其它转折金属离子, 由于化学价他们的品种可能替 换铁离子和担当A 象Fenton 试剂。再者, 不同的种类转折金属离子 和他们的比率在同类的UV/Fenton 过程中重大地有利地将影响污秽 的贬低; 哪些表明syne- rgistic 作用存在在这些转折金属离子之 中。然而, 少量研究被执行在异种过程情况。这是了不起的实用价 值使用multi-component 转折金属代替唯一金属在催化剂设计由于 他们的比较高的起催化作用能力和安定并且低成本。在这工作, 一 种催化剂与multi-component 转折金属向异种UV/Fenton 过程被开 发和被应用为酚贬低。操作情况的作用被评估和被比较为不同的 UV/Fenton 过程。MATERALS 和方法准备