Characteristics and mechanisms of phosphorous adsorption by rape straw-derived biochar functionalized with calcium from eggshell

被引：131

作者：

Cao, Hongliang ^{[1
,4
]}

Wu, Xueshuang ^{[1
]}

Syed-Hassan, Syed Shatir A. ^{[2
]}

Zhang, Shu ^{[3
]}

Mood, Sohrab Haghighi ^{[4
]}

Milan, Yaime Jefferson ^{[4
]}

Garcia-Perez, Manuel ^{[4
]}

机构：

[1] Huazhong Agr Univ, Coll Engn, Key Lab Agr Equipment Mid Lower Yangtze River, 1 Shizishan St, Wuhan 430070, Peoples R China

[2] Univ Teknol MARA, Fac Chem Engn, Shah Alam 40450, Selangor, Malaysia

[3] Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Peoples R China

[4] Washington State Univ, Dept Biol Syst Engn, Pullman, WA 99164 USA

来源：

BIORESOURCE TECHNOLOGY | 2020年 / 318卷

基金：

国家重点研发计划;

关键词：

Biochar; Phosphorous adsorption; Calcium modification; Eggshell; Adsorption mechanisms; CATTLE MANURE PYROLYSIS; AQUEOUS-SOLUTION; PHOSPHATE ADSORPTION; ACTIVATED CARBON; MAGNETIC BIOCHAR; REMOVAL; WATER; WASTE; RECOVERY; ADSORBENTS;

D O I：

10.1016/j.biortech.2020.124063

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Biochar modified with calcium source is acted as an effective adsorbent for phosphorous recovery. In this research, eggshell is used as a low-cost and environmentally friendly calcium source to replace chemical reagents such as CaCO3, Ca(OH)(2) and CaCl2 used in the modified biochar production. Biochar derived from rape straw and modified with eggshell shows prominent phosphorous adsorption performance (e.g., equilibrium adsorption amount, 109.7 mg/g). The kinetic and isotherm analysis demonstrate that chemical adsorption process is performed as the main controlled step for the modified biochar adsorption, and the phosphate adsorption process is composed of both monolayer adsorption and multi-layer adsorption. Moreover, it is found from the physicochemical structures comparison before and after phosphate adsorption that Ca-P precipitation, hydrogen bonding and electrostatic attraction are identified as main adsorption mechanisms. In addition, the adsorbed phosphates are mainly distributed inside the space with pore sizes of 15-50 nm.

引用

页数：9

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