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Caption : fig. s1 (a) uv-vis curves of the pd-try-gqd-npc+tmb system over time. (b) the relationship curve between the absorbance value and reaction time.

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Caption : fig. s2 (a) uv-vis absorption spectra of pd-try-gqd-npc+tmb in air, o2, and n2-saturated solutions. (b) effect of different scavenger on system catalytic activity.

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Caption : fig. s3 epr spectra of o2•− (a) and 1o2 (b) trapped by dmpo and temp.

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Caption : fig. s4 uv absorption curves of the blank solution (a) and the 0.11 µm nitrite sample (b).

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Caption : fig. s5 selectivity of pd-try-gqd-npc+tmb system for nitrite over other potentially interfering substances (na+, k+, mg2+, cu2+, ca2+, cl-, co32-, po43-, so42-, and glucose).