US 12,145,866 B2
Modified cyclodextrin/mesoporous silica for adsorbing Pb and Cd and application thereof
Jinpeng Wang, Wuxi (CN); Jing Li, Wuxi (CN); Zhengyu Jin, Wuxi (CN); Xueming Xu, Wuxi (CN); Yaoqi Tian, Wuxi (CN); Jie Long, Wuxi (CN); Xing Zhou, Wuxi (CN); and Zhengjun Xie, Wuxi (CN)
Assigned to Jiangnan University, Wuxi (CN)
Filed by Jiangnan University, Wuxi (CN)
Filed on Aug. 16, 2021, as Appl. No. 17/402,871.
Application 17/402,871 is a continuation of application No. PCT/CN2019/121385, filed on Nov. 28, 2019.
Claims priority of application No. 2019110723940 (CN), filed on Nov. 5, 2019.
Prior Publication US 2021/0371302 A1, Dec. 2, 2021
Int. Cl. C02F 1/28 (2023.01); B01J 20/24 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C02F 1/62 (2023.01); C02F 101/20 (2006.01)
CPC C02F 1/288 (2013.01) [B01J 20/24 (2013.01); B01J 20/28083 (2013.01); B01J 20/3071 (2013.01); C02F 1/62 (2013.01); B01J 2220/46 (2013.01); B01J 2220/4831 (2013.01); C02F 1/281 (2013.01); C02F 1/285 (2013.01); C02F 2101/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for quickly and selectively adsorbing Pb, which comprises:
performing a carboxymethyl modification of CD-EA-Si@Si by contacting the CD-EA-Si@Si with chloroacetic acid to prepare cyclodextrin/mesoporous silica, and
absorbing Pb in sewage by contacting the sewage with the cyclodextrin/mesoporous silica;
wherein absorbing occurs at a pH of 4 to 6,
wherein an adsorption time is 5 minutes to 2 hours, and
wherein carboxymethyl modification to prepare cyclodextrin/mesoporous silica comprises:
(a) dissolving the CD-EA-Si@Si and NaOH in distilled water, adding a chloroacetic acid solution, stirring, reacting at 40° C. to 80° C. for 6 hours to 18 hours, and cooling; and
(b) adjusting a pH after the reaction in step (a), precipitating a product with a methanol solution, filtering the product, washing the product, and drying the product at 40° C. to 60° C.