Adsorption performance of alkali-citric acid modified wood membranes towards tetracycline
ZHAO Zhiying1,, LI Yufei1,,, LIU Minmin2, YU Wenzheng2, HE Yulun1 1.College of Forestry, Northeast Forestry University, Harbin 150040, China 2.Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Abstract:Innocuous citric acid (CA) modified wood membranes (WMs) with carboxylic groups (—COOH) have broad application prospects in water purification. However, due to the structural characteristics of lignocellulose, carboxylic groups are difficult to introduce into the wood membrane wall. Herein, the wood membranes were modified via the pretreatment with various NaOH concentrations and the subsequent esterification with CA for tetracycline (TC) adsorption in water. The pretreatment of alkali was beneficial to the esterification of CA and lignocellulose, and the content of carboxylic groups in wood membrane increased greatly. The TC adsorption curves showed that at the alkali concentration of 6% and TC effluent concentration of 0.5 mg·L?1, the modified WM had effective filtration volume of 1 968 BV (bed volume), which was about 48 times higher than unmodified WM. The TC adsorption efficiency by modified WM could reach up to 97% after four cycles. At effluent TC concentrations of 0~0.5 mg·L?1, the cost of water treatment is 0.036 0~0.083 25 yuan·m?3. The modified WM has a great potential in TC removal from water. The study provides effective strategies reference for overcoming critical limitations related with the application of WM and design an environmentally friendly, economical and effective membrane material for environmental remediation. Key words:citric acid/ wood membrane/ tetracycline/ alkali/ adsorption.
图1亚甲基蓝在620 nm处的标准曲线 Figure1.Standard curve of methylene blue at 620 nm
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1.College of Forestry, Northeast Forestry University, Harbin 150040, China 2.Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China Received Date: 2020-12-03 Accepted Date: 2021-02-24 Available Online: 2021-05-23 Keywords:citric acid/ wood membrane/ tetracycline/ alkali/ adsorption Abstract:Innocuous citric acid (CA) modified wood membranes (WMs) with carboxylic groups (—COOH) have broad application prospects in water purification. However, due to the structural characteristics of lignocellulose, carboxylic groups are difficult to introduce into the wood membrane wall. Herein, the wood membranes were modified via the pretreatment with various NaOH concentrations and the subsequent esterification with CA for tetracycline (TC) adsorption in water. The pretreatment of alkali was beneficial to the esterification of CA and lignocellulose, and the content of carboxylic groups in wood membrane increased greatly. The TC adsorption curves showed that at the alkali concentration of 6% and TC effluent concentration of 0.5 mg·L?1, the modified WM had effective filtration volume of 1 968 BV (bed volume), which was about 48 times higher than unmodified WM. The TC adsorption efficiency by modified WM could reach up to 97% after four cycles. At effluent TC concentrations of 0~0.5 mg·L?1, the cost of water treatment is 0.036 0~0.083 25 yuan·m?3. The modified WM has a great potential in TC removal from water. The study provides effective strategies reference for overcoming critical limitations related with the application of WM and design an environmentally friendly, economical and effective membrane material for environmental remediation.