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首页> 外文期刊>Environmental Science & Technology >Removal of arsenite and arsenate using hydrous ferric oxide incorporated into naturally occurring porous diatomite
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Removal of arsenite and arsenate using hydrous ferric oxide incorporated into naturally occurring porous diatomite

机译：使用掺入天然多孔硅藻土中的含水三氧化二铁去除砷和砷酸盐

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In this study, a simplified and effective method was tried to immobilize iron oxide onto a naturally occurring porous diatomite. Experimental results for several physicochemical properties and arsenic edges revealed that iron oxide incorporated into diatomite was amorphous hydrous ferric oxide (HFO). Sorption trends of Fe (25%)-diatomite for both arsenite and arsenate were similar to those of HFO, reported by Dixit and Hering (Environ. Sci. TechnoL 2003, 37, 4182-4189). The pH at which arsenite and arsenate are equally sorbed was 7.5, which corresponds to the value reported for HFO. Judging from the number of moles of iron incorporated into diatomite, the arsenic sorption capacities of Fe (25%)-diatomite were comparable to or higher than those of the reference HFO. Furthermore, the surface complexation modeling showed that the constants of equivalent to SHAsO4- or equivalent to SAsO42- species for Fe (25%)-diatomite were larger than those reference values for HFO or goethite. Larger differences in constants of arsenate surface species might be attributed to aluminum hydroxyl (equivalent to Al-OH) groups that can work better for arsenate removal. The pH-controlled differential column batch reactor (DCBR) and small-scale column tests demonstrated that Fe (25%)-diatomite had high sorption speeds and high sorption capacities compared to those of a conventional sorbent (AAFS-50) that is known to be the first preference for arsenic removal performance in Bangladesh. These results could be explained by the fact that Fe (25%)-diatomite contained well-dispersed HFO having a great affinity for arsenic species and well-developed macropores as shown by scanning electron microscopy (SEM) and pore size distribution (PSD) analyses.
机译：在这项研究中，尝试了一种简单有效的方法将氧化铁固定在天然存在的多孔硅藻土上。几种理化性质和砷边缘的实验结果表明，掺入硅藻土中的氧化铁是非晶态含水三氧化二铁（HFO）。 Dixit和Hering报道，Fe（25％）硅藻土对砷和砷的吸附趋势与HFO相似（Environ。Sci。TechnoL 2003，37，4182-4189）。亚砷酸盐和砷酸盐均被吸附的pH值为7.5，与报道的HFO值相对应。从掺入硅藻土中的铁的摩尔数来看，Fe（25％）-硅藻土的砷吸附能力与参考HFO相当或更高。此外，表面络合模型表明，Fe（25％）-硅藻土的等效于SHAsO4-或SAsO42-的常数大于HFO或针铁矿的参考值。砷酸盐表面物种常数的较大差异可能归因于羟基铝（相当于Al-OH）基团，可以更好地去除砷。 pH控制的差分柱间歇式反应器（DCBR）和小规模的柱试验表明，与传统的吸附剂（AAFS-50）相比，Fe（25％）-硅藻土具有高吸附速度和高吸附能力。是孟加拉国除砷性能的首选。通过扫描电子显微镜（SEM）和孔径分布（PSD）分析可知，Fe（25％）-硅藻土包含分散良好的HFO，该HFO对砷种类和发达的大孔具有很好的亲和力，因此可以解释这些结果。 。

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