Treatment of 1,2-dibromo-3-chloropropane and nitrate-contaminated water with zero-valent iron or hydrogen/palladium catalysts
Treatment of 1,2-dibromo-3-chloropropane and nitrate-contaminated water with zero-valent iron or hydrogen/palladium catalysts
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DOI：
10.1016/0043-1354(96)00120-0
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发表时间：
1996-10
期刊：
影响因子：
12.8
通讯作者：
D. P. Siantar;C. Schreier;C. Chou;M. Reinhard
中科院分区：
文献类型：
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作者：
D. P. Siantar;C. Schreier;C. Chou;M. Reinhard
比较了在水处理条件下（室温和pH值接近中性），零价铁粉和氢气在钯催化剂（H2/Pd-Al 2 O3）作用下对1，2-二溴-3-氯丙烷（DBCP）加氢脱卤生成丙烷的能力。DBCP与铁粉（100-200目，36 g/l）在HEPES缓冲水（pH = 7.0）中反应的t1 2为2.5 min，在不同的地下水（pH = 8.2-8.7）中反应的t1 2范围为41-77 min。溶解的O2和NO− 3减缓了转化，而硫酸盐和亚硝酸盐几乎没有影响。铁去除60毫克/升的硝酸盐在14分钟内与亚硝酸盐作为中间体。在10%H_2分压下，在75 ml含22.5mg1%Pd-氧化铝催化剂的地下水中，DBCP在几分钟内转化为丙烷。地下水中的速率比毫量子水慢约30%。加入到Milli-Q水中的SO2−4、NO−3、Cl−或O2对H2/Pd-alumina转化DBCP的抑制作用较弱，而SO2− 3的抑制作用则强得多。
The abilities of zero-valent iron powder and hydrogen with a palladium catalyst (H2/Pd-alumina) to hydrodehalogenate 1,2-dibromo-3-chloropropane (DBCP) to propane under water treatment conditions (ambient temperature and circumneutral pH) were compared. DBCP reacted with iron powder (100–200 mesh, 36 g/l) in HEPES-buffered water (pH = 7.0) with a t1 2of 2.5 min and in different groundwaters (pH = 8.2–8.7) with a t1 2ranging from 41–77 min. Dissolved O2and NO−3slowed the transformation, whereas sulfate and nitrite had little effect. Iron removed 60 mg/l of nitrate within 14 min with nitrite as an intermediate. In 75 ml groundwater containing 22.5 mg 1% Pd-alumina catalyst under 10% H2partial pressure, DBCP was transformed to propane within minutes. The rate in groundwater was slower by about 30% compared to Milli-Qtmwater. SO2−4, NO−3, Cl−or O2added to Milli-Q water only slightly inhibited DBCP transformation by H2/Pd-alumina, while SO2−3had a much stronger inhibitory affect.