mg-al-ce水滑石吸附去除水中的硼
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第 35 卷 第 3 期 2020 年 3 月
Article ID: 1000-324X(2020)03-0337-08
无机材料学报 Journal of Inorganic Materials
Vol. 35 : 10.15541/jim20190383
Removal of Boron from Water by Mg-Al-Ce Hydrotalcite Adsorption
Abstract: Boron is an important micronutrient for plants, animals, and humans. However, high concentrations of boron are harmful to animals and plants. A magnesium-aluminum-cerium hydrotalcite (Mg-Al-Ce-HT) was successfully prepared by the co-precipitation method for boron removal. Different analyses were conducted to confirm the structure and characteristics of Mg-Al-Ce-HT. Adsorption efficiency of Mg-Al-Ce-HT was studied as a function of initial pH, amount of adsorbent, concentration of initial boric acid, and contact time. The pH of the solution had a negligible effect on boron sorption when pH was less than 8.0. However, the adsorption capacity decreased when the pH exceeded 8.0. The optimum amount of the adsorbent was 200 mg, and the maximum adsorption capacity was 32.52 mg·g–1. Boron removal reached equilibrium at 160 min. The thermodynamic parameters revealed that the adsorption was a non-spontaneous and endothermic process. The data fitted well with the Langmuir model, which indicated that the process involved monolayer adsorption. Key words: boron removal; hydrotalcite; adsorption
ZHANG Wei1,2, LIU Chen2, CHEN Yuantao2, WU Wangsuo1
(1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; 2. School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810008, China)
Boron is an important micronutrient for plants, animals, and humans. However, high concentrations of boron are harmful to animals and plants[1]. While excessive boron reduces the yield of fruit and causes premature and extensive leaf damage in plants, it causes the dysfunction of the cardiovascular, nervous, digestive, and reproductive systems in humans and animals[2]. The average abundance of boron in the earth's crust is 10–5[3], and it is often found in seawater, groundwater, and industrial wastewater. The concentration of boron in seawater is 4–5 mg·L–1 and can reach up to 119 mg L–1 in seawater surrounding some active volcanoes and groundwater with geothermal activity[4]. Higher level of boron is typically detected in industrial wastewater, which is likely discharged into rivers or seawater. In 2011, the World Health Organization (WHO)[5] limited the maximum allowable concentration of boron in drinking water to less than 2.4 mg·L–1, and many countries set more stringent standards to adhere to the WHO-recommended limit. Considering the higher levels of boron contamination in water resources and the need to meet the regulatory requirements, the development of effective boron removal methods is critical. Currently, the methods available for boron removal from water mainly include
Article ID: 1000-324X(2020)03-0337-08
无机材料学报 Journal of Inorganic Materials
Vol. 35 : 10.15541/jim20190383
Removal of Boron from Water by Mg-Al-Ce Hydrotalcite Adsorption
Abstract: Boron is an important micronutrient for plants, animals, and humans. However, high concentrations of boron are harmful to animals and plants. A magnesium-aluminum-cerium hydrotalcite (Mg-Al-Ce-HT) was successfully prepared by the co-precipitation method for boron removal. Different analyses were conducted to confirm the structure and characteristics of Mg-Al-Ce-HT. Adsorption efficiency of Mg-Al-Ce-HT was studied as a function of initial pH, amount of adsorbent, concentration of initial boric acid, and contact time. The pH of the solution had a negligible effect on boron sorption when pH was less than 8.0. However, the adsorption capacity decreased when the pH exceeded 8.0. The optimum amount of the adsorbent was 200 mg, and the maximum adsorption capacity was 32.52 mg·g–1. Boron removal reached equilibrium at 160 min. The thermodynamic parameters revealed that the adsorption was a non-spontaneous and endothermic process. The data fitted well with the Langmuir model, which indicated that the process involved monolayer adsorption. Key words: boron removal; hydrotalcite; adsorption
ZHANG Wei1,2, LIU Chen2, CHEN Yuantao2, WU Wangsuo1
(1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; 2. School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810008, China)
Boron is an important micronutrient for plants, animals, and humans. However, high concentrations of boron are harmful to animals and plants[1]. While excessive boron reduces the yield of fruit and causes premature and extensive leaf damage in plants, it causes the dysfunction of the cardiovascular, nervous, digestive, and reproductive systems in humans and animals[2]. The average abundance of boron in the earth's crust is 10–5[3], and it is often found in seawater, groundwater, and industrial wastewater. The concentration of boron in seawater is 4–5 mg·L–1 and can reach up to 119 mg L–1 in seawater surrounding some active volcanoes and groundwater with geothermal activity[4]. Higher level of boron is typically detected in industrial wastewater, which is likely discharged into rivers or seawater. In 2011, the World Health Organization (WHO)[5] limited the maximum allowable concentration of boron in drinking water to less than 2.4 mg·L–1, and many countries set more stringent standards to adhere to the WHO-recommended limit. Considering the higher levels of boron contamination in water resources and the need to meet the regulatory requirements, the development of effective boron removal methods is critical. Currently, the methods available for boron removal from water mainly include