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	1. Simultaneous removal of Cr(VI), Cd(II) and Pb(II) from aqueous solution by stabilized iron sulfide nanoparticles: Influencing factors and interactions of heavy metals
	ZOU Qingrong,WANG Wanyu,ZHANG Tong,LIU Yuanyuan
	Environmental Science and Techology 22 March 2020
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	Abstract:Cadmium (Cd), lead (Pb) and hexavalent chromium (Cr(VI)) often appear simultaneously in the soil and water influenced by metal smelting, chemical manufacturing and electroplating. In this study, synthetic iron sulfide nanoparticles (FeS NPs) stabilized with carboxymethyl cellulose (CMC) were utilized to remove Cr(VI), Cd and Pb from aqueous solution. Batch experiments, Visual MINTEQ model and XPS analysis were used to determine the removal efficiencies, influencing factors and mechanisms. FeS NPs suspension could remove Cr(VI), Cd and Pb simultaneously from aqueous solutions with removal capacities of Cr(VI), Cd and Pb of up to 418, 96, 585 mg per gram of stabilized FeS NPs and with final concentrations of 2.5, 0.1 and 0.1 mg/L at initial concentrations of 50, 10 and 50 mg/L, respectively. The acidic conditions significantly favored the removal of aqueous Cr(VI), while the alkaline conditions favored the removal of Cd and Pb. Oxygen would slightly inhibit the removal of Cr(VI), and there was no significant influence on that of Cd and Pb. A potential mechanism was proposed for the simultaneous removal of Cr(VI), Cd and Pb by using FeS NPs. Interactions of the three heavy metals involves the cationic bridging effect of Cd to promote the adsorption of Cr(VI), the enhanced adsorption effect to Cd by Cr-Fe-hydroxides, and the enhanced precipitation to Pb by chromate and sulfate. Therefore, FeS NPs have a high potential for the simultaneous removal of Cr(VI), Cd and Pb from the contaminated aqueous solutions.
	TO cite this article:ZOU Qingrong,WANG Wanyu,ZHANG Tong, et al. Simultaneous removal of Cr(VI), Cd(II) and Pb(II) from aqueous solution by stabilized iron sulfide nanoparticles: Influencing factors and interactions of heavy metals[OL].[22 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751293


	2. Toxicity of Uranium and Lead to B.subtilis
	liuqing,Xu weichang,Zhao guodong,Zhao youcai
	Environmental Science and Techology 05 April 2007
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:B.subtilis has the broad foreground in dealing with the heavy metals waste water. It is necessary to study the toxicity of heavy metals to B.subtilis and get “the Maximum No-Effect Level ” and “the Lethal Concentration”.The toxicity of different concentration Uranium and Lead to B.subtilis in its growth was studied by three different methods in terms of measuring the diameter of the circle of bacteriostasis, counting the bacterial population by Heamacytometer and observing the change of the shape and the density of the bacteria through microscope. The experimental results have indicated that these two heavy metals had great inhibition effect to the growth of B.subtilis. The Maximum No-Effect Level of Uranium and Lead to B.subtilis are below 1mg/L and the Lethal Concentration of Uranium and Lead to B.subtilis are 500mg/L and 1000mg/L respectively. In these methods used for the toxicity of heavy metals to microorganism，counting the bacterial population are more sensitive.
	TO cite this article:liuqing,Xu weichang,Zhao guodong, et al. Toxicity of Uranium and Lead to B.subtilis[OL].[ 5 April 2007] http://en.paper.edu.cn/en_releasepaper/content/11986

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