Enhanced nitrogen and phosphorus adsorption performance and stabilization by novel panda manure biochar modified by CMC stabilized nZVZ composite in aqueous solution: Mechanisms and application potential. (1st April 2021)

• Record Type: Journal Article
• Authors: Wang, Meijing; Hu, Sikui; Wang, Qingguo; Liang, Ying; Liu, Chaorong; Xu, Hao; Ye, Qian
• Is Part Of: Journal of cleaner production. Volume 291(2021)
• Publication Date: 2021-04-01
• Subjects: Panda manure biochar -- nZVZ-CMC-PMBC -- NH4+-N -- Phosphorus -- Adsorption; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.125221
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Direct discharge of water containing excessive nitrogen and phosphorus concentrations into the aquatic environment can lead to loss of resources and eutrophication. Biochar prepared by thermochemical treatment of feedstocks, particularly the metal modified biochar, which can be used as a new adsorbent for aquatic environmental treatment. Herein, a novel panda manure biochar (PMBC) modified by carboxymethyl cellulose (CMC) stabilized nano zero-valent zinc (nZVZ-CMC-PMBC) was developed and applied for efficiently removal of NH4 + and PO4 3− . Batch sorption experiments verified the kinetics and equilibrium isotherms of NH4 + and PO4 3− adsorption, the results showed that PMBC had significantly better adsorption performance on nitrogen and phosphorus compared to bamboo biochar. Moreover nZVZ-CMC-PMBC demonstrated maximum theoretical adsorption capacities of 40.31 mgg −1 NH4 + -N and 154.30 mgg −1 total phosphorus (TP). Characterization result of SEM-EDS, BET, FTIR, XRD and XPS reveal that PMBC had larger specific surface area and pore diameter than bamboo biochar which confirmed that PMBC contained more adsorption sites. As for nZVZ-CMC-PMBC, crystalline nZVZ flakes are dispersed and impregnated into the frame of CMC-nZVZ- PMBC composite, characterization analysis unveiled the formed complexes on its surface. Therefore, the adsorption mechanism of nZVZ-CMC-PMBC for NH4 + -N and TP mainly involved Zn 2+ precipitates, surface electrostatic attraction and surface complexation.