Treatment of Cr(Ⅵ) Ion in Simulated Wastewater by Walnut Shell Modified by Sulfuric Acid

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Abstract Walnut shell modified by sulfuric acid was synthesized under the conditions that the volume of 8 mol·L^-1 sulfuric acid solution is 100 mL, walnut shell dosage is 9 g, particle size of walnut shell is 80 mesh, reaction time is 3 h, reaction temperature is 25 ℃. Walnut shell modified by sulfuric acid has excellent adsorption property to Cr(Ⅵ) ion. Some factors,such as the dosage of walnut shell modified by sulfuric acid, Cr(Ⅵ) ion concentration, pH, treatment time, treatment temperature which affect the removal rate of Cr(Ⅵ) ion, were investigated. The dispose technics were more optimized through orthogonal experiment and comparative experiment. When the volume of Cr(Ⅵ) ion simulated wastewater is 150 mL, Cr(Ⅵ) ion concentration is 200 mg·L^-1, the best dispose technics are as follows:pH=1, the dosage of walnut shell modified by sulfuric acid is 1.4 g, treatment time is 3 h, treatment temperature is 25 ℃. Under those conditions, the removal rate of Cr(Ⅵ) ion was 95.86% and the adsorption capacity of sorbent was 20.54 mg·g^-1.

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	Tang Qi
	Zhao Hongjing
	Pei Congcong
	Leng Xue
	Xiong Yaomeng
	Qin Shan
	Zhang Han

Keywords： walnut shell modified by sulfuric acid； Cr(Ⅵ)； dispose technics； removal rate

Received 2020-10-19;

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Tang Qi, Zhao Hongjing, Pei Congcong, Leng Xue, Xiong Yaomeng, Qin Shan, Zhang Han.Treatment of Cr(Ⅵ) Ion in Simulated Wastewater by Walnut Shell Modified by Sulfuric Acid[J] Chemcial Industry and Engineering, 2021,V38(4): 73-77

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