Overlooked role of long capping time and environmental factors in the plateau lake for impairing lanthanum-modified-bentonite's immobilization to phosphate.

Jinhui Wang, Lina Chi, Shuai Liu, Jiao Yin, Youlin Zhang, Jian Shen, Xinze Wang

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Article in Water research X, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Jinhui WangSchool of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.

Lina ChiSchool of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.

Shuai LiuSchool of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.

Jiao YinYuxi Lake Ecological Environment Protection Research and Engineering Management Center, China.

Youlin ZhangYuxi Lake Ecological Environment Protection Research and Engineering Management Center, China.

Jian ShenSchool of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.

Xinze WangSchool of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Lanthanum-modified-bentonite(LMB) has been applied for eutrophication management as a phosphate(P)-binding agent in many lakes. However, re-eutrophication took place several years or decades later after the first practice of capping due to dynamic environmental factors in the plateau lake. Here, we investigated the effect of long-term capping and integrated environmental factors in the plateau lake including alkalinity, organic matter, disturbance and photodegradation to the LMB immobilization. Long-term LMB immobilization exhibited C accumulation(82.3%), La depletion(53.5%) and lager size effect in the sediment particle, indicating the breakage of La-O-P bonds and the formation of La-O-C bonds over immobilization time. Additionally, pH(8-10) in the plateau lake could enhance the P desorption and decrease P adsorption through electrostatic repulsion enhancement with the zeta potential reduction(7.2 mV). Further disturbance experiment indicated a significant releasing trend of active P and DGT-labile P from the solid phase, pore water to the overlying water after disturbances due to resuspended releasing, particle size and amorphous Fe, Mn and Al's redistribution. Moreover,

Indexed as

Competitive coordinationDisturbanceLong-term immobilizationSedimentSize effect

Identifiers

PMID39559551

DOI10.1016/j.wroa.2024.100272

PMCPMC11570968

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