Effect of NOM on arsenic adsorption by TiO2 in simulated As(III)-contaminated raw waters

Abstract

13The effect of natural organic matter (NOM) on arsenic adsorption by a com-

Arsenite and arsenate adsorption on coprecipitated bimetal oxide magnetic nanomaterials: MnFe2O4 and CoFe2O4

“…The higher As loading (1.7 mmol/g) than that in the previous report (0.13 mmol/g) could be able to occupy more surface sites on TiO 2 (6 mmol/g), which resulted in a higher adsorption capacity. This observation is in agreement with a previous report (23).…”

The effect of humic acid on the aggregation of titanium dioxide nanoparticles under different pH and ionic strengths

“…4, there are four possible ways for the TiO 2 NPs to adsorb HA: electrostatic attraction, hydrogen bonding, Ti\O bonding and condensation (Liu et al, 2008). The charge of HA is negative, and the surface charge of the TiO 2 NPs is positive, so adsorption occurs through electrostatic attraction at pH b pH PZC .…”

Synthesis of Manganese Chloride Activated Carbon Deriving from Wheat Straw and its Adsorption Mechanism for Arsenic and Chromium

“…Still, there are no low-cost and high effective methods and materials, even based on adsorption methods, for arsenic and chromium treatment, which predominantly exist in the inorganic anion forms of 2-(VI) [11,15]. Unfortunately, Cr (VI) is about one hundred to five hundred times more toxic than Cr (III) and toxicity of Cr (VI) can seriously destroy people's health including skin irritation, nausea, severe diarrhea, as well as lung, liver, and kidney damage because of its teratogenicity, mutagenicity, and carcinogenicity in biological systems [16,17].…”

“…Heavy metals, especially the chromium and arsenic, are more problematic and threatening to ecological environment and human beings because of their high toxicity, non-biodegradation and accumulation through food chain. Thus, the World Health Organization recommended the maximum permissible limit for arsenic is 10 µg L −1 while the maximum limit for chromium is 0.05 mg L −1 in drinking water [15,17,19].…”

“…As (III), that can take up 67-99% of total arsenic in groundwater, is more problematic than As (V) because As (III) is more toxic and difficult to remove from water [3,15]. Since arsenic and chromium are highly toxic and carcinogenic, the maximum permissible limit for arsenic is 10 µg/L in drinking water according to the World Health Organization and the maximum contaminant level of chromium (VI) is 50 µg/L for potable water according to the United States Environment Protection Agency, respectively [10,12].…”