Preparation and application of novel rice husk biochar-calcite composites for phosphate removal from aqueous medium

文献类型： 外文期刊

第一作者： Ramola, Sudipta

作者： Ramola, Sudipta;Li, Cun Jun;Zhou, Chun Hui;Ramola, Sudipta;Liu, Yu Xue;Wang, Yu Ying;Yang, Sheng Mao;Ramola, Sudipta;Liu, Yu Xue;Wang, Yu Ying;Yang, Sheng Mao;Belwal, Tarun;Zhou, Chun Hui

作者机构：

关键词： Rice husk biochar; Calcite; Composite; Phosphate removal; Adsorption isotherm; Kinetic model

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）

ISSN： 0959-6526

年卷期： 2021 年 299 卷

页码：

收录情况： SCI

摘要： Excessive phosphorus (P) in water bodies causes eutrophication, which threatens the health of the environment. In the present study, a novel rice husk biochar-calcite composite (BRH-C) was prepared. The pyrolysis conditions and phosphate removal processes were optimized using central composite design. The optimized pyrolysis conditions for the preparation of BRH-C were as follows: a pyrolysis temperature of 700 degrees C, pyrolysis time of 2.3 h, and rice husk-calcite (RH-C) ratio of 4.2:1 (w/w). The maximum removal and adsorption capacities of optimized BRH-C were 87.3% and 1.76 mg/g, respectively, at low phosphate concentrations. The pyrolysis temperature had positive linear and quadratic effects on the phosphate removal, whereas the pyrolysis time had a negative quadratic effect. The RH-C ratio had a positive quadratic effect. The maximum phosphate removal (54.2%) and adsorption capacity (10.72 mg/g) were achieved at phosphate concentration of 95 mg/L, 0.24 g of BRH-C, pH 5.4, and contact time of 11.75 h. Phosphate removal by BRH-C was maximum at lower concentrations (10-25 mg/L), whereas phosphate removal by calcite was maximum at higher concentrations (75-125 mg/L). Calcite altered the yield and textural properties of BRH-C and imparted characteristics calcite functional groups and minerals to BRH-C. Freundlich adsorption isotherm and second-order kinetic model suggested heterogeneous and multilayer chemisorption of phosphate onto both BRH-C and calcite. Presence of NaCl, NaNO3, KCl, and NaHCO3 in solution reduced the amount of phosphate removal by BRH-C. Promising results for phosphate removal were achieved only for up to two cycles of BRH-C regeneration. BRH-C is a cost-effective and ecofriendly adsorbent prepared from rice husk and calcite, with no need for sophisticated instruments or chemicals. It was developed as an optimized adsorbent for the efficient removal of phosphate at low concentrations. (C) 2021 Elsevier Ltd. All rights reserved.

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