TY - JOUR
T1 - Assembling biochar with various layered double hydroxides for enhancement of phosphorus recovery
AU - Yang, Fan
AU - Zhang, Shuaishuai
AU - Sun, Yuqing
AU - Tsang, Daniel C.W.
AU - Cheng, Kui
AU - Ok, Yong Sik
N1 - Funding Information:
The authors appreciate the financial support from University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province ( UNPYSCT-2017018 ), National Natural Science Fund for Young Scholars ( 31600413 ), Natural Science Foundation of Heilongjiang Province of China ( QC2018019 ), and Hong Kong Research Grants Council ( PolyU 15217818 ).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/3/5
Y1 - 2019/3/5
N2 - Highly efficient and cost-effective adsorbents for phosphate (P) recovery are the key to control eutrophication and recover phosphorus from waste streams to enhance food production. This study assembled corn stalk-derived biochar (BC) with various forms of layered double hydroxides (LDHs) (B-M-LDH) through simultaneous pyrolysis of waste biomass and metal (i.e., Zn/Al, Mg/Al, and Ni/Fe) hydroxide precipitates. Batch sorption experiments evaluated the kinetics and isotherms of phosphate adsorption as well as the influence of pH value and co-existing anions. Morphological characterization showed that crystalline LDH flakes were impregnated within the framework of fabricated B-M-LDH composites. Superior P adsorption capacity (152.1 mg (P) g−1) and fast Elovich kinetics (5925 mg g−1 h−1) could be achieved by the B-Zn/Al-LDH composite at pH 5. The P adsorption onto BC-LDHs was pH dependent and subjected to adverse influence of co-existing anions. Interlayer anion exchange and surface complexation were probably the predominant adsorption mechanisms at the studied phosphate concentration. Therefore, BC can be functionalized as mineral composites for enhancing P recovery and wastewater treatment.
AB - Highly efficient and cost-effective adsorbents for phosphate (P) recovery are the key to control eutrophication and recover phosphorus from waste streams to enhance food production. This study assembled corn stalk-derived biochar (BC) with various forms of layered double hydroxides (LDHs) (B-M-LDH) through simultaneous pyrolysis of waste biomass and metal (i.e., Zn/Al, Mg/Al, and Ni/Fe) hydroxide precipitates. Batch sorption experiments evaluated the kinetics and isotherms of phosphate adsorption as well as the influence of pH value and co-existing anions. Morphological characterization showed that crystalline LDH flakes were impregnated within the framework of fabricated B-M-LDH composites. Superior P adsorption capacity (152.1 mg (P) g−1) and fast Elovich kinetics (5925 mg g−1 h−1) could be achieved by the B-Zn/Al-LDH composite at pH 5. The P adsorption onto BC-LDHs was pH dependent and subjected to adverse influence of co-existing anions. Interlayer anion exchange and surface complexation were probably the predominant adsorption mechanisms at the studied phosphate concentration. Therefore, BC can be functionalized as mineral composites for enhancing P recovery and wastewater treatment.
KW - Biomass waste valorization
KW - Engineered biochar
KW - Mineral-biochar composites
KW - Resource recovery
KW - Wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=85056840233&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2018.11.047
DO - 10.1016/j.jhazmat.2018.11.047
M3 - Article
C2 - 30472452
AN - SCOPUS:85056840233
SN - 0304-3894
VL - 365
SP - 665
EP - 673
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -
