Multifunctional carboxymethyl cellulose sodium encapsulated phosphorus-enriched biochar composites: Multistage adsorption of heavy metals and controllable release of soil fertilization

被引：46

作者：

Zhang, Han ^{[1
]}

Yang, Haiping ^{[1
]}

Shao, Jingai ^{[1
]}

Chen, Yingquan ^{[1
]}

Zhang, Shihong ^{[1
,2
]}

Chen, Hanping ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

[2] 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 453卷

基金：

中国国家自然科学基金;

关键词：

Carboxymethyl cellulose; Phosphorus-enriched biochar; Multistage adsorption; Heavy metal; Slow-release fertilizer impregnation-encapsulation technology; AQUEOUS-SOLUTION; REMOVAL; ACID; DEGRADATION; PHOSPHATE; BEHAVIOR; SORPTION; CADMIUM; BIOMASS; CD(II);

D O I：

10.1016/j.cej.2022.139809

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Water and soil heavy metal contamination induced by wastewater irrigation endanger human health. To improve the long-term heavy metal removal performance in the complicated aqueous/soil system, a novel carboxymethyl cellulose sodium (CMC-Na) encapsulated phosphorus (P)-enriched biochar (CMC@MBC) was synthesized. The maximum adsorption capacities of the unmodified biochar for Pb(II), Cd(II), and Ni(II) were increased by 822, 464, and 256 mg/g, respectively. The CMC-Na encapsulation introduced abundant carboxymethyl groups and enables CMC@MBC a strong anti-pH interference ability. The sewage treatment result revealed that CMC@MBC functioned admirably with prolonged sewage flushing. The long-term effectiveness of CMC@MBC against heavy metals might be explained by a multistage adsorption process: immediate adsorption by the CMC-Na coating, fast adsorption at the interface of CMC-Na and P-enriched biochar (MBC), and delayed adsorption by the P compound progressively released from MBC. Heavy metal speciation analysis indicates that the contributions of different adsorption mechanisms vary with heavy metals. The macromolecular spatial network structure of CMC-Na could be a good cover for preventing P leaching, making CMC@MBC a great slow-release fertilizer (SRF) with a cu-mulative P release ratio of 61 % after 28 days of application. This work suggests that CMC@MBC is a low-cost and high-efficiency adsorbent and phosphorus SRF.

引用

页数：10