Iron Infused Cajanus Cajan Leaf-Based Novel Bioadsorbent for Fluoride Adsorption from Water: Isotherm, Kinetic and Mechanisms

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Water, Air, & Soil Pollution Pub Date : 2025-01-28 DOI:10.1007/s11270-025-07775-9

Naveen Patel, Santanu Mallik, Saurabh Kumar, Brijesh Kumar Yadav, Akansha Patel, Vinod Kumar Chaudhary, Arun Lal Srivastav

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Abstract

Agro-waste biomass of Cajanus cajan leaves were used for the synthesis of bioadsorbent iron activated pigeon pea leave (Fe-ACP) at 500 °C in muffle furnace and used for the abatement of fluoride from water. Characterization of bioadsorbent was done by using pH_PZC, Scanning Electron Microscopy, Energy-dispersive X-ray, X-Ray Diffraction, and Fourier Transform Infrared Spectroscopy. Study was also conducted by varying the adsorbent doses, initial concentrations of fluoride, contact time intervals, pH of solution, temperature of the solution and in presence different competing ions. The result clearly indicated that at optimum adsorbent dose of 3 g/L the maximum removal of fluoride was achieved within 150 min of contact time. The fluoride removal efficiency got increased with increase in temperature from 25 °C to 55 °C. The Langmuir isotherm (R²= 0.997) and pseudo-second-order kinetic model (R²= 0.991) were found to be the best fit model to explain the mechanism of fluoride adsorption on Fe-ACP. The adsorption process was observed to be endothermic and spontaneous in nature as evidenced by thermodynamics studies. Through ANOVA analysis, the significant influence (p < 0.001) of contact time, biochar dose, initial fluoride concentrations, pH, and temperature were observed on the fluoride adsorption process. Presence of similar charge of competing ions (nitrate and phosphate) significantly impacted on the efficiency of Fe-ACP bioadsorbent for fluoride adsorption. Regeneration studies showed that Fe-ACP bio-adsorbent can be utilized up to four cycles. The experimental results proved that the Fe-ACP bio-adsorbent has excellent ability to reduce the level of fluoride from water up to 4 cycles after regeneration.

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铁注入柴豆叶新型生物吸附剂对水中氟化物的吸附：等温线、动力学及机理

以柴豆叶的农业废弃物生物质为原料，在500℃的马弗炉中合成铁活性生物吸附剂鸽子豆叶（Fe-ACP），并用于水中除氟。利用pHPZC、扫描电镜、能量色散x射线、x射线衍射和傅里叶变换红外光谱对生物吸附剂进行了表征。通过改变吸附剂剂量、氟化物初始浓度、接触时间间隔、溶液pH值、溶液温度和不同竞争离子的存在，进行了研究。结果清楚地表明，当吸附剂的最佳剂量为3 g/L时，在接触时间150 min内可达到最大的除氟效果。在25℃~ 55℃范围内，除氟效率随温度的升高而提高。Langmuir等温线（R2 = 0.997）和拟二级动力学模型（R2 = 0.991）最适合解释Fe-ACP吸附氟的机理。热力学研究表明，吸附过程是吸热自发的。通过方差分析，观察到接触时间、生物炭剂量、初始氟浓度、pH和温度对氟吸附过程的显著影响（p < 0.001）。具有相似电荷的竞争离子（硝酸盐和磷酸盐）的存在显著影响了Fe-ACP生物吸附剂对氟的吸附效率。再生研究表明，Fe-ACP生物吸附剂可循环使用4次。实验结果表明，Fe-ACP生物吸附剂对再生后4次循环的水中氟化物具有良好的降低能力。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.