Encapsulation of essential oils in porous silica and MOFs for trichloroisocyanuric acid tablets used for water treatment in swimming pools

• Trichloroisocyanuric acid (TCCA) tablets for water treatment in swimming pools.
• Encapsulation of insect repellents in silica and MOFs MIL-53(Al) and MIL-88A(Al).
• Repellents were geranic acid, citronellic acid, geraniol and IR3535®.
• Inclusion in TCCA tablets of encapsulated insect repellents.
• TCCA with encapsulated repellents produced stable multifunctional tablets.

Trichloroisocyanuric acid (TCCA) tablets are used for water treatment in swimming pools. This is a safe way of releasing hypochlorous acid with disinfectant, algaecide and bactericide functions. This work investigates the inclusion in such tablets of insect repellents (geranic acid, citronellic acid, geraniol and IR3535®) with a simultaneous perfume function. A simple mixture of TCCA with the repellents is not possible due to the incompatibility between both components. A strategy of encapsulation in silica and MOFs MIL-53(Al) and MIL-88A(Al) has been developed. The subsequent formulation of TCCA with the encapsulated repellents avoided the compatibility problems and produced marketable stable multifunctional (water treatment–insect repellency–perfume) tablets for water treatment.

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