Novel biochar-impregnated calcium alginate beads with improved water holding and nutrient retention properties

被引：89

作者：

Wang, Bing ^{[1
,2
,4
]}

Gao, Bin ^{[2
]}

Zimmerman, Andrew R. ^{[3
]}

Zheng, Yulin ^{[2
]}

Lyu, Honghong ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China

[2] Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA

[3] Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA

[4] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Puding Karst Ecosyst Res Stn, Puding 562100, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2018年 / 209卷

基金：

美国国家科学基金会;

关键词：

Biochar; Ball milling; Calcium alginate beads; Controlled release; Water holding capacity; Soil amendment; LABORATORY-PRODUCED BIOCHARS; SANDY SOIL; PYROLYSIS TEMPERATURE; CONTROLLED-RELEASE; ACTIVATED CARBON; PARTICLE-SIZE; TRANSPORT; CAPACITY; SORPTION; AVAILABILITY;

D O I：

10.1016/j.jenvman.2017.12.041

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Drought conditions and nutrients loss have serious impacts on soil quality as well as crop yields in agroecosystems. New techniques are needed to carry out effective soil water and nutrient conservation and fertilizer application tools. Here, calcium alginate (CA) beads impregnated with ball-milled biochar (BMB) were investigated as a new type of water/nutrients retention agent. Both CA and Ca-alginate/ball milled biochar composite (CA-BMB) beads showed high kinetic swelling ratios in KNO3 solution and low kinetic swelling ratios in water, indicating that CA-BMB beads have the potential to retain mineral nitrogen and nutrients by ion exchange. Pseudo-second-order kinetic model well-described the swelling kinetics of both beads in KNO3 solution. Over a range of temperatures, the characteristics of dehydration suggested that impregnation with BMB improved the water holding capacity and postponed the dehydration time of Ca-alginate. The cumulative swelling and release characteristics of water, K+, and NO3- indicated that CA-BMB beads have great potential as a soil amendment to improve its nutrient retention and water holding capacity. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：105 / 111

页数：7

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