Technics Optimization of Hydrogen Peroxide Modified Rice Straw as Pb(Ⅱ) Adsorbent

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Abstract As an adsorbent for Pb(Ⅱ) ions, hydrogen peroxide modified rice straw shows the advantage of environmental safety and simple modification process, low cost, and high adsorption rate for Pb(Ⅱ) ions. Optimization of the modification process has a strong practical value. Some factors, including medium pH, H₂O₂ dosage, Fe²⁺/H₂O₂ molar ratio, modification temperature, modification time, particle size and dosage of rice straw were investigated in detail. Based on single factor experiments, the modification technics were further optimized through orthogonal experiments and comparative experiments. The optimum modification technics are as follows: in 100 mL of solution, Fe²⁺/H₂O₂ molar ratio was 0, rice straw dosage was 3 g, particle size was 40 mesh, medium pH was 8, H₂O₂ dosage was 30% of the mass of rice straw, modification temperature was 20 ℃, and modification time was 4 h. 2 g adsorbent prepared under the optimal conditions selected was used to treat 100 mL of 200 mg/L simulated wastewater containing Pb(Ⅱ) ions. The adsorption rate of Pb(Ⅱ) ions was 94.45% and the adsorption capacity of adsorbent was 9.445 mg/g. It shows that rice straw modified by H₂O₂ has good adsorption property.

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	Articles by authors
	Tang Qi
	Liu Pan
	Tu Sheng
	Li Chuanqiang

Keywords： rice straw； hydrogen peroxide； Pb(Ⅱ) ions； optimization of modification technics； adsorption rate

Received 2019-10-14;

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Tang Qi, Liu Pan, Tu Sheng, Li Chuanqiang.Technics Optimization of Hydrogen Peroxide Modified Rice Straw as Pb(Ⅱ) Adsorbent[J] Chemcial Industry and Engineering, 2020,V37(3): 39-44,59

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