Recovery of Phosphate From Aqueous Solution by Mg/Ca-Modified Biochar Derived From Dewatered Dry Sludge and Waste Almond Shells and Its Potential Application
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引用次数: 0
Abstract
Phosphorus is an essential element of ecosystems, supporting the growth of plants and animals; however, its excessive presence in water can lead to eutrophication. In this study, the phosphate adsorbent SA2:8 Mg/Ca was prepared by loading calcium and magnesium onto sludge and almond shell. Various characterization methods were used to analyze biochar, and the phosphorus removal effect of SA2:8 Mg/Ca under different conditions was evaluated. The results showed that the phosphate removal rate of the adsorbent was more than 70% in the range of pH 4 ~ 12, and the adsorption performance was significantly affected by HCO3− and SO42−, though the removal rate remained over 50%. The adsorption process conforms to the pseudo-second-order model, and the isothermal adsorption model aligns more closely with the Langmuir model. Increased temperature was favorable for phosphate adsorption. The theoretical maximum adsorption capacity of SA2:8 Mg/Ca was 78.27 mg/g. Thermodynamic analysis confirmed that the adsorption process was spontaneous. The main mechanisms of adsorption include electrostatic interaction, ion exchange, Lewis acid–base interaction, and chemical precipitation. Additionally, the P-laden biochar exhibited excellent potential for application: it can be used as a catalyst to improve the efficiency of persulfate catalytic degradation of ofloxacin. The removal rate of OFX in water by the SA2:8 Mg/Ca-PS system was 81.4%.
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.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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