Abstract
Phosphorus (P) pollution and phosphorus recovery are important issues in the field of environmental science. In this work, a novel Al-Ti bimetal composite sorbent was developed via a cost-effective co-precipitation approach for P removal from water. The adsorptive performance and characteristics of P onto Al-Ti sorbent were evaluated by batch adsorption experiments. The effects of Al:Ti molar ratio, initial P concentration and reaction temperature were investigated. The microstructural characteristics of the Al-Ti sorbent were confirmed by scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, and nitrogen adsorption-desorption measurements. Kinetic studies showed that the adsorption of P on Al-Ti oxide proceeds according to pseudo-second-order kinetics. The maximum adsorption capacity of phosphate on the Al-Ti oxide calculated from linear Langmuir models was 68.2 mg-P/g at pH 6.8. The Al-Ti oxide composite sorbent showed good potential for P recovery, owing to its large adsorption capacity and ease of regeneration.
Highlights
Received: 9 December 2021Phosphorus (P) is a vital macronutrient that promotes the growth and development of living organisms
Pernicious eutrophication and algae bloom of receiving waters, such as rivers, reservoirs, lakes, and coastal waters have become worldwide environmental problems, characterized by the rapid growth of cyanobacteria and algae that consume a considerable amount of dissolved oxygen and cause the subsequent death of aquatic life [2]
Al2 (SO4 )3 ·8H2 O (≥99.0%, Tianjin Chemical Reagent Co., Ltd., China) and Ti(SO4 )2 (≥96.0%, Beijing, Sinopharm Chemical Reagent Co., Ltd., China) with 1 mol/L total metal concentration were dissolved in 200 mL of deionized water
Summary
Phosphorus (P) is a vital macronutrient that promotes the growth and development of living organisms. The rapidly burgeoning human population has led to a rising demand for high agricultural and industrial productivity, which, inevitably, has led to an exponential increase in the consumption of fertilizer and detergent. Since P is present in several minerals and rocks, it is a fundamentally non-renewable resource. The most accessible high-grade P in rocks and minerals is being exhausted. Over the 50–100 years, P in rock reserves worldwide are expected to become depleted [1]. Pernicious eutrophication and algae bloom of receiving waters, such as rivers, reservoirs, lakes, and coastal waters have become worldwide environmental problems, characterized by the rapid growth of cyanobacteria and algae that consume a considerable amount of dissolved oxygen and cause the subsequent death of aquatic life [2]
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