Enrichment of nitrogen and phosphorus by navel orange peel–derived biochars coated with different metal (hydro)oxides for the subsequent immobilization of Cd in soil

IF 8.4 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management Pub Date : 2025-07-20 DOI:10.1016/j.jenvman.2025.126675

Wuhui Luo , Qian Liu , Hongkai Cao , Sili Ren , Meng Zhang , Shichen Liu

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引用次数: 0

Abstract

Resource recovery from wastewater and heavy metal immobilization in soil are urgent environmental issues to address. Biochar is an environmentally benign agent for water and soil remediation. The recovery of nitrogen (N) and phosphorus (P) by modified biochars for the immobilization of heavy metals in soil is a sustainable development pattern that has not yet been well investigated. In this study, navel orange peel (OP) and its pyrolyzed biochar (COP) hybridized with different metal (i.e., Mg, Al, and Ca) (hydro)oxides were prepared for the simultaneous removal of ammonium (NH₄⁺), nitrate (NO₃⁻), and orthophosphate (PO₄³⁻) from simulated wastewater through batch adsorption tests. Subsequently, the performance of the derived NP-enriched composites in soil cadmium (Cd) immobilization were evaluated by leaching and mung bean cultivation tests. Among 12 prepared composites, MgAl-layered double hydroxide-coated COP (COP@MA) and pyrolyzed MgCa-loaded OP (C-OP@MC) exhibited the best adsorption performance in the NO₃⁻-H₂PO₄⁻ and NH₄⁺-H₂PO₄⁻ binary systems, respectively. The adsorption of P on the two composites was rapid and stable against variations of coexisting ions due to the inner sphere complex, while the adsorption of NO₃⁻ and NH₄⁺ were decreased by the coexisting ions to different extents. Formation of struvite at high NH₄⁺ and PO₄³⁻ concentrations accounted for the remarkably high adsorption amounts (i.e., approximately 110 and 280 mg/g for N and P, respectively) on C-OP@MC. The addition of NP-enriched COP@MA and C-OP@MC in soil provided bioavailable N and P nutrients and inhibited Cd release by transforming the acid-soluble Cd to less mobile fractions, accounting for the favorable growth and low Cd accumulation in mung beans. Metal (hydro)oxides in COP@MA and C-OP@MC were the key moieties responsible for the improved performance in N and P adsorption and subsequent Cd immobilization, providing an important reference for the modification strategy and application of biochars.

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脐橙皮衍生生物炭包覆不同金属（氢）氧化物对土壤中镉的固载富集氮磷

废水资源化和土壤重金属固定化是目前急需解决的环境问题。生物炭是一种环境友好的水和土壤修复剂。利用改性生物炭对土壤中重金属的固定化回收氮、磷是一种可持续发展模式，目前尚未得到充分的研究。本研究制备了脐橙皮（OP）及其热解生物炭（COP）与不同金属（Mg、Al和Ca）（氢）氧化物杂化，通过间歇吸附试验同时去除模拟废水中的铵（NH4+）、硝酸盐（NO3−）和正磷酸盐（PO43−）。随后，通过淋溶试验和绿豆栽培试验，评价了衍生的富np复合材料在土壤镉（Cd）固定化中的性能。在12种制备的复合材料中，mgal层状双氢氧化物包覆COP （COP@MA）和热解mgca负载OP （C-OP@MC）分别在NO3−-H2PO4−和NH4+-H2PO4−二元体系中表现出最好的吸附性能。由于内球配合物的存在，两种复合材料对磷的吸附均快速稳定，而共存离子对NO3−和NH4+的吸附均有不同程度的抑制。在C-OP@MC上，高NH4+和PO43−浓度下鸟粪石的形成导致了显著的高吸附量（即N和P分别约为110和280 mg/g）。在土壤中添加富np的COP@MA和C-OP@MC提供了生物可利用的N和P养分，并通过将酸溶性Cd转化为流动性较差的部分来抑制Cd的释放，这是绿豆生长有利和Cd积累低的原因。COP@MA和C-OP@MC中的金属（氢）氧化物是提高生物炭吸附N、P和随后固定Cd性能的关键部分，为生物炭的改性策略和应用提供了重要参考。

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来源期刊

Journal of Environmental Management 环境科学-环境科学

CiteScore

13.70

自引率

5.70%

发文量

2477

审稿时长

84 days

期刊介绍： The Journal of Environmental Management is a journal for the publication of peer reviewed, original research for all aspects of management and the managed use of the environment, both natural and man-made.Critical review articles are also welcome; submission of these is strongly encouraged.