Effects of iron-loaded activated carbon on adsorption and removal of low concentration phosphate in water
WANG Shihui, LIU Ying, LI Shuang, LIU Hengming, GU Jing, YANG Guojun, WANG Junru, WANG Hua
1.College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China; 2.College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310063, China; 3.College of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, China
Abstract: In order to remove low concentration orthophosphate from aquaculture tailwater, activated carbon supported nano-ferric hydroxide(FeOOH@AC)adsorbent was prepared by FeCl3·6H2O and activated carban and activated carbon supported nano-ferric trioxide(Fe2O3@AC)adsorbent was prepared by FeCl3, NaOH and activated carbon.Add 50 mL KH2PO4 with phosphorus concentration of 0.50 mg/L to a 250 mL Erlenmeyer flask, followed by 2 g FeOOH@AC and Fe2O3@AC were added, respectively, and was shocked for 3 h to probe into effects of adsorbent types(FeOOH@AC, activated carbon and Fe2O3@AC), adsorbent dosage(2, 10, 15, 20, 25, 30 and 40 g/L FeOOH@AC), initial orthophosphate concentration and coexisting ions in water on orthophosphate removal were investigated, to evaluate adsorption mechanism of orthophosphate from mariculture tailwater.The results showed that the optimal dose of FeOOH@AC was found to be 20 g/L, and the maximum orthophosphate adsorption capacity of FeOOH@AC to be 0.030 1 mg/g at the phosphate concentration of 0.50 mg/L, which its adsorption ability was higher than Fe2O3@AC.Cl-, Ca2+ and Mg2+ in water also affected the adsorption capacity of FeOOH@AC.The adsorption process of FeOOH@AC to orthophosphate was consistent with Langmuir isotherm and quasi-second-order kinetic equation, indicating that the adsorption of orthophosphate on FeOOH@AC is monomoleptic adsorption dominated by chemisorptions.The findings indicate that FeOOH@AC can effectively remove active phosphate from mariculture tailwater with good reusability, thus FeOOH@AC has the application potential of phosphate removal from aquaculture tailwater by efficient adsorption.
王诗慧, 刘鹰, 李双, 刘恒明, 谷晶, 杨国军, 王钧儒, 王华. 载铁活性炭对水中低浓度磷酸盐的吸附去除效果[J]. 大连海洋大学学报, 2022, 37(2): 276-284.
WANG Shihui, LIU Ying, LI Shuang, LIU Hengming, GU Jing, YANG Guojun, WANG Junru, WANG Hua. Effects of iron-loaded activated carbon on adsorption and removal of low concentration phosphate in water. Journal of Dalian Ocean University, 2022, 37(2): 276-284.
2022, Vol. 37 
